CN115057665A

CN115057665A - Pervious concrete and production process thereof

Info

Publication number: CN115057665A
Application number: CN202210642099.XA
Authority: CN
Inventors: 王庆飞; 康华炜; 黄祖华
Original assignee: Xiamen Haitou Building Materials Co ltd
Current assignee: Xiamen Haitou Building Materials Co ltd
Priority date: 2022-06-08
Filing date: 2022-06-08
Publication date: 2022-09-16

Abstract

The application relates to the field of concrete, and specifically discloses pervious concrete, which comprises the following components in parts by mass: 340 portions and 350 portions of cement; 95-110 parts of water; 1200 and 1350 parts of gravels; 35-40 parts of fly ash; 3-5 parts of an additive; 7-15 parts of ABS resin; 5-12 parts of calcium acetate. The application also discloses a production process of the pervious concrete, which comprises the following steps: s1: uniformly mixing cement, broken stone, water, fly ash and an additive according to a formula to obtain a cement premixing material; s2: then adding ABS resin and calcium acetate into the cement premixing material, and uniformly mixing to obtain a mixture; s3: and pouring the mixture into a mould, and curing to obtain the pervious concrete. This application has the effect that improves the compressive strength of concrete that permeates water.

Description

Pervious concrete and production process thereof

Technical Field

The application relates to the field of concrete, in particular to pervious concrete and a production process thereof.

Background

The pervious concrete is also called porous concrete, and is a porous light concrete which is prepared by mixing aggregate, cement, reinforcing agent and water, and does not contain fine aggregate. The pervious concrete has a cellular structure with uniformly distributed pores formed by coating a thin cement layer on the surface of a coarse aggregate and bonding the thin cement layers, and has the characteristics of air permeability, water permeability and light weight.

With increasing importance of human beings on improving ecological environment and protecting home, the pervious concrete is also getting more and more applications. The pervious concrete is particularly suitable for being used on the ground and the road surface of urban parks, residential quarters, industrial parks, stadiums, schools, hospitals, parking lots and the like.

However, due to the loose and porous structure of the pervious concrete, the compressive strength of the pervious concrete is easily reduced, and the normal use of the pavement is affected. Thus, there is still room for improvement.

Disclosure of Invention

In order to improve the compressive strength of pervious concrete, the application provides pervious concrete and a production process thereof.

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:

340 portions and 350 portions of cement;

95-110 parts of water;

1200 and 1350 parts of gravels;

35-40 parts of fly ash;

3-5 parts of an additive;

7-15 parts of ABS resin;

5-12 parts of calcium acetate.

By adopting the technical scheme, the ABS resin is a graft copolymer obtained by copolymerizing three monomers of acrylonitrile, styrene and butadiene, and the ABS resin is added into the concrete, so that the pervious concrete has good low-temperature resistance and good chemical corrosion resistance. In addition, by adding the calcium acetate and the ABS resin for mutual matching, the phenomenon of segregation of the pervious concrete in the stirring process is favorably reduced, so that the compressive strength of the pervious concrete is enhanced.

Preferably, the pervious concrete comprises the following components in parts by weight:

342 parts of cement;

100 parts of water;

1300 parts of crushed stone;

38 parts of fly ash;

3.8 parts of an additive;

10 parts of ABS resin;

and 9 parts of calcium acetate.

By adopting the technical scheme, the components in the specific proportion are matched with each other, so that the compressive strength of the pervious concrete is further improved, the crack resistance of the pervious concrete is improved, and the normal use of the pavement is better ensured.

Preferably, the pervious concrete further comprises a pigment.

Through adopting above-mentioned technical scheme, through adding pigment in the concrete, dye the concrete for the concrete that permeates water possesses different colors, can lay the construction according to environment and individual character decoration style of difference, makes the road surface bring out the best in each other with the environment on every side, has better aesthetic feeling.

However, the applicant finds that pigment particles are easy to agglomerate after the pigment is added, and through a large amount of experimental researches, the ABS resin influences the pigment particles, and the influence on the pigment particles after the ABS resin is added can be solved by adding calcium acetate, so that pigment particles are uniformly dispersed in concrete, and the agglomeration among the pigment particles is not easy to occur.

Preferably, the pigment is an iron oxide pigment.

Through adopting above-mentioned technical scheme, adopt the iron oxide pigment for pigment homodisperse more easily in the concrete is favorable to improving the glossiness of the concrete surface course that permeates water, and then makes the road surface have better aesthetic feeling.

Preferably, the pervious concrete further comprises the following components in parts by weight:

1.5-3 parts of cellulose;

2-5 parts of polyvinylpyrrolidone.

