CN112573878A - Colored water-permeable concrete and preparation method thereof - Google Patents
Colored water-permeable concrete and preparation method thereof Download PDFInfo
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/48—Metal
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/18—Waste materials; Refuse organic
- C04B18/24—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/80—Optical properties, e.g. transparency or reflexibility
- C04B2111/82—Coloured materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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 application relates to a colored water permeable concrete and a preparation method thereof, belonging to the technical field of concrete production and comprising the following components in parts by weight: 350 parts of cement 260-90 parts, 1300 parts of water 80-90 parts, 1200-1300 parts of coarse aggregate, 5-7 parts of hybrid fiber, 3-6 parts of whisker filler, 2-4 parts of silicone-acrylic emulsion, 25-35 parts of pigment and 3-5 parts of water reducer; wherein the hybrid fiber comprises steel fiber and plant fiber modified by nano calcium carbonate; the preparation method comprises S1, mixing the mixed fiber with water, and stirring; and S2, sequentially adding the residual materials into the mixture obtained in the step S1, and uniformly stirring to obtain the colored water-permeable concrete. This application has the effect that improves the compressive strength of colored concrete that permeates water.
Description
Technical Field
The application relates to the field of concrete production, in particular to colored water-permeable concrete and a preparation method thereof.
Background
The colorful pervious concrete is also called porous concrete or drainage concrete, and is formed by mutually bonding a layer of thin slurry coated on the surface of coarse aggregate, so that rainwater can flow into the underground, effectively supplement underground water, keep soil humidity and maintain ecological balance of the underground water and the soil; and can effectively eliminate the harm of oil compounds on the ground and the like to the environmental pollution; in addition, the colored pervious concrete is colorful and has landscape fusion, so that the construction of urban environment is more harmonious, the material is a good pervious terrace material which can protect the nature, maintain the ecological balance and relieve the urban 'heat island effect', and the material has extremely profound significance in the works of urban rainwater management, water pollution prevention and control, sponge city establishment and the like, and is beneficial to the benign development of human living environment.
The existing pervious concrete is generally prepared by stirring a cementing material, fine aggregate, coarse aggregate, an additive, water and a pigment according to a certain proportion. Conventionally, in order to increase the water permeability, the amount of fine aggregate added is often reduced or the fine aggregate is not added as it is. Because the content of the fine aggregate is reduced, the particle size of the coarse aggregate is larger, the specific surface area is small, so that the contact points among the aggregate particles are fewer, the bonding strength is lower, and the compressive strength of the concrete is lower.
Disclosure of Invention
In order to increase the bonding strength between the raw materials of the colored pervious concrete and further improve the compressive strength of the concrete, the application provides the colored pervious concrete and the preparation method thereof.
In a first aspect, the application provides a colored water permeable concrete, which adopts the following technical scheme:
the colored water permeable concrete comprises the following components in parts by weight: 350 parts of cement 260-90 parts, 1300 parts of water 80-90 parts, 1200-1300 parts of coarse aggregate, 5-7 parts of hybrid fiber, 3-6 parts of whisker filler, 2-4 parts of silicone-acrylic emulsion, 25-35 parts of pigment and 3-5 parts of water reducer; wherein the hybrid fiber comprises steel fiber and plant fiber modified by nano calcium carbonate.
Through adopting above-mentioned technical scheme, mutually support between each raw materials in this application, the synergism has improved the compressive strength and the anti cracking property of the concrete that permeates water of colour when guaranteeing the rate of permeating water of the concrete preferred that permeates water of colour, has increased the durability of the concrete that permeates water of colour.
