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

In General Specification of Civil Engineering Works (1992 Edition), in Clause 10.09 it states “Fine aggregate for concrete shall be natural river-deposited sand consisting of at least 95% by mass of quartz grains”.
The aim of such specification 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 the
surface texture of concrete carriageway.

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In addition, such specification requires a high percentage of quartz content, thereby reducing the probability of presence of impurities like shell.

This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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Kanwarjot Singh

Kanwarjot Singh is the founder of Civil Engineering Portal, a leading civil engineering website which has been awarded as the best online publication by CIDC. He did his BE civil from Thapar University, Patiala and has been working on this website with his team of Civil Engineers.

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