Pneumatic Concrete Placement for Shaft and Adit Closures.
Available for Reference At Bureau Libraries NTIS: PB 93-113991 :33 pages
A system was developed to pneumatically seal mine entries with a minimum of equipment and expense. This system mechanically feeds and pneumatically transports aggregate mixed with the proper amount of water and pneumatically transports a metered amount of dry cement.
CP; Final Contract Report;
NTIS Accession No.
Available for Reference At Bureau Libraries; NTIS: PB 93-113991