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Pro113

Coal bottom ash feasibility study to be a new Portland cement constituent



Author(s): Miguel Angel Sanjuán, Esperanza Menéndez, Cristina Argiz, Amparo Moragues
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: 256-265
Total Pages: 10
Language : English


Abstract: Portland cement is a major responsible in global warming and climate change contributing currently about 7% to greenhouse gas emission. New cements with a lower clinker-cement factor are currently under development to help in this environmental and social topic. Coal bottom ash is a by-product, formed together with the coal fly ash produced during the coal combustion, in thermo-electrical power stations. A main difference between both ashes is the quite different grain size among other properties. The aim of this paper is to evaluate the feasibility of ground coal bottom ash as a potential cement constituent. This paper compares both coal ashes from a chemical and durable point of view and estimates the service life of reinforced concrete and other cement-based materials made of coal bottom ash considering the carbonation resistance by means of on-site measurements. Results show that the use of the carbonation models presented in Annex 9 of the Spanish Structural Concrete regulation, EHE-08, gives longer corrosion initiation periods, and then, longer service lives than using the experimental carbonation coefficients. Ground coal bottom ash and coal fly ash mortars perform similarly.


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


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