TY - JOUR
T1 - Hydration and strength development in ternary portland cement blends containing limestone and fly ash or metakaolin
AU - Vance, Kirk
AU - Aguayo, Matthew
AU - Oey, Tandre
AU - Sant, Gaurav
AU - Neithalath, Narayanan
N1 - Funding Information:
The authors gratefully acknowledge the National Science Foundation for the financial support for this research (CMMI 1068985). The materials were provided by U.S. Concrete, OMYA A.G, Headwaters Resources, and Burgess Pigments, and are acknowledged. The first author also acknowledges the Dean’s Fellowship from the Ira A. Fulton Schools of Engineering at Arizona State University (ASU) . This research was conducted in the Laboratory for the Science of Sustainable Infrastructural Materials at Arizona State University (ASU) and the Laboratory for the Chemistry of Construction Materials and the Molecular Instrumentation Center at the University of California Los Angeles (UCLA) . The authors gratefully acknowledge the support that has made these laboratories possible. The contents of this paper reflect the views of the authors who are responsible for the facts and accuracy of the data presented herein, and do not necessarily reflect the views and policies of the funding agency, nor do the contents constitute a standard, specification, or a regulation.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2013
Y1 - 2013
N2 - This paper reports the influence of limestone particle size and the type of (partial) cement replacement material on hydration and the mechanical properties of cement pastes. Limestone powders having median particle sizes of 0.7, 3, and 15 lm, at OPC replacement levels between 0% and 20% (volume basis), and two other replacement materials of differing reactivity (i.e., Class F fly ash or metakaolin) at replacement levels between 0% and 10% (volume basis), are used to proportion ternary binder formulations. Fine limestone accelerates early-age hydration, resulting in comparable or better 1-day compressive strengths, and increased calcium hydroxide (CH) contents as compared to pure cement pastes. The incorporation of metakaolin in conjunction with limestone powder alters the heat release (i.e., kinetic) response significantly. A ternary blend of this nature, with 20% total cement replacement demonstrates the highest 1-day strength and lowest CH content. Thermal analysis reveals distinct peaks corresponding to the formation of the carboaluminate phases after 28 days in the limestone-metakaolin modified pastes, whereas the incorporation of similar levels of fly ash does not change the response markedly. It is shown that the synergistic effects of limestone and metakaolin incorporation results in improved properties at early ages, while maintaining later age properties similar to that of traditional OPC systems.
AB - This paper reports the influence of limestone particle size and the type of (partial) cement replacement material on hydration and the mechanical properties of cement pastes. Limestone powders having median particle sizes of 0.7, 3, and 15 lm, at OPC replacement levels between 0% and 20% (volume basis), and two other replacement materials of differing reactivity (i.e., Class F fly ash or metakaolin) at replacement levels between 0% and 10% (volume basis), are used to proportion ternary binder formulations. Fine limestone accelerates early-age hydration, resulting in comparable or better 1-day compressive strengths, and increased calcium hydroxide (CH) contents as compared to pure cement pastes. The incorporation of metakaolin in conjunction with limestone powder alters the heat release (i.e., kinetic) response significantly. A ternary blend of this nature, with 20% total cement replacement demonstrates the highest 1-day strength and lowest CH content. Thermal analysis reveals distinct peaks corresponding to the formation of the carboaluminate phases after 28 days in the limestone-metakaolin modified pastes, whereas the incorporation of similar levels of fly ash does not change the response markedly. It is shown that the synergistic effects of limestone and metakaolin incorporation results in improved properties at early ages, while maintaining later age properties similar to that of traditional OPC systems.
KW - Carboaluminates
KW - Fly ash
KW - Isothermal calorimetry
KW - Limestone
KW - Metakaolin
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U2 - 10.1016/j.cemconcomp.2013.03.028
DO - 10.1016/j.cemconcomp.2013.03.028
M3 - Article
AN - SCOPUS:84882239620
SN - 0958-9465
VL - 39
SP - 93
EP - 103
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
ER -