CN113024175A - Pervious concrete and preparation method and application thereof - Google Patents
Pervious concrete and preparation method and application thereof Download PDFInfo
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- CN113024175A CN113024175A CN202110520848.7A CN202110520848A CN113024175A CN 113024175 A CN113024175 A CN 113024175A CN 202110520848 A CN202110520848 A CN 202110520848A CN 113024175 A CN113024175 A CN 113024175A
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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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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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- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Structural Engineering (AREA)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides pervious concrete and a preparation method and application thereof, and relates to the field of civil engineering concrete. The pervious concrete comprises the following components in parts by weight: 60-100 parts of cement, 150 parts of pebble, 250 parts of reinforcing agent, 5-15 parts of water reducing agent, 1-10 parts of vinyl acetate resin, 2-8 parts of polymethyl acrylate and 40-60 parts of water. The bamboo pulp fiber and the bagasse fiber are added into the components, so that the mechanical property of the pervious concrete is improved; the vinyl acetate resin and the polymethyl acrylate are added, so that the mechanical property of the concrete can be improved on the basis of ensuring the water permeability of the concrete, the permeable concrete is not easy to crack after being formed, and the service life of the permeable concrete is prolonged; and the phenomenon that the pervious concrete is easy to bleed or separate in the stirring and mixing process is reduced by controlling the polymerization degree of the polymethyl acrylate.
Description
Technical Field
The invention relates to the field of civil engineering concrete, in particular to pervious concrete and a preparation method and application thereof.
Background
The pervious concrete is an ecological environment-friendly concrete which is mainly prepared by aggregate, cement, water, an additive, an admixture and the like according to a specific proportion by using a special process, has communicated pores and has a framework-gap structure, is usually used for paving the ground, not only meets the requirements of pavement construction performance and road use, but also needs to contain 15-25% of through gaps, and ensures that the water permeability of the pervious concrete ground can reach 200L/(m) under the common condition of the pervious concrete ground2·min)。
Compared with an impervious concrete pavement, the pervious concrete pavement has the following main advantages:
(1) has positive effect on urban waterlogging prevention
The torrential rain comes temporarily, and when the rainfall in the unit interval exceeded the displacement in the unit interval of urban drainage system, the rainwater began to accumulate on road surfaces such as urban streets, leads to the waterlogging, and the water permeability road surface can make the rainwater permeate the underground at once because self has good infiltration ability, has greatly increased the discharge capacity of city to the rainwater in the unit interval, can alleviate urban drainage system's drainage pressure effectively, and this is the positive effect to city flood control.
(2) Has effect of improving urban' heat island effect
The large amount of paving of impervious road surface has reduced city greenery patches, has weakened the exchange of heat and moisture between earth's surface and the air above the city, causes the evaporation to weaken, makes the atmosphere can not be cooled, leads to the temperature in the city too high. Due to the fact that a large amount of capillary water is reserved in the special porous structure and the lower soil of the permeable concrete pavement, under the irradiation of the sun, the capillary water evaporates and enters air through the permeable concrete and absorbs more heat, the temperature of the ground surface and the air is reduced, and therefore the urban heat island effect is effectively relieved.
(3) Has protective effect on urban underground water resource
The impervious pavement blocks rainwater from the soil layer, the rainwater cannot permeate into the underground water body, and the rainwater can only be drained into surface water such as rivers through the urban drainage system. For the pervious concrete pavement, rainwater can directly permeate into soil through the pervious concrete pavement and then enter an underground water body, so that underground water is supplemented in time.
(4) Can be used for reducing urban noise
The pavement of the permeable pavement can effectively absorb tire noise generated by the tire when the automobile runs, so that urban noise is effectively reduced.
