- 目录
- 建筑石膏与胶凝材料
- 首页
冻融循环条件下棉花秸秆纤维水泥土抗压强度劣
作者：吴发红1，孙浩1，刘超1，嵇蔚冰2
（1.盐城工学院，江苏 盐城 224001；2.盐城市建筑设计研究院有限公司，江苏 盐城 224001）
摘要：农作物秸秆纤维作为优良的加筋材料，具有生态环保，价格低廉等优势，在岩土工程中已有一定的应用。研究了冻融循环条件下棉花秸秆纤维水泥土的抗压强度劣化性能，并对机理进行分析。结果表明，养护7 d棉花秸秆纤维水泥土经过15次冻融循环，抗压强度降低了50.03%；养护28 d进行20次冻融循环，抗压强度降低了48.82%；棉花秸秆纤维水泥土强碱环境是造成秸秆纤维降解的原因之一；棉花秸秆纤维降解，导致纤维表面和水泥晶体作用力不断衰减，与土体内部水泥晶体的连接也随之衰减，从而锚固作用下降，造成纤维水泥土强度劣化。
关键词：棉花秸秆纤维；水泥土；劣化；冻融
中图分类号：TU472.3+4 文献标识码：A 文章编号：1001-702X（2018）12-0040-04
Study on the compressive strength deterioration of cotton straw fiber cement soil under the conditions of freeze-thaw cycle
WU Fahong1，SUN Hao1，LIU Chao1，JI Weibing2
（1.Yancheng Institute of Technology，Yancheng 224001，China；
2.Yancheng City Architectural Design Research Institute，Yancheng 224001，China）
Abstract：As a good reinforcement material，crop straw fiber has the advantages of ecological environmental protection，low price and so on. It has been used in geotechnical engineering. The compressive strength deterioration of cotton stalk fiber reinforced soil under freeze-thaw cycles was studied，and the mechanism was analyzed. The results showed the strength of cotton straw fiber cement soil of curing 7 d decreased by 50.03% after 15 cycles，and the strength of cotton straw fiber cement soil of curing 28 d decreased by 48.82% after 20 cycles. The alkali environment of cotton straw fiber cement soil was one of the reasons for the degradation of straw fiber. Due to the degradation of cotton straw fiber，the strength of the surface and cement crystal gradually attenuates, and the connection with the cement crystal inside the soil attenuates，thus the anchorage effect decreases，resulting in the deterioration of the strength of the fiber cement soil.
Key words：cotton straw fiber，reinforced soil，deterioration，freeze-thaw