The steel fibers can not be nodulated in the colored pervious concrete, are uniformly distributed and are distributed in a three-dimensional disorderly manner, and when cracks appear in the colored pervious concrete, the load can be transmitted through the steel fibers, so that the stress concentration is reduced, and the expansion of the cracks is reduced. The nano calcium carbonate modified plant fibers are matched with the steel fibers, and the rigid steel fibers and the flexible plant fibers act together to realize the effect of rigidity and flexibility, so that the compressive strength and the flexural strength of the colored pervious concrete can be greatly enhanced. In addition, the plant fiber is modified by the nano calcium carbonate, so that on one hand, the nano calcium carbonate can promote the cement hydration reaction and generate new hydration products, thereby improving the pore structure of the colored pervious concrete and improving the compressive strength and the flexural strength; on the other hand, the nano calcium carbonate loaded with the plant fibers can enable pore channels of the pore structure of the plant fibers to be more stable, meanwhile, the nano calcium carbonate has poor dispersibility and is easy to agglomerate in the colored pervious concrete, and the nano calcium carbonate can be loaded on the plant fibers to increase the dispersibility of the nano calcium carbonate, so that the effect of the nano calcium carbonate is fully exerted.
The whisker filler has higher strength, is added into the colored pervious concrete, is favorable for increasing the strength of the colored pervious concrete, can disperse most stress when the colored pervious concrete is stressed, avoids stress concentration, and is simultaneously cooperated with the hybrid fiber, so that the expansion of cracks is effectively slowed down, and the compressive strength and the flexural strength of the colored pervious concrete are improved.
In addition, the whisker filler can enhance the pore walls among the frameworks in the hydration process of the color pervious concrete, so that a firm and stable framework gap structure is formed by hydration products and aggregates, the stability of the color pervious concrete framework is enhanced, and the color pervious concrete has better compressive strength while keeping better water permeability.
The joining of silicone-acrylic emulsion can improve the adhesion between the modified plant fiber of nano calcium carbonate and the steel fiber for the cooperation that nano calcium carbonate modified plant fiber and steel fiber can be better, when the colored concrete that permeates water destroys, make the modified plant fiber of nano calcium carbonate to produce the effect of dragging to the steel fiber, increase the inside bulk strength of colored concrete that permeates water, make each composition in the colored concrete that permeates water connect inseparabler, simultaneously, can reduce the condition that the steel fiber pulled out from the colored concrete that permeates water.
Preferably, the method for modifying plant fiber comprises: mixing plant fiber and nano calcium carbonate at a weight ratio of (8-12) to 1, and stirring for 20-30 min.
By adopting the technical scheme, after mechanical mixing, the nano calcium carbonate can be adsorbed into the pore canal of the plant fiber, so that the porous structure of the plant fiber is more stable on the one hand, and the dispersibility of the nano calcium carbonate in the color pervious concrete is improved on the other hand, thereby better playing the role and improving the strength of the color pervious concrete.
Preferably, the plant fiber is porous plant fiber, and the preparation method comprises the following steps:
(1) mixing acetic anhydride and xylene in a volume ratio of 1: (4-4.5) to obtain a modified solution;
(2) stirring 5-10 parts of plant fiber at 190 ℃ for 10-15min at 180 ℃ to obtain expanded plant fiber;
(3) calcining the expanded plant fiber in the step (2) at the temperature of 900-1000 ℃, then soaking the calcined expanded plant fiber in 30-40mL of the modification solution obtained in the step (1) at the temperature of 110-120 ℃ for 0.5-1.5h, filtering and drying to obtain the porous plant fiber.
Through adopting above-mentioned technical scheme, at first make the plant fiber high temperature calcination after fully expanding through high temperature to firm plant fiber's macroporous pore structure, then utilize acetic anhydride and xylol to modify plant fiber, form abundant micropore pore in the macroporous pore, form network pore structure with the macroporous pore, can stabilize pore structure and promote plant fiber's porosity, thereby make porous plant fiber when increasing the concrete resistance to compression and the breaking strength of permeating water of colour, can also increase the rate of permeating water of the concrete of permeating water.
Preferably, the stirring speed is 1100-1200 r/min.
By adopting the technical scheme, the agglomeration phenomenon of the nano calcium carbonate can be reduced by high-speed stirring at the speed of 1100-1200r/min, so that the nano calcium carbonate can be fully adsorbed in the pore channels of the plant fibers.
