Strength development of binary cement concrete, using Pulverized Fly Ash (PFA) under various curing conditions

Document Type : Article

Authors

1 Department of Civil Engineering, City University of Science and IT, Peshawar, Pakistan; and Department of Civil Engineering and Construction, Kingston University, London, UK

2 Department of Civil Engineering, City University of Science and IT, Peshawar, Pakistan

3 Faculty of Science, Engineering and Computing at Kingston University, London, UK.

Abstract

Binary Cement incorporating Supplementary Cementitious Material (SCM) is widely used in concrete to reduce the cement consumption in construction industry. Cement production is a major source for the emission of Green House Gases (GHG) and there is an increasing pressure to reduce its consumption to avoid further Global Warming and Climate changes etc.  In this research, Pulverised Fly Ash was used to partially replace cement in the concrete. Three levels of replacement of cement by PFA were selected and the specimens were cured under summer and winter environments. The strength development characteristics of the blended concrete were compared with the control mix without PFA.  The strength gain under winter curing condition was observed as slower.  At water cement ratio of 0.35, concrete with 30 % replacement of cement by PFA achieved high early age strength. PFA concrete gained more strength than the PC concrete after the age of 28 days. The 28 days compressive strengths of blended concrete for 30 % of cement replacement by PFA has been observed as nearly the same as that of control concrete mix. 

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References

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Scientia Iranica
Volume 26, Issue 2 - Serial Number 2
Transactions on Civil Engineering (A)
March and April 2019
Pages 615-624

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