A large-volume concrete mixture and its construction method for pouring walls

Abstract

The invention relates to a mass concrete mixture and a construction method of pouring a wall body by the mass concrete mixture. The technical scheme adopted by the invention is that the mass concretemixture is prepared from the following raw materials in parts by weight: 165 parts of water, 214 parts of portland blast furnace slag cement, 743 parts of sand, 1070 parts of gravel, 103 parts of flyash, 95 parts of mineral powder, 4.94 parts of admixture and 0.9 part of polypropylene fibers, wherein the admixture is prepared from a JH-GHL polycarboxylate superplasticizer, an H-III type concrete mortar water-proofing agent, a UEA-H type concrete expanding agent, basic aluminum acetate and delta-aluminum oxide of which the weight ratio is 4 to 3 to 2 to 0.2 to 0.3. The construction method comprises the steps of pre-construction preparation, weighing of the raw materials, stirring of the raw materials, pouring, vibrating, primary leveling, maintenance, secondary leveling and measurement of the temperature. In the construction process of a mass concrete structure, indwelling of a post pouring belt can be avoided, the construction progress is speeded up and the construction period is shortened; in addition, without structural cracks, the overall stability of the structure is improved and the waterproof quality of a project can be ensured.

Description

technical field [0001] The invention relates to the technical field of concrete building construction, more specifically, it relates to a large-volume concrete mixture and a construction method for pouring walls thereof. 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 favored by developers. In the construction industry, super-long concrete is used as a construction project. One of the main materials used in the process, its concrete members 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. Super-long conc...

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

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