CN112250377A - Fair-faced concrete and production process thereof - Google Patents
Fair-faced concrete and production process thereof Download PDFInfo
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- CN112250377A CN112250377A CN202011001116.9A CN202011001116A CN112250377A CN 112250377 A CN112250377 A CN 112250377A CN 202011001116 A CN202011001116 A CN 202011001116A CN 112250377 A CN112250377 A CN 112250377A
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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
- 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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Abstract
The application relates to the technical field of concrete, and particularly discloses fair-faced concrete and a production process thereof. The fair-faced concrete is mainly prepared from the following raw materials in parts by weight: 150-165 parts of cement, 430-450 parts of fine aggregate, 260-280 parts of coarse aggregate, 75-80 parts of zeolite powder, 2-5 parts of water reducing agent and 65-78 parts of water; the fine aggregate consists of natural sand, fine particle regenerated aggregate and machine-made sand in a weight ratio of 6-8:8-12:15-18, and the fine particle regenerated aggregate is made of construction waste. The fair-faced concrete has the advantages of good appearance quality, high strength, greatly reduced number of cracks on the surface of the concrete, greatly reduced cost and good comprehensive performance.
Description
Technical Field
The application relates to the technical field of concrete, in particular to fair-faced concrete and a production process thereof.
Background
The clear water concrete is a special concrete in concrete, is directly formed by one step by utilizing the concrete, utilizes the natural texture of the concrete and does not need to be coated with a protective coating. The surface is clean and natural, and the product can meet the requirements of various building shapes and has good decorative effect. The surface of the fair-faced concrete is required to be flat and smooth, uniform in color and luster and clear in edges and corners, so that the requirements on the raw materials, the proportion and the construction process of the concrete are high.
At present, in order to meet the construction requirements of pouring or spraying, a lot of fair-faced concrete is more filled with the proportion between the raw materials of heavy concrete to achieve proper fluidity, but most of the concrete is exposed in the external natural environment in the using process, and along with the time lapse, the concrete is easily corroded to generate surface defects or cracks under the environmental destruction, so that the decorative effect of the fair-faced concrete is reduced.
In order to solve the problems, the Chinese patent with application publication number CN109503071A discloses a fair-faced concrete which comprises the following components in parts by weight: 7.5-10 parts of water; 15-20 parts of Portland cement; 45-60 parts of sand; 60-80 parts of stone; 0.75-1 part of water reducing agent; 3-4 parts of carbon fiber; 10.5-14 parts of rubber emulsion; 3.75-5 parts of a silane coupling agent. The clear water concrete is not easy to cause surface quality problems, and has long service life.
In view of the above-mentioned related technologies, the inventors believe that the crack resistance of the fair-faced concrete still needs to be improved, and the cost is high.
Disclosure of Invention
The application provides the fair-faced concrete and the production process thereof in order to obtain the fair-faced concrete with better crack resistance at lower cost.
In a first aspect, the bare concrete provided by the application adopts the following technical scheme:
the fair-faced concrete is mainly prepared from the following raw materials in parts by weight: 150-165 parts of cement, 430-450 parts of fine aggregate, 260-280 parts of coarse aggregate, 75-80 parts of zeolite powder, 2-5 parts of water reducing agent and 65-78 parts of water; the fine aggregate consists of natural sand, fine particle regenerated aggregate and machine-made sand in a weight ratio of 6-8:8-12:15-18, and the fine particle regenerated aggregate is made of construction waste.
Through adopting above-mentioned technical scheme, the thin aggregate in the clear water concrete's of this application raw materials has adopted natural sand, the granule regeneration is gathered materials and the mechanism sand is constituteed, wherein, the hardness of natural sand is great, can improve the intensity of clear water concrete, and the colour of natural sand is abundant moreover, and the appearance is natural, can make the decorative of clear water concrete obtain promoting, and the granularity of mechanism sand is comparatively homogeneous, is favorable to improving the homogeneity of clear water concrete's mechanical properties, and then has reduced the cracked probability of concrete appearance. On the basis that the mechanical property and the decorativeness of natural sand and machine-made sand can be fully guaranteed, a certain amount of regenerated aggregate is added, the cost of the fine aggregate is reduced on the basis of guaranteeing the overall mechanical property of the fine aggregate, and the overall cost of the fair-faced concrete is further reduced. The zeolite powder is added into the raw materials, and the zeolite powder has better binding capacity with other raw materials such as cement and the like, so that the strength of the fair-faced concrete can be improved.
Preferably, the fair-faced concrete is mainly prepared from the following raw materials in parts by weight: 155 portions of cement, 435 portions of fine aggregate, 450 portions of coarse aggregate, 270 portions of coarse aggregate, 75-78 portions of zeolite powder, 3-5 portions of water reducing agent and 70-78 portions of water; the fine aggregate consists of natural sand, fine particle regenerated aggregate and machine-made sand in a weight ratio of 6-8:8-12:15-18, and the fine particle regenerated aggregate is made of construction waste.
By adopting the technical scheme, the proportion of each raw material of the fair-faced concrete is properly adjusted and optimized, so that each raw material is better matched and plays a role.
Preferably, the zeolite powder has a specific surface area of 300-550m2/kg。
By adopting the technical scheme, the specific surface area of the limited zeolite powder is larger, the zeolite powder with the specific surface area has higher porosity and stronger adsorbability, can have stronger binding force with other raw materials such as cement and the like, is convenient for forming concrete with higher uniformity, and is also favorable for improving the overall strength of the concrete.
Preferably, the raw material also comprises 28-35 parts by weight of mullite powder.
By adopting the technical scheme, the mullite powder is added into the raw materials and is distributed in gaps among the aggregates, so that the expansion and contraction amplitude of the concrete during temperature change is reduced.
Preferably, the raw material further comprises 3 to 5 parts by weight of rubber particles.
By adopting the technical scheme, a certain amount of rubber particles are added into the raw materials, so that the shrinkage of concrete caused by the change of the concrete mixing degree can be buffered, the stress concentration in the concrete is reduced, and the probability of cracks of the concrete is further reduced.
