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The "greenness" of High-Volume Fly Ash (HVFA) concrete when exposed to carbonation



Title: The "greenness" of High-Volume Fly Ash (HVFA) concrete when exposed to carbonation
Author(s): P. Van den Heede, N. De Belie
Paper category : conference
Book title: International RILEM Conference on Advances in Construction Materials Through Science and Engineering
Editor(s): Christopher Leung and K.T. WAN
ISBN: 978-2-35158-116-2
e-ISBN: 978-2-35158-117-9
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 1023 - 1029
Total Pages: 7
Nb references: 13
Language: English


Abstract: With at least 50 % of the cement replaced with fly ash, the environmental benefit of High-Volume Fly Ash concrete is seemingly obvious. However, a correct evaluation of this “greenness” requires a full strength and durability assessment followed by life cycle assessment. Two exposure classes were considered: a dry (XC1) and a cyclic wet and dry (XC4) environment with carbonation. A full probabilistic service life prediction based on accelerated carbonation testing, shows that corrosion will not be a problem in both environments after 50 years if the concrete was cured at high relative humidity for at least 28 days. An environmental benefit of about 20 % can be obtained for an axially loaded HVFA column in a XC1 environment. For exposure class XC4, there is no benefit, because of the HVFA mixture‟s considerably lower strength in comparison with the reference for that environment.


Online publication: 2011-10-31
Publication type : full_text
Public price (Euros): 0.00


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