Examination of Samples of Bell Canyon Test 1-FF Grout.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
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Portland cement grout identified as BCT-1-FF Bell Canyon Test 1-FF was used in borehole plugging experiments in the Bell Canyon Tests in Hole AEC-7 at the Waste Isolation Pilot Plant site in New Mexico during September 1979 and February 1980. This grout was made with fresh water. A study of this grout was begun in August 1979 in the laboratory to evaluate the possible effects of temperature, pressure, and storage in fresh water or simulated groundwater brine on its phase composition and compressive strength at early ages. Phase composition was determined by X-ray diffraction. Temperatures ranged up to about 150 F and included elevation at a few hours age after mixing pressure was as high as 1500 psi specimens were stored in simulated groundwater brine or in fresh water. Data from 1 to 90 days showed Higher temperature accelerated early strength gain. These differences essentially vanished by 90 days age. Hydration products as identified by X-ray diffraction were normal this indicated that a temperature range of 78 to 153 F was not significant. Pressure did not affect composition. Storage in simulated groundwater brine or fresh water had no detectable effect. Since the BCT-1-FF grout mixture contained added sulfate, it formed more ettringite as judged by X-ray diffraction than comparable portland cement mixtures without added sulfate. Author
- Ceramics, Refractories and Glass