Abstract
Abstract In this article, the ABAQUS finite element software is used to simulate the bond behavior of the steel bar in salt–frost-damaged recycled coarse aggregate concrete, and the influence of the steel bar diameter and the concrete cover thickness on the bond strength is investigated. The result shows that the calculated bond–slip curve is in good agreement with the experimental bond–slip curve; the mean value of the ratio of the calculation results of ultimate bond strength to the experiment results of ultimate bond strength is 1.035, the standard deviation is 0.0165, and the coefficient of variation is 0.0159, which proves that the calculation results of the ultimate bond strength are in good agreement with the experimental results; with the increase of steel bar diameter and the concrete cover thickness, the ultimate bonding strength of RAC and steel increases; the calculation formulas for the ultimate bond strength of specimens with different steel bar diameters (concrete cover thickness) after different salt–frost cycles are obtained.
Highlights
With the vigorous development of the construction industry, concrete has been widely used as the main building material [1]
The objective of this article is to simulate the bond behavior of steel bar in salt–frost-damaged Recycled aggregate concrete (RAC) through ABAQUS finite element software, investigate the influence of the steel bar diameter and the concrete cover thickness on the bond strength and obtain the calculation formulas for the ultimate bond strength of specimens with different steel bar diameters after different salt–frost cycles
(1) The bond–slip finite element calculation curve of RAC and steel bars agreed well with the experimental curve; the finite element calculation results agreed well with the experiment results, which proves the rationality of the numerical simulation
Summary
With the vigorous development of the construction industry, concrete has been widely used as the main building material [1]. The concrete structure has a certain design life, and a number of waste concretes will be produced in the process of reconstruction and expansion [3]. Over 900 million tons of construction demolition waste were generated annually in Europe, the United States, and Japan [4]. In China, a large amount of construction waste is produced annually, of which waste concrete accounts for about 34% of construction waste [5]. In China, more than 95% of construction waste is transported to the suburbs for stacking or land-filling [6], which occupies a large number of land resources and causes a series of environmental problems [7]
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