Mechanical Strength and Microstructure Analysis of Cementitious Wheat Straw Composite

Abstract:

Wheat straw alkali treatment has impacts on the strength of cement mortar and glazed hollow beads insulation mortar. The results show that the bending strength and bending strength of cement mortar specimen with 4% wheat straw are respectively 58.3% and 40.9% of the benchmark specimen, but bending-press ratio of the latter is 1.42 times of the former. The SEM images reflect the straws influences on the cement hydrate morphology, status and the influence of the number on cement mortar and glazed hollow beads insulation mortar. Compared with the latter, the former C-S-H gel is loose fibrous, failure to form a good network. In the thermal insulation mortar consistency and stratification of the same circumstances, with straw dosage increased, strength first increases, then declining. And folding pressure than in straw dosage is less than 24% more ideal. The SEM pictures show that network C-S-H gel decrease and loose fibrous C-S-H gel increased. At the same time, AFt gradually become attenuate and curly.

• Periodical: Applied Mechanics and Materials (Volumes 357-360)
• Pages: 766-772
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.357-360.766
• Online since: August 2013
• Authors: Lin Zhang, Fu Sheng Liu, Ji Yong Song, Yan Bin Zhang, Gang Gang Dong
• Keywords: Alkali Treated Wheat Straw, Cement Base Material, Glazed Hollow Beads Insulation Mortar, SEM Microstructure

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