MESO EXPERIMENTAL INVESTIGATION OF FIBER REINFORCED CEMENTITIOUS COMPOSITES UNDER COMPRESSION AND SHEAR LOADING
MESO EXPERIMENTAL INVESTIGATION OF FIBER REINFORCED CEMENTITIOUS COMPOSITES UNDER COMPRESSION AND SHEAR LOADING
复制标题
DOI：
--
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
X. Songlin;Tang Zhiping
中科院分区：
文献类型：
--
作者：
X. Songlin;Tang Zhiping
通过准静态单轴压缩试验和细观压剪试验，研究了聚丙烯微纤维-钢纤维水泥混凝土复合材料的破坏特性。对比两种纤维在两种加载条件下对复合材料的影响，试验结果表明，在准静态单轴压缩条件下，钢纤维的作用明显，而聚丙烯微纤维的作用不明显；而在压剪载荷作用下，钢纤维对复合材料各变形阶段均表现出明显的增强作用，而聚丙烯微纤维只在破坏前的阶段对复合材料起到增强作用，不能提高极限剪切强度。在细观实验中观察到复合材料中钢纤维和碎石的脱粘和断裂。然而，仅在水泥的局部观察到孔洞坍塌现象。孔洞坍塌导致压实带形成的机理有待进一步研究。
Quasi-static uniaxial compression experiments and meso compression-shear experiments were carried out to investigate the failure properties of polypropylene micro-fiber and steel fiber reinforced cement and concrete composites. Comparing the effects of two kinds of fibers on the composites under these two loading conditions, experimental results show that under quasi-static uniaxial compression, the effects of steel fiber are evident, and those of Polypropylene micro-fiber are not; while under compression and shear loading, steel fiber took on evident effects on the strengthening of the matrix in all of the deformation stages, but polypropylene micro-fiber only reinforced the matrix in the stages before failure and can not improve the ultimate shear strength. The debonding and fracture of steel fiber and gravels in the composites were observed in the meso experiments. However, the void collapse phenomenon was observed only in local of the cement. The mechanism that void collapse will lead to the formation of the compaction band needs to be revealed in further studies.