CN113277802B - High-permeability concrete using recycled aggregate and preparation method thereof - Google Patents

Abstract

The application relates to the field of building materials, and particularly discloses high-permeability concrete using recycled aggregate and a preparation method thereof. The high-permeability concrete using the recycled aggregate comprises the following components: cement; water; sand with a particle size of 0.35-0.5 mm; crushed stone with the particle size of 5-16 mm; crushed stone with the particle size of 16-25 mm; incinerating the slag; a water reducing agent; an additive. The preparation method comprises the following steps: the method comprises the following steps: step (1), preparing a premix; step (2), preparing an intermediate mixture; step (3), preparing concrete mixture; and (4) curing and forming to prepare the high-permeability concrete using the recycled aggregate. The concrete can be used for recycling the incinerator slag, and has the advantages of energy conservation and environmental protection; in addition, the preparation method has the advantage of simple and convenient preparation.

Description

High-permeability concrete using recycled aggregate and preparation method thereof

Technical Field

The application relates to the field of concrete, in particular to high-permeability concrete using recycled aggregate and a preparation method thereof.

Background

With the rapid promotion of urbanization and the development of production and life of people, a great amount of domestic garbage is a serious social problem. The development process of developed countries shows that the waste incineration treatment and comprehensive utilization are the most effective means for realizing reduction, harmlessness and reclamation of the waste. At present, domestic waste incineration plants are built or operated in many cities. However, the waste incineration generates incineration slag, the utilization rate of the incineration slag only reaches about 10%, most of the incineration slag needs to enter a landfill site for landfill treatment, a large amount of land needs to be occupied, so that great pressure is easily caused on the landfill storage capacity around the city, and secondary pollution is easily caused to the environment.

Meanwhile, the demand of large-scale urbanization and infrastructure construction for concrete is steadily increasing, and the resources of sandstone aggregates and cement raw materials required for preparing concrete are increasingly tense. At present, china has a plurality of regions, particularly coastal regions, with the dilemma of natural river sand resource reduction, quality reduction, limited mining or mining prohibition. Therefore, the use of incinerator slag as a substitute material for concrete is becoming an increasingly common choice today.

In view of the above-mentioned related technologies, the inventor believes that, by using the incinerator slag as the recycled aggregate to replace the raw material of the concrete, since the incinerator slag is mostly powdery substance, the whole incinerator slag is thin, which is liable to cause great influence on the compressive strength of the concrete, and even may cause the compressive strength of the concrete to fail to meet the use requirement, especially for the concrete with high water permeability, the concrete with high water permeability has a loose and porous structure in order to meet the water permeability, and the structural strength itself is not high. Thus, there is still room for improvement.

Disclosure of Invention

In order to enable the structural strength of the concrete not to be influenced by the recycled aggregate of the incinerator slag, the application provides the high-permeability concrete using the recycled aggregate and the preparation method thereof.

In a first aspect, the application provides a high permeable concrete using recycled aggregate, which adopts the following technical scheme:

the high-permeability concrete using the recycled aggregate comprises the following components in parts by mass:

133-143 parts of cement;

160-170 parts of water;

820-840 parts of sand with the particle size of 0.35-0.5 mm;

120-130 parts of crushed stone with the particle size of 5-16 mm;

870-880 parts of crushed stone with the particle size of 16-25 mm;

170-180 parts of incineration slag;

2-4 parts of a water reducing agent;

3-5 parts of an additive.

Through adopting above-mentioned technical scheme, through adopting specific particle diameter and specific proportion's sand and rubble and incineration slag aggregate of formation concrete in coordination, be favorable to the concrete to form porous structure better in order to improve the water permeability, simultaneously, still make the porous structure of concrete be difficult to cause the influence to the compressive strength performance of concrete, be favorable to guaranteeing the water permeability and the intensity performance of concrete simultaneously better, make incineration slag can furthest reuse in building material, be favorable to improving the utilization ratio of resource, still be favorable to reducing the influence of incineration slag to the environment better.

Preferably, the water reducing agent is a polycarboxylic acid water reducing agent.

By adopting the technical scheme, the polycarboxylate superplasticizer is beneficial to improving the water reducing rate of the concrete and simultaneously is beneficial to better improving the compatibility of the incinerator slag with other aggregates and cement, so that the incinerator slag is more easily and uniformly blended with other components in the concrete, the compressive strength of the concrete is favorably improved, and the compressive strength of the concrete is more difficult to be influenced by the incinerator slag.

Preferably, the feed also comprises the following components in parts by mass:

1-2 parts of kaolin;

0.3-1 part of syrup.

