The floor placement is running smoothly. Concrete slumps have ranged from 4 to 6 in.—the specification requirements—and the last truck is on site with about 12,000 cu. yd. of concrete on the ground.

When people hear the term “slump,” most think about posture; think of concrete slump as "concrete posture." In technical terms, slump is a measured indication of the workability, or flow, of a mix.

Typically, concrete mortar mixing is required on-site in coal mine tunnels to meet the operational needs of the shotcrete support spraying units. Then the mixed concrete mortar is conveyed to the ...