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Materials 2019, 12(8), 1247; https://doi.org/10.3390/ma12081247

Sulfate Resistance of Recycled Aggregate Concrete with GGBS and Fly Ash-Based Geopolymer

1
School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China
2
Division of Engineering, NYU Abu Dhabi, P.O. Box 129188, Abu Dhabi, UAE
3
School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China
*
Author to whom correspondence should be addressed.
Received: 22 March 2019 / Revised: 4 April 2019 / Accepted: 11 April 2019 / Published: 16 April 2019
(This article belongs to the Section Construction and Building Materials)
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Abstract

There is a constant drive for the development of ultra-high-performance concrete using modern green engineering technologies. These concretes have to exhibit enhanced durability and incorporate energy-saving and environment-friendly functions. The object of this work was to develop a green concrete with an improved sulfate resistance. In this new type of concrete, recycled aggregates from construction and demolition (C&D) waste were used as coarse aggregates, and granulated blast furnace slag (GGBS) and fly ash-based geopolymer were used to totally replace the cement in concrete. This study focused on the sulfate resistance of this geopolymer recycled aggregate concrete (GRAC). A series of measurements including compression, X-ray diffraction (XRD), and scanning electron microscopy (SEM) tests were conducted to investigate the physical properties and hydration mechanisms of the GRAC after different exposure cycles in a sulfate environment. The results indicate that the GRAC with a higher content of GGBS had a lower mass loss and a higher residual compressive strength after the sulfate exposure. The proposed GRACs, showing an excellent sulfate resistance, can be used in construction projects in sulfate environments and hence can reduce the need for cement as well as the disposal of C&D wastes. View Full-Text
Keywords: recycled aggregates; geopolymer concrete; sulfate attack; hydration mechanism; ground granulated blast furnace slag; fly ash recycled aggregates; geopolymer concrete; sulfate attack; hydration mechanism; ground granulated blast furnace slag; fly ash
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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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Xie, J.; Zhao, J.; Wang, J.; Wang, C.; Huang, P.; Fang, C. Sulfate Resistance of Recycled Aggregate Concrete with GGBS and Fly Ash-Based Geopolymer. Materials 2019, 12, 1247.

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