The cement dispersion performance of a polycarboxylate (PCE)-based superplasticizer is highly related to their adsorption behaviors as a function of time. This study evaluated effects of PCEs on rheological properties of cementitious materials. First, characteristics of PCEs were characterized via permeation chromatography (GPC) and Fourier-transform infrared spectrometry (FT-IR). The adsorption behavior of single and blended PCEs on cementitious composites was identified using total organic carbon analyzer (TOC). Based on the measurement of PCE adsorption, the changes of rheological properties of cementitious materials as well as the number of dispersed cement particles were characterized using a rheometer and laser spectroscopy, respectively. The experimental results support the systematic mechanism of PCE adsorption, cement dispersion, and the decrease in viscosity of cementitious materials.

聚羧酸盐 (PCE) 基减水剂的水泥分散性能与其随时间的吸附行为高度相关。本研究评估了 PCE 对胶凝材料流变性能的影响。首先，通过渗透色谱 (GPC) 和傅里叶变换红外光谱 (FT-IR) 表征 PCE 的特性。使用总有机碳分析仪 (TOC) 确定了单一和混合 PCE 在水泥复合材料上的吸附行为。在测量 PCE 吸附的基础上，分别使用流变仪和激光光谱仪表征了胶凝材料流变性能的变化以及分散的水泥颗粒数量。实验结果支持了 PCE 吸附、水泥分散、