文献类型：期刊文献

英文题名：Chloride diffusion and binding capacity of sustainable cementitious materials with construction waste powder as cement replacement

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

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]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China

年份：2023

卷号：368

外文期刊名：CONSTRUCTION AND BUILDING MATERIALS

收录：SCI-EXPANDED(收录号：WOS:000920270400001)、、EI(收录号：20230413417636)、Scopus(收录号：2-s2.0-85146438289)、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：Construction waste powder; Sustainable cementitious materials; Chloride diffusion; Chloride binding capacity

外文摘要：Reusing construction waste powder (CWP) for sustainable cementitious materials is an effective method to reduce the amount of construction waste, and the CWP blended cementitious materials has been applied in construction engineering at a large scale and is inevitably exposed to a chloride attack environment. Therefore, this work studied the chloride diffusion and chloride binding capacity of cementitious materials incorporating CWP. The addition of CWP enlarged the pore diameter and porosity of blended paste, but mixing active admixture can refine the pore structure of CWP mixed paste. Incorporating CWP reduced the compressive strength and elevated total porosity of blended mortar, while the mix of active admixture improved the compressive strength and reduced the total porosity of CWP mortar. The chloride diffusion of mortar was elevated as CWP replacement rate and particle size increased, and the free chloride concentration increased but chloride diffusion coefficient decreased as chloride exposure time was prolonged. Mixing both CWP and silica fume or metakaolin could prepare sustainable mortar with a similar chloride resistance to plain mortar. The total chloride concentration of mortar was elevated as CWP was incorporated, whereas the chloride binding capacity reduced with the growth of CWP substitution rate. When CWP replacement percentage was identical, the mortar with CWP ground from cement paste waste had better chloride binding capacity than the mortar with CWP ground from mortar and concrete waste. Through optimizing CWP replacement and active admixture content, good strength and chloride resistance can be guaranteed in CWP blended cementitious materials.