Through adopting above-mentioned technical scheme, mutually support through adopting cellulose and polyvinylpyrrolidone, form even and closely network structure, the pigment granule is wrapped up in network structure, make the pigment granule after the dispersion be difficult to appear the tendency of spontaneous gathering, and then improve the stability of pigment granule, so that the pigment granule is difficult to bump once more and connect the combination, reduce the flocculation of pigment granule, thereby promote the synergism with ABS resin and acetic acid, from this when making the compressive strength of the concrete that permeates water improve, make the concrete face layer colour that permeates water lastingly not take place to fade.

Preferably, the cellulose is hydroxyethyl methyl cellulose.

By adopting the technical scheme, as the hydroxyl on the hydroxyethyl methyl cellulose molecule and the oxygen atom on the ether bond can be associated with the water molecule to form a hydrogen bond, the cement is more tightly wrapped on the surface of the macadam and filled in the net structure formed by the cellulose and the polyvinylpyrrolidone, the cement-pigment particle connecting force can be improved, the cement-pigment particle is less prone to separation, and the purpose of lasting and fastness of the color of the pervious concrete surface layer is achieved.

Preferably, the pervious concrete further comprises a silicone resin.

By adopting the technical scheme, the organic silicon resin forms the hydrophobic layer on the surface of the cement paste, so that the cement paste is not easy to be wetted by water, the water is not easy to permeate into the cement paste, the water permeability of the pervious concrete is improved, and the erosion and freeze-thaw damage caused by the rainwater accumulated in the pervious concrete for a long time are reduced.

Preferably, the admixture comprises a polycarboxylic acid high-performance water reducing agent.

By adopting the technical scheme, the polycarboxylic acid high-performance water reducing agent has good compatibility with cement, so that the slump retention performance of concrete is good, the mixing amount is low, the water reducing rate is high, the shrinkage is small, and the early and later strength of the concrete can be greatly improved.

In a second aspect, the present application provides a pervious concrete production process, which adopts the following technical scheme:

a production process of pervious concrete comprises the following steps:

s1: uniformly mixing cement, broken stone, water, fly ash and an additive according to a formula to obtain a cement premixing material;

s2: then adding ABS resin and calcium acetate into the cement premixing material, and uniformly mixing to obtain a mixture;

s3: and pouring the mixture into a mould, and curing to obtain the pervious concrete.

By adopting the technical scheme, the pervious concrete obtained by the components according to the method has better water permeability and compressive strength, and the production process is simple and convenient, so that the industrial production is easier.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by adopting the mutual matching of the calcium acetate and the ABS resin, the phenomenon of segregation of the pervious concrete in the stirring process is favorably reduced, so that the compressive strength of the pervious concrete is enhanced.

2. By adding the calcium acetate, the influence on the pigment particles after the ABS resin is added can be avoided, so that the pigment particles are uniformly dispersed in the concrete, and the pigment particles are not easy to agglomerate.

3. Through adopting cellulose and polyvinylpyrrolidone to mutually support, form even and closely network structure, be favorable to reducing the flocculation of pigment granule to promote the synergism with ABS resin and acetic acid, make the compressive strength of the concrete that permeates water when improving from this, make the concrete surface course colour that permeates water be difficult to take place to fade lastingly.

Detailed Description

The present application will be described in further detail with reference to examples.

Example 1

The embodiment discloses pervious concrete which comprises the following components in parts by mass:

cement; water; crushing stone; fly ash; an additive; an ABS resin; calcium acetate.

Wherein the ABS resin is selected from PA-709P sold by Shanghai gold plastic jade plastic material Co.

The embodiment also discloses a production process of the pervious concrete, which comprises the following steps:

s1: uniformly mixing cement, crushed stone, water, fly ash and an additive according to a formula (the specific dosage is shown in table 1) at a rotating speed of 120r/min to obtain a cement premixing material;

s2: then adding ABS resin and calcium acetate into the cement premixed material, and uniformly mixing at the rotating speed of 100r/min to obtain a mixture;

s3: pouring the mixture into a mold, tamping, covering sponge on the surface of the concrete, spraying water to the sponge, maintaining the sponge in a moist and dripless state, curing for 3 days, removing the sponge, standing and curing for 7 days to obtain the pervious concrete.

Examples 2 to 3

The difference from example 1 is that: the amount of each component is different, and the specific amount is shown in table 1. The units of the amounts of the components in Table 1 are in kg.

TABLE 1

Example 4

The difference from example 3 is that: s1 also includes 1kg of iron oxide pigment.

