CN116589248A - A kind of geopolymer-based permeable concrete material and preparation method - Google Patents

Abstract

The invention belongs to the technical field of sponge urban permeable concrete materials, and discloses a geopolymer-based permeable concrete material and a preparation method thereof. The permeable concrete material comprises a component A and a component B; the component A comprises a composite alkali excitant and chitin; the component B comprises calcined metakaolin, silicate cement, water, a water reducing agent, a silane coupling agent, nano silicon dioxide, a nano titanium dioxide aqueous solution, calcium chloride, silicone-acrylate emulsion and quartz sand. The concrete material has the characteristics of high water permeability, good wear resistance, high early strength, good durability, water purification, alkalinity inhibition, easiness in construction, short curing time, moderate price and the like, and can better meet the performance requirements of the permeable concrete.

Description

A kind of geopolymer-based permeable concrete material and preparation method

technical field

The invention belongs to the technical field of sponge city permeable concrete materials, and more specifically relates to a geopolymer-based permeable concrete material and a preparation method.

Background technique

Modern urban construction has led to an increase in urban heat, and the three-dimensionality of the city has reduced the heat dissipation effect. A large number of impervious and hardened roads such as cement concrete and asphalt concrete have weakened the penetration and evaporation of water, thus causing a series of urban ecological problems, such as the heat island effect and urban waterlogging. wait. In order to improve the urban ecological environment, the concept of sponge city construction came into being. Permeable ground is the key to solving ecological problems, and permeable cement concrete is a pavement material that has been studied in depth. However, the traditional permeable cement concrete is prone to pore blockage during the service process, resulting in a greatly reduced water permeability efficiency. In addition, permeable cement concrete also has disadvantages such as long curing and curing time. Therefore, it is imminent to develop new high-performance permeable concrete materials.

Contents of the invention

The purpose of the present invention is to propose a geopolymer-based permeable concrete material and a preparation method for the deficiencies of the prior art. The concrete material of the present invention has the characteristics of high water permeability, good wear resistance, high early strength, good durability, water purification and alkali suppression, easy construction, short curing time and moderate price, and can better meet the performance of permeable concrete Require.

In order to achieve the above object, the present invention provides a geopolymer-based permeable concrete material on the one hand, and the permeable concrete material includes A component and B component;

The A component includes a compound alkali activator and chitin;

The B component includes calcined metakaolin, Portland cement, water, water reducer, silane coupling agent, nano silicon dioxide, nano titanium dioxide aqueous solution, calcium chloride, silicon acrylic emulsion and quartz sand.

According to the present invention, preferably, the A component includes the following components in parts by weight: 2.5 to 6 parts of a composite base activator and 0.5 to 2.5 parts of chitin;

The B component includes the following components in parts by weight: 4.5-10 parts of calcined metakaolin, 3-6 parts of Portland cement, 4-7 parts of water, 0.05-0.5 parts of water reducer, silane coupling agent 0.4-1.0 parts, 0.5-3 parts of nano silicon dioxide, 0.5-5 parts of nano-titanium dioxide aqueous solution, 0.5-3 parts of calcium chloride, 1.5-5 parts of silicon acrylic emulsion and 60-80 parts of quartz sand.

According to the present invention, preferably, the A component includes the following components in parts by weight: 3-5 parts of composite base activator and 1-2 parts of chitin;

The B component includes the following components in parts by weight: 5-7 parts of calcined metakaolin, 4-6 parts of Portland cement, 4-7 parts of water, 0.1-0.5 parts of water reducer, silane coupling agent 0.5-1.0 parts, 1-2 parts of nano silicon dioxide, 1-5 parts of nano-titanium dioxide aqueous solution, 1-2 parts of calcium chloride, 2-5 parts of silicon acrylic emulsion and 65-75 parts of quartz sand.

According to the present invention, preferably, the composite base activator is a mixture of NaOH and Na ₂ SiO ₃ aqueous solution, the modulus of the composite base activator is 1.1-1.5M, and the aging time of the composite base activator is ≥4h.

According to the present invention, preferably, the solid content of the Na ₂ SiO ₃ aqueous solution is 30-40%.

According to the present invention, preferably, the Portland cement is 32.5 Portland cement and/or 42.5 Portland cement.

According to the present invention, preferably, the silane coupling agent is KH550 and/or KH560.

According to the present invention, preferably, the particle size of the nano silicon dioxide is 95-105 nm.

