Synergistic Potential of Fly Ash in Concrete Featuring Portland-Limestone Cement

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Title: Synergistic Potential of Fly Ash in Concrete Featuring Portland-Limestone Cement

Author(s): Jay Shannon, Isaac L. Howard, V. Tim Cost, and Will Crawley

Publication: Materials Journal

Volume: 114

Issue: 02

Appears on pages(s): 295-306

Keywords: fly ash; limestone; portland-limestone cement; slag cement; supplementary cementitious materials; sustainability

Date: 3/1/2017

Abstract:
Portland-limestone cement (PLC) has recently been found useful in improving concrete’s synergy with some supplementary cementitious materials (SCMs), relative to ordinary portland cement (OPC), and in reducing early-age performance impacts of higher levels of cement replacement with SCMs. Use of PLC extends sustainability benefits by reducing concrete’s carbon footprint via reduced clinker content. This study explores how the performance of concrete using higher cement replacement with SCMs may be improved through use of PLCs in place of traditional OPCs in support of improved sustainability. PLCs were found to be able to enhance strength and setting in mixtures with higher levels of SCM replacement of cement, especially in certain combinations, while maintaining or improving later-age strengths. Results were notably productive in balancing mixture early performance, late-age strengths, and economics, with performance generally improved using PLCs relative to OPCs.