Rheology, hydration, and strength evolution of interground limestone cement containing PCE dispersant and high volume supplementary cementitious materials
Rheology, hydration, and strength evolution of interground limestone cement containing PCE dispersant and high volume supplementary cementitious materials
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DOI：
10.1016/j.matdes.2017.04.061
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发表时间：
2017-08
影响因子：
8.4
通讯作者：
I. Mehdipour;Aditya Kumar;K. Khayat
中科院分区：
文献类型：
--
作者：
I. Mehdipour;Aditya Kumar;K. Khayat
本文的目的是阐明波特兰-石灰石水泥（PLC）和大量铝硅酸盐补充胶凝材料（SCMs）制备的混合胶凝体系的基本组成-反应-性能相关性。一项广泛的调查包括协调实验和数值模拟，以量化PLC和SCM（即粉煤灰和矿渣）之间的协同相互作用，并将它们与相应的混合普通波特兰水泥（OPC）体系进行比较。研究了在砂浆中添加最佳剂量的聚羧酸醚（PCE）分散剂以改善流动性并实现增强颗粒堆积。结果表明，尽管在高剂量下加入了PCE，由于PLC系统具有更高的比表面积，因此与OPC系统相比，PLC系统始终表现出更高的水化动力学。与OPC系统相比，scm在提高PLC系统强度方面更有效。PLC系统相对于OPC系统的优势在于增强的颗粒填充和PLC富含碳酸盐的化学性质，从而增强了碳铝酸盐水合物填充空间的形成。此外，将结果整合起来，以建立OPC-SCM和PLC-SCM系统的水化动力学、流变特性和强度演变之间的可靠相关性。这些相关性为优化粘合剂配方和配比提供了见解。
The aim of this paper is to elucidate fundamental composition-reaction-property correlations in blended binder systems prepared with Portland-limestone cement (PLC) and high volume of aluminosilicate supplementary cementitious materials (SCMs). An extensive investigation involving coordinated experiments and numerical simulations was carried out to quantify synergistic interactions between PLC and SCM (i.e., fly ash and slag), and benchmark them against corresponding blended ordinary Portland cement (OPC) systems. The study was carried out on mortars provisioned with optimum dosages of polycarboxylate ether (PCE) dispersant to improve fluidity and achieve enhanced particle packing. The results indicate that in spite of incorporating PCE at high dosages, PLC systems consistently show greater hydration kinetics compared to their OPC counterparts on account of their higher specific surface area. The SCMs are more effective in terms of improving strength in PLC systems as compared to OPC systems. This superiority of the PLC systems over OPC systems is attributed to enhanced particle packing and the carbonate-rich chemistry of PLC which allows enhanced formation of space-filling carboaluminate hydrates. Further, the results are consolidated to develop reliable correlations between hydration kinetics, rheological properties, and strength evolution for OPC-SCM and PLC-SCM systems. These correlations provide insights into optimizing binder formulation and proportioning.