CN201769264U - Device for preparing steel fiber reinforced cement-based materials in one-way distribution - Google Patents
Device for preparing steel fiber reinforced cement-based materials in one-way distribution Download PDFInfo
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- CN201769264U CN201769264U CN2010202697807U CN201020269780U CN201769264U CN 201769264 U CN201769264 U CN 201769264U CN 2010202697807 U CN2010202697807 U CN 2010202697807U CN 201020269780 U CN201020269780 U CN 201020269780U CN 201769264 U CN201769264 U CN 201769264U
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Abstract
The utility model relates to a device for preparing steel fiber reinforced cement-based materials in one-way distribution. The device comprises a vibration table, a coil and a direct-current power source, wherein the vibration table has no magnetic absorption. The amplitude of the vibration table is 0.5+/- 0.2mm; the vibration frequency of the vibration table is 2850 times per minute; the coil has 100-3000 turns; and the length of the coil ranges from 100mm to 550mm. The shape and the size of a cavity in a framework of the device are defined by the shape and the size of a nonmetal test mold with cast steel fiber cement-based material mixture, wherein the nonmetal test mold is placed into the cavity. When connection voltage ranges from 1 volt to 30 volts and current ranges from 0.1 ampere to 20 amperes, magnetic field with magnetic induction ranging from 1.0*10-3T to 20.0*10-3T can be generated in a cavity of the coil. Compared with steel fiber reinforced cement-based materials prepared by an existing method, rupture strength of the steel fiber reinforced cement-based materials in one-way distribution prepared by the device are improved by 20% to 100%, or steel fibers can be saved by 25% to 60%.
Description
Technical field
The technical solution of the utility model relates to the steel fiber reinforced cement sill, specifically prepares the equipment of unidirectionally-distributed steel fiber reinforced cement sill.
Background technology
Cement-based material (comprising concrete, mortar and cement mortar etc.) is most widely used general in the architectural engineerings such as building, traffic and water conservancy, one of topmost engineering material.The characteristics of cement-based material are the compression strength height, tensile strength is low, limiting strain is little and fragility is big.Because these characteristics cause cement-based material poor toughness and easy to crack.The reinforcing bar at place, crack, cracking back can not get effective protection of cement-based material, and corrosion may take place too early, and structure durability descends, and this becomes one of main factor that influences construction quality and engineering service life.The admixture steel fibre is to improve cement-based material crack resistance and toughness, improves one of most effectual way of tensile property.In the cement-based material after the admixture steel fibre, the steel fibre consistent with the tension direction can effectively be shared tension, and for the crack that has produced, the steel fibre of crossing over the both sides, crack can stop further developing of crack, reduce the width in crack, thus the crack resistance of water lift cement-based material.But wherein the effect that improves the cement-based material crack resistance with the not quite identical steel fibre of tension direction descends the crack resistance almost not effect of the steel fibre vertical with the tension direction to improving cement-based material along with departing from of direction.
The preparation technology of existing steel fiber reinforced cement sill is, raw material such as cement and steel fibre are mixed together, and adds mixing water to stir, and goes into the mould vibration compacting, and sclerosis becomes engineering material.According to the steel fiber reinforced cement sill of this technological forming, steel fibre is random at random distribution in cement-based material.Cement-based material in the actual engineering is subjected to the action direction difference of specific load according to the position difference, the long-term pressurized of a part of often cement-based material and the long-term tension of another part cement-based material, and stress direction generally can not change.Therefore, adopt existing technology to prepare the unidirectionally-distributed steel fiber reinforced cement sill, have only the fraction steel fibre consistent or approaching to bring into play the effect of cracking resistance with the tension direction.On the other hand, effectively the distribution density of steel fibre must reach really cracking resistance of certain value, generally adopt the method that improves the whole volume of steel fibre hereto in the solution engineering of problem, even make at random disorderly to distribution, steel fibre along the tension direction still has sufficient amount, can bear corresponding load, the performance of cement-based material is improved, the shortcoming of doing like this is, effective utilization ratio of the steel fibre in the cement-based material is very low, very most of steel fibre can not be brought into play due effect, also causes the cost of raw material of steel fiber reinforced cement sill to increase considerably simultaneously.
The utility model content
Technical problem to be solved in the utility model is: the equipment that preparation unidirectionally-distributed steel fiber reinforced cement sill is provided, the unidirectionally-distributed steel fiber reinforced cement sill of preparing with this equipment, its rupture strength improves 20%～100% than the steel fiber reinforced cement sill with existing method preparation, or saves steel fibre 25%～60%.
The utility model solves this technical problem the technical scheme that is adopted:
The equipment of preparation unidirectionally-distributed steel fiber reinforced cement sill is made of shake table, coil and dc source.
The equipment of above-mentioned preparation unidirectionally-distributed steel fiber reinforced cement sill, described shake table is mechanical type concrete vibrating stand, mechanical type mortar shake table or mechanical cement slurry shake table, wherein the mechanical type concrete vibrating stand does not have magnetic force absorption, its amplitude is 0.5 ± 0.2mm, vibration frequency is 2850 times/minute, meets " concrete test shake table " (JGT 3020-94) regulation or other industry relevant criterion; Mechanical type mortar shake table does not have magnetic force absorption, and its amplitude is 0.5 ± 0.2mm, and vibration frequency is 2850 times/minute, meets " cement physical test instrument glue sand shake table " and (JCT723-2005) stipulates or other industry relevant criterion; The mechanical cement slurry shake table does not have magnetic force absorption, and its amplitude is 0.5 ± 0.2mm, and vibration frequency is 2850 times/minute, meets " cement physical test instrument glue sand shake table " and (JCT723-2005) stipulates or other industry relevant criterion.
The equipment of above-mentioned preparation unidirectionally-distributed steel fiber reinforced cement sill, the number of turn of described coil is 100～3000 circles, length is 100～550mm, cavity shape in its skeleton and size are determined according to shape that is placed into the nonmetal die trial that has poured into the steel fiber reinforced concrete mixture wherein and size, the nonmetal die trial that permission will pour into steel fiber feinforced cement sill mixture is placed in one, connecting voltage is 1～30 volt and electric current when being the direct current of 0.1～20 peace, can generation magnetic induction intensity be 1.0 * 10 in the cavity of this coil
-3T～20.0 * 10
-3The magnetic field of T.
