Mass concrete practice in France is reviewed with special empahsis on heat of hydration and concrete composition. Durability and measurement of the workability of concrete are included along with a discussion of placing techniques.

Reports tests made on materials and mixes to determine thermal properties and adiabatic temperature rise of mass concrete. The tests were made at different agaes in a program that was a paprt of the design studies for Oroville Dam.

Results of an extensive series of tests to determine the influence of the maximum aggregate size on compressive strength are reported. A wide range of cement content and aggregate sizes were used in the large test specimens, used to minimize the effect of speciment size.

Temperature, stress, and moisture conditions such as might occur in a concrete dam were applied to 30 x 30 in. concrete cylinders containing several strain meters and stress meters. The stress meters gave readings close to true compressive stress without corrections.

Variables influencing concrete temperatures, specific cases of cracking, properties of materials, structural movements, and effects of operation of Pine Flat and Folsom dams are reported. Instrumentation details are included.