CN112266217A - Pervious concrete and preparation method thereof - Google Patents
Pervious concrete and preparation method thereof Download PDFInfo
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- CN112266217A CN112266217A CN202011233246.5A CN202011233246A CN112266217A CN 112266217 A CN112266217 A CN 112266217A CN 202011233246 A CN202011233246 A CN 202011233246A CN 112266217 A CN112266217 A CN 112266217A
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
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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 field of building materials, and particularly discloses pervious concrete and a preparation method thereof. The permeable concrete comprises the following components in parts by weight: 110-130 parts of water; 360-470 parts of cement; 1300-1600 parts of coarse aggregate; 1-10 parts of a water reducing agent; 1-10 parts of a synergist; 10-60 parts of a reinforcing material; 0.3-1.5 parts of an early strength agent; 0.1-2.5 parts of a thickening agent; 0.3-2.5 parts of a defoaming agent. The pervious concrete can be used for paving sidewalks and parking lots, can be used as a load pavement, and has the advantages of high strength and high water permeability.
Description
Technical Field
The application relates to the field of building materials, in particular to pervious concrete and a preparation method thereof.
Background
The eco-friendly concrete is a concrete material which can reduce the load on the global environment, can be harmoniously symbiotic with a natural ecosystem, and can construct a comfortable environment for human beings. The pervious concrete is one of eco-friendly concrete, and is also called porous concrete and sand-free concrete. The porous light concrete is prepared by mixing aggregate, cement and water, contains no or little fine aggregate, and has the characteristics of air permeability, water permeability and light weight because a thin layer of cement paste is coated on the surface of the coarse aggregate and is mutually bonded to form a honeycomb structure with uniformly distributed pores. Compared with the traditional concrete, the concrete has the biggest characteristics of 15-30% of communicated pores, air permeability and water permeability, can enlarge the water permeable and air permeable areas of cities, and has important effects on adjusting the temperature and humidity of urban air and maintaining the water level and ecological balance of underground soil. The porous structure can also absorb sound and reduce noise, thereby reducing the noise pollution of cities. The existence of large pores also enables the freeze-thaw resistance of the pervious concrete to be higher than that of the ordinary concrete.
Since the 80 s in the 20 th century, countries and regions in Europe and America began to research and develop water-permeable concrete, which is applied to squares, walking streets, roads in parks, etc. to maintain ecological balance and regulate urban microclimate. The pervious concrete in China started in the 90 s of the last century, although the pervious concrete started late, some pioneering research results are obtained, and the research on the pervious concrete is started in 1993 by the Chinese building material science research institute and is first put into practical application. The pervious concrete has good social reaction and application prospect in Beijing, Shanghai, Hangzhou, Harbin and other places, and brings ecological benefit to cities. With the continuous promotion of the construction process of sponge cities in China, the pervious concrete structure is widely applied to municipal engineering construction due to the ecological advantages of the pervious concrete structure.
In view of the above-mentioned related art, the inventors found that the problem of low compressive strength is prevalent in the interior of the water-permeable concrete due to the presence of the communicating pores. The pervious concrete is mostly used for paving sidewalks and parking lots at the present stage, and cracks often appear when the pervious concrete is used as a load pavement, so that the pervious concrete cannot bear the load of a motor vehicle, and the popularization and application of the pervious concrete are greatly limited.
Disclosure of Invention
In order to improve the compressive strength of pervious concrete, the present application provides pervious concrete and a method for preparing the same, which has high strength and high water permeability.
In a first aspect, the present application provides a pervious concrete, which adopts the following technical scheme:
the pervious concrete comprises the following components in parts by weight: 110-130 parts of water; 360-470 parts of cement; 1300-1600 parts of coarse aggregate; 1-10 parts of a water reducing agent; 1-10 parts of a synergist; 10-60 parts of a reinforcing material; 0.3-1.5 parts of an early strength agent; 0.1-2.5 parts of a thickening agent; 0.3-2.5 parts of a defoaming agent.
