Concrete Mixer Performance Vidalia Mattress Casting Plant Vidalia, Louisiana,
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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A 3-cu-yd-capacity stationary-drum mixer was evaluated for effectiveness in mixing 3-cu-yd batches of lean structural concrete at four mixing times. The following tests were made on samples of concrete taken from the front, middle, and back portions of the mixer discharge coarse aggregate content, unit weight of air-free mortar, and moisture and cement content of the mortar fraction. One batch was tested after 2-min mixing time, two after 1-34 min, three after 1-12 min, and one after 1-14 min. The mixer was found to perform satisfactorily when mixing 3 cu yd of 1-12-in. nominal size coarse aggregate concrete with a charging time of approximately 25 sec, and a minimum mixing time of 1-12 min.
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