Environmental and Durablility Assessment of Cements with Addition of Coal Bottom Ash

Author(s): E. Menéndez, S.E. Ruiz, and J. de Frutos
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: 125-134
Total Pages: 10
Language : English

Abstract: Bottom ash and fly ash are by-products formed in the coal power plants. The proportion of FA:BA is approximately 80:20. FA and BA have similar chemical composition. But, density, size, and shape are different. FA has a spherical shape and is smaller than 100 μm while BA has angular shape and size in the order of millimetres. In the present work, BA is studied to be used as additive to cement to be valorised and reduce the generation of waste. In the present work, a study of cements with a partial substitution of FA, BA, and FA+BA (15%, 25%, and 35%) is done. In general, a significant reduction in compressive strength is observed with an addition of 35%. An environmental and durable evaluation of the mixes is done. These are studied for carbonation, alkali-silica reaction, external sulfate attack, and freeze-thaw. Also, the migration of ions to the water is analyzed to study the environmental behavior. In general, a good durable and environmental behavior is observed with the addition of BA and BA+FA mixes. However, the mixes with additions are more sensitive to carbonation and frost action.

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