CN111610220A - Steel slag concrete unit pouring device and measuring device and method comprising device - Google Patents
Steel slag concrete unit pouring device and measuring device and method comprising device Download PDFInfo
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- CN111610220A CN111610220A CN202010320600.1A CN202010320600A CN111610220A CN 111610220 A CN111610220 A CN 111610220A CN 202010320600 A CN202010320600 A CN 202010320600A CN 111610220 A CN111610220 A CN 111610220A
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- 239000002893 slag Substances 0.000 title claims abstract description 84
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 69
- 239000010959 steel Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims description 13
- 239000002184 metal Substances 0.000 claims abstract description 11
- 238000012360 testing method Methods 0.000 claims description 100
- 238000010438 heat treatment Methods 0.000 claims description 50
- 238000001816 cooling Methods 0.000 claims description 14
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 238000007689 inspection Methods 0.000 claims description 10
- 239000002609 medium Substances 0.000 claims description 8
- 239000012736 aqueous medium Substances 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000005259 measurement Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/16—Investigating or analyzing materials by the use of thermal means by investigating thermal coefficient of expansion
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- E—FIXED CONSTRUCTIONS
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- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
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Abstract
The invention discloses a steel slag concrete unit pouring device which comprises a base and a horizontal support, wherein a support rod is connected with the base and the horizontal support, a rigid corrugated plate is arranged on the base, a flexible corrugated pipe is arranged in the rigid corrugated plate, a raised circular ring is arranged on the base, the tail end of the flexible corrugated pipe is positioned on the raised circular ring and is fixed on the raised circular ring through a metal hoop, a support sheet is arranged on the support rod, a cover plate is arranged on the support sheet and is provided with a boss, and the top end of the flexible corrugated pipe is fixed on the boss through the metal hoop. According to the steel slag concrete unit pouring device, the flexible corrugated pipe and the rigid corrugated plate are arranged outside the steel slag concrete, the rigid corrugated plate plays a role in supporting pressure during steel slag concrete pouring, the flexible corrugated pipe almost has no constraint on the deformation of the finally-set steel slag concrete, the interference of external constraint is reduced, and the flexible corrugated pipe does not need to be detached due to no interference.
Description
Technical Field
The invention relates to a steel slag concrete unit pouring device, a determination device comprising the same and a determination method comprising the same, and belongs to the field of steel slag concrete material testing.
Background
Concrete materials are the most widely used building materials at present due to their excellent mechanical properties. However, early cracking of concrete has been an important factor limiting its durability. The coefficient of thermal expansion is an important parameter affecting early cracking of concrete. In the initial stage of concrete pouring, temperature stress is formed in the concrete due to the change of the environmental temperature, and the concrete is cracked early in severe cases, so that the durability of the concrete is influenced. Therefore, the thermal expansion coefficient of the early-age concrete is accurately measured, the method is very important for the early crack resistance evaluation of the concrete, and the measurement result of the existing measurement method is inaccurate.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a steel slag concrete unit pouring device, a determination device comprising the device and a determination method.
The technical scheme is as follows: in order to solve the technical problem, the steel slag concrete unit pouring device comprises a base and a horizontal support, wherein a support rod is connected with the base and the horizontal support, a rigid corrugated plate is arranged on the base, a flexible corrugated pipe is arranged in the rigid corrugated plate, a raised circular ring is arranged on the base, the tail end of the flexible corrugated pipe is positioned on the raised circular ring and fixed on the raised circular ring through a metal hoop, a support sheet is arranged on the support rod, a cover plate is arranged on the support sheet, a boss is arranged on the cover plate, and the top end of the flexible corrugated pipe is fixed on the boss through the metal hoop.
Preferably, a spiral heating pipe is arranged in the flexible corrugated pipe, and two ends of the heating pipe extend out of the cover disc and the base disc.
