Experimental research on contact explosion resistance of ultra-early-strength reinforced concrete slab
UR50 ultra early strength cement-based self compacting high-strength material has the advantages of short curing time and fast early strength development,making it an ideal material for rapid repair and construction of key facilities during wartime.A series of contact explosion studies were conducted to investigate the blast resistance performance of UR50 ultra early strength cement-based self compacting high-strength reinforced concrete slabs(URCS).Ultra early strength cement-based reinforced concrete slabs with curing durations of 28 days and 24 hours,as well as a regular concrete slab(NRCS),were used as controls.The failure modes and characteristics of concrete slabs under different curing times were analyzed through experiments.The results showed that URCS has stronger blast resistance compared to NRCS.The failure modes of URCS under contact explosion are frontal explosion pit formation and back layer cracking and collapse.As the charge amount increases,its failure mode gradually changes to explosive penetration and explosive punching.The URCS curing time of 24 hours can achieve the blast resistance performance of 28 days.Based on the experimental results,the range of seismic collapse coefficients for different failure modes is determined,and the damage parameters of the structure are quantified and statistically analyzed.Empirical formulas are established to predict the diameter of excavation and layer cracking.
万方数据
维普
