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Question
In case of concrete pavement, why is requirement of 95% by mass of quartz grains are specified in contract?
Answer In universal Specification of Civil Engineering, in Clause 10.09 it states "Fine aggregate for concrete shall be usual river-deposited sand consisting of at least 95 percent by mass of quartz grains". Aim of such requirement is to control excellence of river sand. As quartz is a strong and hard material, using a far above the ground percentage of quartz in aggregates of concrete is able to enhance strength and durability of surface texture of concrete carriageway.
In adding, such specification needs a high percentage of quartz content, thereby dropping the probability of being there of impurities as shell.
HSC approved codes of pratice
Supplementary or Untensioned Reinforcement It is that reinforcement, provided in prestressed concrete member, which is not provided in a stretched condition like tendons.
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