CN111484281A - Durable anti-cracking commercial concrete and preparation method thereof - Google Patents
Durable anti-cracking commercial concrete and preparation method thereof Download PDFInfo
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- CN111484281A CN111484281A CN202010176454.XA CN202010176454A CN111484281A CN 111484281 A CN111484281 A CN 111484281A CN 202010176454 A CN202010176454 A CN 202010176454A CN 111484281 A CN111484281 A CN 111484281A
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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
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1062—Metals
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/38—Electroplating: Baths therefor from solutions of copper
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
- C25D7/0607—Wires
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to durable anti-cracking commercial concrete which comprises the following components in parts by weight: 370 parts of cement 190-containing material, 170 parts of water 110-containing material, 25-75 parts of fly ash, 60-110 parts of mineral powder, 750 parts of fine aggregate 470-containing material, 1100 parts of coarse aggregate 950-containing material, 20-50 parts of light aggregate composition, 2-12 parts of steel fiber, 2-7 parts of epoxy resin, 3.5-8.5 parts of water reducer, and the light aggregate composition comprises the following components: 15-30 parts of sponge rubber particles and 5-20 parts of lightweight aggregate; the preparation method comprises the following steps: s1: uniformly mixing lightweight aggregate and sponge rubber particles to obtain a lightweight aggregate composition; s2: firstly, adding epoxy resin into water and stirring, then adding the lightweight aggregate composition and the steel fibers in the step S1 into the water and stirring; and finally adding cement, fly ash, mineral powder, fine aggregate, coarse aggregate and a water reducing agent, and stirring to obtain the durable anti-cracking commercial concrete. The durable anti-cracking commercial concrete has the advantages of strong anti-cracking performance and capability of improving the durability of the concrete.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to durable anti-cracking commercial concrete and a preparation method thereof.
Background
Commercial concrete refers to concrete that is used for commercial purposes, such as being sold or purchased. Commercial concrete is mostly used in the existing building construction. With the increase of the investment of the infrastructure in China, the application of the concrete is more and more extensive, and the service life of the building constructed by the concrete material is directly related to the durability of the concrete.
The crack resistance of concrete is one of the key factors influencing the durability of a concrete structure, cracks often appear in an actual concrete engineering structure, when the width of the cracks exceeds a certain limit, the bearing capacity, the rigidity and the normal use of the concrete member are influenced, a path is provided for the permeation of chloride ions, sulfate ions and other ions, the corrosion to the concrete is accelerated, and meanwhile, the corrosion of reinforcing steel bars in the concrete is aggravated.
Therefore, the crack resistance of the concrete is poor, so that the surface of the concrete structure is cracked and peeled off when the crack resistance is low, the appearance of the surface of the concrete structure is influenced, the strength and the bearing capacity of the concrete are reduced when the crack resistance is low, the service life of the concrete structure is shortened, the concrete structure is damaged and collapsed, and the life and property safety of people is threatened seriously. Therefore, the research on the concrete with better crack resistance is of great significance.
Disclosure of Invention
In view of the deficiencies of the prior art, it is an object of the present invention to provide a durable crack resistant commercial concrete having the effect of improving the crack resistance of the concrete.
The technical purpose of the invention is realized by the following technical scheme:
the durable anti-cracking commercial concrete comprises the following components in parts by weight: 370 parts of cement 190-containing material, 170 parts of water 110-containing material, 25-75 parts of fly ash, 60-110 parts of mineral powder, 750 parts of fine aggregate 470-containing material, 1100 parts of coarse aggregate 950-containing material, 20-50 parts of light aggregate composition, 2-12 parts of steel fiber, 2-7 parts of epoxy resin, 3.5-8.5 parts of water reducer, and the light aggregate composition comprises the following components: 15-30 parts of sponge rubber particles and 5-20 parts of lightweight aggregate, wherein the sponge rubber particles are formed by crushing sponge rubber.