The utility model provides a survey device of early age thermal expansion coefficient of slag concrete, including alternating temperature bucket and constant temperature bucket, foretell slag concrete unit pouring device has all been placed in alternating temperature bucket and constant temperature bucket, be equipped with the electronic amesdial on the horizontal stand, two electronic amesdials patrol the appearance with the displacement and are connected, all be equipped with first temperature sensor in alternating temperature bucket and constant temperature bucket, two first temperature sensor all patrol the appearance with the temperature and be connected, alternating temperature bucket and constant temperature bucket all are equipped with heating medium, heating medium all is connected with heating device.
Preferably, the heating device comprises a water-cooling temperature control machine and a first micro pump, the water-cooling temperature control machine is provided with a water inlet pipe and a water outlet pipe, the first micro pump is positioned at the end part of the water inlet pipe, an aqueous medium is arranged in the testing barrel, the aqueous medium enters the water-cooling temperature control machine through the first micro pump to be heated, the aqueous medium enters the testing barrel through the water outlet pipe after being heated to a proper temperature, and the heating pipe is connected with the second micro pump.
Preferably, the heating device comprises a first micro pump and an air heating device, the testing barrel is sealed, the air heating device is communicated with an air mixer, the air mixer is communicated with outdoor air through an air inlet pipe, an air inlet valve with adjustable opening degree is arranged on the air inlet pipe, a third temperature sensor is further arranged on the air inlet pipe, a fourth temperature sensor is arranged between the air mixer and the air heating device, a fifth temperature sensor is arranged on an air outlet pipe of the air mixer, the air outlet pipe enters from the top of the temperature-changing barrel, and the bottom of the temperature-changing barrel is connected with the first micro pump; the base and the cover disc are both provided with small holes, the heating pipe is positioned in the test block bracket and penetrates through the small holes, and the heating pipe is connected with the second micro pump.
The method for measuring the early-age thermal expansion coefficient of the steel slag concrete comprises the following steps:
assembling test block supports of a variable-temperature test group and a constant-temperature test group, mounting a rigid corrugated pipe on the outer side surface of a flexible corrugated pipe, placing the test block supports in a variable-temperature barrel and a constant-temperature barrel, and injecting steel slag concrete from a gap of a cover disc and vibrating; embedding a first temperature sensor in the center of the steel slag concrete, leveling the steel slag concrete after controlling the height, and preparing a test block for later use;
step two, mounting the electronic dial indicator on a horizontal bracket, and blocking by using a metal sheet; placing the test block support and the test block into a temperature-changing barrel, and placing a second temperature sensor into the temperature-changing barrel; connecting the first micro pump with the air heating device; connecting the first temperature sensor, the second temperature sensor and the temperature polling instrument; connecting the electronic dial indicator with the displacement polling instrument; checking all lines;
thirdly, after the test block is finally solidified, removing the rigid corrugated pipe, ejecting the electronic dial indicator to the surface of the test block, starting the air heating device, the displacement inspection instrument and the temperature inspection instrument, debugging, sealing the variable-temperature barrel, and keeping the temperature of the constant-temperature testing group at a set value;
step four, starting testing, regulating the temperature to be increased from t1 to t2, cooling to t3 after keeping the temperature for a period of time, increasing the temperature to t2 again after keeping the temperature for a period of time, and continuously acquiring and recording temperature and strain data in the whole testing process;
step five, calculating the thermal expansion coefficients of the variable temperature testing group and the constant temperature testing group according to the acquired temperature and strain data,
the calculation formula of the thermal expansion coefficient of the temperature change test group is as follows:
wherein
For the temperature-variable test of the total strain, Delta L, of the steel slag concreteMThe length change value L of the steel slag concrete of the temperature change test group measured by an electronic dial indicatorMFor the initial length of the slag concrete of the test group,
in order to test the thermal strain of the steel slag concrete,
the steel slag concrete self-strain is tested;
the thermal expansion coefficient of the constant temperature test group is calculated by the following formula:
wherein,
for constant temperature testing of the total strain, Delta L, of the steel slag concreteNThe length change value L of the steel slag concrete of the constant temperature test group measured by an electronic dial indicatorNFor the constant temperature test of the initial length of the steel slag concrete,
the steel slag concrete self-strain is tested at constant temperature;
since the self-strain of the steel slag concrete is determined by the self-property, the following steps are performed:
therefore, the thermal strain of the temperature change test set comprises:
each temperature cycle period can calculate a thermal strain value in the constant temperature stage, so that the thermal expansion coefficient is calculated by the formula of the ith and i +1 th thermal strains as follows:
wherein α is the thermal expansion coefficient, Δ TcThe temperature difference between the i-th and i + 1-th thermal strain slag concrete centers,
and
i and i +1 th thermal strain, T, respectivelyi cAnd
the central temperatures of the ith and i +1 th steel slag concrete are respectively.