By adopting the technical scheme, the pervious concrete has certain gaps to meet the requirement of water permeability, and the proportion among cement, water and coarse aggregate is optimized, and then the water reducing agent and the synergist are added, so that the strength of the pervious concrete can be improved while the porosity in the pervious concrete is between 10% and 20%, and the effects of high compressive strength and good water permeability of the pervious concrete are achieved. Meanwhile, the early strength agent is added to improve the early strength of the pervious concrete; the thickening agent can play a role in retaining water, thickening, delaying hydration power of pervious concrete, improving construction performance, and simultaneously can enable the concrete to obtain proper water all the time when hydrated, so that the concrete can be fully hydrated in each stage, and the pervious concrete has higher strength after being condensed; the defoaming agent can reduce air holes in the pervious concrete, so that the pervious concrete is more compact, and a cementing layer generated by cement in the pervious concrete can tightly wrap the coarse aggregate, so that the cementing strength of the cementing layer to the coarse aggregate is higher; the reinforcing material is added into the pervious concrete, a net structure can be formed in a cementing layer system of the pervious concrete, when the pervious concrete is stressed, the cementing layer and the reinforcing material are matched, so that the bonding between coarse aggregates in the pervious concrete is tighter, and meanwhile, the reinforcing material can bear partial tensile stress, so that the compression strength and the breaking strength of the pervious concrete are improved, and the effects of high water permeability and high strength are achieved.
Preferably, the cement includes any one of ordinary portland cement and portland slag cement having a strength of not less than 42.5 Mpa.
By adopting the technical scheme, cement is used as a cementing material for forming the cementing layer of the whole system, and the cement with the strength grade not lower than 42.5Mpa is adopted, so that the strength of the cementing layer on the coarse aggregate connecting point can be improved, the higher the strength of the cementing layer is, the higher the bonding strength of the connecting point is, and the higher the strength of the pervious concrete is.
Preferably, the coarse aggregate comprises at least one of natural rock, gravel and pebble which are crushed and screened.
Through adopting above-mentioned technical scheme, above-mentioned coarse aggregate adopts artifical breakage and screening, can ensure the intensity of coarse aggregate self to and make the surface of coarse aggregate have coarse and clean surface, thereby promote the intensity of pervious concrete junction department, also be favorable to promoting the effective connectivity rate between the concrete inner space that permeates water, and then promote pervious concrete high strength and high water permeability.
Preferably, the coarse aggregate comprises crushed stone with a nominal particle size of not more than 10mm, the crushing index value of the coarse aggregate is 5-8%, and the bulk density is 1400-1600 kg/m 3.
Through adopting above-mentioned technical scheme, nominal particle diameter is no longer than 10 mm's rubble is selected for use to this application, and the crushing value of coarse aggregate is less simultaneously, and bulk density is great for tie point quantity between the coarse aggregate is more, and then on guaranteeing the basis of concrete permeability, can suitably promote the intensity of concrete that permeates water.
Preferably, the coarse aggregate comprises 5-10mm and 5-16mm continuous grade crushed stone compounded according to the weight part ratio of 1: 1.
By adopting the technical scheme, the coarse aggregate is generally divided into single grain size, discontinuous grading and continuous grading, and the continuous grade macadam compounded by 5-10mm and 5-16mm according to the weight ratio of 1:1 is selected, so that the strength of the pervious concrete can be properly improved.
Preferably, the water reducing agent comprises any one of a lignin water reducing agent, a naphthalene water reducing agent or a polycarboxylic acid water reducing agent.
Through adopting above-mentioned technical scheme, when water-reducing agent and cement mix, produce the dispersion to the cement granule, reach the effect of high-efficient water reduction, suitable water-reducing agent quantity has better slump loss resistance, maneuverability that the concrete that can better keep permeating water, the transportation of being convenient for, and the water-reducing agent can promote the early strength of the concrete that permeates water, is favorable to improving the concrete intensity that permeates water.
