Effect of Fly Ash and Reactive MgO on the Engineering Properties and Durability of High-Performance Concrete Produced with Alkali-Activated Slag and Recycled Aggregate
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 11
Abstract
This study investigated the engineering properties and durability of high-performance recycled aggregate concrete (HPRAC) specimens. The specimens were prepared using alkali-activated slag with varying proportions of fly ash (FA) (Category 1) and reactive MgO (Category 2). The first category included specimens in four subcategories in which FA replaced ground granulated blast furnace slag (GGBFS) in the binder at ratios of 0%, 15%, 30%, and 45% by weight. The second category included specimens in three categories in which a group mixture containing 15% FA and 85% GGBFS was modified by 2.5%, 5%, and 7.5% reactive MgO (based on the total weight of FA and GGBFS). The engineering properties of HPRAC specimens were assessed using tests for slump, compressive strength, splitting tensile strength, water absorption test, ultrasonic pulse velocity (UPV), electrical surface resistivity (ESR), thermal conductivity, and rapid chloride ion penetration (RCPT). All the HPRAC specimens exhibited good strength and durability at 91 days of curing. However, the engineering properties of the concrete samples were significantly affected by the levels of added FA and MgO. Although the CF15M5 mixture exhibited the highest compressive strength and best attributes of the HPRAC specimens, its performance in terms of the tested variables still was inferior to that of natural aggregate concrete.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This research was conducted at the Construction Material Research Laboratory (CMRL) of the National Taiwan University of Science and Technology (NTUST) with valuable support from the Taiwan Building Technology Center, Ministry of Science and Technology (MOST), Ministry of Education (MOE), and Hwang’s Research Group.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 11 • November 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Nov 16, 2019
Accepted: Apr 29, 2020
Published online: Aug 23, 2020
Published in print: Nov 1, 2020
Discussion open until: Jan 23, 2021
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