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  • Automating mix designs for closed-gap gradations

    IÆm working on creating a mix design submittal based upon a specification that requires closed-gap aggregate gradation. To meet the specification, I need to find, or create, an evenly graded 1 +-inch top size aggregate. This means that the commonly used middle testing sieves, such as the No. 8, No...

  • Design specs for a C-4 wall

    IÆm working with a concrete contractor who is pouring C-4 for his footings in the morning, setting wall forms, and pouring them with C-4 that same day in winter conditions. What is your opinion of this construction process? How will this affect the concrete strength and durability down the road?