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Method for improving shrinkage cracking performance of cement-based grouting material

A grouting material, shrinkage cracking technology, used in analytical materials, material inspection products, instruments, etc., can solve the problems of low tensile performance and poor cracking resistance.

Pending Publication Date: 2021-09-14
POWERCHINA XIBEI ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the engineering technical problems such as poor early cracking resistance and low tensile performance of cement-based grouting materials, and improve the mechanical properties and durability of cement-based grouting materials to a certain extent, thereby prolonging the service life of structures and buildings

Method used

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  • Method for improving shrinkage cracking performance of cement-based grouting material
  • Method for improving shrinkage cracking performance of cement-based grouting material
  • Method for improving shrinkage cracking performance of cement-based grouting material

Examples

Experimental program
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Embodiment 1

[0037] This embodiment provides a method for improving the shrinkage cracking performance of cement-based grouting materials, comprising the following steps:

[0038] S1, carry out the primary substrate screening test to obtain the primary substrate;

[0039] S2, based on the first-level base material, carry out the screening test of the second-level base material to obtain the second-level base material;

[0040] S3, carry out the fiber reinforcement modification test on the screened secondary base material, and optimize the fiber content to obtain the cement-based grouting dry material;

[0041] S4, adding water with a mass fraction of 9-11% to the cement-based grouting dry material prepared in S3, stirring evenly, and discharging to obtain an improved cement-based grouting material.

[0042] The invention first screens out the cement-based grouting base materials through relevant tests, and then mixes an appropriate amount of expansion agent and an optimized amount of fibe...

Embodiment 2

[0044] This embodiment relates to a method for improving the shrinkage cracking performance of cement-based grouting materials, comprising the following steps:

[0045] S1, performing a first-level base material screening test to obtain a first-level base material, specifically, the first-level base material screening test is a fluidity test and a compressive strength test;

[0046] S2, performing a secondary substrate screening test on the basis of the primary substrate to obtain a secondary substrate; specifically, the secondary substrate screening test is an early shrinkage performance test;

[0047] S3, carry out the fiber reinforcement modification test on the screened secondary base material, optimize the fiber content, and obtain the cement-based grouting dry material;

[0048] S4, adding water with a mass fraction of 9-11% to the cement-based grouting dry material prepared in S3, stirring evenly, and discharging to obtain an improved cement-based grouting material.

...

Embodiment 3

[0059] On the basis of Example 2, the secondary substrate screening test is an early shrinkage performance test, and the expansion agent can improve the early shrinkage performance of the primary substrate. Therefore, the secondary substrate is composed of the primary substrate and a certain amount of expansion agent. Mix composition. Adding an expansion agent accounting for 4% to 10% of the mass of the adhesive material in the primary base material can improve the early shrinkage performance of the primary base material.

[0060] Furthermore, the method for determining the amount of expansion agent is: under the premise of ensuring that the fluidity and compressive strength of the primary base material are satisfied, the expansion agent with an amount of 4% to 10% of the mass of the adhesive material is mixed with the primary base material. Material mixing, compare the effects of different amounts of expansion agent on the early shrinkage performance of the primary base mater...

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Abstract

The invention discloses a method for improving the shrinkage cracking performance of a cement-based grouting material. The method comprises the following steps of: S1, carrying out a primary base material screening test to obtain a primary base material; S2, carrying out a secondary base material screening test on the basis of the primary base material to obtain a secondary base material; S3, performing a fiber-reinforced modification test on the screened secondary base material, and optimizing the fiber mixing amount to obtain a cement-based grouting dry material; and S4, adding 9-11% by mass of water into the cement-based grouting dry material prepared in the step S3, and uniformly stirring to obtain an improved cement-based grouting material. According to the method, firstly, cement-based grouting base materials are screened through related tests, then different mixing amounts of expanding agents and an optimized amount of fibers are added, and therefore the cement-based grouting material meeting the target performance index is obtained. The engineering technical problems that the cement-based grouting material is poor in early-stage cracking resistance, low in tensile property and the like are solved, the mechanical property and durability of the cement-based grouting material are improved, and the service lives of structures and buildings are prolonged.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a method for improving the shrinkage and cracking performance of cement-based grouting materials. Background technique [0002] Alpine and high-altitude areas have harsh natural conditions such as large temperature difference between day and night, severe freeze-thaw cycles, strong solar radiation, and strong corrosion in saline-alkaline areas. In the construction of infrastructure in this region, the durability of concrete structures is a key issue that the engineering community pays more attention to. Surveys have shown that a large number of concrete buildings built in the Qinghai-Tibet Plateau have been damaged to varying degrees in harsh environments, and the speed is accelerating. Especially in the concrete structure projects built in the salt lake area, under the multiple effects of salinity and other factors, the erosion of concrete is aggravated, and the no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/38C04B28/04
CPCG01N33/383C04B28/04C04B2201/50C04B18/146C04B14/06C04B2103/302
Inventor 贺晶晶马凌云卢浩丹狄圣杰樊李浩吴文博
Owner POWERCHINA XIBEI ENG
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