Example 5

The difference from example 3 is that: s1 also contains 2kg of silicone resin.

Example 6

The differences from example 4 are: 1.5kg of hydroxyethyl methyl cellulose and 2kg of polyvinylpyrrolidone are mixed uniformly in advance, and then the mixture is added into the S1 mixture and mixed uniformly with other components.

Example 7

The difference from example 4 is that: 3kg of hydroxyethyl methyl cellulose and 5kg of polyvinylpyrrolidone are mixed uniformly in advance, and then the mixture S1 is added to be mixed with other components uniformly.

Example 8

The difference from example 7 is that: the polyvinylpyrrolidone was replaced with an equal amount of hydroxyethyl methylcellulose.

Example 9

The difference from example 7 is that: the hydroxyethyl methylcellulose was replaced by an equal amount of polyvinylpyrrolidone.

Example 10

The difference from example 3 is that:

the pervious concrete comprises the following components in parts by mass:

342kg of cement; 100kg of water; 1300kg of crushed stone; 38kg of fly ash; 3.8kg of polycarboxylic acid high-performance water reducing agent; 10kg of ABS resin; 9kg of calcium acetate; 1.3kg of iron oxide pigment; 2kg of organic silicon resin; 3kg of hydroxyethyl methyl cellulose; 5kg of polyvinylpyrrolidone.

Comparative example 1

The difference from example 3 is that: no ABS resin and calcium acetate were added in S2.

Comparative example 2

The difference from example 3 is that: no ABS resin was added in S2.

Comparative example 3

The difference from example 3 is that: no calcium acetate was added in S2.

Comparative example 4

The difference from example 3 is that:

the pervious concrete comprises the following components in parts by mass:

300kg of cement; 80kg of water; 1450kg of broken stones; 65kg of fly ash; 7kg of polycarboxylic acid high-performance water reducing agent; 4kg of ABS resin; 2kg of calcium acetate; pigment 2 kg.

Comparative example 5

The difference from example 3 is that:

the pervious concrete comprises the following components in parts by mass:

368kg of cement; 150kg of water; 1000kg of crushed stone; 27kg of fly ash; 1kg of polycarboxylic acid high-performance water reducing agent; 20kg of ABS resin; 18kg of calcium acetate; 0.4kg of pigment.

Experiment 1

According to GB/T50081-2002 Standard of mechanical property test methods of common concrete, the experiment respectively detects the 28d compressive strength (MPa) of the pervious concrete prepared in the embodiment and the comparative example.

Experiment 2

According to GB/T25993-2010 specification of a standard permeable cement concrete permeability coefficient test device, the permeability coefficient (mm/s) of the permeable concrete prepared according to the embodiment and the comparative example is detected respectively in the experiment.

Experiment 3

According to the rapid freeze-thaw cycle experimental method in GB/T50082-2009 test method Standard for testing long-term performance and durability of ordinary concrete, the experiment respectively detects the mass loss rate (%) of the pervious concrete prepared in the embodiment and the proportion after 25 times of freeze-thaw cycle, and the smaller the mass loss rate, the better the frost resistance of the pervious concrete.

Experiment 4

In this experiment, the color change of the pervious concrete prepared in the above examples and comparative examples was observed after one month, and the color change was evaluated by using the durability rating, and the specific evaluation is shown in table 2. The lower the durability rating, the less likely the pervious concrete will fade.

TABLE 2

Grade	Evaluation of durability
		1	Does not fade
2	A small part fading
		3	Large area fading

The above experimental data are shown in Table 3.

TABLE 3

Comparing the data of comparative examples 1-3 in the table 3 with that of example 3 respectively, wherein ABS resin and calcium acetate are not added in the comparative example 1, ABS resin is not added in the comparative example 2, calcium acetate is not added in the comparative example 3, the 28d compressive strength of the pervious concrete in the comparative examples 1-3 is basically similar, and the water permeability coefficient is also basically similar; in the embodiment 3, the ABS resin and the calcium acetate are added simultaneously, the 28d compressive strength is increased from about 24MPa to 31.5MPa, and the water permeability coefficient is increased from about 5mm/s to 7.3mm/s, which shows that the ABS resin and the calcium acetate are added simultaneously to be matched with each other, so that the compressive strength of the pervious concrete is improved, and meanwhile, the water permeability of the pervious concrete is improved.