Preferably, the steel fiber is modified steel fiber, and the modification method comprises the following steps:
1) mixing 5-8 parts of silane coupling agent, 8-12 parts of ethanol and 80-90 parts of water, and adjusting the pH to 4.3-4.7 to obtain a treatment solution;
2) adding 3-4 parts of steel fiber into the treatment liquid obtained in the step 1), soaking for 8-10h, filtering and drying to obtain the modified steel fiber.
By adopting the technical scheme, the silane coupling agent is coated on the surface of the steel fiber, so that the connection strength of the steel fiber and the aggregate is increased, meanwhile, the silane coupling agent on the surface of the modified steel fiber can react with the nano calcium carbonate modified plant fiber, so that the nano calcium carbonate modified plant fiber is combined with the modified steel fiber through chemical bonds, the connection strength between the modified steel fiber and the nano calcium carbonate modified plant fiber is increased, a rigid and flexible complementary net structure is formed more stably, and the synergistic effect of the modified steel fiber and the nano calcium carbonate modified plant fiber is better played, so that the compressive strength and the flexural strength of the color pervious concrete are enhanced.
Preferably, the weight ratio of the steel fiber to the nano calcium carbonate modified plant fiber is 0.5-0.7.
By adopting the technical scheme, the plant fibers have good flexibility, the plant fibers are easy to agglomerate when the adding amount is large, the dispersibility of the plant fibers is influenced, the plant fibers are easy to break, the compressive strength and the flexural strength of the color pervious concrete are influenced on the contrary when the adding amount is too large, and tests show that the compressive strength and the flexural strength of the prepared color pervious concrete are good when the weight ratio of the steel fibers to the plant fibers modified by the nano calcium carbonate is 0.5-0.7.
Preferably, the raw material also comprises 3-6 parts of diatomite.
By adopting the technical scheme, the diatomite is of a porous structure and is matched with the plant fiber modified by the nano calcium carbonate, so that the water permeability of the colored pervious concrete is further improved; in addition, the diatomite can improve the dispersibility of the raw materials, so that the raw materials can be fully dispersed, and the strength of the colored pervious concrete is improved. In addition, the silicon hydroxyl on the surface of the diatomite can generate hydration reaction with cement, so that the early strength of the colored pervious concrete is improved.
Preferably, the whisker filler comprises one or more of calcium sulfate whisker, calcium silicate whisker and alumina whisker.
Preferably, the silane coupling agent comprises one or two of gamma-methacryloxypropyltrimethoxysilane and gamma-methacryloxypropyltrichlorosilane.
By adopting the technical scheme, the gamma-methacryloxypropyl trimethoxysilane and the gamma-methacryloxypropyl trichlorosilane both contain ester bonds, carboxyl is generated after hydrolysis, and can be combined with calcium ions in the nano calcium carbonate and calcium ions in the colored pervious concrete through chemical bonds, so that the connection strength of the steel fibers and the nano calcium carbonate modified plant fibers and the bonding strength between the steel fibers and the colored pervious concrete are further improved, the condition that the modified steel fibers are drawn out of the colored pervious concrete is reduced, and the folding resistance and the compression resistance of the colored pervious concrete are improved.
In a second aspect, the present application provides a method for preparing a colored water-permeable concrete, which adopts the following technical scheme:
a preparation method of colored water permeable concrete comprises the following steps:
s1, mixing and stirring the mixed fiber and water evenly;
and S2, sequentially adding the residual materials into the mixture obtained in the step S1, and uniformly stirring to obtain the colored water-permeable concrete.
