Prestressed concrete pipe grouting agent

Abstract

The invention provides a prestressed concrete pipe grouting agent. The grouting agent comprises the following components in parts by weight: 81.3-82.3 parts of cement, 4.0-5.0 parts of silica fume, 0.6-0.7 part of water reducing agent, 11-12 parts of expanding agent, 1.8-2.2 parts of redispersible emulsion powder and the balance of water, wherein the water cement ratio is 0.33-0.35. In the invention, a double-doping system of silica fume and emulsion powder is adopted, thus obviously increasing the strength of the grouting material, obviously cleaning away bleeding, reducing the brittleness coefficient of slurry and increasing the compactness, filling degree and adhesive force of slurry.

Description

technical field [0001] The invention relates to a prestressed concrete pipeline grouting material, in particular to a post-tensioning method prestressed concrete beam pipeline grouting agent. Background technique [0002] Prestressed concrete was urgently needed to heal war wounds after the Second World War. It developed rapidly from Western Europe. So far, it has made great progress in theory, design, materials, technology and engineering applications. my country's prestressed concrete started about 10 years later than Western Europe, but it has developed rapidly and has a large number of applications. Especially in the past 20 to 30 years, my country's prestressed concrete bridges have developed rapidly, regardless of bridge type, span, and construction technology. There have been breakthroughs in technology, and the design and construction technology of many prestressed concrete bridges have reached the international leading level. [0003] However, there is still a laggi...

AI Technical Summary

Problems solved by technology

[0008] However, in the technology of post-tensioned prestressed concrete, when the post-tensioned prestressed steel bars are in the non-horizontal inclined position, multi-span bending state and vertical state, the bleeding of the grouting material will cause the space after evaporation to lose the passivation of cement At the same time, the corrosion of the steel bar is easy to develop under the high stress state, which causes the section defect of the steel bar corrosion part, which threatens the safe life and reliability of the prestressed structure.

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