Abstract
Using recycled aggregate in concrete is effective in recycling construction and demolition waste. It is of critical significance to understand the fatigue properties of recycled aggregate concrete (RAC) to implement it safely in structures subjected to repeated or fatigue load. In this study, a series of fatigue tests was performed to investigate the compressive fatigue behavior of RAC. The performance of interfacial transition zones (ITZs) was analyzed by nanoindentation. Moreover, the influence of ITZs on the fatigue life of RAC was discussed. The results showed that the fatigue life of RAC obeyed the Weibull distribution, and the S-N-p equation could be obtained based on the fitting of Weibull parameters. In the high cycle fatigue zone (), the fatigue life of RAC was lower than that of natural aggregate concrete (NAC) under the same stress level. The fatigue deformation of RAC presented a three-stage deformation regularity, and the maximum deformation at the point of fatigue failure closely matched the monotonic stress-strain envelope. The multiple ITZs matched the weak areas of RAC, and the negative effect of ITZs on the fatigue life of RAC in the high cycle fatigue zone was found to be greater than that of NAC.
Highlights
Concrete is one of the most widely used building materials
The collected test data included the load of the testing machine throughout the entire process of static load and fatigue testing, the relative displacement of the upper and lower platens, and the strain of the strain gauge pasted at the center of the specimens
Fatigue life refers to the number of cycles required to induce fatigue failure to a material under cyclic loading
Summary
Concrete is one of the most widely used building materials. The annual world concrete production varies depending on the source between 13 billion and 21 billion tons [1]. The total global annual production of construction and demolition waste (CDW) has been reported to exceed 3 billion tons [3]. As waste concrete accounts for the largest proportion of CDW, crushing and grading waste concrete into recycled concrete aggregate (RCA) is an effective and important method to achieve CDW recycling and sustainable development within the construction industry. This is accomplished by partly or totally replacing natural aggregate with RCA in the preparation of recycled aggregate concrete (RAC) [5,6,7]
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