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Effect of Fineness of Basaltic Volcanic Ash on Pozzolanic Reactivity, ASR Expansion and Drying Shrinkage of Blended Cement Mortars

1
Department of Civil and Environmental Engineering, College of Engineering, King Faisal University (KFU), Al-Hofuf, Al-Ahsa 31982, Saudi Arabia
2
Department of Chemical Engineering, College of Engineering, King Faisal University (KFU), Al-Hofuf, Al-Ahsa 31982, Saudi Arabia
3
Department of Environmental Sciences, COMSATS Institute of Information Technology, Abbottabad 22060, Pakistan
*
Author to whom correspondence should be addressed.
Materials 2019, 12(16), 2603; https://doi.org/10.3390/ma12162603
Received: 30 June 2019 / Revised: 29 July 2019 / Accepted: 10 August 2019 / Published: 15 August 2019
(This article belongs to the Special Issue Concrete and Construction Materials)
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Abstract

This study focuses on evaluating the effect of the fineness of basaltic volcanic ash (VA) on the engineering properties of cement pozzolan mixtures. In this study, VA of two different fineness, i.e., VA fine (VF) and VA ultra-fine (VUF) and commercially available fly ash (FA) was used to partially replace cement. Including a control and a hybrid mix (10% each of VUF and FA), eleven mortar mixes were prepared with various percentages of VA and FA (10%, 20% and 30%) to partially replace cement. First, material characterization was performed by using X-ray florescence (XRF), X-ray powder diffraction (XRD), particle size analysis, and a modified Chappelle test. Then, the compressive strength development, alkali silica reactivity (ASR), and drying shrinkage of all mortar mixes were investigated. Finally, XRD analysis on paste samples of all mixes was performed to assess their pozzolanic reactivity at ages of 7 and 91 days. The results showed increased Chappelle reactivity values with an increase in the fineness of the VA. Mortars containing high percentages of VUF (20% and 30%) showed almost equal compressive strength compared to corresponding FA mortars at all ages, however, the hybrid mix (10% VUF + 10% FA) exhibited higher strength than that of the reference mix (100% cement), particularly, at 91 days. At low percentages (10%), ASR expansion in both VF and VUF mortars was higher compared to the corresponding FA mortar and the opposite behavior was observed at high percentages (20% and 30%). Among all the mixes including the control, mortar with VUF was found to be most effective in controlling drying shrinkages at all ages. The rate of consumption of calcium hydroxide (Ca(OH)2) for pastes containing VUF and FA was almost the same, while VF showed low Ca(OH)2 intensity. These results indicate that an increase in the fineness of VA significantly improvs performance, and therefore, it could be a feasible substitute for commercial admixtures in cement composites. View Full-Text
Keywords: basaltic volcanic ash; fly ash; pozzolanic reactivity; compressive strength; alkali silica reactivity; drying shrinkage basaltic volcanic ash; fly ash; pozzolanic reactivity; compressive strength; alkali silica reactivity; drying shrinkage
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Khan, K.; Amin, M.N.; Saleem, M.U.; Qureshi, H.J.; Al-Faiad, M.A.; Qadir, M.G. Effect of Fineness of Basaltic Volcanic Ash on Pozzolanic Reactivity, ASR Expansion and Drying Shrinkage of Blended Cement Mortars. Materials 2019, 12, 2603.

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