刚玉骨料超高性能水泥基材料抗侵彻试验和细观数值模拟

发布时间：2018-10-09 15:45

【摘要】：混凝土抗钻地武器侵彻能力由基体强度和骨料硬度与粒径共同控制。为了研发具备更高抗侵彻能力的混凝土材料,利用刚玉超高强高硬的特点,将刚玉碎石作为粗骨料,制备出刚玉骨料超高性能水泥基材料(CA-UHPCC)。开展了不同骨料粒径(5~20 mm、35~45 mm、65~75 mm)的CA-UHPCC以及高强混凝土(HSC)靶体的中等口径弹体侵彻试验。通过与前期完成的玄武岩骨料超高性能水泥基(BA-UHPCC)靶体的弹体侵彻试验进行对比,验证了CA-UHPCC较BA-UHPCC和HSC具备更加优异的抗侵彻性能。进一步建立了考虑粗骨料形状随机生成和空间位置随机分布以及粗骨料/砂浆界面层的混凝土三维细观模型,对弹体冲击速度,骨料类型和体积率对混凝土靶体抗侵彻性能的影响进行了细观数值模拟。结果表明,靶体抗侵彻能力随着骨料强(硬)度,粒径和体积率的增大而提高,高强(硬)度和大粒径(大于1.5倍弹径)粗骨料可引起弹体磨蚀和断裂。
[Abstract]:The penetration resistance of concrete is controlled by matrix strength, aggregate hardness and particle size. In order to develop concrete material with higher penetration resistance, corundum gravel was used as coarse aggregate to prepare corundum aggregate ultra-high performance cement-based material (CA-UHPCC) by using corundum super high strength and high hardness. The penetration tests of CA-UHPCC with different aggregates (5 ~ 20 mm,35~45 mm,65~75 mm) and (HSC) target with high strength concrete were carried out. By comparing with the penetration test of basalt aggregate with ultra-high performance cement based (BA-UHPCC) target, it is proved that CA-UHPCC has better penetration resistance than BA-UHPCC and HSC. Furthermore, a three-dimensional mesoscopic model of concrete considering the random generation of coarse aggregate shape and random distribution of space position and interface layer of coarse aggregate and mortar is established, and the impact velocity of projectile is obtained. The effects of aggregate type and volume ratio on the penetration resistance of concrete target were simulated. The results show that the penetration resistance of the target increases with the increase of the strength (hardness), particle size and volume rate of the aggregate, and the high strength (hardness) and the large particle size (greater than 1.5 times the diameter of the projectile) can cause abrasion and fracture of the projectile.
【作者单位】：解放军理工大学爆炸冲击防灾减灾国家重点实验室;江苏省建筑科学研究院高性能土木工程材料国家重点实验室;
【基金】：国家自然科学基金创新研究群体科学基金(51321064);国家自然科学基金重点项目(51438003)
【分类号】：TU528

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