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Influence of BOF and GGBFS Based Alkali Activated Materials on the Properties of Porous Concrete

Department of Civil Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 807, Taiwan
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Materials 2019, 12(14), 2214; https://doi.org/10.3390/ma12142214
Received: 12 June 2019 / Revised: 2 July 2019 / Accepted: 8 July 2019 / Published: 10 July 2019
(This article belongs to the Special Issue Concrete and Construction Materials)
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Abstract

In this study, environmentally friendly ground granulated blast furnace slag (GGBFS) based alkali activated materials and basic oxygen furnace slags (BOFs) were used as bonding materials and aggregates, respectively, to produce novel, environmentally friendly GGBFS based porous concrete. Porous concrete with a particle size of 4.75–9.5 mm and 9.5–19.00 mm was used as an aggregate. The “liquid-to-solid ratios” (L/S) variable was set at set at 0.5 and 0.6, and the “percentage of pore filling paste ratio” variable was controlled at 40%, 50%, and 60%. The curing period was set at 28 d, and the relationship between connected porosity and permeability, as well as that between unit weight and the pore filling paste ratio percentage were explored using analysis of variance. The results showed that the porous concrete had a maximum compressive strength of 8.31 MPa. The following results were obtained. An increase in percentage of pore filling paste ratio increased compressive strength. Permeability was measured at 4.67 cm/s and was positively correlated with porosity. An increase in porosity increased permeability, in which porosity was positively correlated with the percentage of pore filling paste ratio. The maximum splitting strength achieved during the 28 d was 1.46 MPa, showing a trend similar to that of compressive strength. View Full-Text
Keywords: basic oxygen furnace slag; porous concrete; ground granulated blast furnace slag based alkali activated materials binder; liquid-to-solid ratio (L/S); pore filling paste ratio basic oxygen furnace slag; porous concrete; ground granulated blast furnace slag based alkali activated materials binder; liquid-to-solid ratio (L/S); pore filling paste ratio
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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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Kuo, W.-T.; Gao, Y.-S.; Juang, C.-U. Influence of BOF and GGBFS Based Alkali Activated Materials on the Properties of Porous Concrete. Materials 2019, 12, 2214.

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