19 CONCRETE MIXES-NAMELY, CEMENT-SAND MIXED MATERIALS WITH SPECIAL ADDITIVES FOR STRENGTHENING, WATERPROOFING, COLORING, PROVIDING FLEXIBILITY, HEAT RESISTANCE, OR NON-FOAMING QUALITIES TO THE CONCRETE, AND APPARATUS FOR HIGH PRESSURE MIXING, PUMPING AND SPRAYING APPLICATIONS FOR CONCRETE MIXES, INCLUDING SWIMMING POOLS, GROUTING, STUCCO, REFRACTORY LININGS, INSULATION, FACING FOR BUILDINGS, AND THE LIKE