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University of New Mexico Civil Engineering Department Civil Engineering Materials Laboratory, CE 305L DENSITY OF HYDRAULIC CEMENT ASTM C188 Scope This test method covers the determination of the density and specific gravity of hydraulic cement. The specific gravity is used in the design and control of concrete mixtures. The density of hydraulic cement is defined as the mass of a unit volume of the solids. |
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Apparatus Le Chatelier Flask – 250 mL nominal volume. Balance – 0.01g resolution. Materials Hydraulic Cement ~ 64 g. Kerosene, free of water and naphtha (0.73 mg/L density at 23°C). |
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Procedure Dowload the Procedure for Density of Hydraulic Cement Download the Excel Lab Form for Density of Hydraulic Cement • Weigh the empty flask with stopper; record this weight as WF . Fill the flask with kerosene to the 24 mL mark, weigh the flask and kerosene; record this weight as B . • Empty the kerosene until half full. Introduce ~64 g of cement weighed to the nearest 0.05 g in small increments into the flask. Record the weight of the dry cement as, A . • Partially fill the flask with kerosene (approximately half full). Make sure all the cement is washed into the flask during this operation. • Place stopper in flask and roll the flask in an inclined position, or gently swirl in a horizontal circle. Do so until no further air bubbles rise to the surface of the liquid. • Slowly add additional kerosene to the flask, washing all of the cement into the flask, to a pre-selected calibration mark (e.g., the 24 mL mark). Weigh the flask with the cement and kerosene; record this weight as, C . • Empty the flask and wash clean of all cement using kerosene as the washing agent. Calculation• Calculate the specific gravity of the cement as: Gc = (A* ( S.G .K)) / (B+A-C) • Calculate the cement density, r , as follows:r (Mg/m3) = r (g/cm3) = rw Gc , where r w is the mass density of water (1g/cm3). Report 1) The density to the nearest 0.01 g/cm3 . 2) The specific gravity to the nearest 0.01. |
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