Avanti International 822 Bay Star Blvd. Webster, TX 77598 800-877-2570 281-486-5600      Select Product Below Show All AC-50W Root Inhibitor AV-100 Chemical Grout AV-101 Catalyst T AV-102 Catalyst AP AV-103 Catalyst SP AV-105 Ethylene Glycol AV-118 Duriflex Acrylic Gel AV-160 SuperGel AV-200 Dura-Set AV-202 Multigrout AV-208 Acetone AV-215 Resin Rod AV-219 Fibrotite/Oakum AV-222 Cleaner AV-248 Flexseal AV-249 Accelerator AV-254 Gel Seal AV-255G Grout Side Accelerator AV-257 Icoset AV-275 Soilgrout AV-278 Low Vis Hydro AV-279 Low Vis Accel AV-280 Hydrofoam AV-280-12 Hydrofoam AV-281 Hydrocel AV-284 Pump Wash AV-290 Fast-Set AV-310 Hydro Sealant AV-315 Micro Foam AV-330 Safeguard AV-333 Injectaflex AV-350 Multi Gel AV-351 Accelerator Potassium Ferricyanide (KFe) Ultrafine Cementitious Grout Show All _____________________________________________________ Select Grout Type Below Show All Additives and Catalysts Cementitious Grout Chemically Activated Gel Elastomer Hydrophobic Foam Hydrophylic Foam Hydrophylic Gel Pumps Safety Supplies Show All _____________________________________________________ Select Application Below Show All Airports Concrete Repair Curtain Grouting Dams Encapsulation of Hazardous Waste Geotechnical Laterals Mainline Sewers Manholes Mines Oil Wells Parking Structures Probe Grouting Sewers (all applications) Soil Stabilization Storm Sewers Subways Tunnels Underground Structures Show All _____________________________________________________ << Go back to previous page Date: 1960 Author: American Cyanamid Publication: AM-9 Technical Manual Title: Shutting Off Seepage at Missile Silo LOCATION: Atlas Missile Silo; York, Nebraska, U.S.A. OWNER: U.S. Government CONTRACTOR: Western Contracting Company ENGINEER: Soil Testing Services, Inc. PROBLEM: Excavation had progressed 80 feet at this missile installation when water seepage became a problem. Excess hydrostatic head pressure had caused a “quick” condition which resulted in the caving in of one of the quadrants. Deep wells were drilled in an attempt to lower the local water table, to no avail. SOLUTION: When spilling, as well as drilling deep wells, proved ineffective, the contractor turned to grouting to get the job going again. APPLICATION: In the caved areas, the loose, disturbed soil accepted cement grout, and this was pumped until it became obvious that most of the cement was being washed away before it set. AM-9 was then injected to fill the voids still open after cement grouting. Because the cement grout would not penetrate the fine soil in the uncaved areas, AM-9 was used alone. Chemical grout was placed through pipes driven from the surface. Two rings of pipes were used, spaced about 18 inches apart. Pipes in the inner ring were staggered with those in the outer. Spacing between pipes in both rings was about three feet. Gel time varied from 1 ½ to 3 minutes designed to leave narrow gaps between adjacent holes. Groundwater flowing through these gaps into the excavation carried the grout placed in the outer row into the gaps, thus effectively plugging them. RESULTS: Grouting was accomplished quickly and effectively. After completion of the entire grouting pattern, work on the silo was resumed, and no further caving problems occurred during excavation. Note: In 1978, AM-9 Chemical Grout was replaced in the marketplace by AV-100 Chemical Grout.