By adopting the technical scheme, the addition of the admixture of the fly ash and the mineral powder replaces part of cement, so that the using amount of the cement is reduced, the hydration heat of the concrete can be reduced, the temperature change process of the concrete is relatively stable, and the risk of cracking of the concrete due to temperature difference is reduced. Meanwhile, the fly ash and the mineral powder are mixed to promote the secondary hydration reaction of the concrete, so that more water is needed to ensure the secondary hydration of the fly ash and the mineral powder, the self-shrinkage of the concrete is aggravated, the internal cracking of the concrete is serious, the light aggregate composition consisting of the sponge rubber particles and the light aggregate can absorb a large amount of water, the internal humidity of the concrete is improved, enough water is provided for the secondary hydration reaction, the dry cracking caused by insufficient water supply in the concrete is inhibited, the internal cracking of the concrete is reduced, the anti-cracking performance and the compactness of the concrete are improved, and the durability of the concrete is improved.
The lightweight aggregate has high porosity, so that the strength of the lightweight aggregate is lower than that of the common aggregate, the lightweight aggregate is easy to crack after being pressurized, and the compressive strength and the flexural strength of the concrete are easy to reduce when the lightweight aggregate is added into a concrete mixture, so that the durability of the concrete is reduced.
The sponge rubber particles have a porous structure, can adsorb certain moisture, and are matched with the lightweight aggregate to further improve the humidity inside the concrete. Meanwhile, the particle size of the sponge rubber particles is small, and the sponge rubber particles can be mixed with the lightweight aggregate to fill large pores in the lightweight aggregate, so that the internal structure of the lightweight aggregate is improved while the water absorption is not influenced, and the strength of the lightweight aggregate is increased. On the other hand, the sponge rubber particles have certain elasticity, and are distributed in the lightweight aggregate, so that the stress concentration in the lightweight aggregate can be relieved, the cracking condition of the lightweight aggregate is reduced, the strength of the lightweight aggregate is further increased, and the crack resistance and the compressive strength of concrete are improved.
In addition, the surface of the lightweight aggregate is rough and porous, the surface of the lightweight aggregate is in a low water-cement ratio due to the water absorption effect of the lightweight aggregate, the surface bonding strength of the lightweight aggregate is improved, the sponge rubber particles can be adhered to the surface of the lightweight aggregate, when the lightweight aggregate is subjected to larger pressure, the sponge rubber particles can effectively play a role in releasing stress concentration, the expansion of cracks can be delayed, and the cracking resistance strength, the compressive strength and the breaking strength of concrete are improved.
The steel fiber can not be nodulized in the concrete, and the distribution is even to be three-dimensional in disorder to the distribution, after the crack appears in the concrete will appear or the crack appears, the steel fiber through with the bonding force transmission load of concrete matrix interface, reduce the tensile stress of crack edge concrete, thereby reach the effect that prevents the production and the development of crack, can reduce peeling off of concrete, improve the compressive strength and the fracture strength of concrete.
The interface bonding between the steel fiber and the concrete matrix is mainly physical, that is, mainly due to the transmission of friction shear force, when the concrete is damaged, the steel fiber is easily pulled out due to poor adhesion between the steel fiber and the concrete, thereby affecting the fracture resistance of the concrete. The epoxy resin has high bonding strength and easy viscosity adjustment, and the epoxy resin is added to fill the gap between the steel fiber and the concrete interface, so that the bonding property between the steel fiber and the concrete interface is improved, the condition that the steel fiber is pulled out is reduced, the condition that the concrete cracks is further reduced under the matching of the epoxy resin and the steel fiber, the anti-cracking performance of the concrete is improved, the invasion of harmful media is prevented, and the durability of the concrete is improved. In addition, the epoxy resin has oxidation resistance and corrosion resistance, has a certain interception effect on sulfate ions, reduces the diffusion effect of the sulfate ions in the concrete, and further improves the sulfate corrosion resistance of the concrete.
The present invention in a preferred example may be further configured to: the weight ratio of the sponge rubber particles to the lightweight aggregate is (2.5-3.5) to (1.2-1.8).
