NTIS: PB 283 963 Available for Reference At Bureau Libraries :84 pages
Rock bolting has become a major method of coal mine roof support because of its effectiveness, economy, and convenience. The polymeric-resin-bonded bolt has generally proved to be more effective than the mechanically anchored bolt, but the higher cost of the resin bolt limits it to applications where the increased support is essential. The low-cost, high-early-strength cement grout developed during this project will encourage more widespread use of fully grouted roof bolts provided practical installation techniques can be developed. Laboratory tests of four types were performed on various rapid-set and accelerated cement products to find a material with properties suitable for replacing resins. A proprietary gypsum cement was ultimately used with good success. A field test of the cement grout was made in an operating coal mine. No substantial difference was found between the support provided by the cement and the resin.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB 283 963 Available for Reference At Bureau Libraries
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