Transport properties of high-volume fly ash concrete: Capillary water sorption, water sorption under vacuum and gas permeability | Health & Environmental Research Online (HERO)

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Citation
Tags

HERO ID

6877380

Reference Type

Journal Article

Title

Transport properties of high-volume fly ash concrete: Capillary water sorption, water sorption under vacuum and gas permeability

Author(s)

Van Den Heede, P; Gruyaert, E; De Belie, N; ,

Year

2010

Is Peer Reviewed?

Yes

Journal

Cement and Concrete Composites
ISSN: 0958-9465

Publisher

ELSEVIER SCI LTD

Location

OXFORD

Page Numbers

749-756

DOI

10.1016/j.cemconcomp.2010.08.006

Web of Science Id

WOS:000284456600001

Abstract

Studying concrete's resistance to carbonation-induced corrosion usually involves exposing the material to CO(2) for quite some time. To estimate the performance of high-volume fly ash (HVFA) concrete more quickly, two key properties governing this process can be studied, namely water penetrability and gas permeability. With respect to HVFA mixtures optimized for usage in an environment exposed to carbonation with wetting and drying, we adopted the latter approach. This paper presents a full assessment of concrete mixtures with varying fly ash amounts. A 50% fly ash mixture by mass with a binder content of 400 kg/m(3) and a water-to-binder ratio of 0.4 had a lower capillary water uptake (-32.6%), water sorption under vacuum (-10.7%) and gas permeability (-78.9%) than a proper reference normally used in this environment. The fly ash applied had an excellent quality regarding loss on ignition (3.5%) and fineness (19% retained on a 45 mu m sieve). (C) 2010 Elsevier Ltd. All rights reserved.