纤维混杂高性能水泥基材料力学性能试验研究

Experimental Study on Mechanical Performance of Hybrid Fiber High Performance Cementitious Composite

采用玄武岩纤维与钢纤维混杂的方式制备了一种纤维混杂高性能水泥基复合材料(HFHPCC)。研究了不掺纤维、单掺1.0%钢纤维、玄武岩纤维与钢纤维混杂掺量1.0%和2.0%4种工况下HFHPCC的压缩性能,以及玄武岩纤维与钢纤维混杂掺量1.0%和2.0%两种工况下HFHPCC的拉伸性能。结果表明,玄武岩纤维体积替代率为50%时,HFHPCC的峰值压应力、峰值压应变、压缩峰前韧性分别提高28.72%、2.30%、13.06%,压缩弹性模量无明显变化,但压缩韧性下降。提高混杂纤维掺量后,HFHPCC拉伸试件应变硬化特性更明显,峰值压应力、峰值压应变、压缩峰前韧性、压缩韧性分别提高5.76%、6.74%、1.59%和104.47%,开裂应力、峰值拉应力、峰值拉应变、开裂韧性和拉伸峰前韧性分别提高27.00%、59.09%、208.70%、172.22%、657.95%,并能有效减缓峰值应力后压缩应力和拉伸应力的衰减速率。

A hybrid fiber high performance cementitious composite(HFHPCC)was produced in which the basalt fiber and steel fiber had been mixed together in an appropriate ratio.The compression performance of HFHPCC was tested with four fiber combination scenarios of no fiber,steel fiber volume percentage of 1.0%,the combination of 0.5%basalt fiber and 0.5%steel fiber,and the combination of 1.0%basalt fiber and 1.0%steel fiber.Furthermore,the tensile performance of HFHPCC with hybrid combination of basalt fiber and steel fiber was experimentally studied.The results show that the peak compression stress,peak compression strain and peak compression toughness of HFHPCC increase by 28.72%,2.30%and 13.06%,respectively when the replacement rate of basalt fiber volume percentage reaches 50%,and the compression elastic modulus changes insignificantly,but the compression toughness decreases.With the growth of hybrid fiber volume percentage,HFHPCC tensile specimens present obvious characteristic of strain hardening.The peak compression stress,peak compression strain,peak compression toughness and compressive toughness has an increase of 5.76%,6.74%,1.59%and 104.47%respectively.The cracking stress,peak tensile stress,peak tensile strain,cracking toughness and peak tensile toughness have increased by 27.00%,59.09%,208.70%,172.22%and 657.95%respectively.The attenuation rate of HFHPCC in both compression and tension after peak stress could effectively slow down.