稻壳灰与混杂纤维对超高性能混凝土的影响Influence of Rice Husk Ash and Assorted Fibers on Ultra High Performance Concrete
王晓龙
WANG Xiao-long
摘要(Abstract)：
超高性能混凝土(UHPC)具有优异的力学性能、耐久性且能减轻结构自重、降低材料使用量，具有广阔应用前景。但UHPC中大量采用超细硅灰与钢纤维等材料，成本较高。采用稻壳灰替换适量的硅灰，并选用聚丙烯纤维、玄武岩纤维与钢纤维混杂，通过测试UHPC的流动度、抗压强度、抗折强度、起裂强度、起裂挠度以及氯离子扩散系数等，分析稻壳灰与混杂纤维对UHPC的影响。结果表明：稻壳灰是一种性能优良的廉价矿物掺合料，适当比例的稻壳灰取代硅灰能一定程度改善UHPC的流动度，使其力学强度与动态弹性模量增大，提升起裂强度与耐久性，混杂纤维未能使UHPC取得预期的力学强度和耐久性，但对UHPC抗裂性能有所改善。
Ultra high performance concrete(UHPC) has excellent mechanical properties and durability, and can reduce the dead weight of the structure and reduce the amount of materials used, so it has a broad application prospect. However, a lot of materials are used in UHPC such as ultra-fine silica fume and steel fiber,and the cost is high. The rice husk ask is selected to replace an appropriate amount of silica fume, and thepolypropylene fiber, basalt fiber and steel fiber are selected to mix. The influence of rice husk ash and assorted fibers on UHPC is analyzed by testing the fluidity, compressive strength, flexural strength, crack initiation strength, crack initiation deflection and chloride ion diffusion coefficient of UHPC. The results show that rice husk ash is a cheap mineral admixture with excellent performance, the appropriate proportion of which instead of silica fume can improve the fluidity of UHPC to a certain extent, increase its mechanical strength and dynamic elastic modulus, and improve the crack initiation strength and durability. Assorted fibers failed to make UHPC achieve the expected mechanical strength and durability, but improved the crack resistance of UHPC.
关键词(KeyWords)：
超高性能混凝土;稻壳灰;聚丙烯纤维;玄武岩纤维
ultra-high performance concrete;rice husk ash;polypropylene fiber;basalt fiber
基金项目(Foundation):
作者(Author):
王晓龙
WANG Xiao-long
DOI: 10.16090/j.cnki.hcxw.2022.11.023
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