Preparation method of geopolymer road grouting material

Abstract

The invention discloses a preparation method of a geopolymer road grouting material. The geopolymer road grouting material comprises the following raw materials: 18%-25% of silica fume, 12%-20% of an exciting agent, 12%-20% of cement clinker, 4%-8% of fly ash floating beads, 0.5%-1.5% of polyacrylamide, 2%-5% of an emulsion A, 1%-2% of an emulsion B, 24.5%-42.5% of water and 3%-8% of others. The preparation method comprises the following steps: preparing a modified emulsion C from an organic emulsion A, an emulsion B and deionized water; then the emulsion C is adopted to modify the geopolymer, and the silica fume-based geopolymer grouting material with the low water-solid ratio is prepared through staged stirring and can be applied to drilling grouting during concrete pavement repair or reinforcement. The invention provides the preparation method of the geopolymer road grouting material for the first time, expands the technical method library of pavement repair, and invents the preparation method of the grouting material for quickly repairing the damaged concrete pavement at low cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of composite materials, and relates to a preparation method of a geopolymer road grouting material. BACKGROUND

[0002] In recent years, with the rapid development of urbanization and infrastructure construction, considering the sharp increase of traffic load, traffic volume and speed, the permanent deformation of flexible pavement has become very common. The semi-flexible and high-filled geopolymer road grouting material is a reliable and widely used jointless paving material, which is easy to construct and maintain, and can provide driving quality and satisfactory service performance.

[0003] The semi-flexible pavement is a composite material composed of a certain graded asphalt mixture, and 20% to 35% of the voids are filled with a special cement slurry. Due to the interface between different components in the asphalt mixture, the weak interface of the semi-flexible pavement is prone to form cracks, pits and grooves under the action of environmental aging with the increase of service time, which seriously affects the traffic capacity of the pavement. The use of geopolymer road grouting material can effectively repair and realize low-cost and rapid repair of damaged pavement.

[0004] The design of the geopolymer road grouting material in the present application is different from the traditional cement grouting material, which opens up a resource utilization way for high-value utilization of industrial solid wastes such as fly ash and silica fume. The cement grouting material often has problems such as insufficient fluidity, which leads to insufficient filling of the grouting to the voids of the microcrack homogenization concrete pavement, and lower durability and strength of the pavement. The fluidity of the slurry can be improved by adjusting the water-cement ratio of the grouting material and adding high-efficiency water reducing agent. Due to the lack of preparation method of semi-flexible and high-filled (low porosity) concrete road grouting material, there is no report on high-filled silica fume-based geopolymer concrete road grouting material at present. After consulting relevant patents and documents, no method for preparing semi-flexible and high-filled silica fume-based geopolymer grouting material has been found. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application proposes a preparation method of a geopolymer road grouting material, which fills the gap in the preparation of semi-flexible and high-filled silica fume-based geopolymer road grouting material.

[0006] To solve the above problems, the technical scheme adopted by the present application is: A preparation method of a geopolymer road grouting material, which is composed of the following raw materials: Silica fume 18% to 25% Activator 12% to 20% Cement clinker 12% to 20% Fly ash floating beads 4% to 8% Polyacrylamide 0.5% to 1.5% Emulsion A 2%~5 % Emulsion B 1%~2 % Water 24.5%~42.5% Others 3%~8% The sum of the mass percentages of the raw materials is 100%. Comprising the following steps: Step one, select a certain in-service concrete pavement in Xi'an, make construction preparation, micro-crack homogenization is carried out on the pavement, hole arrangement and drilling treatment are carried out; Step two, organic emulsion A, emulsion B and deionized water are configured to prepare modified emulsion C; Step three, the emulsion C is sprayed into the drilling hole of step one by using a spray gun; Step four, a low water-solid ratio of silica fume based geopolymer grouting material is prepared by using emulsion C modified geopolymer and stage stirring, and the raw material composition comprises: 18%~25% silica fume, 12%~20% activator, 12%~20% cement clinker, 4%~8% fly ash floating bead, 0.5%~1.5% polyacrylamide, 2%~5% emulsion A, 1%~2% emulsion B, 24.5%~42.5% water and 3%~8% others.

[0007] Step five, the geopolymer road grouting material of step four is grouted in the drilling hole of step three to obtain a sample; The step one selects a certain actual in-service concrete pavement in Xi'an for experiment.

[0008] The organic emulsion A and emulsion B of the step two are purchased on the market.

[0009] The step three sprays the emulsion C twice by using a spray gun, and each time interval is 10 minutes.

[0010] The step four refers to the "Highway Engineering Cement and Cement Concrete Test Regulations" (JTG E30-2005).

[0011] The fluidity is tested by using a fluidity instrument, and the flow performance is evaluated according to the fluidity.

[0012] The high filling property is determined according to the porosity, and is calculated according to formulas (1)~(2).

[0013] (1) The present application provides a preparation method of a high filling rate, two-component organic modified silica fume based geopolymer road grouting material. Compared with common cement based grouting material, the preparation method has the characteristics of excellent work performance, high filling rate and simple process.

[0014] (2) The method of the present application solves the problems of low flowability of road grouting material, low crack permeability and filling degree, and low bonding strength, and improves the comprehensive performance of the road grouting material.

[0015] (3) The method of the present application prepares a concrete road grouting material with simple construction, low cost, and excellent durability.

[0016] (4) The method has wide applicability, has the flexibility of asphalt pavement and the high strength of concrete pavement, and can be used for pavement and maintenance of highways, expressways, bridge pavement, tunnels, industrial areas, etc.

