Four additional
100 200 mm cylinders were prepared from two mixes for evaluating the compressive strength at
56 and 84 days. In addition, two 150 300 mm cylinders for each mix were prepared and tested to determine
the indirect tensile strength at 28 days. The results showed that 0.5 h of rubber pre-treatment using
NaOH solution, 0% of silica fume replacing cement by weight, and 350 kg/m3 cement content were the
best alternatives in this assessment range to enhance the CRC performance.