By adopting the technical scheme, the sponge rubber particles are matched with the lightweight aggregate, so that the inside of the concrete can keep better humidity, secondary hydration reaction of the fly ash and the mineral powder is facilitated, self-shrinkage of the concrete is inhibited, internal dry cracking of the concrete is prevented, internal defects of the concrete are reduced, and the anti-cracking performance of the concrete is improved. The sponge rubber can fill larger pores of the lightweight aggregate, so that the pore diameter of the lightweight aggregate is more uniform, the water absorption and moisture release of the lightweight aggregate are more regular, and the pre-wetting degree inside the concrete is improved. Meanwhile, the sponge rubber particles can be adhered to the surface of the lightweight aggregate, so that the pressure on the lightweight aggregate is relieved, the fragmentation of the lightweight aggregate is reduced, and the crack resistance of concrete is improved.
Tests show that when the weight ratio of the sponge rubber particles to the lightweight aggregate is (2.5-3.5) to (1.2-1.8), the prepared concrete has better crack resistance and compressive strength. The reason for this is probably that, when the sponge rubber particles are small, the sponge particles adhered to the surface of the lightweight aggregate are small, the cushioning effect on the pressure applied to the lightweight aggregate is small, and the lightweight aggregate is easily broken when subjected to the pressure; when the number of the sponge rubber particles is large, a large number of the sponge rubber particles are adhered to the surface of the lightweight aggregate, so that although the strength of the lightweight aggregate is enhanced, the contact area of the lightweight aggregate and cementing materials such as cement is reduced, the bonding strength of the lightweight aggregate and concrete is poor, cracks are easily generated at the interface of the lightweight aggregate and the concrete, and the anti-cracking performance of the concrete is reduced.
The present invention in a preferred example may be further configured to: the lightweight aggregate is volcanic cinders, the average particle size is 4-8mm, and the apparent density is 2000kg/m3The water absorption is 10-12%.
By adopting the technical scheme, the volcanic cinders are natural light aggregate, can be obtained from local materials, and save the cost. The volcanic cinders are porous and rough in surface, so that the occluding force and the friction force between the volcanic cinders and concrete are increased, the interface bonding strength between the volcanic cinders and the concrete is improved, the concrete cannot be damaged along an interface when being subjected to larger pressure, and the generation of interface cracks is reduced, so that the crack resistance and the compressive strength of the concrete are improved, and the durability of the concrete is further improved.
The present invention in a preferred example may be further configured to: the sponge rubber particles are modified sponge rubber particles, and the modification method comprises the following steps: soaking the sponge rubber particles in 8-16% NaOH solution for 48 hours, washing with clear water until the washing liquid is neutral, and airing to obtain the modified sponge rubber particles.
By adopting the technical scheme, the surface of the sponge rubber particles can be adhered with additives such as aromatic oil, zinc stearate and the like in the production process, so that the adhesive force between the sponge rubber particles and concrete is influenced. Aromatic oil, zinc stearate and other additives on the surfaces of the sponge rubber particles modified by the NaOH solution are dissolved, so that the bonding force between the sponge rubber particles and concrete is enhanced, the compressive strength and the tensile strength of the concrete are further improved, and the durability of the concrete is further improved.
When the solubility of NaOH solution is lower, additive solubility such as aromatic oil to sponge rubber granule surface adhesion, zinc stearate is relatively poor, but when NaOH solution solubility is higher, because there is the residual of NaOH solute on the rubber granule surface, thereby make modified sponge rubber granule and concrete interface form local alkali environment, cause modified sponge rubber granule and concrete interface to appear the crack too early, be unfavorable for the bonding, and in cement hydration later stage, the alkali has the corrosive action to the set cement stone of sclerosis, be unfavorable for improving the intensity of concrete. Thus, NaOH solutions at concentrations of 8-16% are most effective.
The present invention in a preferred example may be further configured to: the average particle diameter of the modified sponge rubber particles is 1.5-2.5mm, and the density is 340-430kg/m3The water absorption is 55-75%.
By adopting the technical scheme, the average particle size of the modified sponge rubber particles is 1.5-2.5mm, so that larger pores of the lightweight aggregate can be conveniently filled, the pore diameter of the lightweight aggregate tends to be uniform, and the compressive strength of the lightweight aggregate is improved. In addition, the modified sponge rubber particles can be used for filling gaps of concrete, so that the compactness of the concrete can be increased, the effect of releasing stress concentration can be achieved, the extension of concrete cracks is delayed, and the compressive strength and the breaking strength of the concrete are improved.
The present invention in a preferred example may be further configured to: the steel fiber is rough-surface steel fiber, and the preparation method comprises the following steps:
a. after the surface of the steel wire is degreased, washing the steel wire with clean water until the washing liquid is neutral;
b. b, placing the steel wire in the step a into an electroplating bath containing copper, carrying out copper plating on the steel wire, and drying the steel wire after the copper plating is finished to obtain the steel wire with the roughness of more than 25 mu m;
c. and c, performing compression molding on the steel wire obtained in the step b and cutting to obtain the steel fiber with rough surface.
Through adopting above-mentioned technical scheme, the surperficial unevenness of the rough shaped steel fibre in surface increases the occlusal force and the frictional resistance of steel fibre and concrete, increases the joint strength of steel fibre and concrete, is convenient for transmit the load for the part that links to each other but not ftracture better through the bridging, increases the toughness of concrete to improve the tensile strength and the bending resistance ability of concrete.
The present invention in a preferred example may be further configured to: the coarse aggregate is crushed stone with the particle size of 12-20 mm.
Through adopting above-mentioned technical scheme, the coarse aggregate plays the effect of rigid skeleton in the concrete, and when the concrete bears the pressure load, its inside is by coarse aggregate transmission stress, improves the intensity of concrete, and less particle size rubble is relatively poor to the supporting role of concrete, and the load of bearing is less, can influence the mechanical properties and the durability of concrete. However, when the crushed stones with larger particle sizes are piled up, the porosity and the specific surface area are increased, so that the water absorption capacity of the aggregate surface is increased, the flowability of the concrete is influenced, and the flexural strength of the concrete is reduced
The present invention in a preferred example may be further configured to: the water reducing agent is a polycarboxylic acid water reducing agent.
By adopting the technical scheme, the polycarboxylic acid is a high-performance water reducing agent, is a cement dispersing agent in the application of cement concrete, can reduce the mixing water consumption under the condition of keeping the cement fluidity and the using amount unchanged, thereby reducing the water cement ratio, reducing the communicated pores formed by excessive cement hydration in the solidification process of the concrete, increasing the compactness of the concrete, improving the compressive strength of the concrete and further improving the durability of the concrete.
Object two of the present invention: the preparation method of the durable anti-cracking commercial concrete comprises the following steps:
s1: uniformly mixing lightweight aggregate and sponge rubber particles to obtain a lightweight aggregate composition;
s2: firstly, adding epoxy resin into water and uniformly stirring, and then adding the light aggregate composition and the steel fibers in the step S1 into the water and uniformly stirring; and finally, sequentially adding cement, fly ash, mineral powder, fine aggregate, coarse aggregate and a water reducing agent, and uniformly stirring to obtain the durable anti-cracking commercial concrete.
By adopting the technical scheme, the lightweight aggregate and the sponge rubber particles are mixed, so that the sponge rubber particles can be conveniently filled with the lightweight aggregate and are uniformly distributed around the lightweight aggregate. And then adding water and epoxy resin, so that the lightweight aggregate and the sponge rubber particles can absorb water in advance, and the epoxy resin can increase the bonding strength of the lightweight aggregate and the sponge rubber particles, so that the sponge rubber particles are bonded on the surface of the lightweight aggregate, and the pressure applied to the lightweight aggregate is buffered, thereby reducing the cracking condition of the lightweight aggregate and effectively improving the crack resistance of concrete.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the coal ash, the mineral powder and the light aggregate composition are matched for use, so that the hydration heat of cement is reduced, the temperature difference crack of concrete is avoided, the secondary hydration reaction of the coal ash and the mineral powder is promoted, the internal dry crack of the concrete can be avoided, the crack generated by the self-shrinkage of the concrete is reduced, and the crack resistance of the concrete is improved. The steel fiber and the epoxy resin can prevent the generation and the development of cracks and further improve the crack resistance and the fracture resistance of the concrete;
2. the light aggregate is matched with the sponge rubber particles, so that the strength of the light aggregate can be effectively increased, the cracking condition of the light aggregate is reduced, and the cracking resistance and the compression resistance of concrete are improved;
3. modified sponge rubber granule can fill the gap of concrete, increases the closely knit degree of concrete, can play the effect that the release stress concentrates with the steel fiber cooperation simultaneously, and in addition, epoxy can increase the adhesive strength of modified sponge rubber granule and concrete, reduces the interface crack of modified sponge rubber granule and concrete, improves the crack strength and the compressive strength of concrete.