Preferably, the reinforcing material comprises viscose fibers, polyester fibers and polyurethane fibers, wherein the mass ratio of the viscose fibers to the polyester fibers to the polyurethane fibers is 1:1: 1.
By adopting the technical scheme, the polyester fiber has high strength, a space net structure is formed in the pervious concrete, the coarse aggregates are wrapped in the space net structure, the mutual movement among the coarse aggregates is limited, the strength of the pervious concrete is further enhanced, and the number of cracks in the concrete is reduced; the viscose fibers can play a role of a water absorption conduit in a network structure formed by the polyester fibers, so that the cement gel is uniformly diffused into gaps among the coarse aggregates along the viscose fibers, and the generation of cracks of concrete caused by nonuniform distribution of cement gel materials is reduced. The polyurethane fibers doped in the cement gel material provide certain deformation capacity for the pervious concrete, and reduce cracks of the pervious concrete caused by stress concentration; the three fibers are added, so that the pervious concrete can obtain the effects of high strength, cracking resistance and bending resistance.
Preferably, the viscose fiber is high wet modulus viscose fiber, the denier is 120-300D, the length is 10-50mm, the dry strength is 3-4Cn/dtex, and the elongation at break is 11-15%.
Through adopting above-mentioned technical scheme, because high wet modulus viscose fiber is high at initial modulus under the wet attitude, the breaking strength is high, and the fibre fineness is low, can effectually form reticular fiber structure in the concrete, improves the intensity of the concrete that permeates water.
In a second aspect, the application provides a method for preparing pervious concrete, which adopts the following technical scheme:
a preparation method of pervious concrete comprises the following steps:
s1, mixing the cement and the coarse aggregate according to a set proportion, and stirring for 30-60S to obtain a mixture;
and S2, mixing the water reducing agent, the synergist, the reinforcing material, the early strength agent, the thickening agent and the defoaming agent in proportion according to a set proportion, stirring for 30-60S, adding into the mixture, adding half of the water, stirring for 30-60S, adding the rest of the water, and uniformly stirring to obtain the pervious concrete.
By adopting the technical scheme, all components can be fully homogenized, and the cement gel in the pervious concrete can completely wrap the aggregate, so that the pervious concrete has uniform strength, easy molding and good pervious effect.
Preferably, in step S2, the viscose fibers are subjected to a deionized water washing and desizing treatment.
By adopting the technical scheme, after the sizing agent on the surface of the viscose fiber is separated, the friction coefficient of the viscose fiber is increased, the binding force with the pervious concrete is increased, and the structural strength of the pervious concrete is further improved.
In summary, the present application has the following beneficial effects:
1. by optimizing the proportion among cement, water and coarse aggregate and adding the water reducing agent and the synergist, the pervious concrete has high compressive strength and good water permeability.
2. The viscose fiber, the polyester fiber and the polyurethane fiber are preferably adopted to be mixed with the pervious concrete, the performance characteristics of the three fibers are combined, and a fiber mesh structure is formed in the pervious concrete, so that the pervious concrete obtains the effect of higher structural strength.
Drawings
Fig. 1 is a flow chart of a method provided herein.
Detailed Description
The present application will be described in further detail with reference to examples.