Preferably, the raw material further comprises 12-15 parts by weight of hollow glass microspheres.
By adopting the technical scheme, the hollow glass beads are added into the raw materials, so that the density of the concrete can be reduced while the concrete has higher strength, and the transportation and construction are convenient.
Preferably, the construction waste is composed of concrete waste and clay brick waste according to a weight ratio of 4-5: 1.
By adopting the technical scheme, the construction waste is formed by mixing the concrete waste and the clay brick waste, the concrete waste can be fully utilized as the waste aggregate, the good water absorption of the clay brick waste can be utilized, a certain amount of water is stored in the concrete, and the shrinkage rate of the concrete in water loss is reduced.
In a second aspect, the production process of the fair-faced concrete provided by the application adopts the following technical scheme:
the production process of the fair-faced concrete comprises the following steps:
1) mixing cement, zeolite powder and water uniformly to prepare cement paste;
uniformly mixing the coarse aggregate and cement paste to prepare premix;
2) and (3) uniformly mixing the premix, the fine aggregate and the water reducing agent to obtain the water reducing agent.
By adopting the technical scheme, cement, zeolite powder and water are uniformly mixed to prepare cement paste, the cement and the zeolite powder can be fully mixed by utilizing the adsorbability of the zeolite powder, and are uniformly dispersed in water, and then when the cement paste is uniformly mixed with the coarse aggregate, the cement paste can be wrapped and covered on the surface of the coarse aggregate, so that the uniform mixing degree of the cement, the zeolite powder and the coarse aggregate is improved.
Preferably, the step 1) of uniformly mixing the cement, the zeolite powder and the water is to uniformly mix the cement and the zeolite powder in a dry mixing manner, and then uniformly mix the mixture with the water to obtain the cement slurry.
By adopting the technical scheme, the cement and the zeolite powder are mixed uniformly in a dry mixing manner, so that cement fine particles can be uniformly adsorbed on a porous structure of the zeolite powder in the dry mixing manner, and the phenomenon that water fills pores of the zeolite powder when the zeolite powder is mixed with water firstly to prevent the cement particles from being combined with the zeolite powder is reduced.
Preferably, the coarse aggregate and the cement slurry are uniformly mixed in the step 1), and the mixture is stirred for 1-2min at the rotating speed of 80-100 rpm.
By adopting the technical scheme, the stirring speed is adopted when the coarse aggregate is mixed with the cement paste, so that the shearing force during high-speed stirring can be reduced to scrape the cement paste on the surface of the coarse aggregate, and the cement paste can be ensured to be fully soaked and covered on the surface of the coarse aggregate.
In summary, the present application has the following beneficial effects:
1. the fine aggregate of the fair-faced concrete adopts the mixed fine aggregate consisting of the natural sand, the fine particle regenerated aggregate and the mechanism sand, and on the basis of ensuring the strength of the concrete and reducing cracks by utilizing the natural sand and the mechanism sand, the production cost of the concrete is reduced and the environmental protection is facilitated.
2. Mullite powder and rubber particles are added into the raw materials of the fair-faced concrete, so that stress concentration of the concrete under the influence of environmental temperature change can be reduced, and cracks in the concrete are reduced.
Detailed Description
The present application will be described in further detail with reference to examples.
The clear water concrete is mainly prepared from the following raw materials in parts by weight: 150-165 parts of cement, 430-450 parts of fine aggregate, 260-280 parts of coarse aggregate, 75-80 parts of zeolite powder, 2-5 parts of water reducing agent and 65-78 parts of water; the fine aggregate consists of natural sand, fine particle regenerated aggregate and machine-made sand in a weight ratio of 6-8:8-12:15-18, and the fine particle regenerated aggregate is made of construction waste.
Preferably, the fine aggregate is composed of natural sand, fine-grained reclaimed aggregate and machine-made sand in a weight ratio of 7:10: 16. The particle sizes of the natural sand and the fine regenerated aggregate are both 0.6-1.18mm, and the particle size of the machine-made sand is 0.075-0.3 mm.
Preferably, the raw materials also comprise 15 to 22 parts of polyurethane prepolymer. The raw material also comprises 3-8 parts by weight of dimethylolpropionic acid. The raw material also comprises 22-30 parts by weight of reinforcing fiber. The raw material also comprises 15-18 parts by weight of basic aluminum carbonate. The raw materials also comprise 15-20 parts by weight of VAE emulsion.
The polyurethane prepolymer is prepared by the polymerization reaction of toluene-2, 4-diisocyanate and polypropylene glycol, and the molar ratio of isocyanic acid group in the toluene-2, 4-diisocyanate to hydroxyl group in the polypropylene glycol is 1-2:1 during the reaction. Preferably, the molar ratio of isocyanate groups in toluene-2, 4-diisocyanate to hydroxyl groups in polypropylene glycol is 2: 1.
Preferably, the zeolite powder has a particle size of 10 to 15 μm. Specific surface area of 400-550m2In terms of/kg. Preferably 540m2In terms of/kg. The grain diameter of the mullite powder is 150-300 mu m. Preferably 150 μm.
Preferably, the coarse aggregate is formed by mixing fluxant and coarse-grained reclaimed aggregate according to the weight ratio of 1: 1-2. The particle size of the flux limestone macadam and the coarse grain regenerated aggregate is 2.36-4.75 mm. The coarse grain regeneration aggregate is oversize material obtained by crushing concrete waste and sieving the crushed concrete waste in a cylindrical sieve at the rotating speed of 300-500rpm for 20-30 min.
Preferably, the reinforcing fibers are bamboo fibers. The length of the bamboo fiber is 5 mm. The VAE emulsion had a solids content of 54.7% and a viscosity of 3700 mPas.
Preferably, the rubber particles are 0.5 mm. The hollow glass microspheres have an average particle size of 65 μm and a density of 0.2g/cm3。
Preferably, the raw material also comprises 1-2 parts by weight of polyacrylamide. The particle size of the polyacrylamide was 150. mu.m.
