Accession Number : ADA128219


Title :   Properties of Urea-Doped Ice in the CRREL Test Basin,


Corporate Author : COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH


Personal Author(s) : Hirayama,Ken-ichi


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a128219.pdf


Report Date : Mar 1983


Pagination or Media Count : 54


Abstract : In the course of model tests with urea-doped ice in the CRREL Ice Engineering Facility test basin, the growth process and the physical and mechanical properties of the model ice were investigated. The parameters which were varied were: urea concentration in the tank water, air temperature during growth, growth duration, and tempering time. Uniformity of ice thickness and ice mechanical properties over the whole tank area were found to be satisfactory. The structure of the urea-doped ice was found to be similar to that of the ice except for a relatively thick incubation layer over a dendritic bottom layer. Empirical relationships were established between: ice thickness and negative degree-hours; mechanical properties and growth temperature, urea concentration, and ice thickness; and reduction in mechanical properties and tempting time. The results of the study are presented in charts which permit reliable scheduling of model tests with required ice thickness and ice flexural strength. (Author)


Descriptors :   *STRUCTURAL PROPERTIES , *ICE , *MODEL TESTS , *DOPING , *UREA , TEMPERATURE , THICKNESS , MECHANICAL PROPERTIES , PHYSICAL PROPERTIES , ICE FORMATION , CHEMICAL COMPOSITION , FLEXURAL STRENGTH , DATA ACQUISITION , ARMY RESEARCH LABORATORIES , MODEL BASINS


Subject Categories : Organic Chemistry
      Snow, Ice and Permafrost
      Test Facilities, Equipment and Methods
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE