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Mix design of Cast stone vs. precast concrete

Mix design of Cast stone vs. precast concrete

Mix design of Cast stone vs. precast concrete

(OP)
Hello, folks,

  I am doing a new research project regarding to the " Cast-Stone". I have reviewed all the specifications of cast stone from cast stone institute, but still did not get clear idea about how to do mix design of cast stone.  I understand that the requirement of physical properties is a little bit different between the cast stone and arthitectural precast concrete regarding to the strength and freeze-thaw resistance. But is the mix design method is similar?  

   Moreover, About aggregates, it is said in the specification that " exception for gradation" while ASTM C33 should be followed? so, how is the gradation of aggregates and how to optimize the gradation?

Any input would be greatly appreciated.

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