Preferably, the raw material also comprises 15-18 parts by weight of basic aluminum acetate. The particle size of the basic aluminum acetate is 4.75-9.5 mm.
The production process of the fair-faced concrete comprises the following steps:
1) mixing cement, zeolite powder and water uniformly to prepare cement paste;
uniformly mixing the coarse aggregate and cement paste to prepare premix;
2) and (3) uniformly mixing the premix, the fine aggregate and the water reducing agent to obtain the water reducing agent.
The step 1) of uniformly mixing the cement, the zeolite powder and the water is to uniformly dry-mix the cement and the zeolite powder, and then uniformly mix the mixture with the water to obtain the cement paste. The cement and the zeolite powder are mixed evenly by dry stirring for 3-5 min. Then mixing with water and stirring at the rotation speed of 120-.
In the step 1), the coarse aggregate and the cement paste are uniformly mixed and stirred for 1-2min at the rotating speed of 80-100 rpm.
In the step 2), the premix is uniformly mixed with the fine aggregate and the water reducing agent, namely, the natural sand, the fine particle regenerated aggregate and the machine-made sand are uniformly mixed to prepare the fine aggregate, and then the premix is uniformly mixed with the fine aggregate and the water reducing agent. The natural sand, the fine particle regenerated aggregate and the machine-made sand are uniformly mixed, namely the natural sand, the fine particle regenerated aggregate and the machine-made sand are dry-mixed for 2-3min to obtain the fine aggregate.
Further preferably, the fine aggregate, the premix and the water reducing agent are uniformly mixed, and the fine aggregate and the VAE emulsion are uniformly mixed firstly and then are mixed with the premix and the water reducing agent. The fine aggregate was mixed well with the VAE emulsion and stirred at 60rpm for 2 min. Further preferably, rubber particles, a polyurethane prepolymer, and dimethylolpropionic acid are further added when the fine aggregate is mixed with the VAE emulsion. Further preferably, hollow glass beads are also added.
The fine particle reclaimed aggregate is prepared by a method comprising the following steps: crushing the concrete waste, then sieving for 15-25min in a cylindrical sieve at the rotating speed of 800-. Further preferably, the fine regenerated aggregate is obtained by crushing the concrete waste and the clay brick waste respectively, and then adding the crushed materials into a cylindrical sieve according to the weight ratio of 2-3:1 and sieving the undersize materials obtained by sieving at the rotating speed of 800-. Further preferably, the fine regenerated aggregate is obtained by crushing the concrete waste and the clay brick waste respectively, and then adding the crushed materials into a cylindrical sieve according to the weight ratio of 3:1, and sieving the undersize materials obtained by sieving the materials for 15min at the rotating speed of 1000 rpm.
Preferably, the concrete waste and the clay brick waste are respectively crushed, then are added into a cylindrical sieve according to the weight ratio of 2-3:1, and are sieved for 15-25min at the rotating speed of 800-. Preferably, the concrete waste and the clay brick waste are respectively crushed, then added into a cylindrical sieve according to the weight ratio of 3:1, sieved at the rotating speed of 1000rpm for 15min to obtain a regenerated undersize product and a regenerated oversize product, the regenerated undersize product is sieved to obtain fine-particle regenerated aggregate, and the regenerated oversize product is sieved to obtain coarse-particle regenerated aggregate.
The coarse aggregate is formed by mixing fluxed limestone and coarse-grained reclaimed aggregate according to the weight ratio of 1: 1-2.
In the step 2), the premix, the fine aggregate and the water reducing agent are uniformly mixed and stirred for 3-5min at the rotating speed of 30-50 rpm. Further preferably, basic aluminum acetate is added when the premix, the fine aggregate and the water reducing agent are uniformly mixed. Further preferably, polyacrylamide is added when the premix, the fine aggregate and the water reducing agent are uniformly mixed.
Preferably, the cylindrical screen comprises a cylindrical screen mesh with a horizontal axis, and the cylindrical screen mesh is formed by weaving steel wires with a circular or rectangular cross section.
Example 1
The fair-faced concrete of the embodiment is prepared from the following raw materials in parts by weight: 150.0kg of cement, 430.0kg of fine aggregate, 260.0kg of coarse aggregate, 80.0kg of zeolite powder, 2.0kg of water reducing agent and 65kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The fine aggregate consists of natural sand, fine regenerated aggregate and machine-made sand in a weight ratio of 6:8:15, wherein the particle sizes of the natural sand and the fine regenerated aggregate are 0.6-1.18mm, and the particle size of the machine-made sand is 0.075-0.3 mm. The fine particle regenerated aggregate is obtained by crushing and screening concrete waste. The coarse aggregate is flux limestone broken stone with the grain diameter of 2.36-4.75 mm. The zeolite powder has a particle size of 15 μm and a specific surface area of 370m2In terms of/kg. The water reducing agent is a polycarboxylic acid water reducing agent.
The production process of the fair-faced concrete comprises the following steps:
1) crushing the concrete waste by using a crusher, then adding the crushed concrete waste into a cylindrical sieve with the aperture of 1.18mm, operating the cylindrical sieve at the rotating speed of 800rpm for 25min, discharging undersize, sieving by using a 0.6mm sieve, and taking oversize to obtain fine regenerated aggregate;
2) adding cement and zeolite powder into a stirrer, stirring for 5min, adding water, stirring at a rotating speed of 120rpm for 1min to prepare cement paste, adding coarse aggregate, and stirring at a rotating speed of 80rpm for 2min to obtain a premix;
3) adding natural sand, fine particle regenerated aggregate and machine-made sand into a stirrer, stirring for 3min to obtain fine aggregate, adding the fine aggregate and a water reducing agent into the premix prepared in the step 2), and stirring for 5min at the rotating speed of 30rpm to obtain the material.
