Abstract
The mechanical performance of steel slag concrete (SSC) under biaxial compression is investigated by a servo-controlled static-dynamic true triaxial machine (TAWZ-5000/3000). Three replacement ratios of steel slags and four kinds of stress ratio (0.25:1, 0.5:1, 0.75:1, and 1:1) are examined in this study. According to the test results, the influences of replacement ratio and stress ratio on the strength, deformation properties, stress–strain curves, and failure mode of SSC are analyzed. The results show that the failure mode of SSC under biaxial compression is plate-splitting crack. Both the strength and deformation of SSC are larger than the corresponding values of the uniaxial compression. Under the same stress ratio, the value of principal stress increases first and then decreases with the increase in the replacement ratio. Under the same replacement ratio, increases first and then decreases as the stress ratio increases, and the maximum of is obtained at the stress ratio of 0.5:1. Based on the analysis and test data, the strength failure criterion of SSC under biaxial compression stresses is proposed.
Highlights
Steel slags, which are by-products of steel-making, are annually produced in a huge quantity, and landfilling steel slag will occupy land resources and pollute the environment [1,2]. the recycling rate of steel slag covers 65% in Europe [2,3], it is still very low in developing countries, such as China and Vietnam [1,4,5]
The results revealed that theratio on the replacement ratio and stress ratio had great influences on peak strain
The angle between the of cracksbiaxial and the principal axis decreases as the stress ratio crack
Summary
Steel slags, which are by-products of steel-making, are annually produced in a huge quantity, and landfilling steel slag will occupy land resources and pollute the environment [1,2]. the recycling rate of steel slag covers 65% in Europe [2,3], it is still very low in developing countries, such as China and Vietnam [1,4,5]. The recycling of steel slag still is a problem. The use of steel slag instead of crushed stone alleviates the shortage of concrete resources, and solves the problems of steel slag reuse and environmental damage. Steel slags are mainly used in road construction, cement and concrete, and asphaltic concrete [10]. Steel slag concrete (SSC) can be used in construction areas with special requirements due to the characteristics of steel slag [11]. It has great significance in the application of steel slag in concrete
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