Low-alkaline liquid accelerating agent and preparation method thereof

A liquid accelerator and liquid technology, applied in the field of tunnel construction, can solve problems such as concrete cracking and loss of mechanical properties, and achieve good adaptability, wide applicability, and simple operation

Active Publication Date: 2011-10-19
CHINA RAILWAY TUNNEL GROUP CO LTD
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Problems solved by technology

When the amount of aluminum sulfate is very large, a high content of sulfate will be introduced into the concrete, and when the sulfate content of the concrete is high, the possibility of seconda

Method used

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  • Low-alkaline liquid accelerating agent and preparation method thereof

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preparation example Construction

[0027] The preparation process of low-alkali liquid quick-setting agent of the present invention:

[0028] In conjunction with the mass percent of the components of Example 1 and the proportioning ratio:

[0029] Step 1: Weigh 600 grams of aluminum sulfate powder and 100 grams of sodium aluminate powder, take half of aluminum sulfate, namely 300 grams of water and 240 g of water to prepare aluminum sulfate liquid, and add 100 g of sodium aluminate and 60 g of water to prepare sodium aluminate solution;

[0030] Step 2: Slowly add the sodium aluminate liquid to the aluminum sulfate liquid dropwise. During the dropping process, the dropping speed must be slow and the stirring must be uniform, so as to ensure that the sodium aluminate solution and the aluminum sulfate solution are neutralized to form aluminum hydroxide sol And keep glue melt state;

[0031] The third step: heat up the liquid prepared in the second step to 80°C, add the remaining 300 grams of aluminum sulfate pow...

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Abstract

The invention belongs to the technical field of tunnel construction, and relates to a low-alkaline liquid accelerating agent and a preparation method thereof. For the low-alkaline liquid accelerating agent, aluminium sulfate solution is neutralized with sodium aluminate solution to produce aluminium hydroxide collosol, and then aluminium sulfate and aluminium hydroxide collosol conduct polymerization reaction in an original solution system to produce polymerized aluminium sulfate, so that the accelerating agent solution has higher aluminium ion content and liquid stability; the low-alkaline liquid accelerating agent is prepared by aluminium sulfate, sodium aluminate and stabilizing agent; and the mass percentage of the components are as follows: 40 to 60 percent of aluminium sulfate, 6 to12 percent of sodium aluminate, 0 to 0.2 percent of stabilizing agent, and the balance of water. The invention has the following positive effects to sprayed concrete: initial set of common cement can be realized in five minutes and final set of the common cement can be realized in eight minutes under lower doping amount; the 1d strength of cement mortar can reach more than 12MPa, and the 28d compression strength ratio of the cement mortar is more than 100 percent; and the invention has good adaptability to cement of different varieties.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and relates to a liquid low-alkali quick-setting agent for wet shotcrete, in particular to a low-alkali liquid quick-setting agent used in tunnel wet shotcrete and a preparation method thereof. Background technique [0002] Accelerator is a chemical admixture that can make cement set quickly. Its use can make cement set and harden in a short time. It is mainly used in shotcrete and shotcrete construction. In recent years, due to the advantages of good construction environment, low springback and high construction efficiency, the wet spraying concrete process has gradually replaced the traditional dry spraying process and has been widely used. The quick-setting agent used in conjunction with the construction process is a liquid quick-setting agent. [0003] At present, the commonly used liquid accelerators for wet shotcrete include alkaline liquid accelerators based on sodium silicate...

Claims

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Application Information

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IPC IPC(8): C04B22/14
CPCC04B28/02C04B22/14
Inventor 陈洪光贺雄飞罗小桥洪开荣杨立新李治国王光辉张迅许将程俊武付仲润
Owner CHINA RAILWAY TUNNEL GROUP CO LTD
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