Ternary blends containing slag and interground/blended limestone: Hydration, strength, and pore structure
Ternary blends containing slag and interground/blended limestone: Hydration, strength, and pore structure
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DOI：
10.1016/j.conbuildmat.2015.10.179
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发表时间：
2016-01-15
影响因子：
7.4
通讯作者：
Neithalath, Narayanan
中科院分区：
文献类型：
--
作者：
Arora, Aashay;Sant, Gaurav;Neithalath, Narayanan
本文报道了用矿渣和石灰石复合取代大掺量水泥对胶凝体系的水化、反应产物、孔结构和强度的影响。总更新量从20%到50%不等。矿渣与：(I)含有石灰石与水泥夹层的波特兰-石灰石水泥(PLC)，或(Ii)OPC和四种不同尺寸的石灰石，以使得到的复合材料的颗粒分布与相应的基于PLC的混合物的颗粒分布相匹配。在石灰石的存在下，水泥和水泥-矿渣混合料的水化反应被改变。量热和热重分析表明，矿渣-石灰石具有良好的协同作用，可以大量替代水泥而不会造成性能损失。石灰石的存在有益地影响了早期抗压强度，而熟料因素在混合体系和中间体系中对后期抗压强度没有显着影响。这项研究为多材料粘结剂的开发铺平了道路，这些粘结剂含有更高水平的水泥替代，表现出与传统直接水泥系统相当或更好的早期和晚龄期性能。(C)2015爱思唯尔有限公司。保留所有权利。
The influence of high volume cement replacement using a combination of slag and limestone, on the hydration, reaction products and pore structure, and strength of cementitious systems is reported in this paper. Total replacement levels vary from 20% to 50% by volume. Slag is blended with: (i) Portland-limestone cement (PLC) that contains limestone interground with cement, or (ii) OPC and limestone of four different sizes in such a way that the resulting particle size distribution of the composite matches that of the corresponding PLC-based mixture. The hydration response of cement and cement-slag mixtures are found to be modified in the presence of limestone. It is observed from calorimetric and thermogravimetric analysis that a favorable slag-limestone synergy exists, that enables high volume replacement of cement without concomitant loss in properties. The early-age compressive strengths are beneficially impacted by the presence of limestone whereas the clinker factor does not play a significant role in later-age strengths in both the blended and interground systems. The study paves the way for development of multiple-material binders containing higher levels of cement replacement that demonstrate early and later age properties that are comparable to or better than that of traditional straight cement systems. (C) 2015 Elsevier Ltd. All rights reserved.