Design the concrete for an unreinforced, air-entrained pavement, in a very cold climate where there is no statistical data available for the proposed mix design; 25cm thick; specified 28-day concrete flexural strength of 4.7 MPa; the coarse aggregates have a bulk specific gravity of 2.70; a rodded density of 1650kg/m3 at the saturated surface dry (SSD) condition and a moisture content of 1.5% above the SSD condition; the fine aggregates have a bulk specific gravity of 2.65 with a fineness modulus of 2.75 and a moisture of 5% above the (SSD) condition. The apparent specific gravity of the Portland cement=3.15.