TEMPERATURE DISTRIBUTION WITHIN ASPHALT PAVEMENTS AND ITS RELATIONSHIP TO PAVEMENT DEFLECTION

Abstract

A METHOD HAS BEEN DEVELOPED TO ESTIMATE THE TEMPERATURES AT DEPTH IN AN ASPHALTIC CONCRETE PAVEMENT UTILIZING THE MEASURED SURFACE TEMPERATURE AND THE 5-DAY AVERAGE AIR TEMPERATURE HISTORY. TEMPERATURE PREDICTION NOMOGRAPHS WERE DEVELOPED FOR EACH HOUR BETWEEN 6 A.M. AND 5 P.M. THIS TEMPERATURE PREDICTION METHOD IS INDEPENDENT OF THE SEASON OF THE YEAR. A METHOD FOR ADJUSTING BENKELMAN BEAM DEFLECTIONS FOR TEMPERATURE EFFECTS HAS BEEN DEVELOPED AND IS PRESENTED. THIS ENABLES THE DEFLECTIONS TAKEN AT ANY TEMPERATURE TO BE ADJUSTED TO A REFERENCE TEMPERATURE, THUS MAKING POSSIBLE DIRECT COMPARISONS OF DEFLECTIONS. AN ANALYSIS OF AASHO ROAD TEST DATA WAS MADE USING THE BOUSSINESQ AND BURMISTER EQUATIONS AND CHARTS. THE RESULTS INDICATE THAT THE TEMPERATURE-MODULUS OF ELASTICITY RELATIONSHIP IS CURVILINEAR, HAS THE SAME BASIC SHAPES AS THE TEMPERATURE-DEFLECTION ADJUSTMENT FACTOR CURVE. THERE APPEARS TO BE A LINEAR RELATIONSHIP BETWEEN DEFLECTIONS ADJUSTMENT FACTORS AND MODULUS OF ELASTICITY. THEREFORE, THERE SEEMS TO BE A TEMPERATURE-DEFLECTION-MODULUS OF ELASTICITY CORRELATION BETWEEN FIELD TEST DATA AND THEORY. /AUTHOR/