It is 0～20 peace with DC current that the equipment of above-mentioned preparation unidirectionally-distributed steel fiber reinforced cement sill, described dc source can provide the DC voltage of output to be 0～30 volt.
The equipment of above-mentioned preparation unidirectionally-distributed steel fiber reinforced cement sill, described dc source, coil and shake table all are present technique field equipment commonly used, are that those skilled in the art of the present technique can self manufacture or be available commercially.
The method that the equipment of above-mentioned preparation unidirectionally-distributed steel fiber reinforced cement sill is used to prepare the unidirectionally-distributed steel fiber reinforced cement sill is as follows:
The first step, preparation steel fiber feinforced cement sill mixture
The match ratio of forming component by the determined steel fiber feinforced cement sill of known method for designing, the ordinary cement sill raw material and the steel fibre of aequum when taking by weighing practical operation, dropping in the mixer ordinary cement sill raw material that takes by weighing and steel fibre evenly, mix is mixed with steel fiber feinforced cement sill mixture;
In second step, pour into die trial
The steel fiber feinforced cement sill mixture that the first step is mixed with pours in the nonmetal die trial;
In the 3rd step, apply magnetic field
The nonmetal die trial that has poured into the steel fiber feinforced cement sill mixture that the first step is mixed with that second step was obtained places in the skeleton cavity of coil of equipment of preparation unidirectionally-distributed steel fiber reinforced cement sill, again this coil and die trial are placed on the shake table of the said equipment together, the dc source of opening the said equipment makes coil electricity form magnetic field, apply magnetic field with the steel fiber feinforced cement sill mixture that the first step is mixed with, tension direction when magnetic direction and test specimen test or duty is consistent, and above-mentioned coil intrinsic inductance is 1.0 * 10
-3T～20.0 * 10
-3T, the shake table of opening the said equipment vibrates 30～300 seconds, close the shake table of the said equipment then in order successively, cut off the dc source of above-mentioned coil, and the nonmetal die trial that will pour into the steel fiber feinforced cement sill mixture that the first step is mixed with shifts out the skeleton cavity of this coil, is positioned on ground or the experimental bench;
The 4th step, form removal and maintenance
It is floating gently that the 3rd step was applied the steel fiber feinforced cement sill mixture test specimen surface in nonmetal die trial that obtains behind the magnetic field, leaves standstill, and form removal obtains the unidirectionally-distributed steel fiber reinforced cement sill after the maintenance.
The equipment of above-mentioned preparation unidirectionally-distributed steel fiber reinforced cement sill, specifically, be the preparation unidirectionally-distributed steel fiber reinforced concrete equipment, be the preparation unidirectional distributive steel fiber reinforced mortar equipment or the preparation unidirectionally-distributed steel fiber reinforced cement paste equipment.
The equipment of above-mentioned preparation unidirectionally-distributed steel fiber reinforced cement sill is used to prepare the method for unidirectionally-distributed steel fiber reinforced cement sill, specifically, be the method for preparing unidirectionally-distributed steel fiber reinforced concrete, be the method for preparing the method for unidirectional distributive steel fiber reinforced mortar or prepare unidirectionally-distributed steel fiber reinforced cement paste.
The beneficial effects of the utility model are:
(1) principle
Steel fiber feinforced cement sill mixture is applied magnetic field, utilize fibrous steel in high-intensity magnetic field, can be magnetized, when machine direction and magnetic direction out of plumb, form the characteristic of the magnetic S utmost point and the magnetic N utmost point respectively at the fiber two ends, apply the external magnetic field steel fibre in the cement-based material mixture is magnetized into the small magnet that two ends are the two poles of the earth, and then under the directional magnetic field effect, the be magnetized two ends of steel fibre are subjected to the active force of opposite sign but equal magnitude respectively, when being in liquefaction in the cement-based material mixture vibration processes, steel fibre wherein can rotate under the active force effect of magnetic field, it is consistent with magnetic direction that direction is tending towards, thereby form unidirectional or directional profile.This shows, the method and apparatus that the present invention prepares the unidirectionally-distributed steel fiber reinforced cement sill has overcome the steel fiber reinforced cement sill of prior art processes moulding fully, steel fibre is random at random distribution in cement-based material, effective utilization ratio of the steel fibre in the cement-based material is very low, very most of steel fibre can not be brought into play due effect, the shortcoming that while also causes the cost of raw material of steel fiber reinforced cement sill to increase considerably has outstanding substantial characteristics.
(2) practice
The inventor develops the equipment of preparation unidirectionally-distributed steel fiber reinforced cement sill through big quantity research.According to the size and shape of newly mixing cement-based material workability and steel fibre, adjust the electric current and voltage of dc source, in the application process with the magnetic induction intensity in the control coil inner space.Facts have proved that steel fiber feinforced cement sill mixture workability is good more, required magnetic field magnetic induction intensity is more little, otherwise the mixture workability is poor more, then need increase electric current, improves magnetic field magnetic induction intensity.
(3) effect
Compare with the steel fiber feinforced cement sill that adopts the art methods preparation: if raw materials used match ratio is identical, the rupture strength of the unidirectional distributive steel fiber cement-based material for preparing with the inventive method and equipment has improved 20%～100%; Identical as the fruit product rupture strength, prepare the unidirectional distributive steel fiber cement-based material with the inventive method and equipment, wherein the steel fibre consumption reduces by 25%～60%, this shows that compared with the prior art the present invention has obvious improvement.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the structural representation that the utility model prepares the equipment of unidirectionally-distributed steel fiber reinforced cement sill.
Fig. 2 is the dc source schematic diagram of the utility model equipment of preparing the unidirectionally-distributed steel fiber reinforced cement sill.
Fig. 3 is the coil schematic diagram of the utility model equipment of preparing the unidirectionally-distributed steel fiber reinforced cement sill.
