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In concrete pavement, why is the requirement of 95% by mass of quartz grains are specified in contract?

Road Site Supervision Engineering Concrete Civil Engineering
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Question added by Mohamed Galal Hussein Ahmed Mohamed , Technical Mnager , Fast Building Contracting Co.
Date Posted: 2015/02/24
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faith beg-asan
by faith beg-asan , Quantity Surveyor , Archen Engineering Consultant

This is to control the quality of river sand. As quartz is a durable and hard material, using a high percentage of quartz in aggregates of concrete can enhance the strength and durability of thesurface texture of concrete carriageway.

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