Concretes made with expansive cements are now well established as construction materials; the cements are identified by the American Concrete Institute as Types K, S, and M, as described in Committee 223 report: "Expansive Cement Concretes- Present State of Knowledge." To obtain full benefit from the properties of these cements and best advantage from the controlled expansion they provide in shrinkage-compensating cement concrete, certain guidelines must be followed. Contraction joints are not needed when construction joints are used at intervals of 40 to 120 feet. The amount of reinforcing steel required by accepted engineering design practices for reinforced concrete is normally sufficient to provide the needed restraint of shrinkage-compensating concretes. The minimum reinforcement recommended by ACI 318 for temperature and shrinkage stresses is more than satisfactory. Shrinkage-compensating concretes generally are more cohesive than conventional concrete and have less tendency to segregate. This makes them particularly adaptable to placement by pumping, provided the mix is properly designed for the purpose. A notable difference between shrinkage-compensating cement concrete and ordinary portland cement concrete is the almost total absence of bleed water after the shrinkage-compensating cement concrete has been screeded and floated. Even when a high slump is used mixing water is consumed at a fairly rapid rate early in the process of hydration. Because no bleed water is seen, the finishers are likely to start finishing operations too soon when they work these concretes for the first time. A good rule of thumb is to delay operations until the slab is firm enough to support the finisher's weight.