In the invention, the steel slag concrete is poured in the test block bracket, and the measurement can be started after the steel slag concrete is finally set without dismantling a mold. The flexible corrugated pipe is adopted to almost have no constraint on concrete deformation, so that the interference of external constraint is reduced, and the measurement precision is high. By adopting the constant temperature set, the steel slag concrete has self-strain in the hydration process of the steel slag concrete besides the thermal strain caused by the external temperature change. A control group is scientific and rigorous and is derived from strain, and the deformation of the test group is the combination of thermal strain and self-strain. The heating pipe is arranged in the middle of the steel slag concrete, so that the steel slag concrete can be heated and cooled inside and outside simultaneously, the temperature can be adjusted more quickly, temperature change measures are taken inside and outside simultaneously, the temperature is more uniform, and the measurement result is more accurate.
Has the advantages that: according to the steel slag concrete unit pouring device, the flexible corrugated pipe and the rigid corrugated plate are arranged outside the steel slag concrete, the rigid corrugated plate plays a role in supporting pressure during steel slag concrete pouring, the flexible corrugated pipe almost has no constraint on the deformation of the finally-set steel slag concrete, the interference of external constraint is reduced, and the flexible corrugated pipe does not need to be detached due to no interference; the testing device does not need to be disassembled from a mold, the thermal expansion coefficient of the slag concrete can be tested from the final set of the slag concrete, automatic testing is adopted in the whole testing process, human errors are avoided, the thermal expansion coefficient of the slag concrete with large aggregate can be tested, a water cooling pipe is paved in a test block, the adjusting speed of the internal temperature of the slag concrete is accelerated, and the thermal expansion coefficient can be tested for many times in a short time.
Drawings
FIG. 1 is a schematic view of a test block holder according to an embodiment of the present invention;
FIG. 2 is a schematic view of a test block holder A-A according to an embodiment of the present invention;
FIG. 3 is a top view of a test block holder in an embodiment of the present invention;
FIG. 4 is a schematic diagram of a testing apparatus according to an embodiment of the present invention;
fig. 5 is another schematic structural diagram of the embodiment of the invention.
The temperature-changing test device comprises a temperature-changing test set 1, a constant-temperature test set 2, a test barrel 3, a test block support 4, a first micro pump 5, a second micro pump 6, a water-cooling temperature control machine 7, an electronic dial indicator 8, a displacement inspection instrument 9, a first temperature sensor 10, a second temperature sensor 11, a temperature inspection instrument 12, a base 13, a support rod 14, a support sheet 15, a cover disc 16, a heating pipe 17, a flexible corrugated pipe 18, a rigid corrugated plate 19, a metal hoop 20, a horizontal support 21, a convex circular ring 22, an air mixer 23, an air inlet valve 24 and an air heating device 25.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1 to 5, the device for pouring a steel slag concrete unit of the present invention includes a base 13 and a horizontal support 21, wherein the base 13 and the horizontal support 21 are connected with a support rod 14, a rigid corrugated plate 19 is disposed on the base, a flexible corrugated pipe 18 is disposed in the rigid corrugated plate 19, a raised ring 22 is disposed on the base, the end of the flexible corrugated pipe 18 is disposed on the raised ring 22 and fixed on the raised ring 22 through a metal hoop 20, a support sheet 15 is mounted on the support rod 14, a cover plate is disposed on the support sheet 15, the cover plate is provided with a boss, the top end of the flexible corrugated pipe 18 is fixed on the boss through the metal hoop 20, a spiral heating pipe 17 is disposed inside the flexible corrugated pipe 18, and both ends of the heating pipe 17 extend out.
