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Abstract:One objective of this study was to determine what correlation existed between the modulus of subgrade reaction as determined by the Plate Bearing Test and the deflection determined by the first snsor of the Lane Wells "Dynaflect". The Research and Development Section of the Louisiana Department of Highways has used the Lane Wells "Dynaflect" and is satisfied with its ability to rapidly and accurately take readings of deflections of a section.
The second objective of this study was to determine the field value of the modulus of subgrade reaction "K" by the use of the Plate Bearing Test. "K" value is used in designing the thickness of concrete pavement for highways and has been assumed to be a constant. Therefore, a more valid and conclusive value of "K" was deemed necessary.
Plate Bearing Tests were conducted on three 6 inch soil cement bases and on one 4 inch hot mix asphaltic concrete base overlying six inches of lime stabilized soil. Undisturbed subgrade cores were taken on which modified consolidation tests were run. Comparison was made of the corrected "K" value and "K" value used by the Design Section to ascertain if the design value of "K" is reasonable.
Ten Dynaflect readings and ten Plate Bering determinations were obtained on each of the four separate projects.
A satisfactory correlation was found to exist between the Plate Bearing values and the first sensor reading of the Dynaflect. This provides our Department with a rapid, economical and valid method of determining the modulus of subgrade reaction.
The present range of "K" value obtained on these construction projects was also determined.
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