Detailed Description
The present invention will be described in further detail with reference to examples.
In the following examples and comparative examples:
the cement is P.O42.5 ordinary portland cement produced by Yangquan Jidong cement factories;
the fly ash is grade II fly ash produced by Lihui mineral products Co., Ltd in Dongguan city;
the mineral powder is S95 mineral powder produced by Lihui mineral products Co., Ltd, Dongguan city;
the fine aggregate is natural sand produced by Yongxing stone factory of Shouyang, and the fineness modulus of the natural sand is 3.0-2.3;
the coarse aggregate is crushed stone produced by Yongxing stone factory of longevity Yang, and the particle size of the crushed stone is 12mm-20 mm;
sponge rubber was purchased from idel plastic materials ltd, yozhou;
the lightweight aggregate is volcanic cinders with the average particle size of 4-8mm, the volcanic cinders are taken from Simba area of Kenya, and the natural volcanic ash material is in porous cinders particle shape and is typical volcanic cinders;
the steel fiber is produced by Tianyi engineering fiber company Limited in Changzhou city;
epoxy resin was purchased from the chemical company, denlan hai, jenny;
the water reducing agent is a polycarboxylic acid water reducing agent produced by Shanxi Baichuan-sourced novel building materials Co.
Example 1
The durable anti-cracking commercial concrete comprises the following components in parts by weight: 190 parts of cement, 110 parts of water, 25 parts of fly ash, 60 parts of mineral powder, 470 parts of fine aggregate, 950 parts of coarse aggregate, 20 parts of light aggregate composition, 2 parts of steel fiber, 2 parts of epoxy resin and 3.5 parts of water reducer, wherein the light aggregate composition comprises the following components: 15 parts of sponge rubber particles and 5 parts of lightweight aggregate, wherein the sponge rubber particles are formed by crushing sponge rubber;
the preparation method of the durable anti-cracking commercial concrete comprises the following steps:
s1: uniformly mixing lightweight aggregate and sponge rubber particles to obtain a lightweight aggregate composition;
s2: firstly, adding epoxy resin into water and uniformly stirring, and then adding the light aggregate composition and the steel fibers in the step S1 into the water and uniformly stirring; and finally, sequentially adding cement, fly ash, mineral powder, fine aggregate, coarse aggregate and a water reducing agent, and uniformly stirring to obtain the durable anti-cracking commercial concrete.
Example 2
The durable anti-cracking commercial concrete comprises the following components in parts by weight: 280 parts of cement, 140 parts of water, 50 parts of fly ash, 85 parts of mineral powder, 610 parts of fine aggregate, 1025 parts of coarse aggregate, 35 parts of light aggregate composition, 7 parts of steel fiber, 4.5 parts of epoxy resin and 6 parts of water reducer, wherein the light aggregate composition comprises the following components: 22.5 parts of sponge rubber particles and 12.5 parts of lightweight aggregate, wherein the sponge rubber particles are formed by crushing sponge rubber;
the preparation method of the durable anti-cracking commercial concrete comprises the following steps:
s1: uniformly mixing lightweight aggregate and sponge rubber particles to obtain a lightweight aggregate composition;
s2: firstly, adding epoxy resin into water and uniformly stirring, and then adding the light aggregate composition and the steel fibers in the step S1 into the water and uniformly stirring; and finally, sequentially adding cement, fly ash, mineral powder, fine aggregate, coarse aggregate and a water reducing agent, and uniformly stirring to obtain the durable anti-cracking commercial concrete.
