fly ash handling system News

  • ASTM C1491 - 11 standard specification for concrete roof pavers

    This specification covers concrete roof pavers that are machine-made from hydraulic cement, water, and suitable mineral aggregates with or without the inclusion of other materials, for use as roof ballast and protection of roof membranes. Requirements for ballast weight per unit area shall be specified separately. The average resistance ...

    By ASTM International

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