At present, the research on pervious concrete is more, for example, Chinese patent application 201710461590.1 discloses pervious concrete, which comprises the following components, by weight, 70-100 parts of water; cement 300-; 1300 portions of stone and 1600 portions of stone; 1-10 parts of a water reducing agent; 1-10 parts of a synergist. According to the invention, proper proportion of water, cement and stones is adopted, and after the water reducing agent and the synergist are added, the pervious concrete achieves good water permeability and high compressive strength; secondly, after titanium dioxide/montmorillonite is added into the pervious concrete, the titanium dioxide/montmorillonite is dispersed in the cement paste, so that the compressive strength of the pervious concrete is improved; thirdly, after reinforcing material is added into the pervious concrete, the compressive strength of the pervious concrete is improved, the effects that the pervious concrete is good in water permeability and high in compressive strength and can load motor vehicles are achieved, the permeable concrete can be widely applied to squares, park roads, urban roads and the like, rainwater or melted snow water can quickly permeate into the underground, the quick water seepage effect of sponge cities is achieved, and the application does not pay attention to the tensile property and the frost resistance of the concrete and the water permeability.
Further, as disclosed in chinese patent application 201510712674.9, a permeable concrete and a permeable concrete pipe for rainwater collection are disclosed, the permeable concrete is composed of the following components in parts by weight: 80-120 parts of cement, 220-270 parts of cobble, 70-100 parts of coarse sand, 7-13 parts of silica fume or coal dust, 6-13 parts of vinyl acetate-ethylene copolymer emulsion, 0.1-0.3 part of polyethylene fiber, 25-35 parts of water and 0.8-1.3 parts of water reducing agent; the water-permeable concrete pipe is formed by bonding an arc-shaped pipe wall made of the water-permeable concrete with a common concrete pipe wall, and when the water-permeable concrete pipe is used, the common concrete pipe wall is arranged below, and the pipe wall made of the water-permeable concrete is arranged above. The prepared concrete pipe can enable the water permeability coefficient to reach 1-2mm/s, can ensure small and uniform aperture, and effectively prevents the aperture from being blocked.
Therefore, it is required to develop a pervious concrete with high porosity, good water permeability, excellent mechanical properties and good freezing resistance.
Disclosure of Invention
Based on the defects in the prior art, the invention aims to provide the pervious concrete, the concrete porosity and the water permeability are obviously improved by adding the synergist into the components and controlling the specific components of the synergist and the mass ratio of the synergist to other components, and the prepared pervious concrete has excellent mechanical property and good frost resistance.
The technical purpose of the invention is realized by the following technical scheme:
the pervious concrete comprises the following components in parts by weight: 60-100 parts of cement, 150 parts of pebble, 250 parts of reinforcing agent, 5-15 parts of water reducing agent, 1-10 parts of vinyl acetate resin, 2-8 parts of polymethyl acrylate and 40-60 parts of water.
Preferably, the pervious concrete comprises the following components in parts by weight: 70-90 parts of cement, 240 parts of stone 170-containing materials, 8-12 parts of reinforcing agents, 2-8 parts of water reducing agents, 6-9 parts of vinyl acetate resins, 3-7 parts of polymethyl acrylate and 50-60 parts of water.
Preferably, the pervious concrete comprises the following components in parts by weight: 80-90 parts of cement, 220 parts of pebble 200-one, 8-10 parts of reinforcing agent, 5-6 parts of water reducing agent, 6-8 parts of vinyl acetate resin, 5-6 parts of polymethyl acrylate and 50-55 parts of water.
The reinforcing agent is selected from one or more of bamboo pulp fiber, bagasse fiber and corn fiber;
preferably, the reinforcing agent is a mixture of bamboo pulp fibers and bagasse fibers.
The adding amount ratio of the bamboo pulp fiber to the bagasse fiber is 2-5: 1;
preferably, the adding amount ratio of the bamboo pulp fiber to the bagasse fiber is 3-4: 1;
still preferably, the ratio of the addition amount of the bamboo pulp fiber and the bagasse fiber is 3: 1.
The water reducing agent is selected from sulfamate high-efficiency water reducing agents;
the addition ratio of the vinyl acetate resin to the polymethyl acrylate is 1-4: 1;
preferably, the addition ratio of the vinyl acetate resin to the polymethyl acrylate is 2-4: 1;
more preferably, the addition ratio of the vinyl acetate resin to the polymethyl acrylate is 4: 1.
