CN108298911A - A kind of steel fiber reinforced concrete, preparation method and its application of the emergent repairing of low shrinkage anti-crack - Google Patents
A kind of steel fiber reinforced concrete, preparation method and its application of the emergent repairing of low shrinkage anti-crack Download PDFInfo
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- CN108298911A CN108298911A CN201810208567.6A CN201810208567A CN108298911A CN 108298911 A CN108298911 A CN 108298911A CN 201810208567 A CN201810208567 A CN 201810208567A CN 108298911 A CN108298911 A CN 108298911A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
- E01C7/14—Concrete paving
- E01C7/147—Repairing concrete pavings, e.g. joining cracked road sections by dowels, applying a new concrete covering
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Civil Engineering (AREA)
- Architecture (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Bridges Or Land Bridges (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The present invention provides a kind of steel fiber reinforced concretes and preparation method thereof of the emergent repairing of low shrinkage anti-crack, and for steel fiber reinforced concrete in terms of parts by weight, every cubic metre of steel fiber reinforced concrete includes following components：270~290 parts of cementitious material, 700~800 parts of river sand, granularity are 39~78 parts of 900~950 parts of the rubble of 5~10mm, 150~190 parts of portland cement, 11~14 parts of methyl ethyl ketone peroxide, 11~14 parts of cobalt iso-octoate and steel fibre.Steel fiber reinforced concrete shrinking percentage under the synergistic effect of above-mentioned content component is low, and good mechanical properties；Elasticity modulus is low；Cementitious material usage amount is low.1~3 hour compression strength of steel fiber reinforced concrete is not less than 20MPa；Brazilian tension intensity is not less than 5MPa；Total shrinkage is 1~2 ‰；Cylindrical shape steel fiber reinforced concrete 28d 55~60MPa of compression strength, cubic 82MPa；Elasticity modulus is less than 20GPa.
Description
Technical field
The present invention relates to the steel fibre of building material technical field more particularly to a kind of emergent repairing of low shrinkage anti-crack is mixed
Solidifying soil, preparation method and its application.
Background technology
The emergent repairing steel fiber reinforced concrete of low shrinkage anti-crack because having rapid condensation hardening, early strength high, contraction is low,
It is strong to resist cracking performance, can quickly repair structure, reduce curing time, especially in terms of road emergency reparation, reduce
Road off-period reduces since the advantages that traffic congestion, technical research has become road maintenance caused by road rehabilitation
One of the technology that industry is paid close attention to.With the high speed development of country, urban transportation is increasingly flourishing, and highway load is increasing,
The destruction such as cracking, pit-hole frequent occurrence of highway bridge face layer, and the rush repair of Municipal public utility happens occasionally, it is low
The emergent repairing steel fiber reinforced concrete of cracking resistance is shunk in the rush repair of Urban Public facility, ensures the engineerings such as city orderly function
In have application advantage outstanding.
The emergent repairing steel fiber reinforced concrete of low shrinkage anti-crack refers to maintenance 1-3 hours, and cubic compressive strength is more than
20MPa, flexural strength are more than the concrete of 5MPa.When majority technology prepares super hardening pavement patching concrete at present, be gelled material
Material system is complicated, can generally various active spike be used to improve performance.Such as patent CN102701684A is by aluminium sulfate water
Mud, river sand, rubble, miberal powder, solid accelerating component, liquid accelerating component and tap water carry out mixing and fully stirring by weight ratio
It mixes, solid accelerating component is one or more of sodium gluconate, lithium chloride, potassium fluoride, silicon ash, liquid accelerating component
For one or both of polycarboxylate water-reducer, methyl silanol sodium solution, system complexity causes concrete production flow complicated, can
Change factor increases, and curing condition is high so that the technology is difficult to real large-scale application in Practical Project, eventually disengages from and actually answers
With.
Invention content
In view of this, the purpose of the present invention is to provide a kind of steel fiber reinforced concrete and preparation method thereof, the steel fibre is mixed
The shrinking percentage for coagulating soil is low, and good mechanical properties.
The present invention provides a kind of steel fiber reinforced concretes of the emergent repairing of low shrinkage anti-crack often to be stood in terms of parts by weight
Square meter Suo Shu steel fiber reinforced concretes include following components：
270~290 parts of cementitious material, 700~800 parts of river sand, granularity are 900~950 parts of the rubble of 5~10mm, silicic acid
39~78 parts of 150~190 parts of salt cement, 11~14 parts of methyl ethyl ketone peroxide, 11~14 parts of cobalt iso-octoate and steel fibre.
