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Low-temperature early strong bridge support anchoring material and preparation method thereof

A bridge bearing and early-strength technology, which is used in the field of low-temperature early-strength bridge bearing anchoring material and expansion early-strength bearing grouting material, can solve the problems affecting load transfer and engineering quality, large volume deformation of grouting material, resistance to resistance. Low compressive strength ratio, etc., to achieve the effect of enhancing volume stability, good filling degree and high compressive strength

Inactive Publication Date: 2013-03-20
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN 102173676A discloses a non-shrinkage cement grouting material, which is characterized by early strength, high strength, micro-expansion, and shortened construction period. To reach more than 20MPa
[0004] When the temperature is between 5°C and minus 15°C, the strength of traditional grouting and anchoring materials grows slowly, and shrinkage occurs, resulting in a decrease in strength in the later stage. Dense, affecting load transfer and engineering quality
In the process of laying prefabricated box girders for high-speed railways, it is required that the supports can bear the load of continuous girders after 2 hours of grouting. Under these conditions, no special measures have been taken to achieve bridge grouting and anchoring materials with a strength of 20MPa within 2 hours.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] According to the above scheme, the reinforcing agent is calcium formate.

Embodiment 2

Embodiment 3

[0018] When in use, add 13% to 16% water to the low-temperature early-strength bridge support anchoring material prepared by the present invention by weight, and use a mechanical mixer to stir at a slow speed for 2 minutes, and then stir quickly for 2 minutes to make the slurry even, that is, Anchor grouting is available.

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Abstract

The invention relates to a low-temperature early strong bridge support anchoring material which is prepared from the following components in percentage by weight: 38-45 percent of aluminum sulfate cement, 2-6 percent of expanding agent, 1-5 percent of superfine silica fume, 40-50 percent of quartz sand, 0.5-0.8 percent of water reducing agent, 0.5-1 percent of reinforcing agent, 0.1-0.4 percent of thickening time control agent, 0.02-0.06 percent of defoaming agent, 2-5 percent of anti-freezing agent and 0.04-0.08 percent of fluid volume stabilizing agent. All the components are uniformly mixed, mixed with water and stirred, wherein the ratio of material to water is 0.13-0.16; and after being uniformly stirred, the mixture is used for support grouting anchoring. The low-temperature early strong bridge support anchoring material is suitable for rapid construction of bridge support anchoring under the low-temperature condition, and has the characteristics of high fluidity, super easy strong high strength, no shrinkage, good anti-freezing effect and the like.

Description

technical field [0001] The invention relates to a low-temperature early-strength bridge support anchoring material, in particular to an expansion early-strength type for installing high-speed railway and expressway bridge supports under the condition that the temperature is lower than 5°C and higher than minus 15°C. A support grouting material belongs to the technical field of cement-based grouting materials. Background technique [0002] In recent years, the infrastructure is in a period of high-speed construction, especially the high-speed railway passenger dedicated line, expressway and urban light rail are developing rapidly. Therefore, while ensuring the quality of the project, higher requirements are put forward for the construction speed and the improvement of the service life of the infrastructure project. Require. In order to complete the project construction on time or in advance, higher requirements are put forward for the materials used in the infrastructure. Th...

Claims

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Application Information

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IPC IPC(8): C04B28/06
Inventor 马保国朱艳超李海南胡迪韩磊谭洪波
Owner WUHAN UNIV OF TECH
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