The water in the application adopts pure water; the cement is suitable to be selected with stable quality and higher strength, which is beneficial to the strength development of pervious concrete, so the Jingqi brand P.O42.5 produced by the Jingqi group Beijing cement factory is selected; the coarse aggregate is preferably selected to have higher cleanliness, regular shape and no obvious needle flake particles, the macadam produced by Huaiyuan Xian novel stone science and technology Limited liability company is preferably selected in the application, wherein the parameters of the macadam with 5-10mm continuous particle size fraction are as follows: the compression index value was 7.8%, the content of sludge was 0.3%, the content of clod was 0.1%, the firmness was 2%, and the bulk density was 1540kg/m3Loose packing porosity44%; the parameters of the 5-16mm continuous size fraction crushed stone are as follows: the compression index value was 8.0%, the content of sludge was 0.3%, the content of clod was 0.1%, the firmness was 2%, and the bulk density was 1450kg/m3The loose packing porosity is 40%; the water reducing agent is preferably an XG-3 polycarboxylic acid high-performance water reducing agent produced by Hebei Xucheng building materials Limited, and the water reducing rate is 34 percent; the thickening agent is carboxymethyl cellulose; the synergist is ethylene vinyl acetate emulsion; the early strength agent is sodium thiosulfate; the defoaming agent comprises at least one of polyalcohol defoaming agent or polysiloxane defoaming agent powder. The viscose fiber in the application is a high wet modulus viscose fiber, the polymerization degree of the high wet modulus viscose fiber is less than 800, the denier of the high wet modulus viscose fiber is 120D, the length of the high wet modulus viscose fiber is 10mm, the dry strength of the high wet modulus viscose fiber is 3Cn/dtex, the elongation at break of the high wet modulus viscose fiber is 11%, and the polymerization degree of the high wet modulus viscose fiber is 500; the length of the polyester fiber is 20mm, and the dry strength is 4 Cn/dtex; the polyurethane fiber length was 20mm, denier was 20D, and elongation at break was 400%.
Examples
Example 1: the pervious concrete is prepared by the following method
S1, respectively weighing 448kg of P.O42.5 cement, 770kg of 5-10mm broken stone and 770kg of 5-16mm broken stone, and putting the weighed materials into a stirrer together to stir for 30-60S to obtain a mixture;
s2, washing and desizing viscose fibers by deionized water, and performing electron beam radiation degradation, wherein the irradiation time is 10min and the irradiation dose is 10 kGy; soaking the polyurethane fiber in 0.2% sodium hydroxide solution for 10min, cleaning and desizing to obtain the polyurethane fiber with a clean surface and an increased friction coefficient;
and then respectively taking 5.4kg of water reducing agent, 10kg of synergist, 20kg of viscose fiber, 20kg of polyester fiber, 20kg of polyurethane fiber, 1.5kg of early strength agent, 2.5kg of thickening agent and 2.5kg of defoaming agent, stirring for 30-60 s, adding into the mixture, adding 65kg of water, stirring for 30-60 s, finally adding 65kg of water, and uniformly stirring to obtain the pervious concrete.
The remaining examples are different from example 1 in the amount of raw materials added, and are specifically shown in table 1.
TABLE 1 raw material addition amount of each example
Comparative example
Comparative example 1
Comparative example 1 differs from example 3 in that: in comparative example 1, no reinforcing material was added, and the rest was the same as example 3.
Comparative example 2
Comparative example 2 differs from example 3 in that: in the comparative example 2, the addition amount of crushed stone of 5-10mm is 1540kg, and crushed stone of 5-16mm is not added; the rest of the process was the same as example 3.
Comparative example 3
Comparative example 3 differs from example 3 in that: in the comparative example 3, the addition amount of crushed stone of 5-16mm is 1540kg, and crushed stone of 5-10mm is not added; the rest of the process was the same as example 3.
Performance test
The pervious concrete prepared by the embodiment and the comparative proportion is prepared into a standard test block according to GB/T50010 concrete structure design specification, and the compressive strength and the water permeability measured at 28 days have 95% of guarantee rate. The performance indexes of the pervious concrete standard test blocks prepared in the above examples and comparative examples are shown in table 2.
TABLE 2 Performance test results for each example and comparative pervious concrete
Can see from above-mentioned table, the pervious concrete in this application has good compressive strength and water permeability, and its result of use preferred satisfies pervious concrete's construction specification requirement.
Compared with example 3, in comparative example 1, viscose fiber, polyester fiber and polyurethane fiber are not added, the cement gel and the coarse aggregate are bonded only by the bonding force of the cement gel, and the bonding capability between the cement gel and the coarse aggregate is weak, so that the cementing layer is easily damaged under the impact force of cement in the water permeable process, the water permeable channel is blocked, and the strength of the water permeable concrete is reduced.