The utility model provides a survey device of early age thermal expansion coefficient of slag concrete, including alternating temperature bucket and constant temperature bucket, foretell slag concrete unit pouring device has all been placed in alternating temperature bucket and constant temperature bucket, be equipped with electronic micrometer 8 on horizontal stand 21, two electronic micrometer 8 are connected with displacement inspection appearance 9, all be equipped with first temperature sensor 10 in alternating temperature bucket and constant temperature bucket, two first temperature sensor 10 all are connected with temperature inspection appearance 12, alternating temperature bucket and constant temperature bucket all are equipped with heating medium, heating medium all is connected with heating device.
In the invention, the heating device comprises a water-cooling temperature control machine 7 and a first micro pump 5, the water-cooling temperature control machine 7 is provided with a water inlet pipe and a water outlet pipe, the first micro pump 5 is positioned at the end part of the water inlet pipe, a water medium is arranged in the testing barrel 3, the water medium enters the water-cooling temperature control machine 7 through the first micro pump 5 to be heated, and enters the testing barrel 3 through the water outlet pipe after being heated to a proper temperature, and a heating pipe 17 is connected with a second micro pump 6. The heating device can also be another embodiment, the heating device comprises a first micro pump 5 and an air heating device 25, the testing barrel 3 is closed, the air heating device 25 is communicated with an air mixer 23, the air mixer 23 is communicated with outdoor air through an air inlet pipe, an air inlet valve 24 with adjustable opening degree is arranged on the air inlet pipe, a third temperature sensor is further arranged on the air inlet pipe, a fourth temperature sensor is arranged between the air mixer 23 and the air heating device 25, a fifth temperature sensor is arranged on an air outlet pipe of the air mixer 23, the air outlet pipe enters from the top of the temperature-changing barrel, and the bottom of the temperature-changing barrel is connected with the first micro pump 5; the base 13 and the cover plate 16 are both provided with small holes, the heating pipe 17 is positioned inside the test block support 4 and penetrates through the small holes, and the heating pipe 17 is connected with the second micro pump 6.
The method for measuring the early-age thermal expansion coefficient of the steel slag concrete comprises the following steps:
assembling test block supports 4 of a variable temperature test group 1 and a constant temperature test group 2, mounting a rigid corrugated pipe on the outer side surface of a flexible corrugated pipe 18, placing the test block supports 4 in a variable temperature barrel and a constant temperature barrel, and injecting steel slag concrete from a gap of a cover disc 16 and vibrating; embedding a first temperature sensor 10 in the center of the steel slag concrete, leveling the steel slag concrete after controlling the height, and preparing a test block for later use;
step two, mounting the electronic dial indicator 8 on the horizontal bracket 21, and blocking by using a metal sheet; placing the test block support 4 and the test block into a temperature-changing barrel, and placing a second temperature sensor 11 into the temperature-changing barrel; connecting the first micro-pump 5 with the air heating device 25; connecting a first temperature sensor 10, a second temperature sensor 11 and a temperature polling instrument 12; connecting the electronic dial indicator 8 with the displacement polling instrument 9; checking all lines;
thirdly, after the test block is finally solidified, removing the rigid corrugated pipe, jacking the electronic dial indicator 8 to the surface of the test block, starting the air heating device 25, the displacement inspection instrument 9 and the temperature inspection instrument 12, debugging, sealing the variable-temperature barrel, and keeping the temperature of the constant-temperature testing group 2 constant at a set value;
step four, starting testing, regulating the temperature to be increased from t1 to t2, cooling to t3 after keeping the temperature for a period of time, increasing the temperature to t2 again after keeping the temperature for a period of time, and continuously acquiring and recording temperature and strain data in the whole testing process;