According to the present invention, preferably, the solid content of the nano-titanium dioxide aqueous solution is 5-15%, and the solid particle diameter is 95-105 nm.

According to the present invention, preferably, the particle size of the quartz sand is 2-4mm.

According to the present invention, preferably, the nano-titanium dioxide aqueous solution is a nano-titanium dioxide aqueous solution prepared by using sodium tripolyphosphate as a dispersant.

According to the present invention, preferably, the ratio of the A component to the B component is (0.1-1):1.

Another aspect of the present invention provides a preparation method of the geopolymer-based permeable concrete material, the preparation method comprising:

S1: Mix and stir the composite base activator and chitin evenly to obtain the A component;

S2: Mix and ball-mill the calcined metakaolin, nano-silica, calcium chloride, Portland cement, and quartz sand to obtain a premix; mix the premix, water, water reducer, nano-titanium dioxide aqueous solution, The silicone acrylic emulsion and the silane coupling agent are mixed and stirred evenly to obtain the B component;

S3: Mix and stir the A component and the B component evenly to obtain the geopolymer-based permeable concrete material.

According to the present invention, preferably, in step S2:

The equipment for carrying out the mixing ball milling is a planetary ball mill, and the time of the mixing ball milling is 10-20min;

The mixing and stirring time is 1-2min.

The beneficial effects of the technical solution of the present invention are as follows:

1) The geopolymer-based permeable concrete material of the present invention has the characteristics of high water permeability, good wear resistance, high early strength, good durability, water purification and alkali suppression, easy construction, short curing time and moderate price, etc., and can Better meet the performance requirements of permeable concrete.

2) The preparation method of the geopolymer water-permeable pavement material of the present invention is simple and easy to popularize.

Other features and advantages of the present invention will be described in detail in the detailed description that follows.

Detailed ways

Preferred embodiments of the present invention will be described in more detail below. Although preferred embodiments of the present invention are described below, it should be understood that the present invention can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

In each of the following examples:

The composite base activator is a mixture of NaOH and Na ₂ SiO ₃ aqueous solution (solid content is 35%), the modulus of the composite base activator is 1.2M, and the aging time of the composite base activator is ≥ 4h ;

Described Portland cement is 32.5 Portland cement;

The silane coupling agent is KH550;

The particle size of the nano silicon dioxide is 95-105nm;

The nano-titanium dioxide aqueous solution is a nano-titanium dioxide aqueous solution prepared by using sodium tripolyphosphate as a dispersant, the solid content of the nano-titanium dioxide aqueous solution is 10%, and the solid particle size is 95-105 nm;

The particle size of the quartz sand is 2-4mm.

Example 1

This embodiment provides a geopolymer-based permeable concrete material, which includes A component and B component;

The A component includes the following components in parts by weight: 3 parts of a composite base activator and 2 parts of chitin;

The B component includes the following components in parts by weight: 5 parts of calcined metakaolin, 4 parts of Portland cement, 4 parts of water, 0.1 part of water reducing agent, 0.5 part of silane coupling agent, 1 part of nano silicon dioxide 1 part, 1 part of nano-titanium dioxide aqueous solution, 2 parts of calcium chloride, 2 parts of silicon acrylic emulsion and 65 parts of quartz sand.

The preparation method of above-mentioned geopolymer-based permeable concrete material comprises:

S1: Mix and stir the composite base activator and chitin evenly to obtain the A component;

S2: Grinding the calcined metakaolin, nano silicon dioxide, calcium chloride, Portland cement, and quartz sand in a planetary ball mill for 15 minutes to obtain a premix;

In a concrete mixer, mix and stir the premix, water, water reducer, nano-titanium dioxide aqueous solution, silicon acrylic emulsion and silane coupling agent for 1-2 minutes to obtain the B component;

S2: Mix and stir the A component and the B component evenly, pour, vibrate, and maintain for 28 days under standard conditions (that is, the temperature is (20±2)°C, and the relative humidity is above (95%)) That is, the geopolymer-based permeable concrete pavement material is obtained.

Example 2-6

Embodiments 2-6 respectively provide a geopolymer-based permeable concrete material. The difference between Embodiments 2-6 and Embodiment 1 is that the dosage of each component is different. See Table 1 for details.

