不同短切纤维对珊瑚混凝土力学性能的影响

研究了不同短切纤维(改性聚丙烯纤维MPPF、仿钢纤维ISF、玄武岩纤维BF)及掺量对珊瑚混凝土力学性能的影响,并对其破坏形态进行了分析。结果表明,纤维珊瑚混凝土早期抗压强度增长速率快而后期强度增长速率缓慢;当珊瑚混凝土中分别掺入1 kg/m^3、2 kg/m^3和3 kg/m^3的MPPF与ISF时,珊瑚混凝土的抗压强度、劈裂抗拉强度与抗折强度较空白组均有所增加;相比于ISF,MPPF对珊瑚混凝土力学性能的改善效果更为显著,且最佳MPPF掺量为2 kg/m^3;当珊瑚混凝土中掺入BF时,珊瑚混凝土的力学性能有所降低;掺加纤维可以改善混凝土的脆性,使其破坏时表现出良好的延性。

Effect of Different Chopped Fibers on Mechanical Properties of Coral Concrete

The influence of the content of different short cut fibers(MPPF,ISF,BF)on the mechanical properties of coral concretes were studied,and combined with its failure pattern was analyzed.The results show that the compressive strength growth rate of fiber coral concrete is fast in the early stage and slow in the later stage.When coral concrete is blended with MPPF and ISF of 1 kg/m^3,2 kg/m^3,and 3 kg/m^3,respectively,the compressive strength,splitting tensile strength and flexural strength of coral concrete are increased compared with those of blank group.Compared with ISF,MPPF can improve the mechanical properties of coral concrete more significantly and the optimal MPPF content is 2 kg/m^3.When BF is added into coral concrete,the mechanical properties of coral concrete are reduced.Adding fiber can improve the brittleness of concrete and make it show good ductility when it is broken.