Fig. 4 is the coil section schematic diagram of the utility model equipment of preparing the unidirectionally-distributed steel fiber reinforced cement sill.
Fig. 5 is the shake table schematic diagram of the utility model equipment of preparing the unidirectionally-distributed steel fiber reinforced cement sill.
Among the figure, 1. dc source, 2. coil, 3. shake table, 4. Current Control knob, 5. switch.
The specific embodiment
Embodiment illustrated in fig. 1 showing, the equipment that the utility model prepares the unidirectionally-distributed steel fiber reinforced cement sill is made of dc source 1, coil 2 and shake table 3, wherein dc source 1 has alternating current (AC) input and DC output end, DC output end is connected to coil 2, whether switch 5 control of dc source 1 for coil 2 provides direct current, is controlled to be the size that coil 2 provides galvanic voltage and current with the Current Control knob 4 of dc source 1; Coil 2 is placed on the shake table 3.
Embodiment illustrated in fig. 2 showing, the dc source 1 that the utility model prepares the equipment of unidirectionally-distributed steel fiber reinforced cement sill is provided with alternating current (AC) input, DC output end, switch 5 and Current Control knob 4.
Embodiment illustrated in fig. 3 showing, the utility model prepares the coil 2 of the equipment of unidirectionally-distributed steel fiber reinforced cement sill, its number of turn is 100～3000 circles, and length l is 100～550mm, guarantees to be longer than the length of the nonmetal die trial in the skeleton cavity that places coil.Coil 2 is connected on the DC output end (DC) of dc source 1.
Embodiment illustrated in fig. 4 showing, the utility model prepares the coil 2 of the equipment of unidirectionally-distributed steel fiber reinforced cement sill, and wherein cavity cross section is square, and size is decided according to the die trial of being inserted.
Embodiment illustrated in fig. 5 showing, the utility model prepares the shake table 3 of the equipment of unidirectionally-distributed steel fiber reinforced cement sill, and its size is can place coil and die trial is as the criterion.
The first step, preparation steel fiber reinforced concrete mixture
The quality mixture ratio of forming component by the concrete that by the determined strength grade of known method for designing is C40 is than being water: cement: flyash: sand: stone: high efficiency water reducing agent: steel fibre=180: 375: 75: 780: 990: 2.2: the water of 47 weighing aequums, cement, flyash, sand, stone, high efficiency water reducing agent and steel fibre, used steel fibre is that low-carbon steel material adopts Cutting Process to make, diameter 0.5mm, draw ratio is 40.Load weighted cement, flyash, sand, stone are dropped into the mixer siccative and stirs, drop into whole load weighted steel fibres then while stirring to stirring, add load weighted mixing water and high efficiency water reducing agent again, continue to stir 90 seconds, the concrete mix slump is 160mm;
In second step, pour into die trial
The steel fiber reinforced concrete mixture that the first step is mixed with pours in the nonmetal die trial of 100mm * 100mm * 400mm;
In the 3rd step, apply magnetic field
The nonmetal die trial that has poured into the steel fiber reinforced concrete mixture that the first step is mixed with that second step was obtained places in the skeleton cavity of coil of equipment of preparation unidirectionally-distributed steel fiber reinforced concrete, again this coil and die trial are placed on the shake table of the said equipment together, the dc source of opening the said equipment makes coil electricity form magnetic field, apply magnetic field with the steel fiber reinforced concrete mixture that the first step is mixed with, tension direction when magnetic direction and test specimen test or duty is consistent or determines that according to designing requirement above-mentioned coil intrinsic inductance is 3.0 * 10
-3T, the shake table of opening the said equipment vibrates 90 seconds, close the shake table of the said equipment then in order successively, cut off the dc source of above-mentioned coil, and the nonmetal die trial that will pour into the steel fiber reinforced concrete mixture that the first step is mixed with shifts out the skeleton cavity of this coil, is positioned on ground or the experimental bench;
The 4th step, form removal and maintenance
The 3rd step was applied the floating gently indoor environment that is placed in steel fiber reinforced concrete mixture test specimen surface in nonmetal die trial that obtains behind the magnetic field, the surface coverage plastic sheeting, form removal after 24 hours, move into the fog room maintenance, keeping temperature is 20+2 ℃, relative humidity 〉=90%, the maintenance extremely 28d of regulation was taken out test specimen during the length of time from fog room, obtain unidirectionally-distributed steel fiber reinforced concrete, recording its rupture strength according to GBJ 81-1985 " normal concrete mechanical test method " is 8.70MPa.
The comparative example 1
The 3rd step in lacking embodiment 1, other technologies are identical with embodiment 1.
The same maintenance extremely 28d of regulation was taken out test specimen during the length of time from fog room, obtain the steel fiber reinforced concrete of non-unidirectional distribution, and recording its rupture strength according to GBJ 81-1985 " normal concrete mechanical test method " is 6.95MPa.
