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Macro/micro-pore structure characteristics and the chloride penetration of self-compacting concrete incorporating different types of filler and mineral admixture

Mohammed, Mahmoud khashaa; Dawson, Andrew; Thom, Nicholas

Authors

Mahmoud khashaa Mohammed evxmkm@nottingham.ac.uk

Andrew Dawson

NICK THOM nicholas.thom@nottingham.ac.uk
Assistant Professor



Abstract

The relationship between the internal pore structure features at different scales and the local micro-characteristics of the interfacial transition zone (ITZ) to the non-steady state chloride migration coefficient (Dnssm) is investigated for one normal and three types of sustainable high performance self-compacting concrete mixes. The pore structure classification at different scales and the percolation degrees of the ITZ’s pores were determined using both vacuum-saturated and Mercury Intrusion Porosimetry (MIP) techniques. Further, the local micro-permeation features of the ITZ, such as thickness, porosity and the chemistry of its hydration products is examined using the SEM coupled with the EDX analysis on polished, carbon-coated, flat specimens. Chloride movement was achieved using a modified rapid migration test.

It was deduced that the degree of percolation of the pores of the ITZ had a significant role in controlling the chloride penetration process. Further, it is proposed that the ITZ thickness might be, primarily, responsible in determining the chloride ions’ migration velocity especially when coarse and unreactive filler are used. At nano scale, it is also suggested that the critical pore diameter in the cement matrix is more significant than is the average pore diameter in controlling the chloride resistance in SCC.

Journal Article Type Article
Publication Date Dec 15, 2014
Journal Construction and Building Materials
Print ISSN 0950-0618
Electronic ISSN 1879-0526
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 72
APA6 Citation Mohammed, M. K., Dawson, A., & Thom, N. (2014). Macro/micro-pore structure characteristics and the chloride penetration of self-compacting concrete incorporating different types of filler and mineral admixture. Construction and Building Materials, 72, https://doi.org/10.1016/j.conbuildmat.2014.08.070
DOI https://doi.org/10.1016/j.conbuildmat.2014.08.070
Keywords Chloride penetration, Rapid migration test, Self-compacting concrete, Microstructure, Interfacial transition zone, Cement replacement, Pores percolation
Publisher URL https://doi.org/10.1016/j.conbuildmat.2014.08.070
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Final manuscript-Chloride paper - MS copy.pdf (4 Mb)
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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0



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