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|Title:||Use of belt conveyors to transport mass concrete|
|Authors:||United States. Army. Office of the Chief of Engineers.|
Saucier, K. L.
|Publisher:||Concrete Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical report (U.S. Army Engineer Waterways Experiment Station) ; C-74-4.|
Abstract: A series of tests was conducted to determine the effects of using conveyor belts to transport concrete. Concrete mixtures containing aggregate up to 6 in. in nominal maximum size were mixed, placed on conveyors arranged in a triangular pattern, transported up to simulated distances of 6000 ft, and tested for changes in temperature, air content, and workability (slump). The results indicate: (a) no change in temperature of the concrete results due to conveying, per se; (b) less than 0.5 percent loss of air may be expected from concrete containing approximately 5 percent air; (c) slump loss of approximately 1-1/2 in. may be expected when conveying for 1500 ft or less within 10-15 min; (d) comparative tests of idle concrete showed a 1-1/2 in. slump loss at 20-25 min; (e) indications are that slump loss is increased with (1) increased belt travel time and (2) for a given travel time, greater belt speed; and ( f ) when conveyor belts are kept full, no segregation due to conveying is apparent.
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