Example 2
The fair-faced concrete of the embodiment is prepared from the following raw materials in parts by weight: 155.0kg of cement, 435.0kg of fine aggregate, 270.0kg of coarse aggregate, 75.0kg of zeolite powder, 28.0kg of mullite powder, 15.0kg of VAE emulsion, 3.0kg of water reducing agent and 70.0kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The fine aggregate consists of natural sand, fine regenerated aggregate and machine-made sand in a weight ratio of 8:12:18, wherein the particle sizes of the natural sand and the fine regenerated aggregate are 0.6-1.18mm, and the particle size of the machine-made sand is 0.075-0.3 mm. The fine particle regenerated aggregate is obtained by crushing and screening concrete waste. The coarse aggregate is flux limestone broken stone with the grain diameter of 2.36-4.75 mm. The zeolite powder has a particle size of 15 μm and a specific surface area of 370m2In terms of/kg. The grain diameter of the mullite powder is 150 mu m. The VAE emulsion had a solids content of 54.7% and a viscosity of 3700 mPas. The water reducing agent is a polycarboxylic acid water reducing agent.
The production process of the fair-faced concrete comprises the following steps:
1) crushing the concrete waste by using a crusher, then adding the crushed concrete waste into a cylindrical sieve with the aperture of a sieve pore of 1.18mm, operating the cylindrical sieve at the rotating speed of 900rpm for 20min, discharging undersize, sieving by using a 0.6mm sieve, and taking oversize to obtain fine regenerated aggregate;
2) adding cement, zeolite powder and mullite powder into a stirrer, stirring for 4min, adding water, stirring at the rotating speed of 135rpm for 1.5min to prepare cement paste, adding coarse aggregate, and stirring at the rotating speed of 90rpm for 2min to obtain a premix;
3) adding natural sand, fine particle regenerated aggregate and machine-made sand into a stirrer, stirring for 2min to obtain fine aggregate, adding VAE emulsion, and stirring at the rotating speed of 60rpm for 2min to obtain a fine material mixture;
adding the fine material mixture and the water reducing agent into the premix prepared in the step 2), and stirring at the rotating speed of 30rpm for 5min to obtain the premix.
Example 3
The fair-faced concrete of the embodiment is prepared from the following raw materials in parts by weight: 155.0kg of cement, 435.0kg of fine aggregate, 270.0kg of coarse aggregate, 75.0kg of zeolite powder, 30.0kg of mullite powder, 3.0kg of rubber particles, 15.0kg of polyurethane prepolymer, 3.0kg of dimethylolpropionic acid, 15.0kg of VAE emulsion, 3.0kg of water reducing agent and 70.0kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The fine aggregate consists of natural sand, fine regenerated aggregate and machine-made sand in a weight ratio of 7:10:16, wherein the particle sizes of the natural sand and the fine regenerated aggregate are 0.6-1.18mm, and the particle size of the machine-made sand is 0.075-0.3 mm. The fine particle regenerated aggregate is obtained by crushing and screening concrete waste. The coarse aggregate is flux limestone broken stone with the grain diameter of 2.36-4.75 mm. The zeolite powder has a particle size of 15 μm and a specific surface area of 370m2In terms of/kg. The grain diameter of the mullite powder is 300 mu m. The rubber particle was 0.5 mm. The polyurethane prepolymer is prepared by the polymerization reaction of toluene-2, 4-diisocyanate and polypropylene glycol, and the molar ratio of isocyanic acid group in the toluene-2, 4-diisocyanate to hydroxyl group in the polypropylene glycol is 2:1 during the reaction. The VAE emulsion had a solids content of 54.7% and a viscosity of 3700 mPas. The water reducing agent is a polycarboxylic acid water reducing agent.
The production process of the fair-faced concrete comprises the following steps:
1) crushing the concrete waste by using a crusher, then adding the crushed concrete waste into a cylindrical sieve with the aperture of a sieve pore of 1.18mm, operating the cylindrical sieve at the rotating speed of 1000rpm for 15min, discharging undersize, sieving by using a 0.6mm sieve, and taking oversize to obtain fine regenerated aggregate;
2) adding cement, zeolite powder and mullite powder into a stirrer, stirring for 3min, adding water, stirring at the rotating speed of 150rpm for 1min to prepare cement paste, adding coarse aggregate, and stirring at the rotating speed of 100rpm for 1min to obtain a premix;
3) adding natural sand, fine particle regenerated aggregate and machine-made sand into a stirrer, stirring for 2min to obtain fine aggregate, adding rubber particles, VAE emulsion, polyurethane prepolymer and dimethylolpropionic acid, and stirring at the rotating speed of 60rpm for 2min to obtain a fine material mixture; adding the fine material mixture and the water reducing agent into the premix prepared in the step 2), and stirring at the rotating speed of 30rpm for 5min to obtain the premix.
Example 4
The fair-faced concrete of the embodiment is prepared from the following raw materials in parts by weight: 155.0kg of cement, 435.0kg of fine aggregate, 270.0kg of coarse aggregate, 75.0kg of zeolite powder, 30.0kg of mullite powder, 5.0kg of rubber particles, 15.0kg of hollow glass beads, 18.0kg of polyurethane prepolymer, 5.0kg of dimethylolpropionic acid, 15.0kg of VAE emulsion, 3.0kg of water reducing agent and 70.0kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The fine aggregate consists of natural sand, fine regenerated aggregate and machine-made sand in a weight ratio of 7:10:16, wherein the particle sizes of the natural sand and the fine regenerated aggregate are 0.6-1.18mm, and the particle size of the machine-made sand is 0.075-0.3 mm. The fine particle regenerated aggregate is obtained by crushing concrete waste and clay brick waste respectively, mixing and screening through a cylindrical screen. The coarse aggregate is flux limestone broken stone with the grain diameter of 2.36-4.75 mm. The zeolite powder has a particle size of 15 μm and a specific surface area of 370m2In terms of/kg. The grain diameter of the mullite powder is 150 mu m. The rubber particle was 0.5 mm. The hollow glass microspheres have an average particle size of 65 μm and a density of 0.2g/cm3. The polyurethane prepolymer is prepared by the polymerization reaction of toluene-2, 4-diisocyanate and polypropylene glycol, and the molar ratio of isocyanic acid group in the toluene-2, 4-diisocyanate to hydroxyl group in the polypropylene glycol is 2:1 during the reaction. The VAE emulsion had a solids content of 54.7% and a viscosity of 3700 mPas. The water reducing agent is a polycarboxylic acid water reducing agent.
