Mechanical performance investigation on fiber strengthened recycled iron tailings concrete

Abstract

Recycled aggregate concrete has received much attention in recent years. Using tailings sand in concrete can save natural resources and create environmentally friendly building materials. Simultaneously, adding iron tailings can compensate for the loss of strength caused by recycled aggregates and enhance performance. The mechanical properties of recycled aggregate concrete with iron tailings and prepared concrete specimens with iron tailings sand content of 0%, 25%, 50%, 75%, and 100% were studied. Mechanical tests are conducted to evaluate the performance with the assistance of PVA fibers. The patterns of change in numerical values such as compressive strength, flexural strength, and peak strain of recycled concrete specimens are tested and analyzed, and the experiment's effectiveness is demonstrated through finite element numerical simulation. The results show that when the TRAC content is 50%, the working performance of recycled concrete reaches its peak; When the TRAC content exceeds 50%, the positive effect of tailings sand on the performance of concrete decreases; The strength of TRAC concrete increases with the increase of PVA fiber content; Improving the replacement rate of recycled iron tailings aggregate can increase the peak strain of the specimen under cyclic loading, and the stress-strain curve calculated by finite element software is consistent with the experimental results.

Keywords

• Compressive strength
• Flexural strength
• Numerical simulation
• Fiber reinforced recycled concrete