Compared with example 3, in comparative example 2 and comparative example 3, only 5-10mm crushed stones and 5-16mm continuous grade crushed stones are added respectively, the pervious concrete reaction system only has a single coarse aggregate component, the single coarse aggregate component increases the porosity in the concrete system, and the concrete system is unstable, so that the strength of the prepared pervious concrete is reduced. Meanwhile, because the system in the concrete is unstable, the cementing layer formed by the cement slurry and the coarse aggregate is easily damaged, resulting in the deterioration of the water permeability of the concrete.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The pervious concrete is characterized by comprising the following components in parts by weight: 110-130 parts of water; 360-470 parts of cement; 1300-1600 parts of coarse aggregate; 1-10 parts of a water reducing agent; 1-10 parts of a synergist; 10-60 parts of a reinforcing material; 0.3-1.5 parts of an early strength agent; 0.1-2.5 parts of a thickening agent; 0.3-2.5 parts of a defoaming agent.
2. The pervious concrete of claim 1, wherein: the cement comprises any one of ordinary portland cement and slag portland cement with the strength not lower than 42.5 Mpa.
3. The pervious concrete of claim 1, wherein: the coarse aggregate comprises at least one of natural rock, sand and pebble which are crushed and screened.
4. A transparent article according to claim 1The water concrete is characterized in that: the coarse aggregate comprises gravels with the nominal grain diameter not more than 10mm, the crushing index value of the coarse aggregate is 5-8%, and the bulk density is 1400-1600 kg/m3。
5. The pervious concrete of claim 1, wherein: the coarse aggregate comprises 5-10mm and 5-16mm continuous grade macadam compounded according to the weight part ratio of 1: 1.
6. The pervious concrete of claim 1, wherein: the water reducing agent comprises any one of a lignin water reducing agent, a naphthalene water reducing agent or a polycarboxylic acid water reducing agent.
7. The pervious concrete of claim 1, wherein: the reinforcing material comprises viscose fibers, polyester fibers and polyurethane fibers, wherein the mass ratio of the viscose fibers to the polyester fibers to the polyurethane fibers is 1:1: 1.
8. The pervious concrete of claim 7, wherein: the viscose fiber is high wet modulus viscose fiber, the denier is 120-300D, the length is 10-50mm, the dry strength is 3-4Cn/dtex, and the elongation at break is 11-15%.
9. The method for producing a pervious concrete according to any one of claims 1 to 8, characterized in that: the method comprises the following steps:
s1, mixing the cement and the coarse aggregate according to a set proportion, and stirring for 30-60S to obtain a mixture;
and S2, mixing the water reducing agent, the synergist, the reinforcing material, the early strength agent, the thickening agent and the defoaming agent in proportion according to a set proportion, stirring for 30-60S, adding into the mixture, adding half of the water, stirring for 30-60S, adding the rest of the water, and uniformly stirring to obtain the pervious concrete.
10. The method for preparing pervious concrete according to claim 9, wherein the method comprises the following steps: in step S2, the viscose fibers are washed and desized with deionized water.
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| CN113045281A (en) * | 2021-03-15 | 2021-06-29 | 浙江寰龙环境科技有限公司 | Premixed pervious concrete and preparation process thereof |
| CN113912354A (en) * | 2021-11-23 | 2022-01-11 | 上海建工建材科技集团股份有限公司 | Enhanced polymer modified pervious concrete |
| CN114349410A (en) * | 2022-01-28 | 2022-04-15 | 长沙理工检测咨询有限责任公司 | High-strength pervious concrete |
| CN115140971A (en) * | 2022-07-26 | 2022-10-04 | 李雪梅 | Anti-freezing and thawing pervious concrete and preparation method thereof |
| CN115650654A (en) * | 2022-10-31 | 2023-01-31 | 常州市水利规划设计院有限公司 | Anti-blocking permeable concrete and preparation method thereof |
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| CN115650654A (en) * | 2022-10-31 | 2023-01-31 | 常州市水利规划设计院有限公司 | Anti-blocking permeable concrete and preparation method thereof |
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