Zhu Weiwei, Feng Qingge, Luo Qi, Bai Xiukui, Lin Xianhao, Zhang Zhao
School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China.
School of Materials and Environmental Engineering, Guangxi University for Nationalities, Nanning 530004, China.
Materials (Basel). 2021 Jun 10;14(12):3195. doi: 10.3390/ma14123195.
The effects of polycarboxylate superplasticizers (PCEs) on the dispersing properties and initial hydration of cement particles with various water-to-cement (w/c) ratios was investigated, including the water film thickness (WFT), rheology, fluidity, adsorption of PCEs, zeta potential, degree of hydration, hydration products. The experimental results demonstrate that the initial rheological and fluidity parameters were more sensitive to the PCE dosage at a lower w/c because the WFT and the zeta potential on cement particles change more significantly. Moreover, the higher adsorption amounts of the PCEs at a lower w/c lead to a stronger inhibition of the initial hydration, whilst, at the same PCE dosage, the cement pastes have a more rapid fluidity loss and quicker hydration reactions at a higher w/c due to a lower adsorption amount of the PCE on cement particles.
研究了聚羧酸系高效减水剂（PCEs）对不同水灰比（w/c）水泥颗粒分散性能和初始水化的影响，包括水膜厚度（WFT）、流变学、流动性、PCEs的吸附、ζ电位、水化程度、水化产物。实验结果表明，在较低水灰比下，初始流变学和流动性参数对PCE用量更为敏感，因为水泥颗粒上的水膜厚度和ζ电位变化更为显著。此外，在较低水灰比下PCEs的吸附量较高，导致对初始水化的抑制作用更强，而在相同PCE用量下，由于PCE在水泥颗粒上的吸附量较低，水泥浆体在较高水灰比下流动性损失更快，水化反应更快。
