ASTM C94/C94M-15a pdf free.Standard Specification for Ready-Mixed Concrete. ASTM C94/C94M covers ready-mixed concrete as defined in 3.2.2 (Note 1). Requirements for quality of ready-mixed concrete shall be either as stated in this specification or as ordered by the purchaser. When the purchaser's requirements, as stated in the order, differ from those in this specification, the purchaser's requirements shall govern. This...