Shrinkage of Fly Ash Concrete for Different Replacement Levels and Under Different Curing Conditions

Author(s): Mude Hanumananaik and Kolluru V.L. Subramaniam
Paper category: Proceedings
Book title: Proceeding of the 71st RILEM Annual Week & ICACMS 2017
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN:978-2-35158-195-7, 978-2-35158-190-2 (Set)
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 61-70
Total Pages: 10
Language : English

Abstract: Results of a laboratory investigation on strength gain and shrinkage in cement mortars containing class F fly ash at different levels of replacement under different curing regime are presented. The fly ash replacement levels of 30% and 50% by mass of cement are considered and the specimens are moist cured for 1, 3 and 7 days under water and then subjected to drying at a relative humidity of 50%. Both free drying shrinkage and autogenous shrinkage decreased with an increase in the fly ash content. For any moist curing duration, the rate of increase in the total free drying shrinkage after initiation of drying is not altered by the replacement level. There is a higher free drying shrinkage in the fly ash mixes for longer moist curing. The degree of hydration of fly ash is very sensitive to the duration of moist curing, which is related to the strength gain in the mixtures. In mixtures with fly ash replacement of cement, longer moist curing enhances the fly ash hydration, which increases the rate of strength gain and also the drying shrinkage associated with loss of water from the mixture.

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