文献类型：期刊文献

英文题名：Water transport and resistance improvement for the cementitious composites with eco-friendly powder from various concrete wastes

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

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：2021

卷号：290

外文期刊名：CONSTRUCTION AND BUILDING MATERIALS

收录：SCI-EXPANDED(收录号：WOS:000659378300005)、、EI(收录号：20211710255482)、Scopus(收录号：2-s2.0-85104597762)、WOS

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

语种：英文

外文关键词：Concrete waste recycling; Recycled powder; Micro-properties characterization; Water absorption; Properties improvement

外文摘要：The water transport properties of cementitious composites are the key parameters to evaluate the durability performance. This work gives an investigation on the impact of RP type, substitution rate and particle size on the water transport in cementitious composites, and the feasible methods of improving the water transport resistance are further investigated. Utilizing recycled paste powder (RPP), recycled mortar powder (RMP) and recycled concrete powder (RCP) produced from various concrete waste is detrimental to the hydration reaction and pore structure of cementitious composites, and the total porosity of paste incorporating 30% various RPs is 35.4-36.0% higher than that of plain paste. Utilizing RP decreases the compressive strength of cementitious composites, and a significant reduction in compressive strength occurs when RP substitution rate is 50%. The water transport in cementitious composites is increased by incorporating RP, and the RMP-prepared and RCP-prepared mortar have lower water absorption than the RPP-prepared mortar; for example, the absorption coefficient of the mortar containing 30% RPP, RMP and RCP is 72.7%, 44.9% and 48.7% greater than that of plain mortar without RP. Besides, the water transport in the mortar incorporating fine particle RP is lower than that in the mortar containing coarse particle RP. Co-mixing RP and mineral admixtures decreases the water transport in cementitious composites, and the mortar incorporating 20% RP and 10% metakaolin (or 10% silica fume) has lower water absorption and slightly higher compressive strength than plain mortar without RP. (c) 2021 Elsevier Ltd. All rights reserved.