By adopting the technical scheme, firstly, the hybrid fibers are mixed with water, so that the plant fibers modified by the nano calcium carbonate can be better dispersed, the agglomeration phenomenon is reduced, and on the other hand, the plant fibers modified by the nano calcium carbonate and the steel fibers can be combined to form a rigid-flexible three-dimensional network structure, so that other raw materials can be connected into a whole, and the compressive strength and the flexural strength of the colored pervious concrete can be improved.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the formula and the mixture ratio of the raw materials are scientific and reasonable, and the synergistic effect is played in the process of preparing the colored pervious concrete, so that the compressive strength and the bending resistance of the colored pervious concrete can be improved, and the colored pervious concrete has better water permeability;
2. the steel fibers and the plant fibers modified by the nano calcium carbonate are matched to form a rigid-flexible three-dimensional network structure, so that the raw material components can be connected into a whole to increase the mechanical property of the colored pervious concrete; meanwhile, the strength of a framework formed by the colored pervious concrete is further increased by adding the whisker filler, so that the compressive strength of the colored pervious concrete is increased;
3. the nano calcium carbonate modifies the plant fiber, and is loaded in the pore channel of the plant fiber, so that the pore channel of the plant fiber is more stable, and meanwhile, the dispersibility of the nano calcium carbonate is increased, the nano calcium carbonate can fully perform hydration reaction with cement, and the compressive strength of the colored pervious concrete is improved;
4. the plant fibers are modified to obtain porous plant fibers, so that the porosity of the plant fibers can be increased, and the water permeability of the colored pervious concrete is improved;
5. through adopting silane coupling agent to modify steel fiber for through chemical bond connection between steel fiber and the modified plant fiber of nano calcium carbonate, increase steel fiber and the modified plant fiber's of nano calcium carbonate joint strength, make the network structure who forms more stable.
Detailed Description
The present application will be described in further detail with reference to examples and comparative examples.
Preparation example
Preparation example 1
Preparing porous plant fibers: adding the plant fiber and the nano calcium carbonate into a stirrer according to the weight ratio of 8:1, and stirring at the rotating speed of 1100r/min for 20min to obtain porous plant fiber;
wherein, the plant fiber is straw fiber from Hangzhou high-tech composite material company, and the nano calcium carbonate is from Changkai printing equipment company, with 6250 meshes.
Preparation example 2
Preparing porous plant fibers: adding the plant fiber and the nano calcium carbonate into a stirrer according to the weight ratio of 10:1, and stirring at the rotating speed of 1150r/min for 25min to obtain porous plant fiber;
wherein, the plant fiber is ramie fiber purchased from Hangzhou high-tech composite material company, and the nano calcium carbonate is purchased from Changkai printing equipment company, with 6250 meshes.
Preparation example 3
Preparing porous plant fibers: adding the plant fiber and the nano calcium carbonate into a stirrer according to the weight ratio of 12:1, and stirring at the rotating speed of 1200r/min for 30min to obtain porous plant fiber;
wherein the plant fiber is cotton fiber from Hangzhou high-tech composite material Co., Ltd, and the nano calcium carbonate is from Changkai printing equipment Co., Ltd, with 6250 mesh.
Preparation example 4
The preparation method of the plant fiber modified by the nano calcium carbonate comprises the following steps:
(1) mixing acetic anhydride and xylene in a volume ratio of 1: 4 to obtain a modified solution;
(2) stirring 5g of plant fiber at 180 ℃ for 10min to obtain expanded plant fiber;
(3) calcining the expanded plant fiber obtained in the step (2) at 900 ℃, then soaking the calcined expanded plant fiber into 30mL of the modified liquid obtained in the step (1), soaking the calcined expanded plant fiber at 110 ℃ for 0.5h, filtering and drying to obtain porous plant fiber; wherein the plant fiber is straw fiber from Hangzhou high-tech composite material Co.
Preparation example 5
The preparation method of the plant fiber modified by the nano calcium carbonate comprises the following steps:
(1) mixing acetic anhydride and xylene in a volume ratio of 1: 4.2, mixing to obtain a modified solution;
(2) stirring 7.5g of plant fiber at 185 deg.C for 13min to obtain expanded plant fiber;
(3) calcining the expanded plant fiber obtained in the step (2) at 950 ℃, then soaking the calcined expanded plant fiber into 35mL of the modified liquid obtained in the step (1), soaking the calcined expanded plant fiber at 115 ℃ for 1h, filtering and drying the soaked expanded plant fiber to obtain porous plant fiber; wherein the plant fiber is cotton fiber from Hangzhou high-tech composite material Co.
