Title: PAVEMENT DEFLECTIONS TO ESTABLISH SOIL SUPPORT VALUES FOR OVERLAY DESIGN
Abstract: The relationship between dynamic deflections of asphalt concrete pavements, as measured with the dynaflect and the in-place modulus of elasticity (e) of the embankment material using the 12-inch field plate bearing test was investigated. A relationship between resilient modulus (modulus of elasticity of soil subgrade) and soil support value was established in the AASHO road test. Soil support is a measure of the in-place strength and stability of a soil or aggregate mass. Dynaflect and plate bearing test data were collected at nine test sites on five in-service roadways. Plate bearing tests on embankment soils were conducted through access trenches cut to expose the underlying component materials of the pavement structure. The plate bearing elastic moduli (e) values were computed from these tests. Field tests were made on pavement and soils that ranged from poor to extremely high soil support values. The fourth dynaflect sensor (at 36 inches from centerline of load) gave deflections that correlated well with the plate bearing (e) values. Therefore, soil support value can be estimated from deflection data indirectly from the AASHO correlation. This paper discusses the procedures and development of the correlations involved in this investigation. (Author/TRRL)
Publication Year: 1982
Publication Date: 1982-01-01
Language: en
Type: article
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