ASTM C109/C109M-13e1 pdf free.Standard Test Method for Compressive Strength of Hydraulic Cement Mortars. 3. Summary of Test Method 3.1 The mortar used consists of I part cement and 2.75 parts of sand proportioned by mass. Portland or air-entraining portland cements are mixed at specified water/cement ratios. Water content for other cements is that sufficient to obtain a flow of 110...