文献类型：期刊文献

英文题名：Drying shrinkage, mechanical and transport properties of sustainable mortar with both recycled aggregate and powder from concrete waste

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

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

年份：2022

卷号：49

外文期刊名：JOURNAL OF BUILDING ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:000776717500004)、、EI(收录号：20220411491681)、Scopus(收录号：2-s2.0-85123000306)、WOS

基金：Acknowledgments 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：Sustainable mortar; Waste concrete recycling; Recycled aggregate; Recycled fine powder; Properties modification

外文摘要：Utilizing recycled fine aggregate (RFA) and recycled fine powder (RFP) both from concrete waste to prepare fully recycled mortar benefits the recycling of construction waste. This investigation focused on the performance and modification of recycled mortar with both RFA and RFP, and the properties were obtained by micro- and macromeasurements. The results show that RFA contains abundant hardened cement mortar and has water absorption higher than natural aggregate, and that substituting RFP for 30% cement results in the reduction of hydration products and an increase of pore structure. Incorporating RFA increases the drying shrinkage of newly-prepared mortar, while the appropriate addition of RFP made from mortar and concrete waste reduces the drying shrinkage. Utilizing RFA and RFP are both detrimental to the mechanical strength and permeability resistance, and the performance degeneration of sustainable mortar is significant when high-volume RFA and RFP are incorporated. A linear relationship exists between the total porosity and transport properties of sustainable mortar with RFA and RFP. Substituting active mineral admixtures for a portion of RFP benefits the properties of fully recycled mortar with RFA and RFP; specifically, the addition of 10% silica fume or 10% metakaolin increases the mechanical strength by 35.9% and 38.1% and leads to decreases of 31.4% and 48.4% in the capillary absorption coefficient of fully recycled mortar, respectively. In addition, it is also beneficial for the properties of such sustainable mortar to add a mixture of RFP and recycled clay brick powder, which are both derived from construction waste.