Method for observing rusted cracks of reinforced concrete based on two-stage rust crack model

Abstract

The invention discloses a method for observing rusted cracks of reinforced concrete based on a two-stage rust crack model. The method comprises the following steps of: (1) mixing epoxy resin and a curing agent in proportion to form low-viscosity epoxy resin; (2) dripping or infiltrating the low-viscosity epoxy resin into rusted cracks of the reinforced concrete, and protecting and cutting a rusted crack test piece, thereby obtaining a sheet-shaped sample; (3) polishing the sheet-shaped sample until the sample having smooth surface, clear reinforcing steel bar / concrete boundary rusty scale structure and clear rusted crack boundary is obtained; (4) scanning the sample, observing the hierarchy of different substances at the reinforcing steel bar / concrete boundary and the distribution of rusted crack region, and measuring the thickness of reinforcing steel bar rusty scale, the thickness of a rust filling region and other corresponding data; (5)calculating data, and building a prediction model of the rusted cracks of reinforced concrete. The method disclosed by the invention can be used for measuring the distribution of the rust filling region and the rust scale accurately so as to obtain corresponding test parameters precisely and build the prediction model.

Description

technical field [0001] The invention relates to the technical field of durability detection of civil engineering concrete structures, in particular to a method for observing reinforced concrete rust cracks, which is mainly based on a two-stage rust crack model created by the inventor. Background technique [0002] The rust cracking process of reinforced concrete structures refers to the whole process of cracking due to the tensile stress of the concrete protective layer caused by the corrosion of steel bars in the concrete structure. Once cracks appear in the concrete protective layer, harmful media such as chloride salts in the environment will directly invade the interior of the concrete through the cracks and contact the steel bars, which will greatly intensify the corrosion of the steel bars, and even cause the peeling of the concrete protective layer, eventually leading to the failure of the concrete structure. Therefore, the rust cracking process of reinforced concrete...

AI Technical Summary

Problems solved by technology

[0005] However, due to objective factors such as the difference in hardness between concrete and steel bars, and the fragility of concrete with rust-swelling cracks, it is very easy to damage the rust-cracked concrete specimen during the production and observation process of the rust-cracked concrete specimen. This leads to the further development of rust swelling cracks, and even the cracking and peeling of the concrete protective layer, which affects the accurate measurement of the concerned data

Looking at the existing concrete rust crack observation technology, it is impossible to observe and measure key geometric parameters such as the thickness of the steel rust layer inside the rust-cracked concrete, the thickness of the rust-filled area, the length and width of the rust-swelling crack, and thus cannot be accurate and reasonable. Predicting the time of concrete surface rust cracking accurately

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