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  1. Backfill

    Wear Resistant Redux - Polleke's Chutes

    This query follows from the closed thread 342-130950 'Wear Resistant Material for Coal Chutes' One reply may fit very closely to a problem facing me. This is from Polleke(Mechanical), dated 4-Oct-05. Your tonnage rates may be applicable if you could relate the gradation, or even the topsize...
  2. Backfill

    Concrete Mix Water Chemistry

    I have water sources which run moderately high in sulfate (30-220 ppm) and high in nitrate (50 ppm as N). I've been searching for references which may indicate whether these may present problems as concrete mix water. The ASTM STP 169C (Concrete and Concrete-Making Materials has no specific...

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