The production process of the fair-faced concrete comprises the following steps:
1) respectively crushing the concrete waste and the clay brick waste by using a crusher, then mixing and adding the crushed materials into a cylindrical sieve with the aperture of 1.18mm according to the mass ratio of 2:1, operating the cylindrical sieve at the rotating speed of 1000rpm for 15min, discharging undersize materials, sieving by using a 0.6mm sieve, and taking oversize materials to obtain fine regenerated aggregates;
2) adding cement, zeolite powder and mullite powder into a stirrer, stirring for 3min, adding water, stirring at the rotating speed of 150rpm for 1min to prepare cement paste, adding coarse aggregate and rubber particles, and stirring at the rotating speed of 100rpm for 1min to obtain a premix;
3) adding natural sand, fine particle regenerated aggregate and machine-made sand into a stirrer, stirring for 2min to obtain fine aggregate, adding rubber particles, hollow glass beads, VAE emulsion, polyurethane prepolymer and dimethylolpropionic acid, and stirring at the rotating speed of 60rpm for 2min to obtain a fine material mixture;
adding the fine material mixture and the water reducing agent into the premix prepared in the step 2), and stirring at the rotating speed of 30rpm for 5min to obtain the premix.
Example 5
The fair-faced concrete of the embodiment is prepared from the following raw materials in parts by weight: 155.0kg of cement, 435.0kg of fine aggregate, 270.0kg of coarse aggregate, 75.0kg of zeolite powder, 30.0kg of mullite powder, 5.0kg of rubber particles, 15.0kg of hollow glass microspheres, 18.0kg of polyurethane prepolymer, 5.0kg of dimethylolpropionic acid, 22.0kg of reinforcing fibers, 15.0kg of basic aluminum acetate, 15.0kg of VAE emulsion, 3.0kg of water reducing agent and 70.0kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The fine aggregate consists of natural sand, fine regenerated aggregate and machine-made sand in a weight ratio of 7:10:16, wherein the particle sizes of the natural sand and the fine regenerated aggregate are 0.6-1.18mm, and the particle size of the machine-made sand is 0.075-0.3 mm. Respectively crushing the concrete waste and the clay brick waste, mixing and screening by a cylindrical screen to obtain the fine particle regenerated aggregate and the coarse particle regenerated aggregate. The coarse aggregate is formed by mixing flux limestone broken stones and coarse-grained regeneration aggregate according to the weight ratio of 1:1, and the grain size is 2.36-4.75 mm. The zeolite powder has a particle size of 10 μm and a specific surface area of 540m2/kg。
The grain diameter of the mullite powder is 150 mu m. The rubber particle was 0.5 mm. The hollow glass microspheres have an average particle size of 65 μm and a density of 0.2g/cm3. The polyurethane prepolymer is prepared by the polymerization reaction of toluene-2, 4-diisocyanate and polypropylene glycol, and the molar ratio of isocyanic acid group in the toluene-2, 4-diisocyanate to hydroxyl group in the polypropylene glycol is 2:1 during the reaction. The VAE emulsion had a solids content of 54.7% and a viscosity of 3700 mPas. The reinforcing fiber is bamboo fiber, and the length of the bamboo fiber is 5 mm. The water reducing agent is a polycarboxylic acid water reducing agent.
The production process of the fair-faced concrete comprises the following steps:
1) respectively crushing the concrete waste and the clay brick waste by using a crusher, then mixing and adding the crushed materials into a cylindrical sieve with the aperture of 1.18mm according to the mass ratio of 2:1, and operating the cylindrical sieve at the rotating speed of 1000rpm for 15min to obtain a regenerated undersize product and a regenerated oversize product. Discharging the regenerated undersize, sieving by a 0.6mm sieve, and taking oversize products to obtain fine regenerated aggregates; sieving the regenerated oversize material with a sieve with the aperture of 4.75mm, taking the undersize material and sieving with a sieve with the aperture of 2.36mm, and taking the oversize material as the coarse grain regenerated aggregate;
2) adding cement, zeolite powder and mullite powder into a stirrer, stirring for 3min, adding water, stirring at the rotating speed of 150rpm for 1min to prepare cement paste, adding flux limestone broken stones and coarse grain regenerated aggregates, and stirring at the rotating speed of 100rpm for 1min to obtain a premix;
3) adding natural sand, fine particle regenerated aggregate and machine-made sand into a stirrer, stirring for 2min to obtain fine aggregate, adding reinforcing fibers, rubber particles, hollow glass beads, VAE emulsion, polyurethane prepolymer and dimethylolpropionic acid, and stirring at the rotating speed of 60rpm for 2min to obtain a fine material mixture;
adding the fine material mixture, the water reducing agent and the basic aluminum acetate into the premix prepared in the step 2), and stirring at the rotating speed of 30rpm for 5min to obtain the premix.
