SNOW ICE AND PERMAFROST RESEARCH ESTABLISHMENT WILMETTE ILL
Results are reported of 245 in-place supported beam tests and 56 in-place cantilever beam tests conducted during the 1957-58 winter on clear ice and a combination of clear and snow-ice from Chassel and Keweenaw BaysMich.. The supported beams had a higher computed flexural strength than similar cantilever beams. The flexural strength of the supported beams with the surface layer in tension was always higher than the supported beams with the bottom layer in tension. As reported earlier, the flexural strength of cantilever beam tests was highest when the bottom layer was in tension. On a clear day with air and ice temperatures near 0C, ice strength will decrease by as much as 6 times from morning to mid-aft. The testing equipment is illustrated, summary data are tabulated and graphed, and results of individual tests are appended. Author
Also available as PB-163 661. See also Rept. no. SIPRE-TR-59 dated Dec 59, AD-236 204.