Melchem 38 is a water-soluble, melamine-based, high-range, water-reducing admixture. Melchem 38 meets the requirements of ASTM C494 and AASHTO M194 as Type A and Type F.
ACI provides guidelines as suggestions or recommendations on the water content to provide the desired compressive strength. Never add more water than what is necessary to provide the desired workability. More water equals lowered strength.