High performance grouting addition for concrete with post-tensioning binding prestressing force

Abstract

The invention is a special additive for post-tensioned cohesive prestressed concrete structure, prepared of the following components in weight percent: phenyl sulfonate formaldehyde high-grade condensation compound 2-10%, aluminum powder 0.005-0.05%, anhydrite 50-70%, calcined kaoline 10-20%, kaoline 10-20%, linear high-molecular anion polysaccharide 0.05-1.5%, and triterpenoid saponin 0.05-0.1%. It has multiple functions of improving both the rheological property of grouting material and the bulk stability, and after doped, it is unnecessary to compound other materials to effectively improve the rheological property of grout, largely reducing seepage water and avoiding high separation and stratification, and it can effectively compensate shrinkage in plastic and hardening state, enhancing the bulk stability of the grout. The fluidity is basically not lost in 2 hours, the grout is full and dense in the pipeline and has strong adaptability to temperature, and the economic benefits of the technique are obvious. After doped in the cement, it adopts ordinary pressure grouting technique to be able to effectively ensure the grout basal body does not seep water after grouted and the bulk of the grout does not shrink and corrode steels.

Description

technical field [0001] The invention belongs to a special admixture for post-tensioned prestressed concrete structures, in particular to a high-performance grouting admixture for post-tensioned prestressed concrete. Background technique [0002] In post-tensioned prestressed concrete structures, based on durability and economic requirements, almost all large-scale projects at home and abroad, such as bridges, nuclear power plant containment, large spans, towering towers, and giant structures, have successfully adopted bonded prestressed concrete structures. Concrete has achieved obvious technical and economic benefits. However, all the advantages of bonded prestressed concrete must be based on the well-bonded prestressed tendons and structural concrete. The quality of grouting will directly affect the safety and reliability of the structure, and grouting has become a key process in the construction of bonded prestressed concrete. [0003] Non-shrinkage grouting agents are ...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem that the grouting quality of post-tensioned bonded prestressed concrete cannot be guaranteed in China at present, and provides a post-tensioned bonded prestressed concrete high-performance grouting additive that can comprehensively improve the rheology and volume stability of the grouting material. agent

Images