An increasing availability of sulfur in Canada has led to investigations which indicate that it can be used to make concrete that may be superior to portland cement concrete for certain applications. It is too early to predict with certainty what applications will ultimately prove to be suitable for sulfur concrete but the following appear worth considering: industrial floors, bridge decks, curbs, tanks, pipes or pipe linings. Sulfur concrete exhibits no shrinkage, but a roughly equivalent problem may arise through the thermal contraction that occurs as the fresh concrete cools. It must be mixed at temperatures well above the melting point of sulfur, 240 degrees F. Thermal contraction occurs as the concrete cools from its crystallization temperature of 240 degrees F to the ambient temperature. Thermal movements of sulfur concrete can be expected to be significant, moreover, because the coefficient of thermal expansion of pure sulfur exceeds that of steel or concrete. Durability of portland cement is influenced greatly by freeze-thaw cycles, deicing salts, dilute acids, sulfate attack and alkali-aggregate reaction. With sulfur concrete, durability is predominately influenced by thermal cycling, concentrated rather than dilute acids and heat and fire. Miscellaneous properties of sulfur concrete include its impermeability, low thermal conductivity, possible formation of acid under action of water and sunlight, unreactivity to glass, lack of efflorescence, extremely smooth finish, high coefficient of thermal expansion, reaction to copper, and unpleasant odor when melted.