| 摘要 |
PROBLEM TO BE SOLVED: To correctly measure the masses of aggregate and water in consideration of a percentage of surface moisture of the aggregate. SOLUTION: In the present metering method of a concrete material, first water and fine aggregate are charged in a metering tank so that the fine aggregate is made an immersed aggregate not coming out from the water surface while the water overflows from the tank, and the tank is filled with the immersed aggregate (101). Next, the total mass Mf of the immersed aggregate is measured (102). By using equations (1) and (2), the mass Ma in a surface dry state of the fine aggregate and the mass Mw of the water are calculated from the total mass Mf of the fine aggregate. On the occasion of metering the fine aggregate by the above procedure, measurement of the total mass Mf of the immersed aggregate is repeated in real time (101-103) until the mass Ma in the surface dry state of the aggregate reaches a predetermined amount of charge (104, NO), while the charge of the aggregate in the metering tank is executed continuously at a prescribed speed. The charge of the fine aggregate is ended when the mass Ma in the surface dry state thereof reaches the predetermined amount of charge (104, YES).
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