An experimental investigation into effects of blast-induced vibration on strength of early-age concrete

By taking a large airport engineering as an example, the damages to early-age concretes under blasting vibration were experimentally investigated. Pendulum experiments were carried out on the C30 plain concrete cubic specimens at different ages. And the uniaxial compression experiments were conducted on the two groups of concrete cubic specimens, which were subjected to the same impact loads at the same ages, at 18 and 28 days of the same water curing, respectively. The corresponding uniaxial compressive strengths were measured. The results show that the curing time can affect the uniaxial compressive strengths of early-age concretes exposed to blasting vibration and blasting vibration can more obviously decrease the uniaxial compressive strengths of 3-5 days old concretes. Based on the above experimental results, the compressive strength evolution of early-age concretes subjected to blasting vibration at different curing ages was revealed by combining with the site test and the numerical simulation. And the security technology indexes were proposed for large engineering construction projects consisting of concreting and blasting.