The first step, preparation steel fiber reinforced concrete mixture
The quality mixture ratio of forming component by the concrete that by the determined strength grade of known method for designing is C55 is a water: cement: flyash: sand: stone: high efficiency water reducing agent: steel fibre=170: 385: 95: 775: 980: 3.0: the water of 117 weighing aequums, cement, flyash, sand, stone, high efficiency water reducing agent and steel fibre, used steel fibre is that low-carbon steel material adopts Cutting Process to make, diameter 0.5mm, draw ratio is 40.Load weighted cement, flyash, sand, stone are dropped into the mixer siccative and stirs, drop into whole load weighted steel fibres then while stirring to stirring, add load weighted mixing water and high efficiency water reducing agent again, continue to stir 300 seconds, the concrete mix slump is 40mm;
In second step, pour into die trial
The steel fiber reinforced concrete mixture that the first step is mixed with pours in the nonmetal die trial of 100mm * 100mm * 400mm;
In the 3rd step, apply magnetic field
The nonmetal die trial that has poured into the steel fiber reinforced concrete mixture that the first step is mixed with that second step was obtained places in the skeleton cavity of coil of equipment of preparation unidirectionally-distributed steel fiber reinforced concrete, again this coil and die trial are placed on the shake table of the said equipment together, the dc source of opening the said equipment makes coil electricity form magnetic field, apply magnetic field with the steel fiber reinforced concrete mixture that the first step is mixed with, tension direction when magnetic direction and test specimen test or duty is consistent or determines that according to designing requirement above-mentioned coil intrinsic inductance is 12.0 * 10
-3T, the shake table of opening the said equipment vibrates 180 seconds, close the shake table of the said equipment then in order successively, cut off the dc source of above-mentioned coil, and the nonmetal die trial that will pour into the steel fiber reinforced concrete mixture that the first step is mixed with shifts out the skeleton cavity of this coil, is positioned on ground or the experimental bench;
The 4th step, form removal and maintenance
The 3rd step was applied the floating gently indoor environment that is placed in steel fiber reinforced concrete mixture test specimen surface in nonmetal die trial that obtains behind the magnetic field, the surface coverage plastic sheeting, form removal after 24 hours, move into the fog room maintenance, keeping temperature is 20 ± 2 ℃, relative humidity 〉=90%, the maintenance extremely 28d of regulation was taken out test specimen during the length of time from fog room, obtain unidirectionally-distributed steel fiber reinforced concrete, recording its rupture strength according to GBJ 81-1985 " normal concrete mechanical test method " is 20.4MPa.
The comparative example 2
The 3rd step in lacking embodiment 2, other technologies are identical with embodiment 2.
The same maintenance extremely 28d of regulation was taken out test specimen during the length of time from fog room, obtain the steel fiber reinforced concrete of non-unidirectional distribution, and recording its rupture strength according to GBJ 81-1985 " normal concrete mechanical test method " is 11.2MPa.
The first step, preparation steel fiber reinforced concrete mixture
By the determined strength grade of known method for designing is that the quality mixture ratio that the concrete of C45 is formed component is a water: cement: flyash: sand: stone: high efficiency water reducing agent: steel fibre=165: 430: 0: 815: 970: 3.2: the water of 47 weighing aequums, cement, flyash, sand, stone, high efficiency water reducing agent and steel fibre, used steel fibre is that low-carbon steel material adopts Cutting Process to make, diameter 0.5mm, draw ratio is 40.Load weighted cement, flyash, sand, stone are dropped into the mixer siccative and stirs, drop into whole load weighted steel fibres then while stirring to stirring, add load weighted mixing water and high efficiency water reducing agent again, continue to stir 180 seconds, the concrete mix slump is 135mm;
In second step, pour into die trial
The steel fiber reinforced concrete mixture that the first step is mixed with pours in the nonmetal die trial of 100mm * 100mm * 400mm;
In the 3rd step, apply magnetic field
The nonmetal die trial that has poured into the steel fiber reinforced concrete mixture that the first step is mixed with that second step was obtained places in the skeleton cavity of coil of equipment of preparation unidirectionally-distributed steel fiber reinforced concrete, again this coil and die trial are placed on the shake table of the said equipment together, the dc source of opening the said equipment makes coil electricity form magnetic field, apply magnetic field with the steel fiber reinforced concrete mixture that the first step is mixed with, tension direction when magnetic direction and test specimen test or duty is consistent or determines that according to designing requirement above-mentioned coil intrinsic inductance is 10.0 * 10
-3T, the shake table of opening the said equipment vibrates 240 seconds, close the shake table of the said equipment then in order successively, cut off the dc source of above-mentioned coil, and the nonmetal die trial that will pour into the steel fiber reinforced concrete mixture that the first step is mixed with shifts out the skeleton cavity of this coil, is positioned on ground or the experimental bench;
The 4th step, form removal and maintenance
The 3rd step was applied the floating gently indoor environment that is placed in steel fiber reinforced concrete mixture test specimen surface in nonmetal die trial that obtains behind the magnetic field, the surface coverage plastic sheeting, form removal after 24 hours, move into the fog room maintenance, keeping temperature is 20+1 ℃, relative humidity 〉=95%, the maintenance extremely 28d of regulation was taken out test specimen during the length of time from fog room, obtain unidirectionally-distributed steel fiber reinforced concrete, recording its rupture strength according to GBJ 81-1985 " normal concrete mechanical test method " is 9.7MPa.
The comparative example 3
Definite quality ratio raw materials used in the first step is: water: cement: flyash: sand: stone: high efficiency water reducing agent: steel fibre=165: 430: 0: 805: 940: 3.2: 117 and lack the 3rd among the embodiment 3 step, and other technologies are identical with embodiment 3.
The same maintenance extremely 28d of regulation was taken out test specimen during the length of time from fog room, obtain the steel fiber reinforced concrete of non-unidirectional distribution, and recording its rupture strength according to GBJ 81-1985 " normal concrete mechanical test method " is 9.6MPa.
In the foregoing description 1～3: the number of turn of the coil of the equipment of used preparation unidirectionally-distributed steel fiber reinforced concrete is selected in 300～1000 circles and length l are the scope of 100～550mm, with the length that guarantees to be longer than the nonmetal die trial in the skeleton cavity that places coil, cavity shape in its skeleton and size determine that according to shape that is placed into the nonmetal die trial that has poured into the steel fiber reinforced concrete mixture wherein and size the nonmetal die trial that permission will pour into the steel fiber reinforced concrete mixture is placed in one; The shake table of the equipment of described preparation unidirectionally-distributed steel fiber reinforced concrete is the mechanical type concrete vibrating stand, no magnetic force absorption, its amplitude is 0.5 ± 0.2mm, vibration frequency is 2850 times/minute, meets " concrete test shake table " (JGT 3020-94) regulation or other industry relevant criterion.
