Abstract: An improved modified sulfur concrete product is provided in the form of discrete, self-sustaining pellets of modified sulfur concrete which can be shipped and stored for indefinite periods and remelted to yield useable concrete. The pellets are preferably formed by first preparing a quantity of hot modified sulfur concrete (74), followed by passing such concrete (74) into a pelletizing chamber (12) equipped with an elongated auger-type, axially rotatable mixing element (14) and apparatus (16) for the introduction of pressurized air and water into the chamber (12) in the form of a spray. Supplementary pressurized air may advantageously be added at spaced points along the length of the chamber (12).