Preparation example 6
The preparation method of the plant fiber modified by the nano calcium carbonate comprises the following steps:
(1) mixing acetic anhydride and xylene in a volume ratio of 1: 4.5 to obtain a modified solution;
(2) stirring 10g of plant fiber at 190 ℃ for 15min to obtain expanded plant fiber;
(3) calcining the expanded plant fiber obtained in the step (2) at 1000 ℃, then soaking the calcined expanded plant fiber into 40mL of the modified liquid obtained in the step (1), soaking the calcined expanded plant fiber at 120 ℃ for 1.5h, filtering and drying to obtain porous plant fiber; wherein the plant fiber is ramie fiber from Hangzhou high-tech composite material Co.
Preparation example 7
The preparation method of the plant fiber modified by the nano calcium carbonate is different from the preparation example 5 in that the plant fiber adopts the porous plant fiber prepared in the preparation example 1.
Preparation example 8
The preparation method of the plant fiber modified by the nano calcium carbonate is different from the preparation example 5 in that the plant fiber adopts the porous plant fiber prepared in the preparation example 2.
Preparation example 9
The preparation method of the plant fiber modified by the nano calcium carbonate is different from the preparation example 5 in that the plant fiber adopts the porous plant fiber prepared in the preparation example 3.
Preparation example 10
The modification method of the steel fiber comprises the following steps:
1) mixing 5g of gamma-methacryloxypropyltrimethoxysilane, 12g of ethanol and 90g of water, and adjusting the pH value to 4.3 by using acetic acid to obtain a treatment solution;
2) adding 3g of steel fiber into the treatment liquid obtained in the step 1), soaking for 8 hours, filtering and drying to obtain the modified steel fiber.
Preparation example 11
The modification method of the steel fiber comprises the following steps:
1) mixing 6.5g of gamma-methacryloxypropyl trichlorosilane, 10g of ethanol and 85g of water, and adjusting the pH value to 4.5 by using acetic acid to obtain a treatment solution;
2) adding 3.5g of steel fiber into the treatment liquid obtained in the step 1), soaking for 9 hours, filtering and drying to obtain the modified steel fiber.
Preparation example 12
The modification method of the steel fiber comprises the following steps:
1) mixing 4g of gamma-methacryloxypropyl trichlorosilane, 4g of gamma-methacryloxypropyl trimethoxysilane, 8g of ethanol and 80g of water, and adjusting the pH value to 4.7 by using acetic acid to obtain a treatment solution;
2) adding 4g of steel fiber into the treatment liquid obtained in the step 1), soaking for 10 hours, filtering and drying to obtain the modified steel fiber.
Example 1
The preparation method of the colored pervious concrete comprises the following steps;
s1, adding 5g of the hybrid fiber and 90g of water into a stirrer, and uniformly mixing and stirring to obtain a mixture;
s2, sequentially adding 260g of cement, 1300g of coarse aggregate, 3g of calcium sulfate whisker, 4g of silicone-acrylic emulsion, 35g of pigment and 3g of water reducing agent into a stirrer, and uniformly stirring to obtain the colored water-permeable concrete;
wherein the hybrid fiber comprises 1.7g of steel fiber and 3.3g of the nano calcium carbonate modified plant fiber prepared in the preparation example 4;
the cement is P.O42.5 ordinary portland cement produced by Yangquan Jidong cement factories;
the coarse aggregate is crushed stone produced by Yongxing stone factory of longevity Yang, and the particle size of the crushed stone is 10-25 mm;
the pigment is an iron oxide pigment;
the water reducing agent is a polycarboxylic acid water reducing agent purchased from Shenyang Xingzheng and chemical engineering limited company;
silicone-acrylate emulsion was purchased from Henan Youguan chemical products, Inc.