The first step, preparation steel fibre mortar mixture
By the determined strength grade of known method for designing is that the quality mixture ratio that the mortar of M5 is formed component is a water: cement: sand: high efficiency water reducing agent=0.56: 1: 3: 0.003, the water of aequum when taking by weighing practical operation: cement and sand, (density of steel, cement, water is respectively 7800kg/m to be taken at admixture volume volume in the ordinary mortar again and to be 1.5% steel fibre
3, 3100kg/m
3, 1000kg/m
3, can determine required steel fibre quality in view of the above), used steel fibre is a steel wire cut-off type steel fibre, and length is 13mm, and draw ratio is 40.After earlier load weighted cement and sand being dropped into the mortar mixer siccative and stirring, drop into load weighted steel fibre while stirring, right load weighted mixing water and the high efficiency water reducing agent of adding continues to stir discharging after 60 seconds, and the denseness of measuring steel fibre mortar mixture is 120mm;
In second step, pour into die trial
The steel fibre mortar mixture that the first step is mixed with pours in the nonmetal die trial of 40mm * 40mm * 160mm;
In the 3rd step, apply magnetic field
The nonmetal die trial that has poured into the steel fibre mortar mixture that the first step is mixed with that second step was obtained places in the skeleton cavity of coil of equipment of preparation unidirectional distributive steel fiber reinforced mortar, again this coil and die trial are placed on the shake table of the said equipment together, the dc source of opening the said equipment makes coil electricity form magnetic field, apply magnetic field with the steel fibre mortar mixture that the first step is mixed with, tension direction when magnetic direction and test specimen test or duty is consistent or determines that according to designing requirement above-mentioned coil intrinsic inductance is 1.0 * 10
-3T, the shake table of opening the said equipment vibrates 30 seconds, close the shake table of the said equipment then in order successively, cut off the dc source of above-mentioned coil, and the nonmetal die trial that will pour into the steel fibre mortar mixture that the first step is mixed with shifts out the skeleton cavity of this coil, is positioned on ground or the experimental bench;
The 4th step, form removal and maintenance
The 3rd step was applied the floating gently indoor environment that is placed in steel fibre mortar mixture test specimen surface in nonmetal die trial that obtains behind the magnetic field, the surface coverage plastic sheeting, form removal after 24 hours, move into the fog room maintenance, keeping temperature is 20+2 ℃, relative humidity 〉=90%, and the maintenance extremely 28d of regulation was taken out test specimen during the length of time from fog room, obtain unidirectional distributive steel fiber reinforced mortar, recording its rupture strength according to GB/T 17671 " Test method for strength of hydraulic cement mortar " is 7.65MPa.
The comparative example 4
The 3rd step in lacking embodiment 4, other technologies are identical with embodiment 4.
The same maintenance extremely 28d of regulation was taken out test specimen during the length of time from fog room, obtain the steel fiber reinforced mortar of non-unidirectional distribution, and recording its rupture strength according to GB/T 17671 " Test method for strength of hydraulic cement mortar " is 6.10MPa.
The first step, preparation steel fibre mortar mixture
By the determined strength grade of known method for designing is that the quality mixture ratio that the mortar of M10 is formed component is a water: cement: sand: high efficiency water reducing agent=0.3: 1: 1.5: 0.006, the water of aequum when taking by weighing practical operation: cement and sand, (density of steel, cement, water is respectively 7800kg/m to be taken at admixture volume volume in the ordinary mortar again and to be 1.5% steel fibre
3, 3100kg/m
3, 1000kg/m
3, can determine required steel fibre quality in view of the above), used steel fibre is a steel wire cut-off type steel fibre, and length is 13mm, and draw ratio is 40.Earlier load weighted water is dropped into mixer, drop into load weighted cement again, open mixer and stirred 20 seconds, add load weighted sand while stirring, drop into load weighted steel fibre then while stirring, continue to stir 180 seconds, the denseness of measuring steel fibre mortar mixture is 40mm;
In second step, pour into die trial
The steel fibre mortar mixture that the first step is mixed with pours in the nonmetal die trial of 40mm * 40mm * 160mm;
In the 3rd step, apply magnetic field
The nonmetal die trial that pours into the steel fibre mortar mixture that the first step is mixed with that second step was obtained places in the skeleton cavity of coil of equipment of preparation unidirectional distributive steel fiber reinforced mortar, again this coil and die trial are placed on the shake table of the said equipment together, the dc source of opening the said equipment makes coil electricity form magnetic field, apply magnetic field with the steel fibre mortar mixture that the first step is mixed with, tension direction when magnetic direction and test specimen test or duty is consistent or determines that according to designing requirement above-mentioned coil intrinsic inductance is 10.0 * 10
-3T, the shake table of opening the said equipment vibrates 300 seconds, close the shake table of the said equipment then in order successively, cut off the dc source of above-mentioned coil, and the nonmetal die trial that will pour into the steel fibre mortar mixture that the first step is mixed with shifts out the skeleton cavity of this coil, is positioned on ground or the experimental bench;
The 4th step, form removal and maintenance
The 3rd step was applied the floating gently indoor environment that is placed in steel fibre mortar mixture test specimen surface in nonmetal die trial that obtains behind the magnetic field, the surface coverage plastic sheeting, form removal after 24 hours, move into the fog room maintenance, keeping temperature is 20 ± 2 ℃, relative humidity 〉=90%, and the maintenance extremely 28d of regulation was taken out test specimen during the length of time from fog room, obtain unidirectional distributive steel fiber reinforced mortar, recording its rupture strength according to GB/T 17671 " Test method for strength of hydraulic cement mortar " is 21.20MPa.
The comparative example 5
The 3rd step in lacking embodiment 5, other technologies are identical with embodiment 5.
The same maintenance extremely 28d of regulation was taken out test specimen during the length of time from fog room, obtain the steel fiber reinforced mortar of non-unidirectional distribution, and recording its rupture strength according to GB/T 17671 " Test method for strength of hydraulic cement mortar " is 11.15MPa.
