Degradation mechanisms of natural fiber in the matrix of cement composites

被引:278
作者
Wei, Jianqiang [1 ]
Meyer, Christian [1 ]
机构
[1] Columbia Univ, Dept Civil Engn & Engn Mech, New York, NY 10027 USA
关键词
Degradation; Durability; Blended cement; Fiber reinforcement; SISAL FIBER; PORTLAND-CEMENT; CHEMICAL TREATMENTS; SURFACE-PROPERTIES; VEGETABLE FIBERS; TENSILE BEHAVIOR; AGING MECHANISMS; JUTE FIBERS; DURABILITY; CELLULOSE;
D O I
10.1016/j.cemconres.2015.02.019
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The degradation mechanisms of natural fiber in the alkaline and mineral-rich environment of cement matrix are investigated. Cement hydration is presented to be a crucial factor in understanding fiber degradation behavior by designing a contrast test to embed sisal fibers in pure and metakaolin modified cement matrices. In addition to durability of sisal fiber-reinforced cement composites determined by means of flexural properties, degradation degree of the embedded fibers is directly evaluated by proposing a novel separation approach. The results indicate that, by reducing alkalinity of pore solution, metakaolin effectively mitigates the deterioration of natural fiber. By combining results of thermogravimetric analysis and microstructure, the alkali degradation process of natural fiber, which consists of hydrolysis of lignin and hemicellulose, stripping of cellulose microfibrils and deterioration of amorphous regions in cellulose chains, is visually presented. Two new concepts of mineralization mechanism, calcium hydroxide (CH)-mineralization and self-mineralization, are also proposed and quantitatively characterized. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1 / 16
页数:16
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