Preparation method of ductile retarding fine aggregate concrete with initial setting time of 48-72 hours

Abstract

The invention discloses a preparation method of ductile retarding fine aggregate concrete with initial setting time of 48-72 hours, belongs to the technical field of building construction, and particularly relates to a preparation technology of the ductile retarding fine aggregate concrete. Cement, fly ash, slag powder and a reinforcing compacting agent are adopted to form a cementing material, and the fly ash, the slag powder and the reinforcing compacting agent not only improve the performance of a concrete mixture, but also can improve the early-stage or later-stage strength of concrete, improve the pore structure and improve the compaction performance of the concrete; meanwhile, the effects of saving resources and protecting the environment are achieved. The concrete is suitable for pier wall reinforced concrete structures in the fields of construction engineering, water conservancy engineering, traffic engineering, water transportation engineering and the like, a layer of ductileretarding concrete is poured at the root of the pier wall, and the concrete can also be suitable for underground secant piles and structural construction joints needing to be poured by several times.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to the preparation technology of ductile retarded fine stone concrete. Background technique [0002] At present, the problem of pier wall cracking in reinforced concrete buildings in the fields of construction engineering, water conservancy engineering, traffic engineering, water transportation engineering, etc. is prominent, which is caused by temperature shrinkage, autogenous shrinkage, plastic shrinkage, drying shrinkage, etc. When the deformation is constrained by the substructure, temperature stress is generated. Ordinary concrete has high compressive strength, but low tensile strength, the tensile strength is only 1 / 8-1 / 13 of the compressive strength, the modulus of elasticity is high, and the ductility of concrete is low; when the temperature stress of concrete exceeds the tensile strength When the strength is high, the concrete will crack. In orde...

AI Technical Summary

Problems solved by technology

[0003] Walls with a height of more than 10m require a long pouring time. If the pouring process is suspended for some reason, cold construction joints may be formed