文献类型：期刊文献

英文题名：An innovative ternary composite retarder for α-calcium sulfate hemihydrate towards high workability and robust strength preservation

作者：Lei, Xiaohu[1,2];Chen, Hang[1,2];Song, Xingfu[1,2]

机构：[1]East China Univ Sci & Technol, Engn Res Ctr Resource Proc Engn, Minist Educ, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake Re, Shanghai 200237, Peoples R China

年份：2026

卷号：332

外文期刊名：CHEMICAL ENGINEERING SCIENCE

收录：;EI(收录号：20261820629490);WOS:【SCI-EXPANDED(收录号:WOS:001760643800001)】；

语种：英文

外文关键词：Retardation; Strength; alpha-calcium sulfate hemihydrate; Ternary retarder system; Synergistic mechanism

摘要：To address the challenge of achieving high-efficiency retardation with minimal strength loss in alpha-calcium sulfate hemihydrate (alpha-HH) applications, a novel ternary composite retarder system with a total dosage of less than 0.2 wt% was proposed in this study. Through optimization via response surface methodology, a tunable initial setting time ranging from 60 to 163 min was achieved by this system, while the dry compressive strength loss was controlled within 26.99%. A significant predictive model for performance was also successfully established. The designed UUPR validation group effectively confirmed the model's accuracy, demonstrating initial and final setting times of 62 min and 76 min, respectively. The flexural strength at 1-day (8.770 MPa) and dry compressive strength (44.235 MPa) losses were measured at 15.41% and 14.00%, respectively, essentially meeting the alpha 40 grade requirements. The mechanistic study revealed that the ternary components operate through a synergistic mechanism spanning from chelation-diffusion inhibition to supersaturation-micro-morphology regulation, effectively retarding HH hydration kinetics and promoting the formation of dense crystals. This research provides a viable method for the high-performance application of gypsum-based cementitious materials and offers a novel strategy for the development of high-efficiency retarders.