Embodiment 6
By the determined strength grade of known method for designing is that the quality mixture ratio that the mortar of M7.5 is formed component is a water: cement: sand: high efficiency water reducing agent=0.42: 1: 2: 0.004, the water of aequum when taking by weighing practical operation: cement and sand, (density of steel, cement, water is respectively 7800kg/m to be taken at admixture volume volume in the ordinary mortar again and to be 0.5% steel fibre
3, 3100kg/m
3, 1000kg/m
3, can determine required steel fibre quality in view of the above), used steel fibre is a steel wire cut-off type steel fibre, and length is 13mm, and draw ratio is 40.Earlier load weighted water and high efficiency water reducing agent are dropped into mixer, drop into load weighted cement again, open mixer and stirred 120 seconds, add load weighted sand while stirring, drop into load weighted steel fibre then while stirring, continue to stir 300 seconds, the denseness of measuring steel fibre mortar mixture is 80mm;
In second step, pour into die trial
The steel fibre mortar mixture that the first step is mixed with pours in the nonmetal die trial of 40mm * 40mm * 160mm;
In the 3rd step, apply magnetic field
The nonmetal die trial that pours into the steel fibre mortar mixture that the first step is mixed with that second step was obtained places in the skeleton cavity of coil of equipment of preparation unidirectional distributive steel fiber reinforced mortar, again this coil and die trial are placed on the shake table of the said equipment together, the dc source of opening the said equipment makes coil electricity form magnetic field, apply magnetic field with the steel fibre mortar mixture that the first step is mixed with, tension direction when magnetic direction and test specimen test or duty is consistent or determines that according to designing requirement above-mentioned coil intrinsic inductance is 6.0 * 10
-3T, the shake table of opening the said equipment vibrates 120 seconds, close the shake table of the said equipment then in order successively, cut off the dc source of above-mentioned coil, and the nonmetal die trial that will pour into the steel fibre mortar mixture that the first step is mixed with shifts out the skeleton cavity of this coil, is positioned on ground or the experimental bench;
The 4th step, form removal and maintenance
The 3rd step was applied the floating gently indoor environment that is placed in steel fibre mortar mixture test specimen surface in nonmetal die trial that obtains behind the magnetic field, the surface coverage plastic sheeting, form removal after 24 hours, move into the fog room maintenance, keeping temperature is 20 ± 2 ℃, relative humidity 〉=90%, and the maintenance extremely 28d of regulation was taken out test specimen during the length of time from fog room, obtain unidirectional distributive steel fiber reinforced mortar, recording its rupture strength according to GB/T 17671 " Test method for strength of hydraulic cement mortar " is 9.05MPa.
The comparative example 6
Removing raw materials used in the first step is that the quality mixture ratio that the mortar of M7.5 is formed component is a water by the determined strength grade of known method for designing: cement: sand: high efficiency water reducing agent=0.42: 1: 2: 0.004, the water of aequum when taking by weighing practical operation: cement and sand, to be taken at admixture volume volume in the ordinary mortar again be 1.0% steel fibre and lack the 3rd among the embodiment 6 outside the step, and other technologies are identical with embodiment 6.
The same maintenance extremely 28d of regulation was taken out test specimen during the length of time from fog room, obtain the steel fiber reinforced mortar of non-unidirectional distribution, and recording its rupture strength according to GB/T 17671 " Test method for strength of hydraulic cement mortar " is 9.15MPa.
Embodiment 6 is the same substantially with comparative example 6 28d rupture strength, and the steel fibre consumption of the steel fiber reinforced mortar of the unidirectional distribution that embodiment 6 obtains has only half of steel fibre consumption of the steel fiber reinforced mortar of the non-unidirectional distribution that comparative example 6 obtains, and has reduced by 60%.
In the foregoing description 4～6: the number of turn of the coil of the equipment of used preparation unidirectional distributive steel fiber reinforced mortar is selected in 100～3000 circles and length l are the scope of 100～160mm, with the length that guarantees to be longer than the nonmetal die trial in the skeleton cavity that places coil, the cavity shape of its skeleton and size determine that according to shape that is placed into the nonmetal die trial that has poured into steel fibre mortar mixture wherein and size the nonmetal die trial that permission will pour into steel fibre mortar mixture is placed in one; The shake table of the equipment of described preparation unidirectional distributive steel fiber reinforced mortar is a mechanical type mortar shake table, no magnetic force absorption, its amplitude is 0.85 ± 0.05mm, vibration frequency is 2850 times/minute, meets " cement physical test instrument glue sand shake table " and (JCT723-2005) stipulates or other industry relevant criterion.
Embodiment 7
The first step, preparation steel fiber feinforced cement slurry mixture
By mass ratio is water: cement: high efficiency water reducing agent=0.60: 1: 0 composition cement mortar, the steel fibre of admixture volume volume 0.3% in this cement mortar, earlier load weighted mixing water is dropped into mixer, dropping into load weighted cement again stirred 20 seconds, under the state that keeps mixer to continue to stir, drop into load weighted steel fibre slowly then, steel fibre feeds intake and keeps in the process mixer to continue to stir, continue to stir discharging after 60 seconds after steel fibre feeds intake and finishes, the fluidity of measuring steel fiber feinforced cement slurry mixture is 180mm;
In second step, pour into die trial
The steel fiber feinforced cement slurry mixture that the first step is mixed with pours in the nonmetal die trial of 40mm * 40mm * 160mm;
In the 3rd step, apply magnetic field
The nonmetal die trial that pours into the steel fiber feinforced cement slurry mixture that the first step is mixed with that second step was obtained places in the skeleton cavity of coil of equipment of preparation unidirectionally-distributed steel fiber reinforced cement paste, the direction that coil generates magnetic field is consistent with test specimen long axis direction, again this coil and die trial are placed on the shake table of the said equipment together, the dc source of opening the said equipment makes coil electricity form magnetic field, apply magnetic field with the steel fiber feinforced cement slurry mixture that the first step is mixed with, tension direction when magnetic direction and test specimen test or duty is consistent or determines that according to designing requirement above-mentioned coil intrinsic inductance is 1.0 * 10
-3T, the shake table of opening the said equipment vibrates 30 seconds, close the shake table of the said equipment then in order successively and it is shifted out under die trial, the skeleton cavity of this coil is shifted out in the nonmetal die trial of cutting off the dc source of above-mentioned coil and will pouring into the steel fiber feinforced cement slurry mixture that the first step is mixed with;
The 4th step, form removal and maintenance
Applied the floating gently indoor environment that is placed in steel fiber feinforced cement slurry mixture test specimen surface in nonmetal die trial that obtains behind the magnetic field the 3rd step, the surface coverage plastic sheeting, form removal after 24 hours, move into the fog room maintenance, keeping temperature is 20 ± 2 ℃, relative humidity 〉=90%, and the maintenance extremely 28d of regulation was taken out test specimen during the length of time from fog room, obtain unidirectionally-distributed steel fiber reinforced cement paste, recording its rupture strength according to GB/T 17671 " Test method for strength of hydraulic cement mortar " is 6.96MPa.
