Study on the Influence of Acrylic-Acid Addition Mode on the Performance of Polycarboxylate Slump-Retaining SuperplasticizersXianxian Yang, Xiujuan Guo, Nianli Qiu, Qiumin Xiong and Xiaobin ChenE3S Web Conf., 686 (2026) 02019DOI: https://doi.org/10.1051/e3sconf/202668602019