Synthesis and Evaluation of Geopolymer Mixtures Containing Chronologically Aged Basic Oxygen Furnace Slags

Tukaziban A. Shon C.-S. Zhang D. Kim J.R. Kim J.-H. Chung C.-W.
December 2023 Multidisciplinary Digital Publishing Institute (MDPI)

Sustainability (Switzerland)
2023 #15 Issue 24

Applying industrial by-products as a substitution for conventional construction materials (natural resources) is a superior solution for the environment in terms of waste management and reduction in greenhouse emissions and for the construction industry in terms of cost and expenditure. Applying basic oxygen furnace slag (BOFS), one of the metallurgical industry by-products, as a construction material can be a high-potential and promising idea. However, the utilization of BOFS in construction applications is considerably limited because of its inherent characteristics leading to volumetric expansion behavior caused by the chemical reaction between free lime (f-CaO) and water. This study used geopolymer technology to stabilize the expansive behavior of chronologically aged BOFS aggregates. The compressive strength, expansion behavior, and drying shrinkage characteristics of a normal ordinary Portland cement (OPC) mixture and a geopolymer mixture containing siliceous river sand and chronologically aged BOFS aggregates were investigated. The test results showed that the compressive strength of geopolymer mixtures containing chronologically aged BOFS aggregate achieved 64.02 MPa, and the expansion behavior of geopolymer mixtures was improved compared with normal OPC mixtures containing the same BOFS aggregates, reaching 0.02% and 0.44%, respectively. However, due to the air-curing method, geopolymer mixtures had higher drying shrinkage values than normal OPC mixtures. Therefore, further studies should be conducted to investigate how to control the drying shrinkage of geopolymer mixtures containing chronologically aged BOFS aggregate.

basic oxygen furnace slag , compressive strength , drying shrinkage , expansion , geopolymer

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Department of Civil and Environmental Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Astana, 010000, Kazakhstan
Multidisciplinary Infra-Technology Research Laboratory, Pukyong National University, Busan, 48513, South Korea
Division of Architectural and Fire Protection Engineering, Pukyong National University, Busan, 48513, South Korea

Department of Civil and Environmental Engineering
Multidisciplinary Infra-Technology Research Laboratory
Division of Architectural and Fire Protection Engineering

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