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Slightly expansive cement grouting material

A pouring material and micro-expansion technology, which is applied in the field of micro-expansion cement pouring material, can solve the problem of uncontrollable gas generation at ambient temperature, etc., and achieve the effects of easy control of expansion, improved filling performance, and convenient use

Inactive Publication Date: 2015-01-14
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The use of aluminum powder is a traditional technical method, but because it is greatly affected by the ambient temperature, slurry consistency and alkalinity, it is easy to cause the amount of gas generation to be uncontrollable. Therefore, there are relevant standards in some projects that prohibit the use of this technology. For example, the "Technical Conditions for Grouting of Railway Post-tensioned Prestressed Concrete Beam Pipelines" (TBT 3192-2008) stipulates that the grouting agent used in high-speed rail construction projects must not contain aluminum powder gas-generating materials

Method used

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  • Slightly expansive cement grouting material
  • Slightly expansive cement grouting material
  • Slightly expansive cement grouting material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] According to the ratio of raw materials in Table 1, a series of micro-expansion cement pouring materials can be prepared respectively.

[0018] Table 1 Formula of micro-expansion cement pouring material (mass ratio, unit: part)

[0019]

[0020] The preparation method is that according to the material formula in Table 1, each component is mixed evenly, and the material of this patent series can be obtained.

[0021] Beneficial effect

[0022] Generally, polycarboxylate powder water reducer is used in cement pouring materials to improve fluidity. Using this material, two kinds of micro-expansion cement pouring materials were prepared according to the schemes "2" and "4" in Table 1. , and then according to the mass ratio water: dry material ratio of 0.3, add water and stir to make cement pouring slurry (respectively denoted as GZL-2 and GZL-4), in order to compare the traditional method, aluminum powder and untreated The treated same kind of kelp root powder was us...

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Abstract

The invention relates to a slightly expansive cement grouting material. The slightly expansive cement grouting material consists of early expanding material of the cement grouting material, cement and a cement expansive agent. The early expanding material and the expansive agent are used for respectively offsetting early volume reducing caused by cement paste sedimentation and drying shrinkage and the long-term chemical shrinkage generated by cement continuous hydration, so that the volume stability of the cement grouting material is remarkably improved. The material has no influence to the fluidity of the cement paste, and the early expansion capacity is easily controlled, so that the cost is low, and the preparation is simple, and therefore, the slightly expansive cement grouting material is particularly applicable to engineering which has a big fluidity requirement to the cement grouting material.

Description

technical field [0001] The invention relates to a micro-expansion cement pouring material. Background technique [0002] The application of cement pouring materials in engineering construction is quite common. One of the important requirements for its performance is that it needs to have good filling properties. For many structures such as railway track slabs and bridge support foundations, the pouring materials also require its Has high mobility. Since the cement slurry with high fluidity is prone to settlement and large drying shrinkage, it is usually necessary to add early expansion materials to its materials. The use of aluminum powder is a traditional technical method, but because it is greatly affected by the ambient temperature, slurry consistency and alkalinity, it is easy to cause the amount of gas generation to be uncontrollable. Therefore, there are relevant standards in some projects that prohibit the use of this technology. For example, the "Technical Conditio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B24/38C04B111/70
Inventor 朱洪波李晨闫美珠
Owner TONGJI UNIV
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