Through adopting above-mentioned technical scheme, kaolin and syrup are cooperateed, and kaolin and incineration slag blend evenly, are favorable to improving the compatibility of incineration slag and syrup to be favorable to improving the stickness of incineration slag better, make incineration slag more easily with the concrete in other material blend evenly, make incineration slag be difficult to cause the influence to the compressive strength of concrete, be favorable to improving the compressive strength of concrete better.

Preferably, the admixture includes at least a reinforcing agent.

Through adopting above-mentioned technical scheme, through adding the reinforcing agent, be favorable to improving the compressive strength of concrete better for the compressive strength of concrete is difficult to receive pervious porous structure's influence more.

Preferably, the reinforcing agent comprises one or more of silicon dioxide, aluminum oxide, ferric pyrophosphate, magnesium sulfate, borax and montmorillonite.

Through adopting above-mentioned technical scheme, one or more material among the aforesaid is favorable to improving the compressive strength of concrete better for the compressive strength of concrete is difficult to receive pervious porous structure's influence more.

Preferably, the reinforcing agent is prepared by uniformly mixing borax and ferric pyrophosphate in a mass ratio of 2 (3-6).

By adopting the technical scheme, the borax and the ferric pyrophosphate with specific mass proportion are cooperatively matched as the reinforcing agent, so that the compressive strength of the concrete is favorably improved, the water permeability of the concrete is not easily influenced, the water permeability and the strength performance of the concrete are favorably balanced, and the compressive strength and the water permeability of the concrete are better ensured.

Preferably, the admixture further comprises a silane impregnant.

By adopting the technical scheme, the corrosion resistance and the waterproof performance of the concrete are favorably and better improved, so that the concrete is less prone to erosion of permeated water, the strength performance of the concrete is less prone to influence, and the durability of the concrete is favorably and better prolonged.

Preferably, the mass ratio of the silane impregnant to the reinforcing agent is 1: (1-3).

By adopting the technical scheme, the silane impregnant and the reinforcing agent in a specific mass ratio are cooperatively compounded, so that the silane impregnant and the reinforcing agent are favorably and cooperatively promoted with each other better, the corrosion resistance of the concrete is favorably improved, and the compressive strength of the concrete is favorably improved.

In a second aspect, the present application provides a method for preparing a highly permeable concrete using recycled aggregate, which adopts the following technical scheme:

a preparation method of high-permeability concrete using recycled aggregate comprises the following steps:

step (1), mixing cement, sand with the grain size of 0.5-0.35mm, broken stone with the grain size of 5-16mm, broken stone with the grain size of 16-25mm, incinerator slag and water with the mass of 1/2, and stirring and mixing uniformly to form a premix;

step (2), adding a water reducing agent and an additive into the premix, and uniformly stirring to form an intermediate mixture;

step (3), adding the residual 1/2 mass of water into the intermediate mixture, and uniformly stirring to obtain a concrete mixture;

and (4) pouring the concrete mixture into a template, and curing and forming to obtain the high-permeability concrete using the recycled aggregate.

Preferably, 1-2 parts by weight of kaolin and 0.3-1 part by weight of syrup are also added in the step (1).

By adopting the technical scheme, the adding sequence of the components is controlled, so that the components can be better and uniformly mixed to be better cooperated with each other, the components can better play a role, and the prepared concrete can better ensure the water permeability and the strength performance at the same time.

In summary, the present application has the following beneficial effects:

1. because this application adopts specific particle diameter specific mass proportion's sand and rubble and incineration furnace sediment to compound in coordination, be favorable to the concrete to form firm porous permeable structure, be favorable to the concrete to guarantee water permeability and strength properties better.

2. Preferably, kaolin and syrup are adopted to be compounded in a synergistic mode to improve the compatibility of the incinerator slag and other components of the concrete, so that the incinerator slag and the other components are mixed uniformly more easily and are not easy to influence the compressive strength of the concrete, and the concrete is favorably ensured to have water permeability and strength performance at the same time.

3. The method is favorable for better and uniform blending of the components by controlling the adding sequence of the components, thereby better playing a role and being favorable for better ensuring the water permeability and the strength performance of the concrete.

Detailed Description

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

The following examples and comparative raw material sources are shown in table 1.

Table 1 raw material source table

Example 1

The embodiment discloses a high-permeability concrete using recycled aggregate, which comprises the following components in parts by mass:

133kg of cement; 170kg of water; 830kg of sand with the grain diameter of 0.35-0.5 mm; 120kg of crushed stone with the particle size of 5-16 mm; 880kg of gravels with the particle size of 16-25 mm; 175kg of incinerator slag; 2kg of calcium lignosulfonate water reducing agent; 5kg of additive.