Preferably, the cementitious material is selected from unsaturated polyester resin；
The viscosity of the unsaturated polyester resin is 250~450MPas, and solid content is 63~69%.
Preferably, the shape of the steel fibre is arch, length 30mm, a diameter of 0.75mm.
Preferably, the material of the steel fibre is Q195 grades or more carbon steel, density 7850kg/m3。
Preferably, the moisture content of the river sand is less than 2%；
The granularity is that the moisture content of the rubble of 5~10mm is less than 2%.
Preferably, the river sand is selected from middle sand；
Mountain flour mass content is not more than 4% in the middle sand；Clod mass content is not more than 0.5%.
Preferably, gill shape mass content is not more than 5% in the rubble that the granularity is 5~10mm, and mud mass content is not
More than 0.5%.
Preferably, the portland cement is PO42.5 Portland cements, and glue sand compression strength is not less than within 28 days
48MPa。
The present invention provides a kind of preparation methods of steel fiber reinforced concrete described in above-mentioned technical proposal, include the following steps：
River sand, rubble, the portland cement that granularity is 5~10mm are first mixed, steel fibre is then added, mixes, obtains
First mixture；
Methyl ethyl ketone peroxide, cobalt iso-octoate and cementitious material are mixed, the second mixture is obtained；
Second mixture is added in the first mixture, is stirred evenly, the steel of the emergent repairing of low shrinkage anti-crack is obtained
Fiber concrete.
The present invention provides a kind of methods that steel fiber reinforced concrete repairs road surface, include the following steps：
Road surface to be repaired is pre-processed, reserved construction joint is arranged with template, obtains pretreatment road surface；
Steel fibre prepared by preparation method described in steel fiber reinforced concrete described in above-mentioned technical proposal or above-mentioned technical proposal
Concreting is vibrated to road surface is pre-processed, and is then smoothed out, and after standing 30~40min, takes out template, in reserved construction joint
Pour mortar, plug and pound it is closely knit, stand 1~3 hour, complete the repairing on road surface.
The present invention provides a kind of steel fiber reinforced concretes of the emergent repairing of low shrinkage anti-crack often to be stood in terms of parts by weight
Square meter Suo Shu steel fiber reinforced concretes include following components：270~290 parts of cementitious material, 700~800 parts of river sand, granularity be 5~
900~950 parts of the rubble of 10mm, 150~190 parts of portland cement, 11~14 parts of methyl ethyl ketone peroxide, cobalt iso-octoate 11~14
39~78 parts of part and steel fibre.Contraction of the steel fiber reinforced concrete provided by the invention under the synergistic effect of the component of above-mentioned content
Rate is low, and good mechanical properties.In addition, the elasticity modulus of the steel fiber reinforced concrete is low；Cementitious material usage amount is low.Experimental result
Show：The usage amount of cementitious material is 270~290kg/m3；1~3 hour compression strength of steel fiber reinforced concrete is not less than
20MPa；Brazilian tension intensity is not less than 5MPa；Total shrinkage is 1~2 ‰；The cylindrical compressive strength of 28d steel fiber reinforced concretes
For 55~60MPa；The cubic compressive strength of 28d steel fiber reinforced concretes is 80~85MPa；Elasticity modulus is less than 20GPa.
Description of the drawings
Fig. 1 is the steel fibre schematic diagram that the present invention uses；
Fig. 2 is the technique for applying flow chart of the steel fiber reinforced concrete of the emergent repairing of low shrinkage anti-crack；
Fig. 3 is that construction joint schematic diagram is reserved on road surface to be repaired；
Fig. 4 is that road surface pit slot to be repaired reserves construction joint scene photo；
Fig. 5 is the scene photo that the embodiment of the present invention 1 has been constructed 3 hours；
Fig. 6 is the relational graph of steel fiber reinforced concrete 7 days contract rates and time prepared by the embodiment of the present invention 1；
Fig. 7 is the cubic compressive strength of the length of side 100mm of the steel fiber reinforced concrete of the preparation of the embodiment of the present invention 1, splitting
The relational graph of intensity and age；
Fig. 8 is the static stress and deformation curve graph (examination of the different larval instar of steel fiber reinforced concrete prepared by the embodiment of the present invention 1
Sample is a diameter of 150mm, is highly the cylinder of 300mm)；
Fig. 9 is the dynamic compression strength enhancement factor and strain rate pair of steel fiber reinforced concrete prepared by the embodiment of the present invention 1
Several relational graphs；
Figure 10 is the Dynamic Splitting intensity enhancing factor and strain rate pair of steel fiber reinforced concrete prepared by the embodiment of the present invention 1
Several relational graphs.
