Abstract
Physical characterization study is carried out on the Mansehra Granite, Hakale Granite, quartzite and dolerite from Mansehra area to explore their potential for utilization as construction materials. Laboratory tests reveal specific gravity (2.65–3.02), water absorption (0.32–0.38 %), Aggregate Impact and Aggregate Crushing values (17.26–27.01 % and 15.59–21.21 %), Flakiness and Elongation Index (6.01–7.80 % and 5.95–9.39 %), sulphate soundness (2.19–4.07 %) and Los Angeles abrasion value (28.13–35.70 %) of these rocks. Values of these parameters were compared with the ASTM and BS standards which indicate that Mansehra Granite, Hakale Granite, quartzite and dolerite can be the potential source for dimension stone, road and concrete aggregate. Stripping test indicates suitability of these rocks as aggregate for asphalt wearing course. Unconfined compressive strength of gneissic and massive Mansehra Granites varies from 61.50 to 66.20 MPa. Owing to lower unconfined compressive strength, higher flakiness and elongation index, aggregate impact and crushing values, the gneissic Mansehra Granite is not recommended as dimension stones, road and cement concrete. Petrographic studies indicate presence of strained quartz in Mansehra Granite, Hakale Granite and quartzite which suggest that these rocks are prone to alkali-silica reactivity potential and may not be used as cement concrete aggregate.
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