High-performance prestressing duct grouting agent and preparation method thereof

Abstract

The invention discloses a high-performance prestressed channel grouting agent, which is prepared from the following components according to the following weight ratio: water reducing component 1-10%, water-retaining component 15-40%, plastic-retaining component 1 ~10%, viscosity-increasing component 0.03-0.3%, retarding component 0-0.5%, plastic expansion component 0.1-1%, later volume expansion component 50-70%. The high-performance prestressed channel grouting agent of the present invention can make the slurry obtain high fluidity and high plastic stability, greatly reduce the phenomenon of segregation and delamination, and have no bleeding and grouting. Fullness; the prepared slurry has high volume stability throughout the whole process, and the micro-expansion in the plastic and hardening stages can effectively compensate for various shrinkages; and the slurry has outstanding early strength, high strength, and excellent durability, and is suitable for various prestressed tunnel constructions. At the same time, the composition of the bagged admixture package is more uniform than that prepared on site, the transportation and comprehensive costs are low, and the technical and economic benefits are obvious.

Description

technical field [0001] The invention belongs to the field of building materials, and relates to a prestressed tunnel grouting admixture, in particular to a high-performance prestressed grouting agent for prestressed reinforced concrete tunnels and a preparation method thereof. Background technique [0002] Post-tensioned prestressed concrete technology has been widely used in long-span spaces and tower-mast structures due to its advantages in reducing the weight of the structure and improving the stress of the structure. However, these advantages are all based on the good bonding between post-tensioned prestressed steel bars and concrete structures. In the future, there will be more and more prestressed projects such as building structures, underground building structures, dams, and marine engineering structures, and the demand for grouting materials will increase by leaps and bounds. The quality of tunnel grouting will directly affect the safety and reliability of the stru...

AI Technical Summary

Problems solved by technology

[0005] Checked previous patent documents, Chinese patent CN1559960A "post-tensioned high-performance grouting admixture for bonded prestressed concrete", Chinese patent CN101462861A "post-tensioning method The grouting materials for prestressed concrete tunnels and their preparation methods all use aluminum powder to generate gas to compensate for the shrinkage in the plastic stage, but the amount of gas generated by aluminum powder as an expansion source is unstable, the speed is too fast to control, and it is easy to cause hydrogen embrittlement

The fluidity in the Chinese patent CN101602589A "Post-tensioned prestressed pipeline vacuum grouting or grouting prefabricated material and its preparation method" is between 18 and 25s, which is far from meeting the requirements in the new bridge standard, and there is no counter pressure in the patent Achievable compressive and flexural strength of pulp material shall be specified

Chinese patent CN101157529A "A High Performance Cement-Based Non-shrinkage Anti-corrosion Grouting Agent" adopts 0.34 water-cement ratio, which is far higher than the range of 0.27±0.01 specified in the industry standard JTG / T F50-2011, and in Under high water-cement ratio, the fluidity of the prepared slurry is not ideal