Example 2
The preparation method of the colored pervious concrete comprises the following steps;
s1, adding 6g of the hybrid fiber and 85g of water into a stirrer, and uniformly mixing and stirring to obtain a mixture;
s2, sequentially adding 300g of cement, 1250g of coarse aggregate, 4.5g of calcium silicate whiskers, 3g of silicone-acrylic emulsion, 30g of pigment and 4g of water reducing agent into a stirrer, and uniformly stirring to obtain the colored water-permeable concrete;
wherein the hybrid fiber comprises 2.25g of steel fiber and 3.75g of the nano calcium carbonate modified plant fiber prepared in the preparation example 5;
the cement is P.O42.5 ordinary portland cement produced by Yangquan Jidong cement factories;
the coarse aggregate is crushed stone produced by Yongxing stone factory of longevity Yang, and the particle size of the crushed stone is 10-25 mm;
the pigment is an iron oxide pigment;
the water reducing agent is a polycarboxylic acid water reducing agent purchased from Shenyang Xingzheng and chemical engineering limited company;
silicone-acrylate emulsion was purchased from Henan Youguan chemical products, Inc.
Example 3
The preparation method of the colored pervious concrete comprises the following steps;
s1, adding 7g of the hybrid fiber and 80g of water into a stirrer, and uniformly mixing and stirring to obtain a mixture;
s2, sequentially adding 350g of cement, 1200g of coarse aggregate, 6g of alumina whisker, 2g of silicone-acrylic emulsion, 25g of pigment and 5g of water reducing agent into a stirrer, and uniformly stirring to obtain the colored water-permeable concrete;
wherein the hybrid fiber comprises 2.9g of steel fiber and 4.1g of the plant fiber modified by the nano calcium carbonate prepared in the preparation example 6;
the cement is P.O42.5 ordinary portland cement produced by Yangquan Jidong cement factories;
the coarse aggregate is crushed stone produced by Yongxing stone factory of longevity Yang, and the particle size of the crushed stone is 10-25 mm;
the pigment is an iron oxide pigment;
the water reducing agent is a polycarboxylic acid water reducing agent purchased from Shenyang Xingzheng and chemical engineering limited company;
silicone-acrylate emulsion was purchased from Henan Youguan chemical products, Inc.
Example 4
A colored pervious concrete prepared by the following method, which is different from the embodiment 2 in that the plant fiber modified by the nano calcium carbonate is the plant fiber modified by the nano calcium carbonate prepared in the preparation example 7.
Example 5
A colored pervious concrete prepared by the following method, which is different from the embodiment 2 in that the plant fiber modified by the nano calcium carbonate is the plant fiber modified by the nano calcium carbonate prepared in the preparation 8.
Example 6
A colored pervious concrete prepared by the following method, which is different from the embodiment 2 in that the plant fiber modified by the nano calcium carbonate is the plant fiber modified by the nano calcium carbonate prepared in the preparation 9.
Example 7
A colored pervious concrete obtained by the following method, which is different from example 2 in that the steel fiber used was the modified steel fiber of preparation example 10.
Example 8
A colored pervious concrete obtained by the following method, which is different from example 2 in that the steel fiber used was the modified steel fiber of preparation example 11.
Example 9
A colored pervious concrete obtained by the following method, which is different from example 2 in that the steel fiber used was the modified steel fiber of preparation example 12.
Example 10
A colored pervious concrete obtained by the following method, which is different from example 2 in that 3g of diatomaceous earth having a particle size of 200nm was further added in step S2.
Example 11
A colored pervious concrete obtained by the following method, which is different from example 2 in that 4.5g of diatomaceous earth having a particle size of 200nm was further added in step S2.
Example 12
A colored pervious concrete obtained by the following method, which is different from example 2 in that 6g of diatomaceous earth having a particle size of 200nm was further added in step S2.
Comparative example 1
A difference from example 2 was that 240g of cement, 100g of water, 1000g of crushed stone, 9g of hybrid fiber, 2g of calcium silicate whisker, 6g of silicone-acrylic emulsion, 20g of iron oxide pigment, and 7g of polycarboxylic acid water reducing agent.
Comparative example 2
The difference between the colored pervious concrete prepared by the following method and the concrete of example 2 is that 400g of cement, 70g of water, 1400g of gravel, 4g of hybrid fiber, 8g of calcium silicate whisker, 1g of silicone-acrylic emulsion, 40g of iron oxide pigment and 2g of polycarboxylic acid water reducing agent.
