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Influence of pretreatment of rice straw on hydration of straw fiber filled cement based composites
HighlightsEffect of pretreatment of straw fiber on the fiber characteristics was investigated.Different kinds of straw fibers filled cement based composites were studied.Pretreatment of straw fiber eliminate amorphous hemicellulose and lignin.The pretreated rice straw fibers had less influence on the hydration of cement.
AbstractThe morphological and structural characteristics of four different fibers, the pristine rice straw (RF1) and three fibrous materials (RF2, RF3 and RF4) during the components separating process from rice straw, were investigated. The results indicated the pretreatment of rice straw could eliminate amorphous hemicellulose and lignin, increase the crystallinity and improve the thermal stability of rice straw fiber. Additionally, the effect of four kinds of straw fibers on hydration of the straw fiber filled cement based composites were studied using isothermal calorimetry, X-ray diffraction (XRD) and thermogravimetry (TGA) techniques. For this purpose, the composites containing 10wt.% of the pristine and the pretreated rice straw fiber were prepared. As a result, the presence of both the pristine and the pretreated rice straw fiber delays and inhibits the hydration of cement. The composites containing RF1 showed the lowest rate of heat of hydration (almost 0mW) and sustained the cumulative heat (7.9J) compared to the composites containing RF2, RF3 and RF4 (240.1, 318.2 and 317.1J, respectively) in the first 7days. However, the cumulative heat of the composites with the pretreated rice straw fibers was still lower than the control cement paste (334.2J). The XRD and TGA results revealed that the amount of calcium hydroxide is lower in the composites containing rice straw than in neat cement. This study recommends that the pretreated rice straw fibers had less influence on the hydration of cement.
Influence of pretreatment of rice straw on hydration of straw fiber filled cement based composites
HighlightsEffect of pretreatment of straw fiber on the fiber characteristics was investigated.Different kinds of straw fibers filled cement based composites were studied.Pretreatment of straw fiber eliminate amorphous hemicellulose and lignin.The pretreated rice straw fibers had less influence on the hydration of cement.
AbstractThe morphological and structural characteristics of four different fibers, the pristine rice straw (RF1) and three fibrous materials (RF2, RF3 and RF4) during the components separating process from rice straw, were investigated. The results indicated the pretreatment of rice straw could eliminate amorphous hemicellulose and lignin, increase the crystallinity and improve the thermal stability of rice straw fiber. Additionally, the effect of four kinds of straw fibers on hydration of the straw fiber filled cement based composites were studied using isothermal calorimetry, X-ray diffraction (XRD) and thermogravimetry (TGA) techniques. For this purpose, the composites containing 10wt.% of the pristine and the pretreated rice straw fiber were prepared. As a result, the presence of both the pristine and the pretreated rice straw fiber delays and inhibits the hydration of cement. The composites containing RF1 showed the lowest rate of heat of hydration (almost 0mW) and sustained the cumulative heat (7.9J) compared to the composites containing RF2, RF3 and RF4 (240.1, 318.2 and 317.1J, respectively) in the first 7days. However, the cumulative heat of the composites with the pretreated rice straw fibers was still lower than the control cement paste (334.2J). The XRD and TGA results revealed that the amount of calcium hydroxide is lower in the composites containing rice straw than in neat cement. This study recommends that the pretreated rice straw fibers had less influence on the hydration of cement.
Influence of pretreatment of rice straw on hydration of straw fiber filled cement based composites
Xie, Xiaoli (author) / Gou, Guangjun (author) / Wei, Xiao (author) / Zhou, Zuowan (author) / Jiang, Man (author) / Xu, Xiaoling (author) / Wang, Zeyong (author) / Hui, David (author)
Construction and Building Materials ; 113 ; 449-455
2016-03-17
7 pages
Article (Journal)
Electronic Resource
English
Influence of pretreatment of rice straw on hydration of straw fiber filled cement based composites
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Influence of pretreatment of rice straw on hydration of straw fiber filled cement based composites
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