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A Study on Residual Strengths of Geopolymer and Portland Cement Based Mortars after Exposure to High Temperatures

Author(s): Prof. R Jeyalakshmi, Rajamane N. P, Namitha Lekshmi J and Baskara Sundararaj J
Paper category: Proceeding
Book title: International Conference on Advances in Civil Engineering and Sustainable Construction
Editor(s): T.Ch. Madhavi, G. Prabhakar, Santhosh Ram, and P.M. Rameshwaran
Print-ISBN: None
e-ISBN: 978-2-35158-161-2
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 218-221
Total Pages : 4
Language : English

Abstract: Geopolymer is a new binder based on aluminosilicate inorganic polymer produced from alkaline activation of powdery materials containing alumina and silica as part of their chemical composition. The literature often reports that the geopolymer binder is commonly having Metakaolin (MK) as a source material and it is high temperature resistant. Portland cement based composites are however reported to be adversely affected by exposure to very high temperatures, say beyond 2000C. Recently, Fly Ash (FA) and Ground Granulated Blast Furnace Slag (GGBS) have been used as geopolymer source materials to produce geopolymeric binders which can be used for the production of various grades of structural concretes. They are reported to be similar or often superior in performances related to : strength, resistance to sulphate and acid attack, bond strength with steel reinforcement bars, corrosion protection of embedded steel reinforcement and structurallybehaviour in flexure and axial loads when R.C.C structural elements are made of them. However, the resistance of these new concretes to elevated temperatures needs to be also studied for their wider applications and this aspect was considered in the investigations discussed in the present paper. Test data shows that though the Portland cement (P-C) and geopolymer (GP) mortars start with similar strength at room temperatures, they start losing their strengths at higher temperatures especially at 4000C and above. The residual strength after exposure to 800oC was about 50% more in geopolymer mortar as compared to P-C mortar. Thus the geopolymer binder can be considered as superior to Portland cement with regards to performances under elevated temperatures.

Online publication: 2017
Publication type: full_text
Public price (Euros): 0.00

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