GROUTING SILT AND SAND AT LOW TEMPERATURES. A LABORATORY INVESTIGATION

This report presents data from an experimental program undertaken to develop information on proposed and existing chemical grout solutions to provide engineering properties in connection with grouting of soils in ambient temperatures of 39 deg. plus or minus 1 deg. F (3.88 deg C) and below. Twelve grout solutions were investigated, including organic chemicals, sodium silicates, cements, and clay (bentonite). Set or gel tests were performed on each chemical solution, in the center of which a thermocouple was placed for measuring the rates of heat of reaction, except those of the cements and the clay. These solutions consisted of the mixing portions of the chemicals and were placed into 4-in.-diam by approximately 6-in.-long cylindres at an ambient temperature of 39 deg. F. The components of each chemical were also tempered to 39 deg F temperature before the mixing. Most of the solutions were tested at this temperature except those that did not seem to become too viscous to use as a grout material for injection into soils. Other set or gel tests were performed at approximately -26 deg. F for one lignin based product; the results of all set-tested products are presented in terms of their dependence on temeprature and time. Cylindrical samples of sand and silt soil, 2.75 in. diameter by 7 in. long, were then pressure infected at 20 lb/sq in. (39 deg. F ambient), and the soil samples were allowed to set overnight, unless otherwise stated, before being soaked in a 39 deg F water-bath for 7 days to check the integrity of the injected samples. Samples that were not dissolved were taken from the 70 day water-bath and were then subjected to unconfined compressive strength tests. The stress-strain data obtained are presented. Seventy-two soil samples were used during the investigation. As the infection process progressed, some materials and soil type samples were eliminated as the ambient temperaturse were lowered. Unconfined compressive strength tests revealed strengths of pressure-injected samples from 3 lb/sq in. to 1624 lb/sq in. The grout material that stressed to 1624 lb in, a urethane, was also successfully injected into a frozen sample in the final part of the program. /Author/

Media Info

  • Features: Appendices; Figures;
  • Pagination: 38 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00195626
  • Record Type: Publication
  • Report/Paper Numbers: CRREL Report 79-5
  • Files: TRIS
  • Created Date: Sep 29 1979 12:00AM