文献类型：期刊文献

英文题名：Micro-structure, mechanical and transport properties of cementitious materials with high-volume waste concrete powder and thermal modification

作者：Wu, Huixia[1,2];Yang, Dingyi[1];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：313

外文期刊名：CONSTRUCTION AND BUILDING MATERIALS

收录：SCI-EXPANDED(收录号：WOS:000718536000002)、、EI(收录号：20214511134871)、Scopus(收录号：2-s2.0-85118581680)、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：Waste concrete recycling; Waste concrete powder; High volume; Properties evaluation; Thermal modification

外文摘要：Utilizing waste concrete powder (WCP) to prepare eco-friendly cementitious materials provides an effective approach to recycling concrete waste, and thus, this work focuses on the properties and modification of sustainable recycled mortar including high-volume WCP. The WCP with an irregular microstructure consists of abundant inert components, while the thermal modification treatment on WCP promotes the formation of new active components. Incorporating untreated WCP decreases the hydration products and increases the pore size, but the thermal modification on WCP benefits the micro-properties of newly-prepared paste. The addition of WCP prolongs the setting time, while the thermal modification on WCP up to 900 degrees C shortens the setting time; besides, the mortar with WCP after 1200 degrees C activation has excellent fluidity and shrinkage resistance. The mechanical strength decreases and water transport increases following the growing substitution rate of WCP, and an obvious degeneration appears as high-volume WCP incorporates. At the identical replacement ratio of WCP, the properties of mortar with 300-900 degrees C thermally-modified WCP are superior to those of mortar including untreated WCP. For instance, the compression strength and capillary absorption coefficient of mortar including 50% WCP after 900 degrees C activation are 26.4% higher and 46.1% lower relative to mortar including untreated WCP. However, there is hardly apparent improvement on the performance of newly-prepared mortar including WCP modified by 1200 degrees C.