Mechanical and durability properties of recycled aggregate concrete with ternary binder system and optimized mix proportion

Babalola, O. E. and Awoyera, P. O. and Tran, M. T. and Le, D. -H. and Olalusi, Oladimeji B. and Viloria, A. and Ovallos-Gazabon, D. (2020) Mechanical and durability properties of recycled aggregate concrete with ternary binder system and optimized mix proportion. Journal of Materials Research and Technology. pp. 6521-6532.

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Abstract

tThis study aimed to investigate the mechanical and durability properties of recycled aggre-gate concrete with a ternary binder system and optimized mix proportion. Two concretebatches were developed using a densified mix design approach (DMDA) to evaluate therequired mix proportions. Batch I have GGBS content varied at 0%, 10%, 20%, 30%, 40% and50% at constant w/b ratio of 0.45, while batch II concrete mix have varied water/binder ratios:0.3, 0.35, 0.4, 0.45 and 0.5 at constant GGBS replacement level of 30%. The fine aggregate(river sand) of the two batches was blended with fly ash at optimum loose packing density(FA + Sand) and superplasticizer (SP) was incorporated in the mix at a constant level of 1.4%.A control mix comprising of natural aggregate was also developed. The results obtainedshowcased the feasibility of producing structural concrete with recycled aggregates usingGGBS and fly ash. The mechanical and durability properties were best at 30% GGBS content and 0.35 water/binder ratio. The DMDA for mix proportion adopted for RAC contributed sig-nificantly to improving its properties when compared to NAC, especially at the optimumobserved RAC mix with compressive strength of 52 MPa. Also, the mix demonstrated goodpermeability resistance in terms of chloride-ion ingress and capillary water absorption.

Item Type:	Article
Uncontrolled Keywords:	Recycled aggregate concreteDensified mix designTernary binderDurabilityMechanical propertiesa
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Engineering, Science and Mathematics > School of Civil Engineering and the Environment
Depositing User:	Mrs Patricia Nwokealisi
Date Deposited:	26 Jan 2021 14:55
Last Modified:	26 Jan 2021 14:55
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/13808

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