Resilient Modulus Of Free Thaw Affected Granular Soils For Pavement Design And Evaluation Part 3 Laboratory Tests On Soils From Albany County Airport

Author : Thaddeus C. Johnson
Publisher :
ISBN 13 :
Total Pages : 146 pages
Book Rating : 4.:/5 (639 download)

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Download or read book Resilient Modulus of Freeze-Thaw Affected Granular Soils for Pavement Design and Evaluation. Part 4. Field Validation Tests at Albany County Airport written by Thaddeus C. Johnson and published by . This book was released on 1986 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stress-deformation data for unbound base, subbase, and silty sand subgrade soils in two airfield pavements were obtained from in situ tests and laboratory tests. Surface deflections were measured in the in situ tests, with a falling-weight deflectometer, when the soils were frozen, thawed, and at various stages of recovery from thaw weakening. The measured deflections were used to judge the validity of procedures developed for laboratory triaxial tests to determine nonlinear resilient moduli of specimens in the frozen, thawed and recovering states. The validity of the nonlinear resilient moduli, expressed as functions of externally applied stress and moisture tension, was confirmed by using the expressions to calculate surface deflections that were found to compare well with deflections measured in the in situ tests. The tests on specimens at various stages of recovery are especially significant because they show a strong dependence of the resilient modulus on moisture tension, leading to the conclusion that predictions or in situ measurements of moisture tension can be used to evaluate expected seasonal variation in the resilient modulus of granular soils. Keywords: soil tests; Frozen soils; New York; Asphalt concrete; Frost action; Moisture tension; Resilient modulus; Roads; Thaw weakening.