Fabricated concrete under common environment and design method of bonding interface of fabricated concrete

Abstract

The invention discloses fabricated concrete under a common environment and a design method of a bonding interface of the fabricated concrete, and relates to the technical field of fabricated buildings. The method comprises the steps that according to the first carbonization depth of a first base body, the second carbonization depth of a second base body and the time from the curing completion time to the detection time, a carbonization coefficient is obtained; the maximum coarse aggregate diameter of the bonding interface layer is obtained; and according to the carbonization coefficient and the thickness of a protective layer, the actual carbonization depth of the interface layer when carbonization reaches a corrosion critical state is obtained; according to the actual carbonization depth, the carbonization coefficient and the maximum coarse aggregate diameter, the inclination angle and the sunken depth of the bonding interface are obtained; and according to the inclination angle and the sunken depth, the zigzag bonding interface is constructed. According to the fabricated concrete under the common environment and the design method of the bonding interface of the fabricated concrete, the carbonization coefficient of the concrete bonding interface and the roughness parameter of the concrete bonding interface are quantitatively determined, and the durability service life of a fabricated concrete structure can be significantly prolonged.

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...

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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.

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