Correlation of resistance value (R-value) with California Bearing Ratio (CBR) for use in the design of flexible pavements
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2005
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University of Hawaii at Manoa
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The Resistance Value (R-value) is commonly used by the Hawaii Department of Transportation engineers to design the thickness of flexible pavements. Direct measurements of the R-value require equipment that is not readily available to most practicing engineers in the State of Hawaii. Typically, the R-value is indirectly based on the results of the California Bearing Ratio (CBR) tests. Knowing the CBR, the R-value is estimated based on published correlations. However, these correlations were established for soils outside the State of Hawaii. Moreover, these correlations were not established for directly relating R-value and CBR, but rather for estimating other parameters such as resilient modulus, soil support value or modulus of subgrade reaction. CBR, R-value and index tests were performed on tropical residual soils from four locations on the island of Oahu in the state of Hawaii. Based on the test results, five correlations were developed to estimate the R-value. Among these procedures is one relating R-value to index properties alone, without reference to the CBR value. The limitations of each procedure and the choice of method are discussed. Some tropical residual soils can undergo irreversible changes upon drying. One of the soils sampled had a relatively high natural water content. As a secondary objective, this soil was tested at three different stages of drying: first at its natural or in-situ state, second after oven drying the soil and third after drying the soil to approximately half its natural water content (intermediate). This material can be regarded as three different soils corresponding to the various stages of drying. The CBR and R-value were observed to increase from the in-situ to the oven-dried samples. The oven-dried samples were excluded from the correlations described above because these soils were dried to temperature extremes that regular soils do not experience, and therefore, are judged to be inappropriate for inclusion in the correlations. The intermediate samples were included in the correlations because soils used as fill material may undergo some drying prior to compaction in the field.
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Soils, Pavements--Design and construction--Environmental aspects
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Hawaii
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Theses for the degree of Master of Science (University of Hawaii at Manoa). Civil Engineering; no. 4022
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