Influence of temperature and cycles of wetting and drying on modulus of rupture |
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| Institution: | 1. Department of Agronomy and Horticulture, University of Nebraska-Lincoln, Nebraska, 68583, United States;2. Department of Agricultural and Biological Engineering, The Pennsylvania State University, University Park, Pennsylvania 16801, United States;3. Water Sciences Laboratory and School of Natural Resources, University of Nebraska-Lincoln, Lincoln, Nebraska 68583, United States;1. The University of Texas at Austin, Civil, Architectural and Environmental Engineering, 301 E. Dean Keeton St., Austin, TX 78712, United States;2. Oregon State University, Environmental and Molecular Toxicology, 1007 Agriculture and Life Sciences Building, Corvallis, OR 97331, United States;3. Virginia Commonwealth University, Department of Biostatistics, 830 East Main St., Richmond, VA 23298, United States;4. Westat, 1600 Research Blvd., Rockville, MD 20850, United States;5. National Cancer Institute, Division of Cancer Epidemiology and Genetics, Occupational and Environmental Epidemiology Branch, 9609 Medical Center Dr., Rockville, MD 20850, United States;6. U.S. Geological Survey, Water Mission Area, 12201 Sunrise Valley Dr., Reston, VA 20192, United States |
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| Abstract: | Effects of temperature and cycles of wetting and drying on soil modulus of rupture were studied for 2 calcareous soils varying in their tendency to form crusts under field conditions. Modulus of rupture decreased with increase in temperature of wetting and drying. The modulus of rupture of a silty clay loam soil from Al-Raid decreased with the increase in the number of wetting and drying cycles, whereas that for soil from Al-Wahda increased during the first 4 cycles of wetting and drying and decreased during the subsequent cycles. The reduction in modulus of rupture under different treatments of wetting and drying was not associated with any improvement in the stability of soil aggregates. Modulus of rupture correlated strongly with the degree of shrinkage of soil briquets. Low shrinkage in soil briquets coincided with a low modulus of rupture. |
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