Example 3
The durable anti-cracking commercial concrete comprises the following components in parts by weight: 370 parts of cement, 170 parts of water, 75 parts of fly ash, 110 parts of mineral powder, 750 parts of fine aggregate, 1100 parts of coarse aggregate, 50 parts of light aggregate composition, 12 parts of steel fiber, 7 parts of epoxy resin and 8.5 parts of water reducer, wherein the light aggregate composition comprises the following components: 30 parts of sponge rubber particles and 20 parts of lightweight aggregate, wherein the sponge rubber particles are formed by crushing sponge rubber;
the preparation method of the durable anti-cracking commercial concrete comprises the following steps:
s1: uniformly mixing lightweight aggregate and sponge rubber particles to obtain a lightweight aggregate composition;
s2: firstly, adding epoxy resin into water and uniformly stirring, and then adding the light aggregate composition and the steel fibers in the step S1 into the water and uniformly stirring; and finally, sequentially adding cement, fly ash, mineral powder, fine aggregate, coarse aggregate and a water reducing agent, and uniformly stirring to obtain the durable anti-cracking commercial concrete.
Example 4
A durable cracking-resistant commercial concrete is different from the commercial concrete in example 2 in that in the lightweight aggregate composition, 23.6 parts by weight of the sponge rubber particles and 11.4 parts by weight of the lightweight aggregate are added, namely the weight ratio of the sponge rubber particles to the lightweight aggregate is 2.5: 1.2.
Example 5
A durable cracking-resistant commercial concrete is different from the commercial concrete in example 2 in that in the lightweight aggregate composition, 23.3 parts by weight of the sponge rubber particles and 11.7 parts by weight of the lightweight aggregate are added, namely the weight ratio of the sponge rubber particles to the lightweight aggregate is 3.0: 1.5.
Example 6
The durable cracking-resistant commercial concrete is different from the commercial concrete in example 2 in that in the lightweight aggregate composition, 23.1 parts by weight of the sponge rubber particles and 11.9 parts by weight of the lightweight aggregate are added, namely the weight ratio of the sponge rubber particles to the lightweight aggregate is 3.5: 1.8.
example 7
A durable anti-cracking commercial concrete is different from the commercial concrete in the embodiment 2 in that the same amount of modified sponge rubber particles are taken to replace the sponge rubber particles in the raw materials,
the method for modifying the sponge rubber particles comprises the following steps: soaking the sponge rubber particles in 8% NaOH solution for 48 hours, washing with clear water until the washing liquid is neutral, and airing to obtain the modified sponge rubber particles.
Example 8
A durable anti-cracking commercial concrete is different from the commercial concrete in the embodiment 2 in that the same amount of modified sponge rubber particles are taken to replace the sponge rubber particles in the raw materials,
the method for modifying the sponge rubber particles comprises the following steps: soaking the sponge rubber particles in a 12% NaOH solution for 48 hours, cleaning with clear water until the flushing fluid is neutral, and airing to obtain the modified sponge rubber particles.
Example 9
A durable anti-cracking commercial concrete is different from the commercial concrete in the embodiment 2 in that the same amount of modified sponge rubber particles are taken to replace the sponge rubber particles in the raw materials,
the method for modifying the sponge rubber particles comprises the following steps: soaking the sponge rubber particles in a 16% NaOH solution for 48 hours, cleaning with clear water until the flushing fluid is neutral, and airing to obtain the modified sponge rubber particles.
Example 10
The difference between the durable anti-cracking commercial concrete and the embodiment 2 is that in the raw materials, the same amount of rough-surface steel fibers are used for replacing steel fibers, wherein the preparation method of the rough-surface steel fibers comprises the following steps:
a. after the surface of the steel wire is degreased, washing the steel wire with clean water until the washing liquid is neutral;
b. b, placing the steel wire in the step a into an electroplating bath containing copper, carrying out copper plating on the steel wire, and drying the steel wire after the copper plating is finished to obtain the steel wire with the roughness of more than 25 mu m;
c. and c, performing compression molding on the steel wire obtained in the step b and cutting to obtain the steel fiber with rough surface.
Comparative example 1
A durable cracking-resistant commercial concrete, which is different from that of example 5 in that the weight portion of the lightweight aggregate composition is 24 portions of sponge rubber particles and 11 portions of lightweight aggregate, i.e., the weight ratio of the sponge rubber particles to the lightweight aggregate is 2.2: 1.0.
Comparative example 2
A durable cracking-resistant commercial concrete is different from the commercial concrete in example 5 in that in the lightweight aggregate composition, by weight, 22.9 parts of sponge rubber particles and 12.1 parts of lightweight aggregate are included, namely, the weight ratio of the sponge rubber particles to the lightweight aggregate is 3.8: 2.0.
Comparative example 3
A durable, crack resistant commercial concrete, which differs from example 2 in that no lightweight aggregate composition is added to the above raw materials.
Comparative example 4
The difference between the durable anti-cracking commercial concrete and the concrete in the example 2 is that the same amount of ceramsite is used for replacing volcanic cinders in parts by weight.
Performance detection
The properties of the concrete of examples 1 to 10 and comparative examples 1 to 4 were measured by the following methods.
① early crack resistance, preparing standard test blocks according to GB/T50081-2016 Standard test method for mechanical Properties of ordinary concrete, calculating the number of cracks in unit area and the total area of cracks in unit area measured 24h after pouring concrete.
② bending strength, preparing standard test block according to GB/T50081-2016 standard for testing mechanical properties of common concrete, and measuring bending strength of standard test block maintained for 7d and 28 d.
③ compressive strength, preparing standard test block according to GB/T50081-2016 standard for testing mechanical properties of common concrete, and measuring compressive strength of standard test block maintained for 7 days and 28 days.
④ resistance to chloride ion penetration, testing the chloride ion penetration depth of the standard test block according to the rapid chloride ion migration coefficient method in GB/T50082-2009 Standard test method for testing the long-term performance and durability of ordinary concrete.
The concrete test results for examples 1 to 10 and comparative examples 1 to 4 are shown in Table 1.
TABLE 1 concrete durability test data
From table 1 it can be derived:
compared with the comparative examples 1 to 4, the early crack resistance, the breaking strength, the compressive strength and the chloride ion permeability of the concrete in the examples 1 to 10 are all superior to those of the comparative examples 1 to 4, which shows that the mutual relationship among the concrete formulas of the invention is scientific and reasonable, the crack resistance and the compressive performance of the concrete can be effectively improved, the chloride ion corrosion resistance of the concrete can be improved, the performance of the concrete is improved on the whole, and the durability of the concrete is improved.
Compared with the comparative example 3, the early crack resistance, the breaking strength, the compressive strength and the chloride ion permeability of the concrete in the examples 1 to 3 are all superior to those of the comparative example 3, which shows that the addition of the lightweight aggregate composition can improve the moisture retention degree in the concrete, ensure the moisture required by the secondary hydration reaction of the fly ash and the mineral powder, inhibit the internal dry cracking of the concrete and improve the crack resistance of the concrete, thereby preventing harmful media from invading into the concrete and improving the durability of the concrete.
It can be seen from the combination of examples 1-3 and comparative example 4 that, after the volcanic cinders are replaced by the ceramsite, the early crack resistance, the breaking strength, the compressive strength and the chloride ion permeability of the concrete are all reduced, which indicates that the occlusion force and the friction force of the volcanic cinders and the concrete are stronger, the interface bonding strength with the concrete is improved, and the generation of interface cracks is reduced, so that the crack resistance and the compressive strength of the concrete are improved, and the durability of the concrete is further improved.
Compared with the concrete in the embodiment 2 and the comparative example 1-2, the concrete in the embodiment 4-6 has various performances superior to those of the concrete in the embodiment 2 and the comparative example 1-2, and the weight ratio of the sponge rubber particles to the lightweight aggregate is (2.5-3.5) - (1.2-1.8), so that the proportion of the sponge rubber particles to the lightweight aggregate is more reasonable, the sponge rubber particles and the lightweight aggregate are better matched with each other, and the early crack resistance, the flexural strength, the compressive strength and the chloride ion permeability of the concrete are improved.