step five, calculating the thermal expansion coefficients of the variable temperature testing group 1 and the constant temperature testing group 2 according to the acquired temperature and strain data, wherein the thermal expansion coefficient calculation formula of the variable temperature testing group 1 is as follows:
wherein
For the temperature-changing test group 1 steel slag concrete total strain, Delta LMThe length change value L of the steel slag concrete of the temperature change test set 1 measured by an electronic dial indicator 8MFor the initial length of the slag concrete of the test group,
in order to test the thermal strain of the steel slag concrete,
the steel slag concrete self-strain is tested;
the thermal expansion coefficient calculation formula of the constant temperature test group 2 is as follows:
wherein,
for constant temperature testing of group 2 total strain, Δ L, of steel slag concreteNThe length change value L of the steel slag concrete of the constant temperature test group 2 measured by the electronic dial indicator 8NFor the constant temperature test group 2 initial length of the steel slag concrete,
the steel slag concrete self-strain of a constant temperature test group 2;
since the self-strain of the steel slag concrete is determined by the self-property, the following steps are performed:
therefore, the thermal strain of the temperature-changing test set 1 is as follows:
each temperature cycle period can calculate a thermal strain value in the constant temperature stage, so that the thermal expansion coefficient is calculated by the formula of the ith and i +1 th thermal strains as follows:
wherein α is the thermal expansion coefficient, Δ TcThe temperature difference between the i-th and i + 1-th thermal strain slag concrete centers,
and
i and i +1 th thermal strain, T, respectivelyi cAnd
the i-th and i + 1-th steel slag concrete central temperatures, i.e., the temperatures measured by the first temperature sensor 10, respectively.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (6)
1. The utility model provides a device is pour to slag concrete unit which characterized in that: including base and horizontal stand, be connected with the bracing piece at base and horizontal stand, be equipped with the rigidity buckled plate on the chassis, be equipped with flexible bellows in the rigidity buckled plate, be equipped with protruding ring on the chassis, flexible bellows end is located protruding ring to fix on protruding ring through the ferrule, install the support piece on the bracing piece, be equipped with the shrouding disc on the support piece, the shrouding disc is equipped with the boss, and the metal hoop is fixed on the boss through the flexible bellows top.
2. The steel slag concrete unit casting device according to claim 1, wherein: the flexible corrugated pipe is internally provided with a spiral heating pipe, and two ends of the heating pipe extend out of the cover plate and the base plate.
3. A device for measuring the thermal expansion coefficient of early-age steel slag concrete is characterized in that: including alternating temperature bucket and constant temperature bucket, all placed claim 1 or 2 in alternating temperature bucket and constant temperature bucket the device is pour to steel slag concrete unit, be equipped with the electronic amesdial on horizontal bracket, two electronic amesdials are patrolled and examined the appearance with the displacement and are connected, all are equipped with first temperature sensor in alternating temperature bucket and constant temperature bucket, and two first temperature sensor all patrol and examine the appearance with the temperature and be connected, and alternating temperature bucket and constant temperature bucket all are equipped with heating medium, and heating medium all is connected with heating device.
4. The apparatus for determining the early-age thermal expansion coefficient of steel slag concrete according to claim 3, wherein: heating device contains water-cooling temperature control machine and first micropump, and water-cooling temperature control machine is equipped with inlet tube and outlet pipe, and first micropump is located the inlet tube tip, has aqueous medium in the test bucket, and aqueous medium enters into the heating in the water-cooling temperature control machine through first micropump, heats and enters into the test bucket through the outlet pipe after suitable temperature, and the heating pipe is connected with the second micropump.
