A quarry with plenty of space

Planetary Resources has recently announced a bold plan to mine asteroids in near-Earth orbits. Kiwi Netta Burnside provides a tongue in cheek perspective of the new ?space race? to mine platinum and other minerals.
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New test method for assessing fine aggregate

Traditionally, good quality manufactured sand for use in concrete mixes has been achieved by measuring and chemically treating the deleterious clays within the fines. Leon Bablouzian, Nathan Tregger and Tasha Eagle outline a new test procedure for assessing clay contamination.

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