1. Review of the Effects of Supplementary Cementitious Materials and Chemical Additives on the Physical, Mechanical and Durability Properties of Hydraulic Concrete
- Author
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Han-Seung Lee, Hyun-Min Yang, Muralidharan Raghav, Subbiah Karthick, Seung-Yeop Lee, and Taejoon Park
- Subjects
Technology ,Materials science ,Silica fume ,supplementary cementitious materials ,Review ,law.invention ,law ,General Materials Science ,Cement ,Microscopy ,QC120-168.85 ,QH201-278.5 ,reinforcement corrosion ,Pozzolan ,corrosion inhibition ,Engineering (General). Civil engineering (General) ,TK1-9971 ,Portland cement ,chemical additives ,Descriptive and experimental mechanics ,Properties of concrete ,Chemical engineering ,Ground granulated blast-furnace slag ,Fly ash ,special concretes ,Electrical engineering. Electronics. Nuclear engineering ,Cementitious ,TA1-2040 - Abstract
Supplementary cementitious materials (SCMs) and chemical additives (CA) are incorporated to modify the properties of concrete. In this paper, SCMs such as fly ash (FA), ground granulated blast furnace slag (GGBS), silica fume (SF), rice husk ash (RHA), sugarcane bagasse ash (SBA), and tire-derived fuel ash (TDFA) admixed concretes are reviewed. FA (25–30%), GGBS (50–55%), RHA (15–20%), and SBA (15%) are safely used to replace Portland cement. FA requires activation, while GGBS has undergone in situ activation, with other alkalis present in it. The reactive silica in RHA and SBA readily reacts with free Ca(OH)2 in cement matrix, which produces the secondary C-S-H gel and gives strength to the concrete. SF addition involves both physical contribution and chemical action in concrete. TDFA contains 25–30% SiO2 and 30–35% CaO, and is considered a suitable secondary pozzolanic material. In this review, special emphasis is given to the various chemical additives and their role in protecting rebar from corrosion. Specialized concrete for novel applications, namely self-curing, self-healing, superhydrophobic, electromagnetic (EM) wave shielding and self-temperature adjusting concretes, are also discussed.
- Published
- 2021