[0017] In order to make the purpose and advantages of the present application clearer and more apparent, the present application will be further described in detail below in conjunction with examples. The specific examples described herein are only used to explain the present application and do not limit the present application. DETAILED DESCRIPTION

[0018] The method of the present application prepares a semi-flexible and high-filling silica ash geopolymer grouting material by modifying the organic emulsion geopolymer mortar and then forming and demolding, which improves the setting speed of the road grouting material, shortens the construction time of the maintenance and maintenance pavement engineering, enhances the driving quality and safety of the pavement, and provides a grouting material for quickly repairing damaged concrete pavement. EXAMPLE

[0019] A preparation method of a geopolymer road grouting material, specific formula and steps are as follows: Silica ash 20 wt% Activator 15 wt% Cement clinker 13 wt% Fly ash floating bead 5 wt% Polyacrylamide 1 wt% Emulsion A 3.5 wt% Emulsion B 1.5 wt% Water 36 wt% Others 5 wt% The sum of the mass percentages of the raw materials is 100 wt%; Step one, select a certain in-service concrete pavement in Xi'an, prepare for construction, and perform micro-crack homogenization, hole arrangement and drilling treatment on the pavement; Step two, proportionally configure the organic emulsion A, emulsion B and deionized water, and prepare a modified emulsion C by stage stirring; Step three, use an airbrush to spray the emulsion C twice, with an interval of 10 minutes each time, and spray it into the drill holes of step one; Step four, the modified geopolymer is prepared by adding emulsion C, 52.5% geopolymer sand, water-cement ratio of 0.37, 1.5% calcium chloride, 0.2% water reducing agent into the stirring tank and stirring well, the raw material composition of the low water-solid ratio silica fume geopolymer grouting material includes: 18%~25% silica fume, 12%~20% activator, 12%~20% cement clinker, 4%~8% fly ash floating bead, 0.5%~1.5% polyacrylamide, 2%~5% emulsion A, 1%~2% emulsion B, 24.5%~42.5% water and 3%~8% other.

[0020] Step five, the geopolymer road grouting material of step four is grouted in the drill hole of step three, and a geopolymer road grouting material is obtained. The fluidity and porosity test results of the tested geopolymer road grouting material are shown in Table 1 (Example 1). Example

[0021] A preparation method of a geopolymer road grouting material, the specific steps are as follows: Steps one to five, the geopolymer mortar has a water-cement ratio of 0.40, and the rest is the same as Example 1.

[0022] The fluidity and porosity test results of the tested geopolymer road grouting material are shown in Table 1 (Example 2). Example

[0023] A preparation method of a geopolymer road grouting material, the specific method is as follows: Steps one to five, the geopolymer mortar has a water-cement ratio of 0.43, and the rest is the same as Example 1.

[0024] The fluidity and porosity test results of the tested geopolymer road grouting material are shown in Table 1 (Example 3).

[0025] Table 1 Fluidity and porosity test results of geopolymer road grouting material

[0026] As can be seen from Table 1, a semi-flexible and high-filled concrete road grouting material can be successfully prepared by the method, which meets the requirements of conventional semi-flexible concrete grouting material and has good fluidity. With the continuous increase of water-cement ratio, the fluidity of the example is continuously improved.

[0027] The preparation method of a conventional semi-flexible and high-filled concrete pavement road grouting material is given in the present comparative example, which is different from Example 1 in that: in steps two to four, the microcrack homogenized concrete pavement road is not brushed with an organic emulsion, and the grouting material is not prepared with an organic emulsion, as shown in Table 2 (Note that in Table 2, Comparative Examples 1, 2 and 3 correspond to road grouting material samples with water-cement ratios of 0.37, 0.40 and 0.43, respectively, and the others are the same).

[0028] Table 2: Flowability and porosity test results of geopolymer road grouting material

[0029] It is found from the results of the examples and comparative examples that, compared with the modified samples, the samples that are not treated with organic emulsion modification have poorer flowability, greater density and greater porosity. The organic emulsion modified samples in the examples have the characteristics of high flowability, high filling rate (low porosity), low cost, etc., and Comparative Example 3 (high water-cement ratio) cannot achieve the sample bonding in the examples.

Claims

1. A method for the production of a geopolymer road grouting material, characterized in that, The following raw materials are included in mass percentage: Silica ash 18%~25% Activator 12%~20% Cement clinker 12%~20% Fly ash floating bead 4%~8% Polyacrylamide 0.5%~1.5% Emulsion A 2%~5% Emulsion B 1%~2% Water 24.5%~42.5% Others 3%~8% The sum of the mass percentages of the raw materials is 100%; Step one, select a concrete pavement in service for three years in Xi'an, carry out construction preparation, and perform micro-crack homogenization, hole distribution and drilling treatment on the pavement; Step two, prepare modified emulsion C by configuring organic emulsion A, emulsion B and deionized water; Step three, spray emulsion C into the drilling hole of step one by using a spray gun; Step four, prepare low water-solid ratio silica ash geopolymer grouting material by fully mixing the raw materials in a mixer after modifying the geopolymer with emulsion C; Step five, inject the geopolymer grouting material of step four into the drilling hole of step three to obtain a sample.

2. The method of claim 1, wherein, The organic emulsion A, emulsion B and deionized water of step two are purchased on the market.

3. The method of claim 1, wherein, The spray gun is used to spray emulsion C twice with an interval of 10 minutes between each spraying in step three.

4. The method of claim 1, wherein The reference is JTG E30-2005 "Highway Engineering Cement and Cement Concrete Test Regulations" in step four.

5. The method of claim 1, wherein, The flowability is tested by a flowability tester, and the flow performance is evaluated according to the flowability.

6. The method of claim 1, wherein, The high filling property is determined according to the porosity, and is calculated according to formulas (1)~(2);

Images