Specific implementation mode
The present invention provides a kind of steel fiber reinforced concretes of the emergent repairing of low shrinkage anti-crack often to be stood in terms of parts by weight
Square meter Suo Shu steel fiber reinforced concretes include following components：
270~290 parts of cementitious material, 700~800 parts of river sand, granularity are 900~950 parts of the rubble of 5~10mm, silicic acid
39~78 parts of 150~190 parts of salt cement, 11~14 parts of methyl ethyl ketone peroxide, 11~14 parts of cobalt iso-octoate and steel fibre.
Shrinking percentage of the steel fiber reinforced concrete provided by the invention under the synergistic effect of the component of above-mentioned content is low, and mechanics
Performance is preferable.In addition, the elasticity modulus of the steel fiber reinforced concrete is low；Cementitious material usage amount is low.
In terms of parts by weight, steel fiber reinforced concrete provided by the invention includes 270~290 parts of cementitious material, and preferably 275
~285 parts.In the specific embodiment of the invention, the cementitious material is 280 parts.The cementitious material is preferably selected from unsaturated tree
Fat；The viscosity of the unsaturated-resin is preferably 250~450MPas, and solid content is 63~69%.The unsaturated polyester (UP) tree
Fat is that have ester bond and unsaturation double made of unsaturated dibasic acid dihydric alcohol or monounsaturated dicarboxylic acid unsaturation dihydric alcohol polycondensation
The chain macromolecule compound of key；It can reprocess and obtain from discarded plastic beverage bottle (tank), be a kind of refuse reclamation, green
Color, environmentally friendly reconstituted product, can be molded, technique is flexible and convenient under room temperature and curing at low temperatures, normal pressure.Of the invention specific
In embodiment, the unsaturated-resin is specially model 191C unsaturated polyester resins.
Steel fiber reinforced concrete provided by the invention includes 700~800 parts of river sand, preferably 740~782 parts.In the present invention
In specific embodiment, the dosage of the river sand is specially 756 parts.The river sand is preferably selected from selected from middle sand；Stone in the middle sand
Powder mass content is preferably no greater than 4%；Clod mass content is preferably no greater than 0.5%.The fineness modulus of the middle sand is preferably
3.0.Biodiversity content in the river sand is preferably more than 2%.
Steel fiber reinforced concrete provided by the invention includes 900~950 parts of the rubble that granularity is 5~10mm.Have in the present invention
In body embodiment, the dosage of the rubble is specially 924 parts.Gill shape mass content in the rubble that the granularity is 5~10mm
Preferably no greater than 5%, mud mass content is not more than 0.5%.Biodiversity content in the rubble of the 5~10mm does not preferably surpass
Cross 2%.
Steel fiber reinforced concrete provided by the invention includes 150~190 parts of portland cement.In the specific embodiment of the invention
In, the specific dosage of the portland cement is 168 parts.The portland cement be PO42.5 Portland cements, 28
Its glue sand compression strength is not less than 48MPa.The portland cement consumptive use of water normal consistence is preferably no greater than 26%.
Steel fiber reinforced concrete provided by the invention includes 11~14 parts of methyl ethyl ketone peroxide.In the specific embodiment of the invention
In, the specific dosage of methyl ethyl ketone peroxide is 12 parts.The methyl ethyl ketone peroxide is curing agent.The methyl ethyl ketone peroxide is
White liquid is commonly called as plain boiled water；The density of methyl ethyl ketone peroxide is preferably 1.1~1.2g/mL.
Steel fiber reinforced concrete provided by the invention includes 11~14 parts of cobalt iso-octoate.In the specific embodiment of the invention, institute
It is 12 parts to state the specific dosage of cobalt iso-octoate.The cobalt iso-octoate is blue liquid, is commonly called as Lan Shui；The density of the cobalt iso-octoate is excellent
It is selected as 1.1~1.2g/mL.
