Efficient corrosion inhibifing water reducing and plasticity keeping agent for steel pipe concrete

Abstract

The efficient set retarding water reducing and plasticity keeping agent for steel pipe concrete is water solution with solid content of 30-36 % compounding polycarboxylic acid water reducing agent 87-94.5 wt%, sodium gluconate 5-10 wt% and zinc sulfate 0.5-3 wt%. The efficient set retarding water reducing and plasticity keeping agent of the present invention has the advantages of low gas introducing amount, high water reducing rate and high plasticity keeping performance, and can raise the flowability and construction performance of newly stirred steel pipe concrete, lower the air content of concrete, improve the adhesion between steel pipe wall and concrete, raise the strength and durability of steel pipe concrete and raise the bearing capacity of the steel pipe concrete structure.

Description

technical field [0001] The invention belongs to the category of concrete admixtures, and in particular relates to a retarding, high-efficiency, water-reducing and plastic-retaining agent for steel tube concrete. Background technique [0002] Due to its outstanding advantages and characteristics, the CFST structure has broad application prospects in modern high-rise buildings and long-span arch bridges. The construction technology of concrete-filled steel tubes mostly adopts the pumping jacking method, so special requirements are put forward for the working performance and hardening performance indicators of concrete-filled steel tubes: firstly, the concrete is required to have good pumpability and operability (the initial setting time must meet the requirements of concrete The time required for pumping jacking and the slump loss of fresh concrete in a long period of time should be small); second, the concrete is required to have suitable compensation shrinkage performance an...

AI Technical Summary

Problems solved by technology

In the vicinity of the vault of the steel pipe arch, the phenomenon of air adsorption and enrichment caused by concrete gravity settlement and pumping pressure is more serious, so the probability of debonding is greater, thereby reducing the integrity of the steel pipe concrete structure and deteriorating Its structural mechanical properties

In addition, sulfamic acid water reducers are easy to cause concrete to bleed, and the concrete prepared with naphthalene water reducers has a large loss of slump over time, and it is difficult to prepare high-performance steel pipe expansion concrete that meets the construction requirements.