Compared with the example 5, the early cracking resistance, the breaking strength, the compressive strength and the chloride ion permeability of the concrete in the examples 7 to 9 are all superior to those of the example 5, which shows that the sponge rubber particles can increase the adhesion with the concrete after being modified, better disperse the pressure applied to the concrete, obviously improve the breaking strength, the compressive strength and the early cracking resistance of the concrete, and further improve the durability of the concrete.
Compared with the example 2, the early crack resistance, the breaking strength, the compressive strength and the chloride ion permeability of the concrete in the example 10 are all superior to those of the example 2, which shows that the steel fibers can increase the bonding strength with the concrete after being subjected to surface roughness treatment, thereby being beneficial to improving the performances of the concrete such as crack resistance, breaking resistance and the like and improving the durability of the concrete.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. A durable crack-resistant commercial concrete is characterized in that: the coating comprises the following components in parts by weight: 370 parts of cement 190-containing material, 170 parts of water 110-containing material, 25-75 parts of fly ash, 60-110 parts of mineral powder, 750 parts of fine aggregate 470-containing material, 1100 parts of coarse aggregate 950-containing material, 20-50 parts of light aggregate composition, 2-12 parts of steel fiber, 2-7 parts of epoxy resin, 3.5-8.5 parts of water reducer, and the light aggregate composition comprises the following components: 15-30 parts of sponge rubber particles and 5-20 parts of lightweight aggregate, wherein the sponge rubber particles are formed by crushing sponge rubber.
2. The durable crack-resistant commercial concrete according to claim 1, wherein: the weight ratio of the sponge rubber particles to the lightweight aggregate is (2.5-3.5) to (1.2-1.8).
3. The durable crack-resistant commercial concrete according to claim 1, wherein: the lightweight aggregate is volcanic cinders, and the average particle size is 4-8 mm.
4. The durable crack-resistant commercial concrete according to claim 1, wherein: the sponge rubber particles are modified sponge rubber particles, and the modification method comprises the following steps: soaking the sponge rubber particles in 8-16% NaOH solution for 48 hours, washing with clear water until the washing liquid is neutral, and airing to obtain the modified sponge rubber particles.
5. The durable crack-resistant commercial concrete according to claim 4, wherein: the average particle diameter of the modified sponge rubber particles is 1.5-2.5mm, and the density is 340-430kg/m3The water absorption is 55-75%.
6. The durable crack-resistant commercial concrete according to claim 1, wherein: the steel fiber is rough-surface steel fiber, and the preparation method comprises the following steps:
a. after the surface of the steel wire is degreased, washing the steel wire with clean water until the washing liquid is neutral;
b. b, placing the steel wire in the step a into an electroplating bath containing copper, carrying out copper plating on the steel wire, and drying the steel wire after the copper plating is finished to obtain the steel wire with the roughness of more than 25 mu m;
c. and c, performing compression molding on the steel wire obtained in the step b and cutting to obtain the steel fiber with rough surface.
7. The durable crack-resistant commercial concrete according to claim 1, wherein: the coarse aggregate is crushed stone with the particle size of 12-20 mm.
8. The durable crack-resistant commercial concrete according to claim 1, wherein: the water reducing agent is a polycarboxylic acid water reducing agent.
9. A method of making a durable crack resistant commercial concrete according to any one of claims 1 to 8, comprising the steps of:
s1: uniformly mixing lightweight aggregate and sponge rubber particles to obtain a lightweight aggregate composition;
s2: firstly, adding epoxy resin into water and uniformly stirring, and then adding the light aggregate composition and the steel fibers in the step S1 into the water and uniformly stirring; and finally, sequentially adding cement, fly ash, mineral powder, fine aggregate, coarse aggregate and a water reducing agent, and uniformly stirring to obtain the durable anti-cracking commercial concrete.
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