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|In 1975 the Bureau of Mines Spokane Research Center began a series of laboratory and field tests to investigate the feasibility of developing a substitute for the organic chemicals used in resin roof-bolting systems. An inorganic system, comprised of calcinated gypsum, an accelerator, and microcapsules of water was developed and patented by the Bureau in 1977. The system has several advantages including economics, non- toxicity, nonallergenic, inflammability, and is not based on petroleum products. Two roof-bolting systems utilizing inorganic cements are under development at the Spokane Research Center--a cartridge system, using the microcapsules of water and accelerator, and a slurry system, using a mix-inject method which combines dry powder cement with water for simultaneous injection into a predrilled roof-bolt hole. Several underground field tests have been conducted in eastern coal mines. Test results indicate that inorganic cartridge systems are adequately supporting mine roof in several test sections. Economic potential for the bolt systems appears favorable.|
Additional chapters/articles from the SME-ICGCM book Proceedings Of The 1st Annual Conference On Ground Control In Mining
|Stress And Stability In Coal Ribsides And Pillars||Improved Design Of Coal Pillars For U.S. Mining Conditions||Review Of Pillar Design Equations Including The Effects Of C||Abutment Pillar "Notching" Improves Abutment Tunnel Roof Con||The Influence Of Certain Geologic And Geotechnical Factors O||Considerations Of Gas Outbursts In Using Dome Salt Mines For||An Overview Of Bureau Of Mines Ground Control Research||Stability Behaviour Of Coal Mining Tunnels With Different Su||Strata Disturbance Prediction For Mining Beneath Surface Wat||Monitoring For The Evaluation Of The Stability Of Undergroun||Controlled Thrust And Torque Placement Of Mechanical Anchor||Roklok Polyurethane Binder: A Chemical Injection System For||Resupporting High Roof Falls||A New Combination Friction-Suspension Support System Scott||Inorganic Cement Grouted Bolt System||Development Of A Resin Point Anchor||An Engineering Analysis Of "Squeeze" Failure Of Pillars In T||Ground Control In Multiple Seam Mining||Applications Of Reflection Seismics To Mapping Coal Seam Str||The Use Of Geologic Modeling In The Prediction Of Adverse Ro||Design Of Shield Supports For The U.S. Coal Mining Industry||Longwall Mining Of Thin Seams||Support Selection For The Multi-Lift Mining Method||Design And Operation Of Powered And Entry Supports||Evaluation Of Existing Predictive Methods For Mine Subsidenc||A Study Of Longwall Subsidence In The Appalachian Coal Regio||Subsidence Studies In Thick And Steep Coal Seam Mining|