Permeability of ambient cured fly ash geopolymer concrete blended with additives

Author(s): Pradip Nath, Prabir Sarker
Paper category: Proceedings
Book title: Proceedings of the International RILEM Conference
Materials, Systems and Structures in Civil Engineering 2016
Segment on Concrete with Supplementary Cementitious Materials
Editor(s): Ole M. Jensen, Konstantin Kovler and Nele De Belie
ISBN:978-2-35158-178-0
e-ISBN: 978-2-35158-179-7
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 406-415
Total Pages: 10
Language : English

Abstract: Fly ash geopolymer concrete is a low-emission alternative building material to ordinary Portland cement (OPC) concrete. Previous studies mostly reported the properties of heat cured geopolymer concrete. However, heat curing is a costly and energy-intensive process which is not always feasible for cast-in-situ concreting. This study presents the effects of different mixture parameters on the permeability properties of geopolymer concrete cured in ambient condition. Low-calcium fly ash was blended with small percentages of additives such as blast furnace slag, OPC and hydrated lime in order to enhance setting and overcome the need for heat curing. The results of different mixtures were compared with those of control geopolymer and OPC concrete. The results of ambient cured geopolymer samples were also compared with those of heat cured samples. It was found that the volume of permeable voids (VPV) of geopolymers modified with different additives remained unaffected, despite achieving higher strength as compared to the control concrete. Sorptivity of the mixtures depended on the type and amount of the additives present in the mixture. The results show suitability of the fly ash blends for ambient-cured geopolymer concrete of strength and permeability similar to those of OPC concrete and heat-cured geopolymer concrete.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00