Deng Zuiliang, Lu Guimin, Fu Lefeng, Wang Weishan, Zheng Baicun
School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China.
Technical Center, Shanghai Sunrise Polymer Material Co., Ltd., Shanghai 200231, China.
Materials (Basel). 2021 May 22;14(11):2736. doi: 10.3390/ma14112736.
The aim of this paper is to study the adsorption behavior of polycarboxylate superplasticizers (PCE) on coarse aggregates with a property of high water consumption (above 2%). The coarse aggregates were ground into a powder to create large bibulous stone powder, and it was observed that significant amounts of the ether-based PCE were absorbed onto large bibulous stone powder. The adsorption rate immediately reached a maximum after 5 min and then gradually decreased until an equilibrium absorption was established after 30 min. Zeta potential, infrared spectroscopy, and thermogravimetric analysis (TGA) measurements confirmed that the polycarboxylate superplasticizer adsorbed on the surface of the stone powder. Hydrodynamic diameter measurements showed that the polycarboxylate superplasticizer molecules were smaller than pore size, and the surface area and pore volume were reduced by the polymer incorporation in the pores.
本文旨在研究聚羧酸系高效减水剂（PCE）在具有高吸水率（超过2%）的粗集料上的吸附行为。将粗集料研磨成粉末以制备大吸水率的石粉，观察到大量醚基PCE被吸附到大吸水率石粉上。吸附速率在5分钟后立即达到最大值，然后逐渐降低，直至30分钟后达到平衡吸附。zeta电位、红外光谱和热重分析（TGA）测量证实聚羧酸系高效减水剂吸附在石粉表面。流体动力学直径测量表明，聚羧酸系高效减水剂分子小于孔径，并且聚合物掺入孔中会降低表面积和孔体积。
