1966•Highway Research RecordRequires access
OBSERVATIONS ON FLEXIBLE PAVEMENT DEFLECTIONS IN MARYLAND
W G Mullen, W R Clingan, E T Paulis
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Abstract
IN A LONG TERM STUDY OF HIGH-TYPE FLEXIBLE PAVEMENTS IN MARYLAND, A BENKELMAN BEAM WAS USED TO MEASURE DEFLECTION OF SELECTED PAVEMENTS FOR PERIODS UP TO TEN YEARS. THE DEFLECTION OF NEW PAVEMENTS CONSTRUCTED SINCE 1960 WILL BE MEASURED ONCE DURING THE FALL. ANALYSIS OF DEFLECTION BY MAGNITUDE WITH RESPECT TO SUBGRADE SOIL TYPE, SPRING AND FALL MEASUREMENTS, INNER AND OUTER WHEELPATHS AND PAVEMENT THICKNESS IS INCLUDED. CORRELATION IS DEVELOPED BETWEEN DEFLECTION DISTRIBUTION BY MAGNITUDE AND GENERAL SUBGRADE SOIL TYPE. SIGNIFICANT DIFFERENCES WERE FOUND BETWEEN DEFLECTIONS OF INNER AND OUTER WHEELPATHS AND BETWEEN SPRING AND FALL MEASUREMENTS BY WHEELPATH. RELATIONS BETWEEN DEFLECTIONS AND PERFORMANCE, SUBGRADE MOISTURE CONTENT AND CHANGE IN AVERAGE DAILY TRAFFIC WERE EXAMINED FOR SIGNIFICANCE.