Steel fiber reinforced concrete provided by the invention includes 39~78 parts of steel fibre.It is described in the specific embodiment of the invention
The specific dosage of steel fibre is 40 parts.The shape of the steel fibre is arch, length 30mm, a diameter of 0.75mm.The steel is fine
The material of dimension is Q195 grades or more carbon steel, density 7850kg/m3.Referring to Fig. 1, Fig. 1 is that the steel fibre that the present invention uses shows
It is intended to.
The present invention provides a kind of preparation methods of steel fiber reinforced concrete described in above-mentioned technical proposal, include the following steps：
River sand, rubble, the portland cement that granularity is 5~10mm are first mixed, steel fibre is then added, mixes, obtains
First mixture；
Methyl ethyl ketone peroxide, cobalt iso-octoate and cementitious material are mixed, the second mixture is obtained；
Second mixture is added in the first mixture, is stirred evenly, the steel of the emergent repairing of low shrinkage anti-crack is obtained
Fiber concrete.
The present invention preferably mixes the second mixture with the first mixture at twice；It is preferably added to the first mixture for the first time
70wt% add remainder after stirring 55~65s, stir 25~35s.Preferably, it is mixed that it is preferably added to first for the first time
The 70wt% of object is closed, after stirring 60s, remainder is added, stirs 30s.
The present invention provides a kind of methods that steel fiber reinforced concrete repairs road surface, include the following steps：
Road surface to be repaired is pre-processed, reserved construction joint is arranged with template, obtains pretreatment road surface；
Steel fibre coagulation prepared by steel fiber reinforced concrete described in above-mentioned technical proposal or above-mentioned technical proposal preparation method
Soil is poured to pretreatment road surface, is vibrated, is then smoothed out, and after standing 30~40min, takes out template, is poured in reserved construction joint
Mortar, plug and pound it is closely knit, stand 1~3 hour, complete the repairing on road surface.
Road surface to be repaired dross clean clearly is kept drying, forbids to be rinsed with water by the present invention.
Present invention preferably employs acrylic boards or plank sheathing as template.The width of the construction joint is preferably 2 centimetres.
The present invention is in order to increase bonding interface effect, preferably after steel fiber reinforced concrete initial set, pours steel fibre mortar.
In the present invention, the steel fibre mortar is in terms of parts by weight, including following components：280 parts of cementitious material, 1500 parts of river sand, silicon
150 parts of acid salt cement, 11~14 parts of methyl ethyl ketone peroxide, 11~14 parts of cobalt iso-octoate, 35~45 parts of steel fibre.Wherein, described
It is gelled described in cementitious material, river sand, portland cement, methyl ethyl ketone peroxide, cobalt iso-octoate and steel fibre and above-mentioned technical proposal
Material, river sand, portland cement, methyl ethyl ketone peroxide, cobalt iso-octoate are consistent with steel fibre, and details are not described herein.
In the present invention, the preparation method of the steel fibre mortar, preferably includes following steps：
River sand, portland cement and steel fibre are mixed, third mixture is obtained；
Methyl ethyl ketone peroxide, cobalt iso-octoate are added in cementitious material, mixes, obtains the 4th mixture；
Third mixture and the 4th mixture are mixed, stirs evenly, obtains steel fibre mortar.
Referring to Fig. 2, Fig. 2 is the technique for applying flow chart of the emergent repairing steel fiber reinforced concrete of low shrinkage anti-crack of the present invention；
As can be seen from Figure 2：
Dry sandstone (sandstone is the abbreviation of river sand and rubble), uniformly mixes after weighing sandstone and cement, then with weigh
Steel fibre uniformly mix, obtain mixture；
Resin will be weighed and curing agent uniformly mixes, then after evenly mixing with the catalyst after drying, then is mixed with mixture
It closes uniformly, obtains mending concrete；
After place is handled, place to be repaired is obtained, by region casting concrete to be repaired, vibrate 60s；
Prepare mortar according to concrete same method, mortar poured at the reserved construction joint in region to be repaired, insert lead it is close
It is real, it stands, completes the repairing of road.
