Expanded concrete for construction of extra-long concrete structures

Abstract

The invention relates to an expansive concrete for the construction of a super long concrete structure. The expansive concrete comprises, by mass, 170-175 parts of cement, 165-170 parts of water, 215-225 parts of fine sands, 510-515 parts of machine-made sand, 220-230 parts of fine stones, 880-890 parts of medium stones, 110-113 parts of fly ash, 96-99 parts of ground slag powder, 8.4-9.1 parts of a DF-6 set retarding superplasticizer and 40-41 parts of an HCSA expanding agent. The expansive concrete has the advantages of avoiding of reservation of late poured bands in the construction process of the super long concrete structure, acceleration of the construction schedule, shortening of the construction period, and realization of the improvement the overall stability of the structure and guaranteeing of the waterproof quality of the engineering due to no structural cracks.

Description

technical field [0001] The invention relates to the field of concrete, more specifically, it relates to an expansive concrete used for super-long concrete structure construction. Background technique [0002] With the continuous acceleration of the urbanization process in our country, the urban population has begun to rise sharply. As a building form that can accommodate a considerable number of residents, high-rise buildings have become more and more popular. In the construction industry, super-long concrete is used as a construction process in construction projects. One of the main materials used in the building, its concrete components are the most important load-bearing components of the building structure. [0003] With the rapid development of my country's construction industry, super-long concrete structures have been widely used in construction engineering, and occupy an important position in modern engineering construction. In industrial and civil buildings, super-l...

AI Technical Summary

Problems solved by technology

According to the specification, after the shrinkage of the concrete on both sides of the post-cast belt is basically stable, it takes about 42 days before the post-cast belt can be backfilled with expansive concrete, which will obviously prolong the construction period.

Moreover, due to the time difference between post-pouring and concrete pouring, plastic shrinkage or dry shrinkage cracks often occur at the junction of new and old concrete.

The original intention of setting the post-casting belt is to prevent cracks in the structure, but due to various reasons, two through cracks are often artificially created at the post-casting belt, which may easily cause water leakage, cause corrosion of steel bars, and then affect the safety of the structure. It often becomes a hidden danger of leakage; in addition, the combination of post-cast concrete and pre-cast concrete is relatively weak, which will affect the integrity and safety of the structure

Images