Example 6
The fair-faced concrete of the embodiment is prepared from the following raw materials in parts by weight: 160.0kg of cement, 440.0kg of fine aggregate, 280.0kg of coarse aggregate, 77.0kg of zeolite powder, 32.0kg of mullite powder, 4.0kg of rubber particles, 12.0kg of hollow glass beads, 18.0kg of polyurethane prepolymer, 8.0kg of dimethylolpropionic acid, 25.0kg of reinforcing fiber, 18.0kg of basic aluminum acetate, 18.0kg of VAE emulsion, 1kg of polyacrylamide, 3.5kg of water reducing agent and 75.0kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The fine aggregate consists of natural sand, fine regenerated aggregate and machine-made sand in a weight ratio of 7:10:16, wherein the particle sizes of the natural sand and the fine regenerated aggregate are 0.6-1.18mm, and the particle size of the machine-made sand is 0.075-0.3 mm. Respectively crushing the concrete waste and the clay brick waste, mixing and screening by a cylindrical screen to obtain the fine particle regenerated aggregate and the coarse particle regenerated aggregate. The coarse aggregate is formed by mixing flux limestone broken stones and coarse-grained regeneration aggregate according to the weight ratio of 1:2, and the grain size is 2.36-4.75 mm. The zeolite powder has a particle size of 10 μm and a specific surface area of 540m2In terms of/kg. The grain diameter of the mullite powder is 150 mu m. The rubber particle was 0.5 mm. Hollow glass microspheresHas an average particle diameter of 65 μm and a density of 0.2g/cm3. The polyurethane prepolymer is prepared by the polymerization reaction of toluene-2, 4-diisocyanate and polypropylene glycol, and the molar ratio of isocyanic acid group in the toluene-2, 4-diisocyanate to hydroxyl group in the polypropylene glycol is 2:1 during the reaction. The VAE emulsion had a solids content of 54.7% and a viscosity of 3700 mPas. The reinforcing fiber is bamboo fiber, and the length of the bamboo fiber is 5 mm. The particle size of the polyacrylamide was 150. mu.m. The water reducing agent is a polycarboxylic acid water reducing agent.
The production process of the fair-faced concrete comprises the following steps:
1) respectively crushing the concrete waste and the clay brick waste by using a crusher, then mixing and adding the crushed materials into a cylindrical sieve with the aperture of 1.18mm according to the mass ratio of 2:1, and operating the cylindrical sieve at the rotating speed of 1000rpm for 15min to obtain a regenerated undersize product and a regenerated oversize product. Discharging the regenerated undersize, sieving by a 0.6mm sieve, and taking oversize products to obtain fine regenerated aggregates; sieving the regenerated oversize material with a sieve with the aperture of 4.75mm, taking the undersize material and sieving with a sieve with the aperture of 2.36mm, and taking the oversize material as the coarse grain regenerated aggregate;
2) adding cement, zeolite powder and mullite powder into a stirrer, stirring for 3min, adding water, stirring at the rotating speed of 150rpm for 1min to prepare cement paste, adding flux limestone broken stones and coarse grain regenerated aggregates, and stirring at the rotating speed of 100rpm for 1min to obtain a premix;
3) adding natural sand, fine particle regenerated aggregate and machine-made sand into a stirrer, stirring for 2min to obtain fine aggregate, adding reinforcing fibers, rubber particles, hollow glass beads, VAE emulsion, polyurethane prepolymer and dimethylolpropionic acid, and stirring at the rotating speed of 60rpm for 2min to obtain a fine material mixture;
adding the fine material mixture, the water reducing agent, the basic aluminum acetate and the polyacrylamide into the premix prepared in the step 2), and stirring at the rotating speed of 30rpm for 5min to obtain the premix.
Example 7
The fair-faced concrete of the embodiment is prepared from the following raw materials in parts by weight: 165.0kg of cement, 450.0kg of fine aggregate, 275.0kg of coarse aggregate, 76.0kg of zeolite powder, 33.0kg of mullite powder, 3.5kg of rubber particles, 12.0kg of hollow glass beads, 20.0kg of polyurethane prepolymer, 6.0kg of dimethylolpropionic acid, 28.0kg of reinforcing fiber, 17.5kg of basic aluminum acetate, 20.0kg of VAE emulsion, 1kg of polyacrylamide, 5.0kg of water reducing agent and 78.0kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The fine aggregate consists of natural sand, fine regenerated aggregate and machine-made sand in a weight ratio of 7:10:16, wherein the particle sizes of the natural sand and the fine regenerated aggregate are 0.6-1.18mm, and the particle size of the machine-made sand is 0.075-0.3 mm. The fine particle regenerated aggregate is obtained by crushing concrete waste and clay brick waste respectively, mixing and screening through a cylindrical screen. The coarse aggregate is formed by mixing flux limestone broken stones and coarse-grained regeneration aggregate according to the weight ratio of 1:2, and the grain size is 2.36-4.75 mm. The zeolite powder has a particle size of 10 μm and a specific surface area of 540m2In terms of/kg. The grain diameter of the mullite powder is 150 mu m. The rubber particle was 0.5 mm. The hollow glass microspheres have an average particle size of 65 μm and a density of 0.2g/cm3. The polyurethane prepolymer is prepared by the polymerization reaction of toluene-2, 4-diisocyanate and polypropylene glycol, and the molar ratio of isocyanic acid group in the toluene-2, 4-diisocyanate to hydroxyl group in the polypropylene glycol is 2:1 during the reaction. The VAE emulsion had a solids content of 54.7% and a viscosity of 3700 mPas. The reinforcing fiber is bamboo fiber, and the length of the bamboo fiber is 5 mm. The particle size of the polyacrylamide was 150. mu.m. The water reducing agent is a polycarboxylic acid water reducing agent.
The production process of the fair-faced concrete of this embodiment is the same as that of the fair-faced concrete of the above embodiment 6.