The comparative example 7
The 3rd step in lacking embodiment 7, other technologies are identical with embodiment 7.
Same maintenance is taken out test specimen during the length of time to the 28d of regulation from fog room, the steel fiber reinforced cement that obtains non-unidirectional distribution is starched, and recording its rupture strength according to GB/T 17671 " Test method for strength of hydraulic cement mortar " is 5.81MPa.
Embodiment 7 is identical with the steel fibre consumption with comparative example 7 raw material proportioning, and the 28d rupture strength of the unidirectionally-distributed steel fiber reinforced cement paste that embodiment 7 obtains is compared the 28d rupture strength raising 20% of the steel fiber reinforced cement slurry of the non-unidirectional distribution that obtains than embodiment 7.
Embodiment 8
The first step, preparation steel fiber feinforced cement slurry mixture
By mass ratio is water: cement: high efficiency water reducing agent=0.20: 1: 0.0075 composition cement mortar, the steel fibre of admixture volume volume 1.0% in this cement mortar, earlier load weighted mixing water and high efficiency water reducing agent are dropped into mixer, dropping into load weighted cement again stirred 120 seconds, under the state that keeps mixer to continue to stir, drop into load weighted steel fibre slowly then, steel fibre feeds intake and keeps in the process mixer to continue to stir, continue to stir discharging after 300 seconds after steel fibre feeds intake and finishes, the fluidity of measuring steel fiber feinforced cement slurry mixture is 90mm;
In second step, pour into die trial
The steel fiber feinforced cement slurry mixture that the first step is mixed with pours in the nonmetal die trial of 40mm * 40mm * 160mm;
In the 3rd step, apply magnetic field
The nonmetal die trial that pours into the steel fiber feinforced cement slurry mixture that the first step is mixed with that second step was obtained places in the skeleton cavity of coil of equipment of preparation unidirectionally-distributed steel fiber reinforced cement paste, the direction that coil generates magnetic field is consistent with test specimen long axis direction, again this coil and die trial are placed on the shake table of the said equipment together, the dc source of opening the said equipment makes coil electricity form magnetic field, apply magnetic field with the steel fiber feinforced cement slurry mixture that the first step is mixed with, tension direction when magnetic direction and test specimen test or duty is consistent or determines that according to designing requirement above-mentioned coil intrinsic inductance is 10.0 * 10
-3T, the shake table of opening the said equipment vibrates 300 seconds, close the shake table of the said equipment then in order successively and it is shifted out under die trial, the skeleton cavity of this coil is shifted out in the nonmetal die trial of cutting off the dc source of above-mentioned coil and will pouring into the steel fiber feinforced cement slurry mixture that the first step is mixed with;
The 4th step, form removal and maintenance
Applied the floating gently indoor environment that is placed in steel fiber feinforced cement slurry mixture test specimen surface in nonmetal die trial that obtains behind the magnetic field the 3rd step, the surface coverage plastic sheeting, form removal after 24 hours, move into the fog room maintenance, keeping temperature is 20 ± 2 ℃, relative humidity 〉=90%, the maintenance extremely 28d of regulation was taken out test specimen during the length of time from fog room, obtain unidirectionally-distributed steel fiber reinforced cement paste, recording its rupture strength according to GB/T 17671 " Test method for strength of hydraulic cement mortar " is 20.65MPa.
The comparative example 8
The 3rd step in lacking embodiment 8, other technologies are identical with embodiment 8.
Same maintenance is taken out test specimen during the length of time to the 28d of regulation from fog room, the steel fiber reinforced cement that obtains non-unidirectional distribution is starched, and recording its rupture strength according to GB/T 17671 " Test method for strength of hydraulic cement mortar " is 10.30MPa.
Embodiment 8 is identical with the steel fibre consumption with comparative example 8 raw material proportioning, and the 28d rupture strength of the unidirectionally-distributed steel fiber reinforced cement paste that embodiment 8 obtains is compared the 28d rupture strength raising 100% of the steel fiber reinforced cement slurry of the non-unidirectional distribution that obtains than embodiment 8.
Embodiment 9
The first step, preparation steel fiber feinforced cement slurry mixture
By mass ratio is water: cement: high efficiency water reducing agent=0.35: 1: 0.004 composition cement mortar, the steel fibre of admixture volume volume 0.4% in this cement mortar, earlier load weighted mixing water and high efficiency water reducing agent are dropped into mixer, dropping into load weighted cement again stirred 120 seconds, under the state that keeps mixer to continue to stir, drop into load weighted steel fibre slowly then, steel fibre feeds intake and keeps in the process mixer to continue to stir, continue to stir discharging after 300 seconds after steel fibre feeds intake and finishes, the fluidity of measuring steel fiber feinforced cement slurry mixture is 135mm;
In second step, pour into die trial
The steel fiber feinforced cement slurry mixture that the first step is mixed with pours in the nonmetal die trial of 40mm * 40mm * 160mm;
In the 3rd step, apply magnetic field
The nonmetal die trial that pours into the steel fiber feinforced cement slurry mixture that the first step is mixed with that second step was obtained places in the skeleton cavity of coil of equipment of preparation unidirectionally-distributed steel fiber reinforced cement paste, the direction that coil generates magnetic field is consistent with test specimen long axis direction, again this coil and die trial are placed on the shake table of the said equipment together, the dc source of opening the said equipment makes coil electricity form magnetic field, apply magnetic field with the steel fiber feinforced cement slurry mixture that the first step is mixed with, tension direction when magnetic direction and test specimen test or duty is consistent or determines that according to designing requirement above-mentioned coil intrinsic inductance is 5.0 * 10
-3T, the shake table of opening the said equipment vibrates 90 seconds, close the shake table of the said equipment then in order successively and it is shifted out under die trial, the skeleton cavity of this coil is shifted out in the nonmetal die trial of cutting off the dc source of above-mentioned coil and will pouring into the steel fiber feinforced cement slurry mixture that the first step is mixed with;
The 4th step, form removal and maintenance
Applied the floating gently indoor environment that is placed in steel fiber feinforced cement slurry mixture test specimen surface in nonmetal die trial that obtains behind the magnetic field the 3rd step, the surface coverage plastic sheeting, form removal after 24 hours, move into the fog room maintenance, keeping temperature is 20 ± 2 ℃, relative humidity 〉=90%, and the maintenance extremely 28d of regulation was taken out test specimen during the length of time from fog room, obtain unidirectionally-distributed steel fiber reinforced cement paste, recording its rupture strength according to GB/T 17671 " Test method for strength of hydraulic cement mortar " is 7.85MPa.