5. The apparatus for determining the early-age thermal expansion coefficient of steel slag concrete according to claim 3, wherein: the heating device comprises a first micro pump and an air heating device, the testing barrel is closed, the air heating device is communicated with an air mixer, the air mixer is communicated with outdoor air through an air inlet pipe, an air inlet valve with adjustable opening degree is arranged on the air inlet pipe, a third temperature sensor is further arranged on the air inlet pipe, a fourth temperature sensor is arranged between the air mixer and the air heating device, a fifth temperature sensor is arranged on an air outlet pipe of the air mixer, the air outlet pipe enters from the top of the temperature-changing barrel, and the bottom of the temperature-changing barrel is connected with the first micro pump; the base and the cover disc are both provided with small holes, the heating pipe is positioned in the test block bracket and penetrates through the small holes, and the heating pipe is connected with the second micro pump.
6. A method for determining the early-age coefficient of thermal expansion of steel slag concrete according to any one of claims 3 to 5, comprising the steps of:
assembling test block supports of a variable-temperature test group and a constant-temperature test group, mounting a rigid corrugated pipe on the outer side surface of a flexible corrugated pipe, placing the test block supports in a variable-temperature barrel and a constant-temperature barrel, and injecting steel slag concrete from a gap of a cover disc and vibrating; embedding a first temperature sensor in the center of the steel slag concrete, leveling the steel slag concrete after controlling the height, and preparing a test block for later use;
step two, mounting the electronic dial indicator on a horizontal bracket, and blocking by using a metal sheet; placing the test block support and the test block into a temperature-changing barrel, and placing a second temperature sensor into the temperature-changing barrel; connecting the first micro pump with the air heating device; connecting the first temperature sensor, the second temperature sensor and the temperature polling instrument; connecting the electronic dial indicator with the displacement polling instrument; checking all lines;
thirdly, after the test block is finally solidified, removing the rigid corrugated pipe, ejecting the electronic dial indicator to the surface of the test block, starting the air heating device, the displacement inspection instrument and the temperature inspection instrument, debugging, sealing the variable-temperature barrel, and keeping the temperature of the constant-temperature testing group at a set value;
step four, starting testing, regulating the temperature to be increased from t1 to t2, cooling to t3 after keeping the temperature for a period of time, increasing the temperature to t2 again after keeping the temperature for a period of time, and continuously acquiring and recording temperature and strain data in the whole testing process;
step five, calculating the thermal expansion coefficients of the variable temperature testing group and the constant temperature testing group according to the acquired temperature and strain data,
the calculation formula of the thermal expansion coefficient of the temperature change test group is as follows:
wherein
For the temperature-variable test of the total strain, Delta L, of the steel slag concreteMThe length change value L of the steel slag concrete of the temperature change test group measured by an electronic dial indicatorMFor the initial length of the slag concrete of the test group,
in order to test the thermal strain of the steel slag concrete,
the steel slag concrete self-strain is tested;
the thermal expansion coefficient of the constant temperature test group is calculated by the following formula:
wherein,
for constant temperature testing of the total strain, Delta L, of the steel slag concreteNThe length change value L of the steel slag concrete of the constant temperature test group measured by an electronic dial indicatorNFor the constant temperature test of the initial length of the steel slag concrete,
the steel slag concrete self-strain is tested at constant temperature;
since the self-strain of the steel slag concrete is determined by the self-property, the following steps are performed:
therefore, the thermal strain of the temperature change test set comprises:
each temperature cycle period can calculate a thermal strain value in the constant temperature stage, so that the thermal expansion coefficient is calculated by the formula of the ith and i +1 th thermal strains as follows:
wherein α is the thermal expansion coefficient, Δ TcThe temperature difference between the i-th and i + 1-th thermal strain slag concrete centers,
and
i and i +1 th thermal strain, T, respectivelyi cAnd
the central temperatures of the ith and i +1 th steel slag concrete are respectively.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115262974A (en) * | 2022-08-04 | 2022-11-01 | 深圳市市政工程总公司 | Intelligent control construction method for large-volume concrete cracks |
| CN115262974B (en) * | 2022-08-04 | 2023-08-18 | 深圳市市政工程总公司 | Intelligent control construction method for large-volume concrete cracks |
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