Study on the cracking sensitivity of recycled fine aggregate concrete based on orthogonal experiment

Using recycled fine aggregate in the practical engineering provides waste concrete a sustainable utilization road and the cracking property of recycled fine aggregate concrete immediately influence the service life of concrete. The paper consults ICBO standard, carries out stationary plate method and it puts importance on the influences on the concrete, the particle size, the replacement rate of recycled fine aggregate and mineral mixes. The result indicates that the fine particles between 0 and 0.15mm are not good for the crack resistance of recycled concrete. The replacement rate of recycled fine aggregate should be controlled less than 50%. Adding a certain amount of fly ash could enhance to some extent the crack resistance of recycled fine aggregate concrete. But the plastic cracking risk of recycled fine aggregate concrete increases because of the adding silica fume.