Example 8
The fair-faced concrete of the embodiment is prepared from the following raw materials in parts by weight: 162.0kg of cement, 445.0kg of fine aggregate, 272.0kg of coarse aggregate, 76.0kg of zeolite powder, 35.0kg of mullite powder, 4.0kg of rubber particles, 15.0kg of hollow glass beads, 20.0kg of polyurethane prepolymer, 5.0kg of dimethylolpropionic acid, 30.0kg of reinforcing fiber, 17.5kg of basic aluminum acetate, 18.0kg of VAE emulsion, 1kg of polyacrylamide, 4.5kg of water reducing agent and 75.0kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The fine aggregate consists of natural sand, fine regenerated aggregate and machine-made sand in a weight ratio of 7:10:16, wherein the particle sizes of the natural sand and the fine regenerated aggregate are 0.6-1.18mm, and the particle size of the machine-made sand is 0.075-0.3 mm. Fines regenerationThe aggregate is obtained by crushing the concrete waste and the clay brick waste respectively, mixing and screening by a cylindrical screen. The coarse aggregate is formed by mixing flux limestone broken stones and coarse-grained regeneration aggregate according to the weight ratio of 1:2, and the grain size is 2.36-4.75 mm. The zeolite powder has a particle size of 10 μm and a specific surface area of 540m2In terms of/kg. The grain diameter of the mullite powder is 150 mu m. The rubber particle was 0.5 mm. The hollow glass microspheres have an average particle size of 65 μm and a density of 0.2g/cm3. The polyurethane prepolymer is prepared by the polymerization reaction of toluene-2, 4-diisocyanate and polypropylene glycol, and the molar ratio of isocyanic acid group in the toluene-2, 4-diisocyanate to hydroxyl group in the polypropylene glycol is 2:1 during the reaction. The VAE emulsion had a solids content of 54.7% and a viscosity of 3700 mPas. The reinforcing fiber is bamboo fiber, and the length of the bamboo fiber is 5 mm. The particle size of the polyacrylamide was 150. mu.m. The water reducing agent is a polycarboxylic acid water reducing agent.
The production process of the fair-faced concrete of this embodiment is the same as that of the fair-faced concrete of the above embodiment 6.
Example 9
The fair-faced concrete of the embodiment is prepared from the following raw materials in parts by weight: 158.0kg of cement, 445.0kg of fine aggregate, 275.0kg of coarse aggregate, 78.0kg of zeolite powder, 30.0kg of mullite powder, 4.5kg of rubber particles, 15.0kg of hollow glass beads, 22.0kg of polyurethane prepolymer, 7.0kg of dimethylolpropionic acid, 28.0kg of reinforcing fiber, 18.0kg of basic aluminum acetate, 18.0kg of VAE emulsion, 1kg of polyacrylamide, 4.5kg of water reducing agent and 73.0kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The fine aggregate consists of natural sand, fine regenerated aggregate and machine-made sand in a weight ratio of 7:10:16, wherein the particle sizes of the natural sand and the fine regenerated aggregate are 0.6-1.18mm, and the particle size of the machine-made sand is 0.075-0.3 mm. The fine particle regenerated aggregate is obtained by crushing concrete waste and clay brick waste respectively, mixing and screening through a cylindrical screen. The coarse aggregate is formed by mixing flux limestone broken stones and coarse-grained regeneration aggregate according to the weight ratio of 1:2, and the grain size is 2.36-4.75 mm. The zeolite powder has a particle size of 10 μm and a specific surface area of 540m2In terms of/kg. The grain diameter of the mullite powder is 150 mu m. The rubber particle was 0.5 mm. The hollow glass microspheres have an average particle size of 65 μm and a density of 0.2g/cm3. Polyurethane pre-coatThe polymer is prepared by the polymerization reaction of toluene-2, 4-diisocyanate and polypropylene glycol, and the molar ratio of isocyanic acid group in the toluene-2, 4-diisocyanate to hydroxyl group in the polypropylene glycol is 2: 1. The VAE emulsion had a solids content of 54.7% and a viscosity of 3700 mPas. The reinforcing fiber is bamboo fiber, and the length of the bamboo fiber is 5 mm. The particle size of the polyacrylamide was 150. mu.m. The water reducing agent is a polycarboxylic acid water reducing agent.
The production process of the fair-faced concrete of this embodiment is the same as that of the fair-faced concrete of the above embodiment 6.
Comparative example
Comparative example 1
The fair-faced concrete of the comparative example is prepared from the following raw materials in parts by weight: 150.0kg of cement, 430.0kg of fine aggregate, 260.0kg of coarse aggregate, 80.0kg of zeolite powder, 2.0kg of water reducing agent and 65kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The fine aggregate is natural sand, and the particle size of the natural sand is 0.6-1.18 mm. The coarse aggregate is flux limestone broken stone with the grain diameter of 2.36-4.75 mm. The zeolite powder has a particle size of 15 μm and a specific surface area of 370m2In terms of/kg. The water reducing agent is a polycarboxylic acid water reducing agent.
The production process of the fair-faced concrete of the comparative example comprises the following steps:
1) adding cement and zeolite powder into a stirrer, stirring for 5min, adding water, stirring at a rotating speed of 120rpm for 1min to prepare cement paste, adding coarse aggregate, and stirring at a rotating speed of 80rpm for 2min to obtain a premix;
2) adding fine aggregate and a water reducing agent into the premix prepared in the step 1), and stirring at the rotating speed of 30rpm for 5min to obtain the premix.
Comparative example 2
The fair-faced concrete of the comparative example is prepared from the following raw materials in parts by weight: 150.0kg of cement, 430.0kg of fine aggregate, 260.0kg of coarse aggregate, 80.0kg of fly ash, 2.0kg of water reducing agent and 65kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The fine aggregate consists of natural sand, fine regenerated aggregate and machine-made sand in a weight ratio of 6:8:15, the particle sizes of the natural sand and the fine regenerated aggregate are both 0.6-1.18mm, and the particle size of the machine-made sand is 0.075-0.3mm. The fine particle regenerated aggregate is obtained by crushing and screening concrete waste. The coarse aggregate is flux limestone broken stone with the grain diameter of 2.36-4.75 mm. Specific surface area of fly ash 370m2In terms of/kg. The water reducing agent is a polycarboxylic acid water reducing agent.
The production process of the fair-faced concrete of the comparative example comprises the following steps:
1) crushing the concrete waste by using a crusher, then adding the crushed concrete waste into a cylindrical sieve with the aperture of 1.18mm, operating the cylindrical sieve at the rotating speed of 800rpm for 25min, discharging undersize, sieving by using a 0.6mm sieve, and taking oversize to obtain fine regenerated aggregate;
2) adding cement and fly ash into a stirrer, stirring for 5min, adding water, stirring for 1min at the rotating speed of 120rpm to prepare cement paste, adding coarse aggregate, and stirring for 2min at the rotating speed of 80rpm to obtain premix;
3) adding natural sand, fine particle regenerated aggregate and machine-made sand into a stirrer, stirring for 3min to obtain fine aggregate, adding the fine aggregate and a water reducing agent into the premix prepared in the step 2), and stirring for 5min at the rotating speed of 30rpm to obtain the material.