In this example, the additive was aluminum sulfate.

The embodiment also discloses a preparation method of the high-permeability concrete by using the recycled aggregate, which comprises the following steps:

step (1), adding 133kg of cement, 830kg of sand with the grain diameter of 0.35-0.5mm, 120kg of crushed stone with the grain diameter of 5-16mm, 880kg of crushed stone with the grain diameter of 16-25mm, 175kg of incinerator slag and 85kg of water into a stirrer, and uniformly stirring to form a premix.

And (2) continuously adding 2kg of calcium lignosulfonate water reducing agent and 5kg of aluminum sulfate into the premix while stirring, and uniformly stirring to form an intermediate mixture.

And (3) adding the residual 85kg of water into the intermediate mixture, and uniformly stirring to obtain the concrete mixture.

And (4) pouring the concrete mixture into a template, controlling the curing temperature to be 35 ℃ and the humidity to be 97%, curing and forming to obtain the high-permeability concrete using the recycled aggregate.

Example 2

The difference from example 1 is that:

the high-permeability concrete using the recycled aggregate comprises the following components in parts by mass:

138kg of cement; 160kg of water; 840kg of sand with the grain diameter of 0.35-0.5 mm; 125kg of crushed stone with the particle size of 5-16 mm; 870kg of crushed stone with the grain diameter of 16-25 mm; 180kg of incineration slag; 3kg of calcium lignosulphonate water reducing agent; 3kg of aluminum sulfate.

Example 3

The difference from example 1 is that:

the high-permeability concrete using the recycled aggregate comprises the following components in parts by mass:

143kg of cement; 165kg of water; 820kg of sand with the grain diameter of 0.35-0.5 mm; 130kg of crushed stone with the particle size of 5-16 mm; 875kg of crushed stones with the particle size of 16-25 mm; 170kg of incineration slag; 4kg of calcium lignosulfonate water reducing agent; 4kg of aluminum sulfate.

Example 4

The difference from example 1 is that: the equivalent polycarboxylic acid water reducing agent is used for replacing the calcium lignosulphonate water reducing agent.

Example 5

The difference from example 1 is that: in the step (1), 2kg of kaolin is also added.

Example 6

The difference from example 1 is that: in the step (1), 2kg of syrup is also added.

Example 7

The difference from example 1 is that: 1kg of kaolin and 1kg of syrup are also added in the step (1).

Example 8

The difference from example 1 is that: in the step (1), 2kg of kaolin and 0.3kg of syrup are also added.

Example 9

The difference from example 1 is that: equal amounts of silica were substituted for aluminum sulfate.

Example 10

The difference from example 1 is that: the admixture is formed by uniformly mixing borax and ferric pyrophosphate according to the mass ratio of 2.

Example 11

The difference from example 1 is that: the additive is prepared by uniformly mixing borax and ferric pyrophosphate according to the mass ratio of 2.

Example 12

The difference from example 1 is that: the admixture is formed by uniformly mixing borax and silicon dioxide according to the mass ratio of 2.

Example 13

The difference from example 1 is that: the additive is prepared by uniformly mixing silicon dioxide and ferric pyrophosphate according to the mass ratio of 2.

Example 14

The difference from example 1 is that: the additive is prepared by mixing silane impregnant and aluminum sulfate in a proportion of 1:4, and the components are uniformly mixed according to the mass ratio.

Example 15

The difference from example 1 is that: the additive is prepared by uniformly mixing a silane impregnant and aluminum sulfate in a mass ratio of 1.

Example 16

The difference from example 1 is that: the additive is prepared by uniformly mixing a silane impregnant and aluminum sulfate in a mass ratio of 1.

Example 17

The difference from example 1 is that:

the high-permeability concrete using the recycled aggregate comprises the following components in parts by mass:

140kg of cement; 165kg of water; 835kg of sand with the grain diameter of 0.35-0.5 mm; 127kg of crushed stone with the particle size of 5-16 mm; 878kg of macadam with the particle size of 16-25 mm; 173kg of incinerator slag; 3.5kg of polycarboxylic acid; 4.5kg of additive; 1.5kg of kaolin; 0.5kg syrup;

the additive is prepared by uniformly mixing a silane impregnant and a reinforcing agent according to the mass ratio of 1.

Comparative example 1

The difference from example 1 is that: replacing the sand with the grain diameter of 0.35-0.5mm with the equivalent sand with the grain diameter of 0.1-0.35 mm.

Comparative example 2

The difference from example 1 is that: the same amount of crushed stones with the grain diameter of 1-5mm is used for replacing crushed stones with the grain diameter of 5-16 mm.

