Structure capable of preventing concrete long wall early cracking, construction method and application

Abstract

The invention relates to a structure capable of preventing concrete long wall early cracking, a construction method and application. The structure comprises an existing concrete wall body, a newly poured concrete wall body, and a concrete retarded coagulation layer arranged between the existing concrete wall body and the newly poured concrete wall body. The coagulation time of the concrete retarded coagulation layer is at least five days, the concrete retarded coagulation layer reaches the design strength within 28 days after pouring, and the percentage of contraction is 0%; and the concrete retarded coagulation layer comprises 0.5%-1% of a retarder by weight, and the retarder comprises the following components including, by weight, 100-200 g / L of gluconic acid, 200-300 g / L of citric acid,10-50 g / L of sodium tripolyphosphate and 10-50 g / L of sodium pyrophosphate. The structure is good in anti-cracking effect and easy in construction.

Description

technical field [0001] The invention belongs to the field of civil engineering construction, and in particular relates to a structure, construction method and application for preventing early cracking of long concrete walls. Background technique [0002] Concrete is a mixture of various materials, and is also a brittle material. Under the action of internal and external forces, cracks are unavoidable. A large number of engineering practices have shown that the causes of cracks in reinforced concrete structures are complex, and even a variety of factors affect each other. The main reason for cracks in concrete is that the deformation of concrete is restricted or the action of external forces. Cracks may occur. Among them, deformation load is an important factor causing cracks. [0003] Deformation load refers to temperature shrinkage, dry shrinkage deformation and uneven settlement, etc. Since the side wall is a thin-walled concrete structure, the main causes of cracks are ...

AI Technical Summary

Problems solved by technology

In order to prevent different concretes from being deformed differently in dry shrinkage deformation and temperature shrinkage deformation, resulting in cracking, the above-mentioned patent sets an elastic reserved plate between the existing building and the newly poured cement concrete surface to separate the two, Eliminate shrinkage constraints and prevent deformation and cracking. However, this material itself has no reliable connection with the old and new concrete. The caulking asphalt ointment poured after being removed cannot meet the requirements of use and seriously affects the overall performance of the structure. For high-rise buildings This anti-cracking layer structure is not suitable for places such as buildings that require high structural integrity and strength

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