Journal
JOURNAL OF CLEANER PRODUCTION
Volume 348, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2022.131374
Keywords
Cow dung fiber; Cementitious composites; Alkali pretreatment; Splitting tensile strength; Autogenous shrinkage
Categories
Funding
- Natural Science Foundation of Fujian Province [2019J01235]
- Natural Science Foundation of China [51978171]
- Minjiang Scholar program of Fujian province, China [GXRC-19045]
- Key Laboratory of Advanced Civil Engineering Materials (Tongji University) , Ministry of Education [202102]
- Talent-Introduction Program of Fuzhou University [GXRC-19023]
- Natural Science Foundation of Fujian Province, China [2020J01482]
- Fuz-hou University Testing Fund of precious apparatus [2020T032]
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In this study, cow dung was processed into cheap renewable cow dung fiber (CDF) and applied in cementitious composites. The alkali pretreatment of CDF enhanced its crystallinity and significantly increased the strength of the composites. The presence of CDF inhibited the autogenous shrinkage of the cementitious paste. This work is expected to promote the recycling of cow dung waste in sustainable building materials.
The proper disposal of cow dung waste has always been a great challenge for the agricultural sector in China and around the world. In this work, the cow dung was processed into a cheap renewable cow dung fiber (CDF) and applied into cementitious composites. The physicochemical properties of raw and alkali pretreated CDF were analyzed by thermogravimetry, Fourier transform infrared spectroscopy, X-ray diffraction, single fiber tensile test and scanning electron microscopy. The strength and autogenous shrinkage of cementitious composites reinforced with the CDF were measured. The results showed that alkali pretreatment dissolved the amorphous components (i.e., hemicellulose and lignin) and enhanced the crystallinity of cellulose. The pretreatment of CDF by 1 mol/L NaOH solution led the 3 d & PRIME;s compressive and splitting tensile strength of the CDF reinforced cementitious composites to increase by 21.8% and 12.5%, respectively. The presence of CDF, with or without pretreatment enabled to inhibit the development of autogenous shrinkage of cementitious paste. This work is expected to promote an alternative application for the recycling of cow dung waste in sustainable building materials.
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