Comparative example 3
A color pervious concrete prepared by the following method, which is different from the embodiment 2 in that the same amount of nano calcium carbonate modified plant fiber is used to replace the steel fiber.
Comparative example 4
A colored pervious concrete prepared by the following method is different from the concrete prepared in example 2 in that the same amount of steel fibers is used for replacing the plant fibers modified by the nano calcium carbonate.
Comparative example 5
A colored pervious concrete prepared by the following method differs from example 2 in that no whisker filler is contained.
Comparative example 6
A color pervious concrete prepared by the following method, which is different from the embodiment 2 in that the plant fiber modified by the nano calcium carbonate is unmodified plant fiber.
Performance testing
The colored pervious concrete prepared in examples 1-12 and comparative examples 1-6 was prepared into test pieces with the size of 100 × 100 × 100mm, and cured in a standard curing room, then the compressive strength and the flexural strength of the colored pervious concrete were tested according to GB/T50081-2002 "standard of test methods for mechanical properties of ordinary concrete", and the water permeability performance was tested by cjc/T135-2009 "technical specification for pervious cement concrete pavements", and the results are listed in table 1.
| Compressive strength (MPa) | Flexural strength (MPa) | Coefficient of water permeability (K/mm. S)-1) | |
| Example 1 | 47.2 | 6.6 | 13.4 |
| Example 2 | 47.5 | 6.9 | 14.1 |
| Example 3 | 47.1 | 6.5 | 13.2 |
| Example 4 | 48.6 | 7.2 | 14.7 |
| Example 5 | 48.8 | 7.5 | 15.4 |
| Example 6 | 48.5 | 7.0 | 14.4 |
| Example 7 | 49.3 | 7.7 | 15.8 |
| Example 8 | 49.5 | 8.0 | 16.5 |
| Example 9 | 49.2 | 7.6 | 15.6 |
| Example 10 | 48.8 | 7.4 | 15.2 |
| Example 11 | 48.9 | 7.5 | 15.4 |
| Example 12 | 48.6 | 7.3 | 15.0 |
| Comparative example 1 | 40.2 | 5.6 | 11.2 |
| Comparative example 2 | 39.2 | 5.1 | 10.1 |
| Comparative example 3 | 35.9 | 4.6 | 9.0 |
| Comparative example 4 | 36.0 | 4.7 | 9.2 |
| Comparative example 5 | 34.1 | 4.5 | 8.8 |
| Comparative example 6 | 42.1 | 5.9 | 11.9 |
By combining examples 1-12 and comparative examples 1-6, and by combining table 1, it can be seen that the compressive strength, the flexural strength and the water permeability coefficient of the colored pervious concrete in examples 1-12 are superior to those of comparative examples 1-6, which indicates that the formulation and the proportion of the colored concrete are scientific and reasonable, and the raw materials are synergistic, so that the prepared colored pervious concrete has better compressive strength and flexural strength under the condition of ensuring better water permeability coefficient.
By combining the example 2 and the examples 4 to 6 and combining the table 1, it can be seen that the water permeability coefficients in the examples 4 to 6 are all higher than those in the example 2, which shows that the water permeability of the color pervious concrete can be improved by adopting the porous plant fibers, and meanwhile, the compressive strength and the flexural strength in the examples 4 to 6 are also better than those in the example 2, which shows that the addition of the porous plant fibers not only can increase the water permeability of the color pervious concrete, but also the stability of the porous plant fibers and the pore structure is better, so that the flexural strength and the compressive strength of the color pervious concrete are increased to a certain extent.
By combining the example 2 and the examples 7 to 9 and combining the table 1, it can be seen that the compressive strength, the flexural strength and the water permeability coefficient of the examples 7 to 9 are better than those of the example 2, which shows that the modified steel fibers can be better combined with a concrete structure, the connection strength with the concrete is increased, and meanwhile, the connection strength between the modified steel fibers and the plant fibers modified by the nano calcium carbonate is increased, so that the formed three-dimensional reticular structure is more stable, and the mechanical property of the colored water permeable concrete is improved.