Table 1

test case 1

In this test example, the geopolymer-based permeable concrete material in Examples 1-6 is tested for performance, wherein the porosity test method refers to "Technical Regulations for Permeable Concrete Pavement (Beijing)"(DB11AT775-2010); the mechanical performance test method refers to "Standards for Test Methods of Mechanical Properties of Ordinary Concrete"(GBT50081-2002); the water permeability coefficient is measured and calculated based on Darcy's law, and the maximum adsorption capacity of Pb ²⁺ refers to the "Solid Waste Leaching Toxicity Leaching Method Acetic Acid Buffer Solution Method" (HJ/T300—2007) Perform measurement calculations. The test results are shown in Table 2.

Table 2

Having described various embodiments of the present invention, the foregoing description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and alterations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims (10)

1. A geopolymer-based permeable concrete material, characterized in that the permeable concrete material comprises an a-component and a B-component;

the component A comprises a composite alkali excitant and chitin;

the component B comprises calcined metakaolin, silicate cement, water, a water reducing agent, a silane coupling agent, nano silicon dioxide, a nano titanium dioxide aqueous solution, calcium chloride, silicone-acrylate emulsion and quartz sand.

2. The geopolymer-based water permeable concrete material according to claim 1, wherein,

the component A comprises the following components in parts by weight: 2.5 to 6 parts of compound alkali excitant and 0.5 to 2.5 parts of chitin;

the component B comprises the following components in parts by weight: 4.5 to 10 parts of calcined metakaolin, 3 to 6 parts of Portland cement, 4 to 7 parts of water, 0.05 to 0.5 part of water reducer, 0.4 to 1.0 part of silane coupling agent, 0.5 to 3 parts of nano silicon dioxide, 0.5 to 5 parts of nano titanium dioxide aqueous solution, 0.5 to 3 parts of calcium chloride, 1.5 to 5 parts of silicone-acrylate emulsion and 60 to 80 parts of quartz sand.

3. The geopolymer-based water permeable concrete material according to claim 2, wherein,

the component A comprises the following components in parts by weight: 3-5 parts of compound alkali excitant and 1-2 parts of chitin;

the component B comprises the following components in parts by weight: 5 to 7 parts of calcined metakaolin, 4 to 6 parts of Portland cement, 4 to 7 parts of water, 0.1 to 0.5 part of water reducer, 0.5 to 1.0 part of silane coupling agent, 1 to 2 parts of nano silicon dioxide, 1 to 5 parts of nano titanium dioxide aqueous solution, 1 to 2 parts of calcium chloride, 2 to 5 parts of silicone-acrylate emulsion and 65 to 75 parts of quartz sand.

4. According to claim 1-3, wherein the composite alkali-activator is NaOH and Na ₂ SiO ₃ The modulus of the composite alkali-activator is 1.1-1.5M, and the ageing time of the composite alkali-activator is more than or equal to 4 hours.

5. The geopolymer-based water permeable concrete material of claim 4, wherein said Na ₂ SiO ₃ The solid content of the aqueous solution is 30-40%.

6. The geopolymer-based water permeable concrete material according to any one of claims 1 to 3, wherein,

the silicate cement is 32.5 silicate cement and/or 42.5 silicate cement;

the silane coupling agent is KH550 and/or KH560;

the particle size of the nano silicon dioxide is 95-105 nm;

the solid content of the nano titanium dioxide aqueous solution is 5-15%, and the solid particle size is 95-105 nm;

the particle size of the quartz sand is 2-4 mm.

7. The geopolymer-based permeable concrete material according to claim 6, wherein the aqueous nano-titania solution is an aqueous nano-titania solution prepared by using sodium tripolyphosphate as a dispersant.

8. A geopolymer-based water permeable concrete material according to any one of claims 1 to 3, wherein the ratio of the a and B components is (0.1 to 1): 1.

9. a method for preparing a geopolymer-based water permeable concrete material according to any one of claims 1 to 8, wherein the preparation method comprises:

s1: mixing and stirring the composite alkali excitant and chitin uniformly to obtain the component A;

s2: mixing and ball milling the calcined metakaolin, nano silicon dioxide, calcium chloride, silicate cement and quartz sand to obtain a premix; uniformly mixing and stirring the premix, water, a water reducer, a nano titanium dioxide aqueous solution, silicone-acrylate emulsion and a silane coupling agent to obtain a component B;

s3: and mixing and stirring the component A and the component B uniformly to obtain the geopolymer-based permeable concrete material.

10. The method for preparing a geopolymer-based permeable concrete material according to claim 9, wherein, in step S2:

the equipment for carrying out the mixing ball milling is a planetary ball mill, and the time of the mixing ball milling is 10-20min;

the mixing and stirring are carried out for 1-2min.