钢纤维无粗集料超高强混凝土的抗侵彻性能研究

摘要

The toughness of steel fiber ultra-high strength concrete without coarse aggregate was modified by adding steel fiber whose volume fraction was 3% into ultra-high strength concrete without coarse aggregate.In order to study on anti-penetration characteristics of steel fiber ultra-high strength concrete without coarse aggregate with different strength grades, the process of a bullet penetrating concrete target was analyzed by the mean of dynamic nonlinear finite element and the velocity time's curve and the dynamic failure process of target was got.The results showed that under the same of velocity, as the improvement of concrete strength grade, residual velocity of the bullet and the level of material damage significantly decreased.Under the condition of the same mixture ratio and different curing conditions, anti-preparation characteristics of artificial sea water curing of concrete material were more stronger than fresh water conservation.%通过在无粗集料超高强混凝土中加入体积掺量为3%的钢纤维来对其增韧改性,得到钢纤维无粗集料超高强混凝土.为了研究不同强度等级的含钢纤维无粗集料超高强混凝土材料的抗侵彻性能,采用动力有限元程序分析子弹侵彻钢纤维无粗集料超高强混凝土,得到了子弹的速度时间历程曲线和靶体的动态破坏过程.结果表明,在相同的侵彻初速度下,随着混凝土强度等级的提高,子弹的剩余速度明显降低,材料破坏程度明显减弱.在配合比相同而养护条件不同的情况下,人工海水养护制备的混凝土材料比淡水养护而成的抗侵彻性能更强.