Comparative example 3

The difference from example 1 is that: replacing crushed stone with the particle size of 16-25mm with the same amount of crushed stone with the particle size of 25-30 mm.

Experiment 1

The 28d compressive strength (MPa) of the high-permeability concrete prepared by the above examples and comparative examples and using the recycled aggregate is detected according to the 6. Compressive strength test in GB/T50081-2002 Standard test method for mechanical Properties of ordinary concrete.

Experiment 2

The water permeability coefficient (mm/s) of the high permeable concrete using recycled aggregate prepared in the above examples and comparative examples was measured according to GB/T25993-2010 Standard permeable Cement concrete Water permeability coefficient test apparatus Specification.

The data of the above experiment are shown in Table 2

TABLE 2 Experimental survey data

According to the comparison of the data of the example 1 and the comparative examples 1 to 3 in the table 2, only if the aggregates with specific particle sizes in specific proportions are adopted to cooperate with each other, the concrete can form a firm porous permeable structure better, the concrete can maintain the strength performance and the water permeability performance better, and the strength of the concrete is not influenced by the incineration slag easily.

According to the comparison of the data of the example 1 and the example 4 in the table 2, the polycarboxylic acid water reducing agent is adopted, so that the compatibility of the incineration slag and other substances is improved, and the compression strength of the concrete is higher.

From the comparison of the data of example 1 and examples 5 to 8 in Table 2, it can be seen that the addition of kaolin alone or syrup alone has little effect on the compressive strength of concrete, and that the compatibility of the incineration slag with other components can be improved to make the compressive strength of concrete higher only when kaolin and syrup are added to the concrete at the same time.

According to the comparison of the data of the embodiment 1 and the embodiments 9 to 13 in the table 2, the borax and the ferric pyrophosphate with specific proportions are adopted for synergistic compounding, so that the compressive strength of the concrete can be better improved, the water permeability of the concrete is not easily influenced, and the strength performance and the water permeability of the concrete can be better balanced.

According to the comparison between the data of example 1 and examples 14-16 in table 2, the mass ratio of the silane impregnant to the reinforcing agent is controlled, so that the interaction between the silane impregnant and the reinforcing agent is promoted better, and the corrosion resistance and the compressive strength of the concrete are better.

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 (7)

1. The utility model provides an application high permeable concrete of recycled aggregate which characterized in that: the paint comprises the following components in parts by mass:

133-143 parts of cement;

160-170 parts of water;

820-840 parts of sand with the particle size of 0.35-0.5 mm;

120-130 parts of crushed stone with the particle size of 5-16 mm;

870-880 parts of crushed stone with the particle size of 16-25 mm;

170-180 parts of incineration slag;

2-4 parts of a water reducing agent;

3-5 parts of an additive;

the admixture at least comprises a reinforcing agent;

the reinforcing agent is prepared by uniformly mixing borax and ferric pyrophosphate in a mass ratio of 2 (3-6).

2. The high-permeability concrete using recycled aggregate as claimed in claim 1, wherein: the water reducing agent is a polycarboxylic acid water reducing agent.

3. The high-permeability concrete using recycled aggregate as claimed in claim 1, wherein the concrete comprises: the paint also comprises the following components in parts by mass:

1-2 parts of kaolin;

0.3-1 part of syrup.

4. The high-permeability concrete using recycled aggregate as claimed in claim 1, wherein: the admixture further comprises a silane impregnant.

5. The high-permeability concrete using recycled aggregate as claimed in claim 4, wherein the concrete comprises: the mass ratio of the silane impregnant to the reinforcing agent is 1: (1-3).

6. A method for preparing the highly permeable concrete using recycled aggregate according to any one of claims 1 to 2, wherein: the method comprises the following steps:

step (1), mixing cement, sand with the grain size of 0.5-0.35mm, broken stone with the grain size of 5-16mm, broken stone with the grain size of 16-25mm, incinerator slag and water with the mass of 1/2, and stirring and mixing uniformly to form a premix;

step (2), adding a water reducing agent and an additive into the premix, and uniformly stirring to form an intermediate mixture;

step (3), adding the residual 1/2 mass of water into the intermediate mixture, and uniformly stirring to obtain a concrete mixture;

and (4) pouring the concrete mixture into a template, and curing and forming to obtain the high-permeability concrete using the recycled aggregate.

7. The method for preparing the high-permeability concrete using the recycled aggregate according to claim 6, wherein the method comprises the following steps: 1-2 parts of kaolin and 0.3-1 part of syrup by mass are also added in the step (1).