ALKALI-SILICA REACTIVITY OF SOME GRANITIC ROCKS IN KUMASI, GHANA: IMPLICATIONS FOR USE OF ROCK AGGREGATES FOR CONSTRUCTION

Matthew Coffie Wilson (), Bridget Buadi, Maame Opokua Debrah, Kevin Osei-Wireko and Blestmond Afrifa Brako
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Matthew Coffie Wilson: Kwame Nkrumah University of Science and Technology, Department of Geological Engineering, University Post Office, Kumasi – Ghana
Bridget Buadi: National Service Personnel, Kibi Goldfields Limited, Kibi – Ghana
Maame Opokua Debrah: National Service Personnel, Kibi Goldfields Limited, Kibi – Ghana
Kevin Osei-Wireko: National Service Personnel, Kibi Goldfields Limited, Kibi – Ghana
Blestmond Afrifa Brako: Kwame Nkrumah University of Science and Technology, Department of Geological Engineering, University Post Office, Kumasi – Ghana

Geological Behavior (GBR), 2022, vol. 6, issue 1, 22-28

Abstract: This paper seeks to assess the potential of Alkali-Silica Reaction on some granitic rocks in Kumasi in Ghana. Alkali-Silica reactions occur over time between alkaline cement paste and silica contained in rock aggregates as a result of the swelling due to the reaction of certain constituents in the rock aggregates with alkali hydroxides. Alkali-Silica reactions become potentially harmful when they cause significant expansion. Aggregates used for this research were sought from three different quarries, namely, Consar Stone Quarry in Barekese, Nnagot Quarry in Kona and Modern Granite Quarry in Buoho. To achieve the objectives of this project, two test methods were employed such as Accelerated Mortar Bar test (ASTM C1260) and Petrographic analysis. Presence of strained quartz is an indicator for the occurrence of Alkali-Silica Reaction. Samples from Kona contained quite an appreciable amount of strained quartz and exhibited an expansion above the ASTM C 1260 specification, implying that it is potentially reactive and thus not useful for construction works, whilst samples from Barekese, and Buoho were innocuous and may be used for construction works. Supplementary cementing materials such as pozzolans (which are readily available) can be added to concrete mixtures with aggregates from Kona to reduce the harsh effects of ASR.

Keywords: Alkali Silica Reactivity; Granitic Bodies; Accelerated Mortal Bar; Petrography; Strain Quartz (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:zib:zbngbr:v:6:y:2022:i:1:p:22-28

DOI: 10.26480/gbr.01.2022.22.28

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