Selection of Materials and Techniques for Use in Sealing Geotechnical Investigation Holes.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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Site investigations typically involve drilling or pushing holes to install sampling or sensing devices or to collect samples from beneath a site. Each hole represents a potential conduit for contaminant flow into the groundwater. Environmental regulations, generally administered by the states, require that all potential pathways be permanently sealed to preserve the integrity of any existing natural geological barriers protecting groundwater. A wide variety of grouts are available, and this research effort was undertaken to select and adapt grouts that can provide highly impervious, permanent seals. Grouts were screened to avoid materials that might be toxic or carcinogenic prior to or alter setting. Special attention was given to finding grouts that had low viscosities and long pot lives required to successfully use the grouts with the through the rod grouting systems now available in some penetrometer units. Laboratory and field tests were undertaken with grouts prepared from sucrose retarded portland cement, calcium sulfate based cement, and calcium hydroxide activated slag. The retarded portland cement-based grout was the most useful. The slag based grout can be a suitable option when a very slow setting grout is required.
- Civil Engineering
- Adhesives, Seals and Binders