The effect of random porosity field on supercritical carbonation of cement-based materials

Yu, Min and Bao, Hao and Ye, Jianqiao and Chi, Yin (2017) The effect of random porosity field on supercritical carbonation of cement-based materials. Construction and Building Materials, 146. pp. 144-155. ISSN 0950-0618

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Abstract

In this paper, the supercritical carbonation process of cement-based materials is modelled by introducing a random porosity field to simulate the heterogeneous geometry of the carbonation profile. The suitability of two different random fields of porosity, based on the probability density function (PDF) and the ellipsoidal autocorrelation function (EAF) methods, are investigated, respectively, in simulating the distribution of porosity in cement mortar. After incorporating the above random fields into an established supercritical carbonation model, it is found that with some modifications, the EAF method with consideration of spatial correlation produces better simulation of the irregularities of the carbonation zones that have been observed from experimental results. It is also found that for given average porosity and coefficient of variation, the predicted average and maximum carbonation depths have much smaller coefficients of variation. The validated EAF supercritical carbonation model is then used in parametric studies that are conducted to assess the effect of various factors on the carbonation depth of the chemical process.

Item Type:
Journal Article
Journal or Publication Title:
Construction and Building Materials
Additional Information:
This is the author’s version of a work that was accepted for publication in Construction and Building Materials. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Construction and Building Materials, 146, 2017 DOI: 10.1016/j.conbuildmat.2017.04.060
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2500
Subjects:
ID Code:
85940
Deposited By:
Deposited On:
02 May 2017 14:36
Refereed?:
Yes
Published?:
Published
Last Modified:
19 Sep 2020 04:34