The polymerization degree of the polymethyl acrylate is 5-10; preferably, the polymerization degree of the polymethyl acrylate is 6-8; still more preferably, the degree of polymerization of the polymethyl acrylate is 8.
The cement used in the invention is conventional portland cement, the particle size of the pebbles is 15-30mm and 5-10mm, and the ratio of the particle size to the particle size is 1: 3-5; preferably 1:4.
The bamboo pulp fiber is prepared by pulping bamboo chips, then preparing the pulp from the pulp and spinning the pulp by a wet method to prepare the fiber, and the natural characteristics of the bamboo are damaged in the processing process, so that the deodorization, antibacterial and ultraviolet-proof functions of the fiber are obviously reduced; however, in the implementation process of the invention, the bamboo pulp fibers and the bagasse fibers are mixed to obviously improve the mechanical strength and the water permeability of the concrete.
According to the invention, the vinyl acetate resin and the polymethyl acrylate are added into the concrete components, so that the mechanical property of the concrete can be improved on the basis of ensuring the water permeability of the concrete, the permeable concrete is not easy to crack after being formed, the service life of the permeable concrete is prolonged, meanwhile, the consistency of the permeable concrete is improved, the bleeding rate of the permeable concrete is reduced, and the phenomenon that the permeable concrete is easy to bleed or separate in the stirring and mixing process is reduced.
The invention also provides a preparation method of the pervious concrete, which comprises the following steps:
(1) adding cement into a cement mixer, stirring, adding water, a water reducing agent, vinyl acetate resin and polymethyl acrylate while stirring, and uniformly stirring to obtain a premix 1;
(2) adding the stones and the reinforcing agent into a sandstone stirrer for stirring, and obtaining a premix 2 after uniformly stirring;
(3) and adding the premix 1 and the premix 2 into a concrete mixer for stirring, and obtaining the pervious concrete material after uniform stirring.
The invention also provides application of the pervious concrete in preparing pervious pavements and pervious pipes.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention provides the pervious concrete, which is added with the bamboo pulp fiber and the bagasse fiber, so that the mechanical property of the pervious concrete is improved, the compressive strength and the tensile property of the pervious concrete are favorably improved, and the pervious concrete is not easy to crack after being formed;
(2) according to the invention, the vinyl acetate resin and the polymethyl acrylate are added into the concrete components, so that the mechanical property of the concrete can be improved on the basis of ensuring the water permeability of the concrete, the pervious concrete is not easy to crack after being formed, and the service life of the pervious concrete is prolonged;
(3) according to the invention, the polymethyl acrylate is added into the concrete components, and the polymerization degree of the polymethyl acrylate is controlled, so that the consistency of the pervious concrete is improved, the water permeability of the pervious concrete is improved, the bleeding rate of the pervious concrete is reduced, and the phenomenon that the pervious concrete is easy to bleed or separate in the stirring and mixing process is reduced.
Drawings
FIG. 1 shows a pervious concrete prepared in example 5 of the present invention.
Detailed Description
The specific embodiments are only for explaining the present invention, and the present invention is not limited thereto, and those skilled in the art can make modifications without inventive contribution to the present embodiments as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
The raw materials in the invention are all conventional commercial products.
Example 1 pervious concrete
The paint comprises the following components in parts by weight: 60 parts of cement, 150 parts of pebbles, 4 parts of bamboo pulp fiber, 1 part of bagasse fiber, 1 part of water reducing agent, 5 parts of vinyl acetate resin, 2 parts of polymethyl acrylate and 40 parts of water.
The particle size of the stones is 15-30mm and 5-10mm, and the ratio of the two is 1: 3;
the degree of polymerization of polymethyl acrylate was 5.
