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Microstructural characteristics, porosity and strength development in ceramic-laterized concrete

Awoyera, P.O.; Akinmusuru, J.O.; Dawson, Andrew; Ndambuki, J.M.; Thom, N.H.


P.O. Awoyera

J.O. Akinmusuru

Andrew Dawson

J.M. Ndambuki

Assistant Professor


Interfacial bonding between constituent materials and pore sizes in a concrete matrix are major contributors to enhancing the strength of concrete. In a bid to examine how this phenomenon affects a laterized concrete, this study explored the relationship between the morphological changes, porosity, phase change, compressive, and split tensile strength development in a ceramic-laterized concrete. Varying proportions of ceramic aggregates, sorted from construction and demolition wastes, and lateritic soil were used as substitutes for natural aggregates. Strength properties of the concrete specimens were evaluated after 7, 14, 28 and 91 days curing, but morphological features, using secondary electron mode, were examined only at 7 and 28 days on cured specimens, using Scanning electron microscope (SEM). From all the mixes, selected samples with higher 28 day crushing strength, and the reference mix, were further characterized with more advanced analysis techniques, using the mercury intrusion porosimetry (MIP), thermogravimetric analysis (TGA), X-ray Diffractometer, and SEM (backscatter electron mode-for assessment of the interfacial transition properties between aggregates and paste).
The reference mix yielded higher mechanical properties than the concrete containing secondary aggregates, this was traced to be as a result of higher peaks of hydration minerals of the concrete, coupled with its low tortuosity and compactness. However, a laterized concrete mix containing both 90% of ceramic fine and 10% of laterite as fine aggregate provided the optimal strength out of all the modified mixes. Although, the strength reduction was about 9% when compared with the reference case, however, this reduction in strength is acceptable, and does not compromise the use of these alternative aggregates in structural concrete.


Awoyera, P., Akinmusuru, J., Dawson, A., Ndambuki, J., & Thom, N. (2018). Microstructural characteristics, porosity and strength development in ceramic-laterized concrete. Cement and Concrete Composites, 86,

Journal Article Type Article
Acceptance Date Nov 21, 2017
Online Publication Date Nov 22, 2017
Publication Date Feb 1, 2018
Deposit Date Nov 27, 2017
Publicly Available Date Nov 23, 2018
Journal Cement and Concrete Composites
Print ISSN 0958-9465
Electronic ISSN 1873-393X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 86
Keywords ceramic waste; microstructure; ITZ; mineralogy; porosity; laterite
Public URL
Publisher URL


Paul Awoyera - Final CCC paper.pdf (2.8 Mb)

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