The present invention provides a kind of steel fiber reinforced concretes of the emergent repairing of low shrinkage anti-crack often to be stood in terms of parts by weight
Square meter Suo Shu steel fiber reinforced concretes include following components：270~290 parts of cementitious material, 700~800 parts of river sand, granularity be 5~
900~950 parts of the rubble of 10mm, 150~190 parts of portland cement, 11~14 parts of methyl ethyl ketone peroxide, cobalt iso-octoate 11~14
39~78 parts of part and steel fibre.Contraction of the steel fiber reinforced concrete provided by the invention under the synergistic effect of the component of above-mentioned content
Rate is low, and good mechanical properties.In addition, the elasticity modulus of the steel fiber reinforced concrete is low；Cementitious material usage amount is low.Experimental result
Show：1~3 hour compression strength of steel fiber reinforced concrete is not less than 20MPa；Brazilian tension intensity is not less than 5MPa；It is total to shrink
Rate is 1~2 ‰；The compression strength of the steel fiber reinforced concrete of 28d cylindrical shapes is 55~60MPa；The steel fibre of 28d cubics
The compression strength of concrete is 80~85MPa；Elasticity modulus is less than 20GPa.
In order to further illustrate the present invention, emergent to a kind of low shrinkage anti-crack provided by the invention with reference to embodiment
Steel fiber reinforced concrete, preparation method and its application of repairing are described in detail, but they cannot be interpreted as to this hair
The restriction of bright protection domain.
Embodiment 1
Evening on May 30th, 2017, this product be applied to Zhongshan City, Guangdong Province G105 national highway great Shi pocket bridge bridge expanssion joints and
The repairing of universal love viaduct bridge floor pit slot, the emergent repairing steel fiber reinforced concrete product folk prescription (m of low shrinkage anti-crack3) coagulation local soil type
Divide as follows：191C unsaturated polyester resins 280kg, middle sand 756kg, granularity is rubble 924kg, the cement 168kg of 5~10mm,
Methyl ethyl ketone peroxide 12kg, cobalt iso-octoate 12kg, steel fibre 40kg.Material on deck after, operate according to the following steps：
The first step：Dry river sand and rubble to its water content that granularity is 5~10mm are below 2%, while handling to be repaired
Road surface is mended, reserved construction joint is arranged with acrylic board or plank sheathing；
Second step：Often disk mixing concrete 50L (0.05m3) is calculated and is weighed each constituent mass, resin 14kg, middle sand
37.8kg, granularity be 5~10mm rubble 46.2kg, cement 8.4kg, curing agent 600g, catalyst 600g and steel fibre 2kg；
Third walks：Middle sand, rubble, the cement that granularity is 5~10mm are put into pressure by feeding sequence from coarse to fine
In formula blender, 60s is stirred, so that uniformly；
4th step：Steel fibre is uniformly put into blender, middle sand, rubble, cement, steel fibre mixture are stirred
60s, so that uniformly；
5th step：It is carried out at the same time with the 4th step, curing agent is added in resin first, stir evenly, be then added and urge
Agent stirs evenly；
5th step：Resin compound is added in two portions in forced mixer, 70% is added for the first time, stirs 60s,
Second of addition residual resin, is stirred for 30s, obtains the steel fiber reinforced concrete of the emergent repairing of low shrinkage anti-crack；
6th step：Steel fiber reinforced concrete is poured to processed place to be repaired, vibrating head vibrates 60s, and spatula smoothes out table
Face is stood；
By cementitious material 280kg, river sand 1500kg, cement 150kg, 11~14kg of curing agent, 11~14kg of catalyst and
35~45kg of steel fibre, according to Step 4: the method for step 5 prepares steel fibre mortar；
7th step：It waits for that the 6th step is completed about 30~40 minutes, takes out acrylic board or plank sheathing, pour steel fibre sand
Slurry, plugs and pounds closely knit, standing.
Fig. 4 is that road surface pit slot to be repaired reserves construction joint scene photo；
Fig. 5 is the scene photo constructed 3 hours；
Fig. 6 is 7 days contract rates of steel fiber reinforced concrete and time chart prepared by the embodiment of the present invention 1；It is seen by Fig. 6
Go out：Intensity enhances with the growth of time, and intensity increases comparatively fast in the short time, and later strength is without retraction；Total shrinkage is
1.6‰。
Fig. 7 is the cubic compressive strength and cube cleavage strength of steel fiber reinforced concrete prepared by the embodiment of the present invention 1
With age relational graph；From figure 7 it can be seen that the cube cleavage strength of steel fiber reinforced concrete is the 1/8 of cubic compressive strength
~1/10, and cleavage strength is not less than 5MPa, can reach 10MPa or so.1~3 hour compression strength of steel fiber reinforced concrete
Not less than 20MPa.