The preparation method of the pervious concrete comprises the following steps:
(1) adding cement into a cement mixer, stirring, adding water, a water reducing agent, vinyl acetate resin and polymethyl acrylate while stirring, and uniformly stirring to obtain a premix 1;
(2) adding the stones and the reinforcing agent into a sandstone stirrer for stirring, and obtaining a premix 2 after uniformly stirring;
(3) and adding the premix 1 and the premix 2 into a concrete mixer for stirring, and obtaining the pervious concrete material after uniform stirring.
Example 2 pervious concrete
The paint comprises the following components in parts by weight: 100 parts of cement, 250 parts of pebbles, 12.5 parts of bamboo pulp fibers, 2.5 parts of bagasse fibers, 10 parts of water reducing agent, 10 parts of vinyl acetate resin, 8 parts of polymethyl acrylate and 60 parts of water.
The particle size of the stones is 15-30mm and 5-10mm, and the ratio of the two is 1: 5;
the degree of polymerization of polymethyl acrylate was 10.
The preparation method of the pervious concrete comprises the following steps:
(1) adding cement into a cement mixer, stirring, adding water, a water reducing agent, vinyl acetate resin and polymethyl acrylate while stirring, and uniformly stirring to obtain a premix 1;
(2) adding the stones and the reinforcing agent into a sandstone stirrer for stirring, and obtaining a premix 2 after uniformly stirring;
(3) and adding the premix 1 and the premix 2 into a concrete mixer for stirring, and obtaining the pervious concrete material after uniform stirring.
Example 3 pervious concrete
The paint comprises the following components in parts by weight: 70 parts of cement, 200 parts of pebbles, 8 parts of bamboo pulp fiber, 2 parts of bagasse fiber, 2 parts of a water reducing agent, 6 parts of vinyl acetate resin, 3 parts of polymethyl acrylate and 50 parts of water.
The particle size of the stones is 15-30mm and 5-10mm, and the ratio of the two is 1: 3.5;
the degree of polymerization of polymethyl acrylate was 6.
The preparation method of the pervious concrete comprises the following steps:
(1) adding cement into a cement mixer, stirring, adding water, a water reducing agent, vinyl acetate resin and polymethyl acrylate while stirring, and uniformly stirring to obtain a premix 1;
(2) adding the stones and the reinforcing agent into a sandstone stirrer for stirring, and obtaining a premix 2 after uniformly stirring;
(3) and adding the premix 1 and the premix 2 into a concrete mixer for stirring, and obtaining the pervious concrete material after uniform stirring.
Example 4 pervious concrete
The paint comprises the following components in parts by weight: 80 parts of cement, 220 parts of pebbles, 7.5 parts of bamboo pulp fibers, 2.5 parts of bagasse fibers, 5 parts of a water reducing agent, 6 parts of vinyl acetate resin, 6 parts of polymethyl acrylate and 50 parts of water.
The particle size of the stones is 15-30mm and 5-10mm, and the ratio of the two is 1: 4.5;
the degree of polymerization of polymethyl acrylate was 7.
The preparation method of the pervious concrete comprises the following steps:
(1) adding cement into a cement mixer, stirring, adding water, a water reducing agent, vinyl acetate resin and polymethyl acrylate while stirring, and uniformly stirring to obtain a premix 1;
(2) adding the stones and the reinforcing agent into a sandstone stirrer for stirring, and obtaining a premix 2 after uniformly stirring;
(3) and adding the premix 1 and the premix 2 into a concrete mixer for stirring, and obtaining the pervious concrete material after uniform stirring.
Example 5 pervious concrete
The paint comprises the following components in parts by weight: 90 parts of cement, 220 parts of pebbles, 7.5 parts of bamboo pulp fibers, 2.5 parts of bagasse fibers, 6 parts of a water reducing agent, 8 parts of vinyl acetate resin, 2 parts of polymethyl acrylate and 55 parts of water.
The particle size of the stones is 15-30mm and 5-10mm, and the ratio of the two is 1: 4;
the degree of polymerization of polymethyl acrylate was 8.