According to the data analysis of the embodiment 4 and the embodiment 3 in table 3, the iron oxide pigment is further added in the embodiment 4, but after the pigment is added, the ABS resin can affect the pigment particles, so that the pigment is agglomerated, because a large amount of negative charges are accumulated on the surface of the pigment particles, and the ABS resin contains styrene, wherein benzene is an electron-rich group, and the vinyl group obtains electrons to become negative groups, and the negative groups repel each other with the negative charges on the surface of the pigment particles, so that the surface charges are easily concentrated on the corners and the protrusions of the pigment particles, and further the pigment particles are attracted to each other, and the sharp corners are contacted with each other, so that the pigment particles are easily agglomerated.

And by adding calcium acetate, the influence on the pigment particles after the ABS resin is added can be solved, so that the pigment particles are uniformly dispersed in concrete, and the pigment particles are not easy to agglomerate. This is because when calcium acetate is incorporated into concrete, negative charges on the surface of the pigment particles are combined with calcium ions in the calcium acetate, so that the negative charges on the surface of the pigment particles are reduced, and thus repulsion between the pigment particles and electrons of vinyl groups in the ABS resin is reduced, so that the pigment particles are uniformly dispersed in the concrete, thereby making agglomeration between the pigment particles less likely to occur.

As can be seen from the comparison of the data of example 5 and example 3 in Table 3, the water permeability coefficient of example 5 is increased from 7.3mm/s to 8.5mm/s, and the mass loss rate is decreased from 0.13% to 0.09% by adding the silicone resin, which indicates that the addition of the silicone resin is beneficial to improving the water permeability of the pervious concrete and the frost resistance of the pervious concrete. The hydrophobic layer is formed on the surface of the cement paste by the organic silicon resin, so that the cement paste is not easy to wet by water, and further the water is not easy to permeate into the cement paste, so that the water permeability of the pervious concrete is improved, and the erosion and freeze-thaw damage caused by the rainwater accumulated in the pervious concrete for a long time are reduced.

According to the data of examples 6-9 in Table 3, which are compared with the data of example 4, respectively, it can be seen that the compression strength of 28d is basically similar and the durability grade is basically similar in example 8 and example 4, the hydroxyethyl methyl cellulose is added on the basis of example 4, and the polyvinylpyrrolidone is added on the basis of example 4, respectively, in example 9, in examples 8-9. However, in examples 6 to 7, on the basis of example 4, hydroxyethyl methyl cellulose and polyvinylpyrrolidone are added simultaneously, the 28d compressive strength is increased from 31.4MPa to about 33MPa, and the durability rating is 1, which indicates that adding hydroxyethyl methyl cellulose and polyvinylpyrrolidone simultaneously in cooperation not only is beneficial to improving the compressive strength of the pervious concrete, but also makes the color of the pervious concrete not easy to fade, so that the pavement has better aesthetic feeling. The reason is that cellulose and polyvinylpyrrolidone are mutually matched to form an even and compact network structure, and pigment particles are wrapped in the network structure, so that the dispersed pigment particles are not prone to spontaneous aggregation, the stability of the pigment particles is further improved, the pigment particles are not prone to being collided and combined again, the flocculation of the pigment particles is reduced, the synergistic effect of ABS resin and acetic acid is promoted, the compressive strength of the pervious concrete is improved, and the surface color of the pervious concrete is ensured not to fade for a long time.

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: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The pervious concrete is characterized in that: the paint comprises the following components in parts by mass:

340 portions of cement and 350 portions of cement;

95-110 parts of water;

1200 and 1350 parts of gravels;

35-40 parts of fly ash;

3-5 parts of an additive;

7-15 parts of ABS resin;

5-12 parts of calcium acetate.

2. The pervious concrete of claim 1, wherein: the pervious concrete comprises the following components in parts by weight:

342 parts of cement;

100 parts of water;

1300 parts of crushed stone;

38 parts of fly ash;

3.8 parts of an additive;

10 parts of ABS resin;

and 9 parts of calcium acetate.

3. The pervious concrete according to any one of claims 1-2, characterized in that: the pervious concrete also comprises a pigment.

4. The pervious concrete of claim 3, wherein: the pigment is an iron oxide pigment.

5. The pervious concrete of claim 4, wherein: the pervious concrete also comprises the following components in parts by mass:

1.5-3 parts of cellulose;

2-5 parts of polyvinylpyrrolidone.

6. The pervious concrete of claim 5, wherein: the cellulose is hydroxyethyl methyl cellulose.

7. The pervious concrete according to any one of claims 1-2, characterized in that: the pervious concrete also comprises a silicone resin.

8. The pervious concrete according to any one of claims 1-2, characterized in that: the admixture comprises a polycarboxylic acid high-performance water reducing agent.

9. A process for the production of pervious concrete according to any one of claims 1 to 8, characterized in that: the method comprises the following steps: