This paper presents 29Si magic-angle-spinning nuclear magnetic resonance measurements that trace the cement hydration process in cement paste and mortar specimens made from ordinary portland cement, type I. These specimens were moist-cured for 3, 7, 14, and 28/31 d at temperatures ranging from 21" to 80°C. Compressive strength for all tested specimens was also determined. The results show that the degree of hydration (Q' -k Q') and the compressive strength increase with curing times and temperatures. However, at 80"C, the compressive strength decreases while the degree of hydration increases. [

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