The preparation method of the pervious concrete comprises the following steps:
(1) adding cement into a cement mixer, stirring, adding water, a water reducing agent, vinyl acetate resin and polymethyl acrylate while stirring, and uniformly stirring to obtain a premix 1;
(2) adding the stones and the reinforcing agent into a sandstone stirrer for stirring, and obtaining a premix 2 after uniformly stirring;
(3) and adding the premix 1 and the premix 2 into a concrete mixer for stirring, and obtaining the pervious concrete material after uniform stirring.
Comparative example 1
The difference from example 5 is that: only 10 parts of bamboo pulp fiber is added into the components, bagasse fiber is not added, and other components and contents are the same as those in example 5.
Comparative example 2
The difference from example 5 is that: the addition ratio of the bamboo pulp fiber to the bagasse fiber was 1:1, that is, 5 parts of bamboo pulp fiber and 5 parts of bagasse fiber, and the other components and contents were the same as in example 5.
Comparative example 3
The difference from example 5 is that: the ratio of the addition amount of the bamboo pulp fiber to the bagasse fiber was 9:1, that is, 9 parts of bamboo pulp fiber and 1 part of bagasse fiber, and the other components and contents were the same as in example 5.
Comparative example 4
The difference from example 5 is that: only 10 parts of corn fiber is added into the components, bamboo pulp fiber and bagasse fiber are not added, and other components and contents are the same as those in example 5.
Comparative example 5
The difference from example 5 is that: the components are only added with 10 parts of vinyl acetate resin, and polymethyl acrylate is not added, and other components and contents are the same as those of the embodiment 5.
Comparative example 6
The difference from example 5 is that: only 10 parts of polymethyl acrylate is added into the components, no vinyl acetate resin is added, and other components and contents are the same as those in example 5.
Comparative example 7
The difference from example 5 is that: the addition ratio of the vinyl acetate resin to the polymethyl acrylate was 0.8:1, that is, 40/9 parts of vinyl acetate resin and 50/9 parts of polymethyl acrylate, and the other components and contents were the same as in example 5.
Comparative example 8
The difference from example 5 is that: the polymerization degree of polymethyl acrylate was 15, and the other components and contents were the same as in example 5.
Comparative example 9
The difference from example 5 is that: the polymerization degree of polymethyl acrylate was 3, and the other components and contents were the same as in example 5.
Testing the performance of the concrete:
1. test of compression resistance
The detection method comprises the following steps: the test is carried out according to the regulations of the standard of ordinary concrete mechanical property test methods (GB/T50081-2002).
The calculation formula is as follows:
fcu＝Fmax/A
wherein f-concrete cubic compressive strength (MPa); fmax-a maximum load (N); a-test piece pressure bearing area (mm)2)。
2. And (3) testing the splitting tensile strength:
the detection method comprises the following steps: the test is carried out according to the regulations of the standard of ordinary concrete mechanical property test methods (GB/T50081-2002).
The calculation formula is as follows:
fct＝2F/∏A＝0.637(F/A)
Fct-concrete split tensile strength (MPa); f ═ specimen failure load (N); a-area of cleavage plane of test piece (mm)2)。
3. And (3) testing the water permeability coefficient:
the detection method comprises the following steps: the water permeability coefficient (mm/s) of the prepared concrete was measured according to GB/T25993-2010 Standard Water permeable Cement concrete Water permeability coefficient test apparatus Specification.
4. Bleeding rate test
The detection method comprises the following steps: the bleeding rate (%) of the pervious concrete is detected according to a bleeding test in GB/T50080-2002 standard of common concrete mixture performance test methods.
5. Test for Freeze resistance
The detection method comprises the following steps: according to the test method for the long-term performance and durability of ordinary concrete
(GB/T50082-2009) by the quick freezing method.
The mass loss rate calculation formula is as follows:
△Wn＝(W0-Wn/W0)×100％
quality loss rate (%) of the test piece after delta Wn-n times of freeze-thaw cycles; w0-test piece mass (g) before freeze-thaw cycling; and (5) testing the mass (g) of the test piece after Wn-n times of freeze-thaw cycles.