By combining the example 2 and the comparative examples 3 to 4 and combining the table 1, it can be seen that the compressive strength, the flexural strength and the water permeability coefficient of the colored pervious concrete of the example 2 are superior to those of the comparative examples 3 to 4, which shows that the steel fibers and the plant fibers modified by the nano calcium carbonate can cooperate to form a stable three-dimensional network structure, so that the compressive strength and the flexural strength of the colored pervious concrete are increased, and the good water permeability coefficient is maintained.
By combining the example 2 and the comparative example 5 and combining the table 1, it can be seen that the compressive strength and the flexural strength of the colored pervious concrete of the example 2 are superior to those of the comparative example 5, which shows that the addition of the whisker filler can disperse most of the stress, avoid the concentration of stress, and simultaneously cooperate with the hybrid fiber, effectively slow down the expansion of cracks and improve the compressive strength and the flexural strength of the colored pervious concrete.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The colored water permeable concrete is characterized by comprising the following components in parts by weight: 350 parts of cement 260-90 parts, 1300 parts of water 80-90 parts, 1200-1300 parts of coarse aggregate, 5-7 parts of hybrid fiber, 3-6 parts of whisker filler, 2-4 parts of silicone-acrylic emulsion, 25-35 parts of pigment and 3-5 parts of water reducer; wherein the hybrid fiber comprises steel fiber and plant fiber modified by nano calcium carbonate.
2. The colored water permeable concrete according to claim 1, wherein the modification method of the plant fiber comprises the following steps: mixing plant fiber and nano calcium carbonate at a weight ratio of (8-12) to 1, and stirring for 20-30 min.
3. The colored water permeable concrete according to claim 2, wherein the plant fiber is porous plant fiber, and the preparation method comprises the following steps:
(1) mixing acetic anhydride and xylene in a volume ratio of 1: (4-4.5) to obtain a modified solution;
(2) stirring 5-10 parts of plant fiber at 190 ℃ for 10-15min at 180 ℃ to obtain expanded plant fiber;
(3) calcining the expanded plant fiber in the step (2) at the temperature of 900-1000 ℃, then soaking the calcined expanded plant fiber in 30-40mL of the modification solution obtained in the step (1) at the temperature of 110-120 ℃ for 0.5-1.5h, filtering and drying to obtain the porous plant fiber.
4. The colored water permeable concrete according to claim 2, wherein the stirring speed is 1100-1200 r/min.
5. The colored water permeable concrete according to claim 1, wherein the steel fiber is modified steel fiber, and the modification method comprises the following steps:
1) mixing 5-8 parts of silane coupling agent, 8-12 parts of ethanol and 80-90 parts of water, and adjusting the pH to 4.3-4.7 to obtain a treatment solution;
2) adding 3-4 parts of steel fiber into the treatment solution obtained in the step 1), soaking for 8-10h, filtering and drying to obtain the modified steel fiber.
6. The colored water permeable concrete according to claim 1, wherein: the weight ratio of the steel fiber to the nano calcium carbonate modified plant fiber is 0.5-0.7.
7. The colored water permeable concrete according to claim 1, wherein: the raw material also comprises 3-6 parts of diatomite.
8. The colored water permeable concrete according to claim 1, wherein: the whisker filler comprises one or more of calcium sulfate whisker, calcium silicate whisker and alumina whisker.
9. The colored water permeable concrete according to claim 1, wherein: the silane coupling agent comprises one or two of gamma-methacryloxypropyltrimethoxysilane and gamma-methacryloxypropyltrichlorosilane.
10. A method for preparing a colored water permeable concrete according to any one of claims 1 to 9, comprising the steps of:
s1, mixing and stirring the mixed fiber and water evenly;
and S2, sequentially adding the residual materials into the mixture obtained in the step S1, and uniformly stirring to obtain the colored water-permeable concrete.
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| CN113461386A (en) * | 2021-07-21 | 2021-10-01 | 四川佰汇混凝土工程有限公司 | Colored concrete and preparation method thereof |
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