Effect of Freezing-Thawing on Clayey Soils Reinforced with Human Hair Fibers

ABSTRACT

The reinforcing of fine-grained soils using natural or synthetic fibers has been successfully applied today. The use of waste human hair fibers among natural fibers is seen as a sustainable solution as a reinforcing material. A series of free pressure tests were performed before and after the freezing-thawing cycle in order to examine the strength properties of the clayey soil (CS) reinforced with human hair fibers (HHF). Before freezing-thawing, clayey soil samples prepared with four different mass ratios of human hair fibers (0.5%, 1%, 1.5%, and 2% by dry weight) indicated 14–54% increases in strength, 7–49% increase were obtained after freezing-thawing. The highest strength increases before and after the freezing-thawing cycle has occurred in the mixture of CS+1.5% HHF. In addition, it was determined that the increase in pressure stress is remarkably increases with increasing human hair fiber ratio and cure time and freeze-thaw cycles. As a result, it is concluded that the CS reinforced with HHF can be utilized in cold climate zones.

摘要

利用天然纤维或合成纤维对细粒土进行加固已在今天得到成功应用在天然纤维中使用废弃的人发纤维被视为一种可持续的增强材料在冻融循环前后进行了一系列的自由压力试验，以研究人发纤维（HHF）加固粘性土（CS）的强度特性冻融前，用4种不同质量比的人发纤维（干重分别为0.5%、1%、1.5%和2%）制备的粘质土样，强度提高14-54%，冻融后强度提高7-49%CS+1.5%HHF的混合物在冻融循环前后强度最高此外，还发现随着人发纤维比例的增加、固化时间的延长和冻融周期的延长，压力应力的增加明显增加结果表明，HHF增强碳纤维可以应用于寒冷地区.

KEYWORDS:

• Clay
• human hair fiber
• freeze-thaw
• strength
• XRD
• SEM

关键词:

• 粘土
• 人发纤维
• 冻融
• 强度