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Suitability of mortars produced using laterite and ceramic wastes: mechanical and microscale analysis

Awoyera, P.O.; Dawson, Andrew; Thom, Nicholas; Akinmusuru, J.O.

Authors

P.O. Awoyera

Andrew Dawson

Nicholas Thom

J.O. Akinmusuru



Abstract

Using industrial wastes and local materials as artificial aggregates in cement based materials remains a relevant measure for conservation of natural sources. In this study, novel cementitious mixes containing pulverized ceramic blended cement, ceramic aggregate and laterite were systematically combined to produce cement mortars. The mortar specimens were cured in water for a maximum of 28 days. At maturity, nondestructive tests, X-ray CT scan and ultrasonic pulse velocity, were performed on hardened mortars. Thereafter, a series of predefined properties, namely dry bulk density, compressive and flexural strength, water absorption coefficient (due to capillary) of the hardened mortars were determined. Finally, in order to understand the hydration mechanism of the materials as it relates to the strength properties, microscale tests, SEM and XRD, were used to examine the fragments of the selected mortars. From the results, a mortar sample containing 10% ceramic powder and 100% ceramic aggregate as replacements for cement and sand respectively, gave higher strength values than the reference and other mixes. Microstructural analysis of the best mix revealed that it has larger proportions of ettringite, portlandite and calcite than the reference mix, and this could be responsible for the strength gained. Thus, despite the apparent low reactivity of crushed ceramic material, this can improve bonding in cement-based mixture, when used at an appropriate concentration.

Journal Article Type Article
Publication Date Sep 1, 2017
Journal Construction and Building Materials
Print ISSN 0950-0618
Electronic ISSN 1879-0526
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 148
APA6 Citation Awoyera, P., Dawson, A., Thom, N., & Akinmusuru, J. (2017). Suitability of mortars produced using laterite and ceramic wastes: mechanical and microscale analysis. Construction and Building Materials, 148, doi:10.1016/j.conbuildmat.2017.05.031
DOI https://doi.org/10.1016/j.conbuildmat.2017.05.031
Keywords Ceramic waste, Laterite, Microstructural analysis, Pozzolan, Strength properties, Mortar, Ettringite, Portlandite, Calcite, Quartz
Publisher URL https://doi.org/10.1016/j.conbuildmat.2017.05.031
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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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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