文献类型：期刊文献

英文题名：Mechanical, water resistance and environmental benefits of magnesium oxychloride cement incorporating rice husk ash

作者：Nie, Yanfeng[1];Lu, Jingzhou[1];Liu, Zhiyong[1];Meng, Dan[2];He, Zhihai[3];Shi, Jinyan[4]

机构：[1]Yantai Univ, Sch Civil Engn, Yantai 264005, Peoples R China;[2]Nanyang Technol Univ, Sch Civil & Environm Engn, 50 Nanyang Ave, Singapore 639798, Singapore;[3]Shaoxing Univ, Coll Civil Engn, Shaoxing 312000, Peoples R China;[4]Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China

年份：2022

卷号：849

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：SCI-EXPANDED(收录号：WOS:000857121700010)、、EI(收录号：20223412594284)、Scopus(收录号：2-s2.0-85135890594)、WOS

基金：The authors would like to acknowledge Research Fund for Young Doctors of Yantai University and National Natural Science Foundation of China (Grant No. 51978596) and the project "Key projects of Shandong Natural Science Foundation (grant number ZR2020KE049)".

语种：英文

外文关键词：Eco-friendly cement; Magnesium oxychloride cement; Rice husk ash; Water resistance; Microstructure

外文摘要：Magnesium oxychloride cement (MOC) has received extensive attention as an eco-friendly cement, but its poor water resistance limits its engineering applications. In this study, MOC mixture (MOCM) was modified with 10-50 % rice husk ash (RHA) (wt% of MgO), and the development of their fresh properties, mechanical strength and microstructure was investigated. The results show that the incorporation of RHA to MOCM increases the setting time of the mixture and reduces its flowability. Due to the fine particle size and high reactivity of RHA, the incorporation of an appropriate amount of RHA to MOCM improves the matrix compactness, thereby enhancing the compressive strength of the samples. Although the microstructure of MOCM deteriorates and the strength decreases after immersion in water, the strength retention coefficient of MOCM with 50 % RHA increases by 24.57 % compared with that of plain MOCM. The incorporation of RHA not only reduces the relative content of magnesium oxide in MOCM, but also generates Mg-Cl-Si-H gel, which is beneficial to improve the water resistance of MOCM. Meanwhile, with the increase of RHA content, the carbon emission of MOCM also decreases. Compared with other modification methods, RHA-modified MOCM performs better in terms of water resistance, environmental benefits and strength enhancement.