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A high-permeability micro-expansion type semi-rigid base curing agent and its preparation method

A semi-rigid base and micro-expansion technology, which is applied in the field of semi-rigid base curing agent, high-permeability micro-expansion semi-rigid base curing agent and its preparation, can solve the problem of uncontrollable internal cracks, stable development of strength, homogeneity of semi-rigid base In order to achieve the effects of good film formation and water retention, stable development of strength in the later stage, and prevention of water evaporation loss

Inactive Publication Date: 2017-04-26
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the maintenance methods for semi-rigid bases in my country mainly include laying wet sacks, laying moisturizing films and sprinkling water, etc., but these methods are time-consuming and labor-intensive, the maintenance is not thorough, the homogeneity of semi-rigid bases cannot be guaranteed, and maintenance is easily delayed Timing, cannot control the development of internal cracks and ensure the stable development of later strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a high-permeability micro-expansion type semi-rigid base curing agent, which consists of the following raw materials in terms of weight fraction: 0.2% polyacrylamide, 25% rice husk ash, 6% hydrotalcite-like, 3% water-based Swelling agent, 1% penetrating agent, 5% sodium methyl siliconate, 1% nano calcium carbonate, 3% ethyl acetate, 3% polysiloxane, and the balance is 52.8% water. The penetrating agent is fatty alcohol polyoxyethylene ether.

[0038] The preparation method of the above-mentioned highly permeable micro-expansion type semi-rigid base curing agent comprises the following steps:

[0039] Step 1, taking the above-mentioned raw materials by mass;

[0040] Step 2, mix nano-calcium carbonate, sodium methyl siliconate and penetrating agent in a beaker, and stir evenly with a glass rod to obtain mixture A; stir and mix polyacrylamide and 50% of the water in the formula in a beaker to obtain Mixture B; miscible polysiloxane and ethyl ace...

Embodiment 2

[0048] This example provides a high-permeability micro-expansion type semi-rigid base curing agent, which consists of the following raw materials in terms of weight fraction: 0.8% polyacrylamide, 17% rice husk ash, 8% hydrotalcite-like, 2% water-based expansion agent, 1.5% penetrant, 2% sodium methyl siliconate, 4% nano calcium carbonate, 5% ethyl acetate, 1.5% polysiloxane, and the balance is 58.2% water. The penetrating agent is fatty alcohol polyoxyethylene ether.

[0049] The preparation method of the curing agent of this embodiment is the same as the steps of Example 1.

[0050] The effective water retention rate and semi-rigid Unconfined compressive strength test of base. Among them, the spraying (smearing) amount of curing agent is 200g / m 2 . After testing, the water retention rate of the curing agent is 92%, the 7d unconfined compressive strength of the semi-rigid base is 110% of the reference strength, and the 28d unconfined compressive strength is 119% of the ref...

Embodiment 3

[0052] This example provides a high-permeability micro-expansion type semi-rigid base curing agent, which consists of the following raw materials in terms of weight fraction: 0.5% polyacrylamide, 20% rice husk ash, 7% hydrotalcite-like, 2.5% water-based swelling agent, 1.3% penetrant, 3% sodium methyl siliconate, 2% nano calcium carbonate, 4% ethyl acetate, 2.5% polysiloxane, and the balance is 57.2% water. The penetrating agent is fatty alcohol polyoxyethylene ether.

[0053] The preparation method of the curing agent of this embodiment is the same as the steps of Example 1.

[0054] The effective water retention rate and semi-rigid Unconfined compressive strength test of base. Among them, the spraying (smearing) amount of curing agent is 200g / m 2 . After testing, the water retention rate of the curing agent is 96%, the 7d unconfined compressive strength of the semi-rigid base is 115% of the reference strength, and the 28d unconfined compressive strength is 127% of the re...

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Abstract

The invention provides a high-permeability and micro-expansibility type curing agent for a semi-rigid base and a preparation method of the curing agent. The curing agent is prepared from polyacrylamide, rice hull ash, a hydrotalcite-like compound, a water-based expanding agent, a permeating agent, sodium salt of methylsiloxanols, nano-calcium carbonate, ethyl acetate, polysiloxane and water. The high-permeability and micro-expansibility type curing agent for the semi-rigid base has the advantages of high permeability and micro expansibility, high early strength, a good film forming and water holding effect and the like. The curing agent has the film forming effect and can prevent evaporation loss of water in the semi-rigid base, control and reduce dry shrinkage of the base and guarantee full hydration of a semi-rigid base material; as the curing agent contains an expanding component, a permeating component, an early strength component and other raw materials, the curing agent can also be used for filling pores and tiny holes of the semi-rigid base, accelerate a pozzolanic reaction, improve the compactness and anti-penetrability performance of the semi-rigid base and greatly improve the early strength.

Description

technical field [0001] The invention belongs to the field of road materials and relates to a semi-rigid base curing agent, in particular to a highly permeable micro-expansion semi-rigid base curing agent and a preparation method thereof. Background technique [0002] Since the 1980s, semi-rigid base materials have been widely used in high-grade highway construction due to their good board properties, high bearing capacity, excellent fatigue resistance and economy. At present, about 90% of the bases of my country's high-grade highways use semi-rigid base materials. However, with the promotion of semi-rigid base materials nationwide, more and more problems have been exposed during use. Among them, the cracking problem of the semi-rigid base pavement is particularly serious, which greatly affects the driving comfort of the asphalt pavement and shortens the service life of the asphalt pavement. The main defect of the semi-rigid base pavement structure is that it shrinks signif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42
CPCC04B40/0039C04B40/0046C04B24/2652C04B18/101C04B14/36C04B14/104C04B24/32C04B24/42C04B14/28C04B24/045
Inventor 周娟兰何锐李祖仲郑睢宁黄鑫姬楠楠陈华鑫
Owner CHANGAN UNIV
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