Feasibility assessment on self-healing ability of cementitious composites with MgO

This article discussed on the potential of autogenous self-healing ability of cementitious composites with magnesium oxide (MgO). Further investigation was conducted on the single blended and combination blended composites. For this purpose, 5% of silica fume and 5% MgO were used for single blended...

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Bibliographic Details
Published in:	Journal of Building Engineering Vol. 34; p. 101914
Main Authors:	Saleh Salem Beshr, B., Abdul Mohaimen, I.M., Noor Azline, M.N., Nor Azizi, S., Nabilah, A.B., Farah Nora Aznieta, A.A.
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-02-2021
Subjects:	Autogeneous self-healing Crack sealing Healing compound Magnesium oxide (MgO) Silica fume (SF) Strength recovery Magnesium oxide (MgO) Crack sealing Healing compound Autogeneous self-healing Silica fume (SF) Strength recovery
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Summary:	This article discussed on the potential of autogenous self-healing ability of cementitious composites with magnesium oxide (MgO). Further investigation was conducted on the single blended and combination blended composites. For this purpose, 5% of silica fume and 5% MgO were used for single blended composites whilst for combination blended, both mineral admixtures were combined. A load of 80% ultimate compressive strength of 7 days was applied for cracks fabrication. The healing ability of cementitious composites was evaluated based on macro and micro tests, which included compressive strength, strength recovery, crack sealing and microstructural analysis. The result showed that the presence of silica fume offset the strength reduction by MgO. Autogenous self-healing performance of the MgO specimens was higher compared to specimens without MgO. Moreover, better autogeneous self-healing performance was observed with the inclusion of silica fume alongside with MgO. Promising results were observed in crack sealing of specimens with MgO compared to specimens without MgO. •Mgo slightly decreased the strength of concrete but high strength recovery ratio was achieved.•Silica fume gave high strength development but the lowest strength recovery performance.•Silica fume offset the limitation of MgO and offer better healing ability for concrete.•All concrete with MgO speed up the sealing process, which completes crack closures was obtained at 14 days.
ISSN:	2352-7102 2352-7102
DOI:	10.1016/j.jobe.2020.101914