文献类型：期刊文献

英文题名：Mechanical properties and water absorption of cement composites with various fineness and contents of waste brick powder from C&D waste

作者：Ma, Zhiming[1,3];Tang, Qin[1];Wu, Huixia[1,2];Xu, Jianguang[1];Liang, Chaofeng[2]

机构：[1]Yangzhou Univ, Coll Civil Sci & Engn, Yangzhou 225127, Jiangsu, Peoples R China;[2]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[3]Tongji Univ, Dept Struct Engn, Shanghai 200092, Peoples R China

年份：2020

卷号：114

外文期刊名：CEMENT & CONCRETE COMPOSITES

收录：SCI-EXPANDED(收录号：WOS:000579761600028)、、EI(收录号：20203309059845)、Scopus(收录号：2-s2.0-85089399441)、WOS

基金：The authors gratefully acknowledge the project funded by National Key R&D Program of China 2018YFD1101002 and National Natural Science Foundation of China (51922052, 51778309).

语种：英文

外文关键词：Construction and demolition waste; Waste brick powder (WBP); Fineness and replacement; Mechanical properties; Water absorption

外文摘要：The use of waste brick powder (WBP) as supplementary cementitious material (SCM) provides an effective approach to reclaiming construction and demolition (C&D) waste. This research shows the evolution of preparing eco-friendly mortar with various fineness levels and replacement ratios of WBP from waste brick in C&D waste. Due to the pozzolanic activity and filler effect of WBP, incorporating an appropriate content and fineness of WBP refines the pore network of cementitious materials, while the number of hydration products decreases with WBP addition. With WBP incorporation, the water demand increases and mixture slump decreases, while the use of WBP improves the drying shrinkage resistance. The pozzolanic activity increases with increasing WBP fineness; when the WBP fineness is higher than the cement fineness, the compression strength with WBP contents up to 15% is superior to that without WBP, while the compression strength decreases with WBP incorporation when the WBP fineness is close to or lower than the cement fineness. Incorporating an appropriate WBP content decreases the water absorption of mortar, and the water absorption further decreases with increasing WBP fineness; for example, when the median diameter of WBP is 6 mu m and 42 mu m, the capillary absorption coefficient of mortar with 30% WBP is 34.1% lower and 10.3% higher than that of plain mortar, respectively. In addition, a similar conclusion is observed for the water distribution in WBP mortar.