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Data on 10-year compressive strengths of concrete cylinders made from 12 commercial high-early-strength cements are given, supplementing the results up to 1 year given in Research Paper 799.1 When cured in moist air, the concretes generally continued to gain strength between 1 and 10 years. For concretes stored in the air of the laboratory, the 10-year strengths are approximately equal to those at 28 days. Comparisons are given between strengths of concretes made in 1910, 1930, and 1941, showing that concretes made with some present-day cements may attain strengths in 1 month exceeding those for the older cements at 10 years.

Ten-year tests of high-early-strength cement concretes