Xie Yuxiang, Zhang Zixuan, Chen Yujie, Ren Xu, Liu Yuan, Tao Jia, Liu Runxia, Li Min, Li Ziwei
Guizhou Provincial Key Laboratory of Green Chemical and Clean Energy Technology, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China.
North Alabama International College of Engineering and Technology, Guizhou University, Guiyang 550025, China.
Polymers (Basel). 2024 Nov 24;16(23):3272. doi: 10.3390/polym16233272.
To tackle high viscosity in fresh concretes, especially high-performance concrete, the research of polycarboxylate superplasticizers (PCEs) is relevant. By designing the molecular structure of PCEs, problems such as pumping difficulties in high viscosity of high-performance concrete can be solved. Therefore, in this paper, a suite of novel viscosity reducing PCEs containing sulfonic acid groups and different acrylate densities were synthesized on the basis of inventive molecular structure design, and characterized to determine the predicted structure. The maximum adsorption, the best fluidity, and the Minimum zeta potential value can be seen for PCEs with a small number of ester groups (PCE-MA0.5) due to the combination of the rigidity of its backbone and the density of the adsorption groups. Moreover, the investigation of working mechanism showed the introduction of ester groups can significantly reduce viscosity, but also reduces the adsorption capacity. This research aims to propose a feasible method for synthesizing PCE with superior processability and viscosity reduction capability in cement and concrete.
为解决新拌混凝土尤其是高性能混凝土的高粘度问题，聚羧酸系高效减水剂（PCEs）的研究具有重要意义。通过设计PCEs的分子结构，可以解决高性能混凝土高粘度导致的泵送困难等问题。因此，本文基于创新的分子结构设计，合成了一系列含磺酸基团和不同丙烯酸酯密度的新型降粘PCEs，并对其进行表征以确定预测结构。由于主链刚性和吸附基团密度的结合，酯基数量少的PCEs（PCE-MA0.5）表现出最大吸附量、最佳流动性和最小ζ电位值。此外，作用机理研究表明，酯基的引入能显著降低粘度，但也会降低吸附能力。本研究旨在提出一种在水泥和混凝土中合成具有优异加工性能和降粘能力的PCE的可行方法。
