A Design Method for Prefabricated Concrete and Its Joint Interface in Common Environment

Abstract

The invention discloses a prefabricated concrete under the action of ordinary environments and a method for designing a joint interface thereof, and relates to the technical field of prefabricated buildings. The method includes: obtaining the carbonization coefficient according to the first carbonization depth of the first base body and the second carbonization depth of the second base body, and the time from the completion time of the curing to the detection time; obtaining the maximum coarse aggregate of the bonding interface layer Diameter; according to the carbonization coefficient and the thickness of the protective layer, the actual carbonization depth at the interface layer is obtained when the carbonization reaches the corrosion critical state; according to the actual carbonization depth, carbonization coefficient and the maximum coarse aggregate diameter, the angle and height of the sawtooth of the zigzag joint interface are obtained; According to the angle and the height, a jagged bond interface is constructed. The invention quantifies and determines the carbonization coefficient of the concrete bonding interface and the roughness parameter of the concrete bonding interface, and can significantly prolong the durability service life of the assembled concrete structure.

Description

technical field [0001] The invention relates to the technical field of prefabricated buildings, in particular to a method for designing prefabricated concrete and its joint interface in common environments. Background technique [0002] Concrete bonding interfaces widely exist in concrete structures, such as structural joints such as construction joints, settlement joints, and expansion joints during concrete pouring, splicing joints during wet installation of prefabricated components, and joints between old and new concrete in structural repair and reinforcement. Wait. The concrete bonding interface is composed of different concrete matrix, interface layer and interface reinforcement. The material properties and hydration degrees of different concrete matrices near the interface layer are different, and there is a deformation coordination problem in the interface layer. Under the action of load and shrinkage, it is easy to form weak links; on the other hand, these weak int...

AI Technical Summary

Problems solved by technology

The material properties and hydration degrees of different concrete matrices near the interface layer are different, and there is a deformation coordination problem in the interface layer. Under the action of load and shrinkage, it is easy to form weak links; on the other hand, these weak interface layers provide convenient transmission for harmful substances The method accelerates the corrosion of interfacial reinforcement, and the volume expansion of corrosion products will aggravate the damage of the bonding interface, resulting in reduced durability or even failure of the structure near the bonding interface.

The failure cases caused by the insufficient durability of the concrete bonding interface are not uncommon, seriously affecting the applicable performance of the structure, and threatening the safe service of the structure

[0003] In the general atmospheric environment, the interface of prefabricated concrete is easily eroded by carbon dioxide, which reduces the alkaline environment inside the concrete, which leads to the bluntness and corrosion of steel bars, seriously affects the durability of concrete structures, and even endangers the safe service of structures.

Images