文献类型：期刊文献

英文题名：Characterization of sustainable mortar containing high-quality recycled manufactured sand crushed from recycled coarse aggregate

作者：Ma, Zhiming[1,3];Shen, Jiaxin[1];Wang, Changqing[2,3];Wu, Huixia[1,4]

机构：[1]Yangzhou Univ, Coll Civil Sci & Engn, Yangzhou 225127, Peoples R China;[2]Shanghai Univ, Dept Civil Engn, Shanghai 200444, Peoples R China;[3]Tongji Univ, Dept Struct Engn, Shanghai 200092, Peoples R China;[4]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China

年份：2022

卷号：132

外文期刊名：CEMENT & CONCRETE COMPOSITES

收录：SCI-EXPANDED(收录号：WOS:000815763100001)、、EI(收录号：20222612269435)、Scopus(收录号：2-s2.0-85132536279)、WOS

基金：The authors gratefully acknowledge substantial support of ongoing projects titled National Natural Science Foundation of China (52008364) and Natural Science Foundation of Jiangsu Province (BK20200957) .

语种：英文

外文关键词：Concrete waste; Recycled manufactured sand; Recycled coarse aggregate; Recycled fine aggregate; Recycled mortar

外文摘要：The current utilization of low-quality recycled fine aggregate sourced from concrete waste acting as river sand replacement cannot achieve the preparation required for high-quality recycled mortar, due to abundant existence of hardened old mortar in recycled fine aggregate. In this work, an innovative and viable approach is proposed to crush recycled coarse aggregate into recycled manufactured sand, which has high-quality properties similar to the manufactured sand crushed from natural stone, for preparing high-quality recycled mortar with high strength and good durability. The results showed that recycled manufactured sand constituted by large proportion of natural stone particles and small proportion of old mortar, owned higher apparent density and lower water absorption than recycled fine aggregate. Incorporating recycled fine aggregate increased the drying shrinkage and decreased the mechanical strength; however, the substitution of natural river sand by recycled manufactured sand in mortar decreased the drying shrinkage as a result of its irregular shape and coarse surface, meanwhile, first increased and then declined the mechanical strength following the increase of the replacing percentage, amongst which the mortar containing 50% recycled manufactured sand showed the best mechanical strength. The tested mortars with recycled manufactured sand showed a general increment in the water and chloride ingress yet exhibited the water absorption and chloride ingress much lower than the mortar with recycled fine aggregate. Particularly, decreasing the content of hardened old mortar in recycled manufactured sand further improved the properties of recycled mortar.