| 摘要 |
PURPOSE:To make possible the measurement of the moisture content of aggregate, etc. for concrete by sampling partly the aggregate fed out of an aggregate feeding gate, measuring the weight thereof, adding water to the aggregate and measuring the amt. of the water at which the prescribed volume is obtd. CONSTITUTION:The aggregate fed out of the feeding gate 2 of an aggregate tank 1 is sampled by a sampling conveyor 3 and is fed at a prescribed rate into a measuring tank 4 from which the aggregate is thrown into a hopper 8. The weight thereof is measured by a load cell 6. A stop valve 7 of the hopper 8 is then opened to drop the aggregate into a volume measuring tank 10; at the same time, water is sprayed from a water supply line 12. The valve 11 is closed when a level sensor 13 detects the arrival of the water level at the prescribed height. The water is drained from a discharge pipe 16 until the specified volume is attained, then the total weight of the aggregate and water is determined by the load cell 6. The moisture content of the aggregate is calculated from the two weights determined by the load cell 6, the specified volume and the specific weight of the aggregate. |