Comparative example 3
The fair-faced concrete of the comparative example is prepared from the following raw materials in parts by weight: 150.0kg of cement, 430.0kg of fine aggregate, 260.0kg of coarse aggregate, 2.0kg of water reducing agent and 65kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The fine aggregate consists of natural sand, fine regenerated aggregate and machine-made sand in a weight ratio of 6:8:15, wherein the particle sizes of the natural sand and the fine regenerated aggregate are 0.6-1.18mm, and the particle size of the machine-made sand is 0.075-0.3 mm. The fine particle regenerated aggregate is obtained by crushing and screening concrete waste. The coarse aggregate is limestone with particle size of 2.36-4.75 mm. The zeolite powder has a particle size of 15 μm and a specific surface area of 370m2In terms of/kg. The water reducing agent is a polycarboxylic acid water reducing agent.
The production process of the fair-faced concrete of the comparative example comprises the following steps:
1) crushing the concrete waste by using a crusher, then adding the crushed concrete waste into a cylindrical sieve with the aperture of 1.18mm, operating the cylindrical sieve at the rotating speed of 800rpm for 25min, discharging undersize, sieving by using a 0.6mm sieve, and taking oversize to obtain fine regenerated aggregate;
2) adding cement and zeolite powder into a stirrer, stirring for 5min, adding water, stirring at a rotating speed of 120rpm for 1min to prepare cement paste, adding coarse aggregate, and stirring at a rotating speed of 80rpm for 2min to obtain a premix;
3) adding natural sand, fine particle regenerated aggregate and machine-made sand into a stirrer, stirring for 3min to obtain fine aggregate, adding the fine aggregate and a water reducing agent into the premix prepared in the step 2), and stirring for 5min at the rotating speed of 30rpm to obtain the material.
Performance test
The bare concrete in the examples 1 to 9 and the comparative examples 1 to 3 is taken, the color, the crack and the smoothness of the concrete are observed and measured, the compression strength of the bare concrete is detected according to GB/T50081-2002 Standard test method for mechanical properties of ordinary concrete, and the test results are shown in Table 1.
TABLE 1 Performance test results of bare concrete in examples 1 to 9 and comparative examples 1 to 3
It can be seen from the combination of example 1, comparative example 1 and table 1 that the color of the concrete mixed with natural sand, machine-made sand and recycled aggregate to obtain fine aggregate is slightly inferior to that of the concrete using natural sand as fine aggregate, but the appearance difference is not large, and the strength of the concrete of example 1 is slightly higher than that of the concrete of example 1, so that the concrete of comparative example 1 is generally lower in cost and better in overall performance.
It can be seen from the combination of example 1, comparative example 2 and table 1 that the appearance of the concrete using zeolite does not change much, but the strength is improved to a large extent.
It can be seen from the combination of example 1, comparative example 3 and table 1 that the strength of the concrete can be improved to some extent by using flux limestone broken stones instead of limestone broken stones.
To sum up, the fair-faced concrete of this application appearance quality is better, and intensity is higher, has reduced the crack quantity on concrete surface moreover by a wide margin, and cost greatly reduced also has good comprehensive properties.
Claims (10)
1. The fair-faced concrete is characterized by being mainly prepared from the following raw materials in parts by weight: 150-165 parts of cement, 430-450 parts of fine aggregate, 260-280 parts of coarse aggregate, 75-80 parts of zeolite powder, 2-5 parts of water reducing agent and 65-78 parts of water; the fine aggregate consists of natural sand, fine particle regenerated aggregate and machine-made sand in a weight ratio of 6-8:8-12:15-18, and the fine particle regenerated aggregate is made of construction waste.
2. The fair-faced concrete of claim 1, which is mainly prepared from the following raw materials in parts by weight: 155 portions of cement, 435 portions of fine aggregate, 450 portions of coarse aggregate, 270 portions of coarse aggregate, 75-78 portions of zeolite powder, 3-5 portions of water reducing agent and 70-78 portions of water; the fine aggregate consists of natural sand, fine particle regenerated aggregate and machine-made sand in a weight ratio of 6-8:8-12:15-18, and the fine particle regenerated aggregate is made of construction waste.
3. The fair-faced concrete as claimed in claim 1 or 2, wherein the zeolite powder has a specific surface area of 300-550m2/kg。
4. The fair-faced concrete according to claim 1 or 2, wherein the raw materials further comprise 28-35 parts by weight of mullite powder.
5. Bare concrete according to claim 1 or 2, characterised in that the raw material also comprises 3-5 parts by weight of rubber particles.
6. The fair-faced concrete of claim 1 or 2, wherein the raw materials further comprise 12-15 parts by weight of hollow glass microspheres.
7. Bare concrete according to claim 1 or 2, characterised in that the construction waste consists of concrete waste, clay brick waste in a weight ratio of 4-5: 1.
8. A process for the production of bare concrete according to claim 1, comprising the steps of:
1) mixing cement, zeolite powder and water uniformly to prepare cement paste;
uniformly mixing the coarse aggregate and cement paste to prepare premix;
2) and (3) uniformly mixing the premix, the fine aggregate and the water reducing agent to obtain the water reducing agent.
9. The process for producing as-cast finish concrete as claimed in claim 8, wherein the step 1) of mixing cement, zeolite powder and water uniformly comprises the steps of mixing cement and zeolite powder uniformly in a dry manner, and then mixing the mixture uniformly with water to obtain the cement paste.
10. The process for producing as-cast finish concrete as claimed in claim 8, wherein in step 1), the coarse aggregate is mixed with the cement slurry uniformly, and the mixture is stirred at a rotation speed of 80-100rpm for 1-2 min.
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