The comparative example 9
Remove the raw materials used water of press in the first step: cement: high efficiency water reducing agent=form cement mortar at 0.35: 1: 0.004, the steel fibre of admixture volume volume 0.8% and lacking outside the 3rd among the embodiment 9 go on foot in this cement mortar, other technologies are identical with embodiment 9.
Same maintenance is taken out test specimen during the length of time to the 28d of regulation from fog room, the steel fiber reinforced cement that obtains non-unidirectional distribution is starched, and recording its rupture strength according to GB/T 17671 " Test method for strength of hydraulic cement mortar " is 7.80MPa.
Embodiment 9 is the same substantially with comparative example 9 28d rupture strength, and the steel fibre consumption of the steel fiber reinforced cement of the unidirectional distribution that embodiment 9 obtains slurry has only half of steel fibre consumption of the steel fiber reinforced cement slurry of the non-unidirectional distribution that comparative example 9 obtains, and has reduced by 60%.
In the foregoing description 7～9: the number of turn of the coil of the equipment of used preparation unidirectionally-distributed steel fiber reinforced cement paste is selected in 100～3000 circles and length l are the scope of 100～160mm, with the length that guarantees to be longer than the nonmetal die trial in the skeleton cavity that places coil, cavity shape in its skeleton and size determine that according to the shape and the size that are placed into the nonmetal die trial that has poured into steel fiber feinforced cement slurry mixture wherein the nonmetal die trial that permission will pour into steel fiber feinforced cement slurry mixture is placed in one; Described shake table is the mechanical cement slurry shake table, the absorption of no magnetic force, and its amplitude is 0.5 ± 0.2mm, vibration frequency is 2850 times/minute, meets " cement physical test instrument glue sand shake table " and (JCT723-2005) stipulates or other industry relevant criterion; Steel fibre is made by meeting the structural steel standard.
Claims (4)
1. the equipment of preparation unidirectionally-distributed steel fiber reinforced cement sill is characterized in that: be made of shake table (3), coil (2) and dc source (1); Dc source (1) is provided with alternating current input, DC output end, switch (5) and Current Control knob (4); The number of turn of coil (2) is 100～3000 circles, length is 100～550mm, cavity shape in its skeleton and size determine that according to shape that is placed into the nonmetal die trial that has poured into steel fiber feinforced cement sill mixture wherein and size the nonmetal die trial that permission will pour into the steel fiber reinforced concrete mixture is placed in one; The DC output end of dc source (1) is connected to coil (2), and coil (2) is placed on the shake table (3).
2. according to the equipment of the described preparation unidirectionally-distributed steel fiber reinforced cement of claim 1 sill, it is characterized in that: shake table (3) is mechanical type concrete vibrating stand, mechanical type mortar shake table or mechanical cement slurry shake table, wherein the mechanical type concrete vibrating stand does not have magnetic force absorption, its amplitude is 0.5 ± 0.2mm, and vibration frequency is 2850 times/minute; Mechanical type mortar shake table does not have magnetic force absorption, and its amplitude is 0.5 ± 0.2mm, and vibration frequency is 2850 times/minute; The mechanical cement slurry shake table does not have magnetic force absorption, and its amplitude is 0.5 ± 0.2mm, and vibration frequency is 2850 times/minute.
3. according to the equipment of the described preparation unidirectionally-distributed steel fiber reinforced cement of claim 1 sill, it is characterized in that: the cavity cross section of coil (2) is square.
4. according to the equipment of the described preparation unidirectionally-distributed steel fiber reinforced cement of claim 1 sill, it is characterized in that: the size of shake table (3) is can place coil and die trial is as the criterion.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104612147A (en) * | 2015-01-16 | 2015-05-13 | 河海大学 | Cast-in-situ directional steel fiber concrete large-diameter tubular pile mold and construction method thereof |
| CN110552508A (en) * | 2019-09-11 | 2019-12-10 | 上海市市政规划设计研究院有限公司 | method for directionally arranging steel fibers of ultrahigh-performance concrete |
| CN114986660A (en) * | 2022-05-09 | 2022-09-02 | 河海大学 | Forming device and method for fiber reinforced cement-based material |
| WO2023159450A1 (en) * | 2022-02-25 | 2023-08-31 | 中铁大桥局集团有限公司 | Gradient function ultra-high performance concrete product, preparation method therefor, and application thereof |
-
2010
- 2010-07-23 CN CN2010202697807U patent/CN201769264U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104612147A (en) * | 2015-01-16 | 2015-05-13 | 河海大学 | Cast-in-situ directional steel fiber concrete large-diameter tubular pile mold and construction method thereof |
| CN110552508A (en) * | 2019-09-11 | 2019-12-10 | 上海市市政规划设计研究院有限公司 | method for directionally arranging steel fibers of ultrahigh-performance concrete |
| WO2023159450A1 (en) * | 2022-02-25 | 2023-08-31 | 中铁大桥局集团有限公司 | Gradient function ultra-high performance concrete product, preparation method therefor, and application thereof |
| CN114986660A (en) * | 2022-05-09 | 2022-09-02 | 河海大学 | Forming device and method for fiber reinforced cement-based material |
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