In the research influence of the storage time of the 3 most used cements in the city of Trujillo, which will allow to know to engineers and construction masters the time which they can store their cement without reducing the properties of the mortars that are made with them, on the compressive strength, fluidity and time of setting of hydraulic cement; for this investigation was used fine aggregate of 2.4, and cements type ICo, type MS and type I, and dosages used were cement: sand 1:3 and 1:4, with a constant water/cement ratio of 0.75, the Cement was stored indoors within the campus of the National University of Trujillo with a relative humidity in air around of 88%, which was measured with a digital thermo-hygrometer. The mortar made with these cements was evaluated at different storage times of 5 days, 10 days, 15 days, 20 days, 25 days, 30 days, 35 days, 40 and 45 days. For the shap...