TABLE 1 test results of compressive strength and 28-day cleavage tensile strength of pervious concrete prepared in examples 1-5
TABLE 2 compression Strength and 28-day cleavage tensile Strength test results of pervious concrete prepared in comparative examples 1 to 8
According to the detection data of the above tables 1-2, the pervious concrete prepared by the invention has higher mechanical properties, the 28-day tensile strength of the comparative examples 1-7 is obviously lower than the 28-day tensile strength of the examples 1-5, and the 28-day compressive strength of the comparative examples 1-7 is obviously lower than the 28-day compressive strength of the examples 1-5, which shows that the types and the proportions of the reinforcing agents and the addition amounts of the vinyl acetate resin and the polymethyl acrylate can obviously influence the 28-day tensile strength and the compressive strength of the concrete. In particular, in example 5, the mechanical properties of the concrete prepared by controlling the addition amount ratio of the bamboo pulp fibers and the bagasse fibers to be 3:1, the addition amount ratio of the vinyl acetate resin to the polymethyl acrylate to be 4:1 and the polymerization degree of the polymethyl acrylate to be 8 are the best; comparative examples 8 to 9, which change the degree of polymerization of polymethyl acrylate, are outside the scope of the present invention, and although they affect the mechanical properties of concrete, they do not affect much.
Table 3 test results of permeability coefficient and bleeding rate of permeable concrete prepared in examples 1 to 5
| Coefficient of water permeability (mm/s) | Bleeding Rate (%) | |
| Example 1 | 6.60 | 8.2 |
| Example 2 | 6.62 | 8.0 |
| Example 3 | 6.61 | 7.8 |
| Example 4 | 6.62 | 7.9 |
| Example 5 | 6.65 | 7.2 |
TABLE 4 test results of permeability coefficient and bleeding rate of pervious concrete prepared in comparative examples 1-9
| Coefficient of water permeability (mm/s) | Bleeding Rate (%) | |
| Comparative example 1 | 6.62 | 9.5 |
| Comparative example 2 | 6.61 | 8.4 |
| Comparative example 3 | 6.60 | 8.6 |
| Comparative example 4 | 6.61 | 9.6 |
| Comparative example 5 | 5.10 | 10.6 |
| Comparative example 6 | 5.06 | 10.8 |
| Comparative example 7 | 5.25 | 9.8 |
| Comparative example 8 | 4.89 | 10.3 |
| Comparative example 9 | 5.35 | 11.4 |
According to the detection data of the above table 3-4, the pervious concrete prepared by the invention has higher water permeability coefficient and lower bleeding rate, the difference between the water permeability coefficient of the comparative examples 1-4 and the water permeability coefficient of the example 5 is not large, which indicates that the water permeability of the concrete is not greatly influenced by the reinforcing agent, but the bleeding rate of the concrete is influenced to a certain extent, the water permeability coefficient of the comparative examples 5-7 is obviously smaller than that of the example 5, and the bleeding rate is obviously higher than that of the examples 1-5, which indicates that the water permeability and the bleeding rate of the concrete are obviously influenced by the addition amount and the proportion of the vinyl acetate resin and the polymethyl acrylate; the water permeability coefficients of the comparative examples 8 to 9 are also obviously smaller than those of the example 5, and the bleeding rate is obviously higher than that of the example 5, which shows that the polymerization degree of the polymethyl acrylate has great influence on the water permeability and the bleeding rate of the concrete, and particularly when the polymerization degree is large, the water permeability is obviously reduced, and the bleeding rate is obviously improved.
