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Materials 2015, 8(11), 7309-7321; doi:10.3390/ma8115383

Mechanical Properties and Eco-Efficiency of Steel Fiber Reinforced Alkali-Activated Slag Concrete

1
Department of Construction Engineering Education, Chungnam National University, Daejeon 34134, Korea
2
Department of Architectural Engineering, Chungnam National University, Daejeon 34134, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 1 October 2015 / Accepted: 27 October 2015 / Published: 30 October 2015
(This article belongs to the Section Advanced Composites)
View Full-Text   |   Download PDF [3430 KB, uploaded 30 October 2015]   |  

Abstract

Conventional concrete production that uses ordinary Portland cement (OPC) as a binder seems unsustainable due to its high energy consumption, natural resource exhaustion and huge carbon dioxide (CO2) emissions. To transform the conventional process of concrete production to a more sustainable process, the replacement of high energy-consumptive PC with new binders such as fly ash and alkali-activated slag (AAS) from available industrial by-products has been recognized as an alternative. This paper investigates the effect of curing conditions and steel fiber inclusion on the compressive and flexural performance of AAS concrete with a specified compressive strength of 40 MPa to evaluate the feasibility of AAS concrete as an alternative to normal concrete for CO2 emission reduction in the concrete industry. Their performances are compared with reference concrete produced using OPC. The eco-efficiency of AAS use for concrete production was also evaluated by binder intensity and CO2 intensity based on the test results and literature data. Test results show that it is possible to produce AAS concrete with compressive and flexural performances comparable to conventional concrete. Wet-curing and steel fiber inclusion improve the mechanical performance of AAS concrete. Also, the utilization of AAS as a sustainable binder can lead to significant CO2 emissions reduction and resources and energy conservation in the concrete industry. View Full-Text
Keywords: alkali-activated slag (AAS); mechanical performance; eco-efficiency; ordinary Portland cement (OPC); sustainable binder alkali-activated slag (AAS); mechanical performance; eco-efficiency; ordinary Portland cement (OPC); sustainable binder
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kim, S.-W.; Jang, S.-J.; Kang, D.-H.; Ahn, K.-L.; Yun, H.-D. Mechanical Properties and Eco-Efficiency of Steel Fiber Reinforced Alkali-Activated Slag Concrete. Materials 2015, 8, 7309-7321.

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