Fig. 8 is the static stress and deformation curve graph of the different larval instar of steel fiber reinforced concrete prepared by the embodiment of the present invention 1；From
Fig. 8 can be seen that the increase of the age with concrete, and the elasticity modulus of concrete is increasing, and limit circumferential direction strain variation is not
Greatly, but plastic deformation ability is weakening；Elasticity modulus is less than 20GPa, specially 13.1GPa；The steel fibre of 28d cylindrical shapes
The compression strength of concrete is 58.3MPa.
Fig. 9 is the dynamic compression strength enhancement factor and strain rate pair of steel fiber reinforced concrete prepared by the embodiment of the present invention 1
Several relational graphs；Figure 10 is the Dynamic Splitting intensity enhancing factor and the strain of steel fiber reinforced concrete prepared by the embodiment of the present invention 1
The relational graph of rate logarithm.From Fig. 9 and Figure 10 can be seen that compression strength and cleavage strength with load strain rate raising and
It improves, while the strain rate effect relationship in european norm CEB2010 is not particularly suited for this concrete.
Embodiment 2
The evening on the 30th of September in 2017, this product are applied to the repairing of Zhongshan City, Guangdong Province bridge floor pit slot, this lower shrinkage is anti-to be opened
Split emergent repairing steel fiber reinforced concrete product folk prescription (m3) concrete component is as follows：191C unsaturated polyester resins 270kg, middle sand
800kg, granularity are the rubble 900kg, cement 155kg, methyl ethyl ketone peroxide 14kg of 5~10mm, cobalt iso-octoate 14kg, steel fibre
39kg.Material on deck after, operate according to the following steps：
The first step：Dry river sand and rubble to its water content that granularity is 5~10mm are below 2%, while handling to be repaired
Road surface is mended, reserved construction joint is arranged with acrylic board or plank sheathing；
Second step：Often disk mixing concrete 50L (0.05m3) is calculated and is weighed each constituent mass, resin 13.5kg, middle sand
40kg, rubble 45kg, cement 7.75kg, curing agent 700g, catalyst 700g and the steel fibre 1.95kg that granularity is 5~10mm；
Third walks：Middle sand, rubble, the cement that granularity is 5~10mm are put into pressure by feeding sequence from coarse to fine
In formula blender, 60s is stirred, so that uniformly；
4th step：Steel fibre is uniformly put into blender, middle sand, rubble, cement, steel fibre mixture are stirred
60s, so that uniformly；
5th step：It is carried out at the same time with the 4th step, curing agent is added in resin first, stir evenly, be then added and urge
Agent stirs evenly；
5th step：Resin compound is added in two portions in forced mixer, 70% is added for the first time, stirs 60s,
Second of addition residual resin, is stirred for 30s, obtains the steel fiber reinforced concrete of the emergent repairing of low shrinkage anti-crack；
6th step：Steel fiber reinforced concrete is poured to processed place to be repaired, vibrating head vibrates 60s, and spatula smoothes out table
Face is stood；
By cementitious material 280kg, river sand 1500kg, cement 150kg, 11~14kg of curing agent, 11~14kg of catalyst and
35~45kg of steel fibre, according to Step 4: the method for step 5 prepares steel fibre mortar；
7th step：It waits for that the 6th step is completed about 30~40 minutes, takes out acrylic board or plank sheathing, pour steel fibre sand
Slurry, plugs and pounds closely knit, standing.
The total shrinkage of steel fiber reinforced concrete prepared by embodiment 2 is 1.4 ‰.
The compression strength of the steel fiber reinforced concrete of 1~3 hour cubic of steel fiber reinforced concrete is not less than 20MPa, tool
Body is 30MPa；
The compression strength of the steel fiber reinforced concrete of 28d cylindrical shapes is 55MPa, elasticity modulus 12.5GPa；
The compression strength of the steel fiber reinforced concrete of 28d cubics is 80.5MPa.
As seen from the above embodiment, the present invention provides a kind of steel fiber reinforced concrete of the emergent repairing of low shrinkage anti-crack,
In terms of parts by weight, every cubic metre of steel fiber reinforced concrete includes following components：270~290 parts of cementitious material, river sand 700
~800 parts, granularity is 900~950 parts of the rubble of 5~10mm, 150~190 parts of portland cement, methyl ethyl ketone peroxide 11~14
Part, 39~78 parts of 11~14 parts of cobalt iso-octoate and steel fibre.Component of the steel fiber reinforced concrete provided by the invention in above-mentioned content
Synergistic effect under shrinking percentage it is low, and good mechanical properties.In addition, the elasticity modulus of the steel fiber reinforced concrete is low；Be gelled material
Expect that usage amount is low.The experimental results showed that：The usage amount of cementitious material is 270~290kg/m3；Steel fiber reinforced concrete 1~3 hour
Compression strength be not less than 20MPa；Brazilian tension intensity is not less than 5MPa；Total shrinkage is 1~2 ‰；The steel of 28d cylindrical shapes
The compression strength of fiber concrete is 55~60MPa；The compression strength of the steel fiber reinforced concrete of 28d cubics be 80~
85MPa；Elasticity modulus is less than 20GPa.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of steel fiber reinforced concrete of the emergent repairing of low shrinkage anti-crack, in terms of parts by weight, every cubic metre of steel fibre
Concrete includes following components：
270~290 parts of cementitious material, 700~800 parts of river sand, granularity are 900~950 parts of the rubble of 5~10mm, silicate cement
39~78 parts of 150~190 parts of mud, 11~14 parts of methyl ethyl ketone peroxide, 11~14 parts of cobalt iso-octoate and steel fibre.
2. steel fiber reinforced concrete according to claim 1, which is characterized in that the cementitious material is selected from unsaturated polyester (UP) tree
Fat；
The viscosity of the unsaturated polyester resin is 250~450MPas, and solid content is 63~69%.
3. steel fiber reinforced concrete according to claim 1, which is characterized in that the shape of the steel fibre is arch, length
For 30mm, a diameter of 0.75mm.
4. steel fiber reinforced concrete according to claim 1, which is characterized in that the material of the steel fibre is Q195 grades or more
Carbon steel, density 7850kg/m3。
5. steel fiber reinforced concrete according to claim 1, which is characterized in that the moisture content of the river sand is less than 2%；
The granularity is that the moisture content of the rubble of 5~10mm is less than 2%.
6. steel fiber reinforced concrete according to claim 1, which is characterized in that the river sand is selected from middle sand；
Mountain flour mass content is not more than 4% in the middle sand；Clay content is not more than 0.5%.
7. steel fiber reinforced concrete according to claim 1, which is characterized in that needle in the rubble that the granularity is 5~10mm
Sheet mass content is not more than 5%, and clay content is not more than 0.5%.
8. steel fiber reinforced concrete according to claim 1, which is characterized in that the portland cement is that PO42.5 is common
Portland cement, glue sand compression strength is not less than 48MPa within 28 days.
9. the preparation method of steel fiber reinforced concrete, includes the following steps described in a kind of claim 1~8 any one：
River sand, rubble, the portland cement that granularity is 5~10mm are first mixed, steel fibre is then added, mixes, obtains first
Mixture；
Methyl ethyl ketone peroxide, cobalt iso-octoate and cementitious material are mixed, the second mixture is obtained；
Second mixture is added in the first mixture, is stirred evenly, the steel fibre of the emergent repairing of low shrinkage anti-crack is obtained
Concrete.
10. a kind of method on steel fiber reinforced concrete repairing road surface, includes the following steps：
Road surface to be repaired is pre-processed, reserved construction joint is arranged with template, obtains pretreatment road surface；
Steel fibre coagulation prepared by steel fiber reinforced concrete described in claim 1~8 any one or claim 9 preparation method
Soil is poured to pretreatment road surface, is vibrated, is then smoothed out, and after standing 30~40min, takes out template, is poured in reserved construction joint
Mortar, plug and pound it is closely knit, stand 1~3 hour, complete the repairing on road surface.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110723950A (en) * | 2019-10-29 | 2020-01-24 | 上海贝恒人居建设集团南通有限公司 | PC repairing material for PC member large repairing surface |
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| CN106830814A (en) * | 2016-11-29 | 2017-06-13 | 广东工业大学 | A kind of rapid hardening quick hardening early strength pavement patching concrete and preparation method thereof |
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| CN103964787A (en) * | 2014-05-09 | 2014-08-06 | 合肥工业大学 | Concrete with large doped quantity of mixed steel fibers and preparing method |
| CN107117918A (en) * | 2016-02-25 | 2017-09-01 | 张彬 | A kind of quick setting and rapid hardening ungauged regions disturbance rejection self-compacting concrete and preparation method thereof |
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Application publication date: 20180720 |