爆破冲击对早龄期混凝土强度影响的实验研究

以某大型全碎石填方机场工程为背景,针对早龄期混凝土受爆破振动损伤开展了实验研究。通过室内实验模拟场地爆破振动作用于早龄期混凝土试块，测量了不同龄期混凝土受振损伤后的强度。并将实验结果与有限元数值计算和现场爆破场地测试数据相结合，分析了早龄期混凝土损伤后的强度增长规律，建立了场地爆破与混凝土结构浇筑平行施工的安全技术指标。

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.