Additive for decreasing shrinkage rate of synchronous grouting materials

A technology of simultaneous grouting and shrinkage rate, applied in mining equipment, tunnels, earthwork drilling, etc., can solve the problems of weakened control ability of formation subsidence and obvious surface subsidence, so as to improve the shrinkage problem and reduce the shrinkage rate.

Inactive Publication Date: 2017-02-22
CHINA UNIV OF MINING & TECH (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology helps reduce shrinking rates when injected with cement during construction projects by introducing certain substances that help protect it from water damage or other factors like temperature changes. These improvements improve the quality control over concrete structures made through this process.

Problems solved by technology

This patented technical solution described in this patents relates to improving the filling properties of hydraulic material systems like concrete while reducing their shrinking due to water absorption from pores within them.

Method used

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  • Additive for decreasing shrinkage rate of synchronous grouting materials

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Embodiment Construction

[0013] In a broad embodiment of the present invention: the present invention provides a kind of additive that reduces the shrinkage rate of synchronous grouting material, and the additive that described reduction synchronous grouting material shrinkage comprises: industrial alum and industrial gypsum, described synchronous grouting material reduction The amount of additives for shrinkage rate is 5kg / m 3 .

[0014] Such as figure 1 As shown, the synchronous grouting is shield tail grouting, that is, while the shield is advancing, there is a large shield tail gap at the shield tail after a few rings of the tunnel face, where the shield tail is about to leave the segment, so it is necessary to inject The slurry ensures the stability of the formation.

[0015] In actual construction, if the synchronous grouting slurry shrinks greatly, it may cause the land subsidence to exceed the requirements in some risk source areas, so it is necessary to reduce the shrinkage of the grout.

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Abstract

The invention discloses an additive for decreasing the shrinkage rate of synchronous grouting materials. The additive for decreasing the shrinkage rate of the synchronous grouting materials comprises industrial potash alum and industrial gypsum. The mixing amount of the additive for decreasing the shrinkage rate of the synchronous grouting materials is 5 kg/m<3>, and by adding the additive for decreasing the shrinkage rate of the synchronous grouting materials into shield synchronous grout, shrinkage of the existing synchronous grout materials in a waterless stratum can be remarkably relieved.

Description

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Claims

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Application Information

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Owner CHINA UNIV OF MINING & TECH (BEIJING)
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