Post-tensioned pre-stressed concrete beam pipeline grouting agent

Abstract

The invention provides a post-tensioned pre-stressed concrete beam pipeline grouting agent. The post-tensioned pre-stressed concrete beam pipeline grouting agent comprises the following components in parts by weight: 0.5-10 parts of a water reducing agent, 0.1-5 parts of a plastic expanding agent, 5-20 parts of a hardening swelling agent, 5-15 parts of a suspending agent, 0.001-0.05 part of a water-retaining agent, 0.01-0.5 part of an antifoaming agent, 0.1-4 parts of a thixotropic agent, 0.1-8 parts of a lubricating agent and 10-80 parts of a mineral admixture. The post-tensioned pre-stressed concrete beam pipeline grouting agent has the beneficial effects that the pipeline grouting agent has the characteristics of being quick in flow second, good in fluidity retaining, good in slurry stability, un-bleeding and the like, and therefore, the pipeline grouting agent can be used for effectively protecting steel strands, is suitable for post-tensioned pre-stressed concrete beams of road bridges and culverts, and also can be used for concrete structure pipeline grouting of general engineering.

Description

technical field [0001] The invention relates to a grouting agent for post-tensioned prestressed concrete beam pipelines of highway bridges and culverts. Background technique [0002] In the post-tensioning prestressing construction, how to make the pipeline grouting dense, not delaminated, uniform in strength, steel strands not corroded, and prestress loss small is a problem that must be considered in structural projects such as bridges that have been used for more than 100 years in recent years. In Europe, three bridges collapsed due to the use of aluminum powder as the expansion source, insufficient pipe grouting, and reduced strength. Two were the Bickton Meadoms Bridge and Ynysy Gwas Bridge in the UK, and the other was the Schelde Bridge in Belgium. The cable steel wires of a cable-stayed bridge in Guangdong, my country were severely corroded, so that all of them needed to be replaced. Among many bridges in our country, due to the quality of grouting, the steel strands ...

AI Technical Summary

Problems solved by technology

Chinese patent applications: [200910258947.1], [200910009480.7] and [201010571084.6] The published patents meet the requirements of the standard TB / T 3192-2008 "Technical Conditions for Railway Post-tensioned Concrete Beam Pipeline Grouting", but all have water-cement ratios The defects of too large, too long flow seconds, and too long construction time do not meet the requirements of JTG / F50-2011 "Technical Specifications for Construction of Highway Bridges and Culverts"