Use of Belt Conveyors to Transport Mass Concrete
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1974
- Accession Number
- ADA010327
Entities
People
- Kenneth L. Saucier