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Establishment of a preconditioning regime for air permeability and sorptivity of alkali-activated slag concrete

Yang, Kai, Yang, Changhui, Magee, Bryan, Nanukuttan, Sreejith and Ye, Jianxiong (2016) Establishment of a preconditioning regime for air permeability and sorptivity of alkali-activated slag concrete. Cement and Concrete Composites, 73 . pp. 19-28. [Journal article]

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URL: http://dx.doi.org/10.1016/j.cemconcomp.2016.06.019

DOI: 10.1016/j.cemconcomp.2016.06.019

Abstract

This study reports an experimental investigation designed to assess the influence of near-surfacemoisture contents on permeation properties of alkali-activated slag concrete (AASC). Five differentdrying periods (5, 10, 15, 20 and 25 days) and three AASC and normal concretes with compressivestrength grades ranging from C30 to C60 were considered. Assessment of moisture distribution was achieved using 100 mm diameter cores with drilled cavities. Results indicate that air permeability of AASC is very sensitive to the moisture content and its spatial distribution, especially at relative humidity above 65%. To control the influence of moisture on permeation testing, the recommendation of this paper is that AASC specimens should be dried in controlled conditions at 40 C for 10 days prior to testing. It was also concluded from this study that AASC tends to perform less well, in terms of air permeability and sorptivity, than normal concrete for a given strength grade. This conclusion reinforces the need to further examine AASC properties prior to its widespread practical use.

Item Type:Journal article
Keywords:Alkali-activated slag concrete Relative humidity Sorptivity Porosity Air permeability
Faculties and Schools:Faculty of Art, Design and the Built Environment
Faculty of Art, Design and the Built Environment > School of the Built Environment
Research Institutes and Groups:Built Environment Research Institute
Built Environment Research Institute > Studies Allied to Built Environment Research (SABER)
ID Code:36902
Deposited By: Dr Bryan Magee
Deposited On:15 Feb 2017 13:08
Last Modified:01 Jul 2018 22:23

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