TABLE 5 test results of the freezing resistance of pervious concrete prepared in examples 1-5
| Mass loss rate (%) | |
| Example 1 | 4.6 |
| Example 2 | 4.5 |
| Example 3 | 4.5 |
| Example 4 | 4.0 |
| Example 5 | 3.8 |
TABLE 6 test results of freezing resistance of pervious concrete prepared in comparative examples 1-9
| Mass loss rate (%) | |
| Comparative example 1 | 4.2 |
| Comparative example 2 | 4.0 |
| Comparative example 3 | 3.9 |
| Comparative example 4 | 4.3 |
| Comparative example 5 | 5.1 |
| Comparative example 6 | 5.0 |
| Comparative example 7 | 4.8 |
| Comparative example 8 | 5.3 |
| Comparative example 9 | 5.2 |
According to the detection data of the above tables 5-6, the pervious concrete prepared by the invention has higher frost resistance, the mass loss rate after 25 times of freeze-thaw cycles is less than 5%, and particularly the mass loss rate of the concrete prepared in the example 5 is the minimum, namely 3.8%; the mass loss rates of comparative examples 1 to 4 are increased compared with example 4, but the increase degree is smaller, which shows that the reinforcing agent has smaller influence on the frost resistance of the concrete, while the mass loss rates of comparative examples 5 to 9 are obviously increased compared with example 4, which shows that the vinyl acetate resin and the polymethyl acrylate have larger influence on the frost resistance of the concrete, and particularly the polymerization degree of the polymethyl acrylate can obviously influence the frost resistance of the concrete.
In conclusion, the concrete prepared by only using the components disclosed by the invention and reasonably controlling the content of each component, particularly controlling the adding amount ratio of the bamboo pulp fiber and the bagasse fiber to be 3:1 and the adding amount ratio of the vinyl acetate resin to the polymethyl acrylate to be 4:1 and controlling the polymerization degree of the polymethyl acrylate to be 8 has better compression resistance, tensile property, frost resistance, larger water permeability coefficient and smaller bleeding rate.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. The pervious concrete is characterized in that: the paint comprises the following components in parts by weight: 60-100 parts of cement, 150 parts of pebbles, 250 parts of reinforcing agent, 5-15 parts of water reducing agent, 1-10 parts of vinyl acetate resin, 2-8 parts of polymethyl acrylate and 40-60 parts of water.
2. The pervious concrete of claim 1, wherein: the pervious concrete comprises the following components in parts by weight: 80-90 parts of cement, 220 parts of pebble 200-materials, 8-10 parts of reinforcing agent, 5-6 parts of water reducing agent, 6-8 parts of vinyl acetate resin, 5-6 parts of polymethyl acrylate and 50-55 parts of water.
3. The pervious concrete of claim 1, wherein: the reinforcing agent is selected from one or more of bamboo pulp fiber, bagasse fiber and corn fiber.
4. The pervious concrete of claim 3, wherein: the reinforcing agent is a mixture of bamboo pulp fibers and bagasse fibers; the addition ratio of the bamboo pulp fiber to the bagasse fiber is 2-5: 1.
5. The pervious concrete of claim 4, wherein: the adding amount ratio of the bamboo pulp fiber to the bagasse fiber is 3: 1.
6. The pervious concrete of claim 1, wherein: the addition ratio of the vinyl acetate resin to the polymethyl acrylate is 1-4: 1.
7. The pervious concrete of claim 6, wherein: the addition ratio of the vinyl acetate resin to the polymethyl acrylate is 4: 1.
8. The pervious concrete of claim 1, wherein: the polymerization degree of the polymethyl acrylate is 5-10; preferably, the degree of polymerization of the polymethyl acrylate is 8.
9. A method of producing the pervious concrete of any one of claims 1 to 8, characterized in that: the method comprises the following steps:
(1) adding cement into a cement mixer, stirring, adding water, a water reducing agent, vinyl acetate resin and polymethyl acrylate while stirring, and uniformly stirring to obtain a premix 1;
(2) adding the stones and the reinforcing agent into a sandstone stirrer for stirring, and obtaining a premix 2 after uniformly stirring;
(3) and adding the premix 1 and the premix 2 into a concrete mixer for stirring, and obtaining the pervious concrete material after uniform stirring.
10. Use of the pervious concrete according to any one of claims 1 to 8 for the preparation of pervious pavements and pervious pipes.
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