Changsha Huanghua Airport Runway Overlay of Asphalt Concrete Mixture Optimization
SMA asphalt mixture is the old airport pavement overlay of asphalt concrete most commonly used technical solutions, combined with the previous runway coagulation Concrete Asphalt design, from the perspective of Asphalt Mixture Design. Laboratory produced using different asphalt modifier, additives (fiber, anti-rutting agent) to form several SMA asphalt mixture. Laboratory tests are to be determined each program's conventional indicators, such as pavement rutting performance. Analysis of test results, the final mixture is to be determined the optimal program. The results showed that SBS star relative linear modifier better road performance, the selection of PAN fiber than the lignin additive mixture of additives on the adhesion, crack resistance, resistance to water damaging have a larger increase, which for the SMA in the application of the runway asphalt concrete pavement to provide a basis for improvement.
Evaluation of Recycled Projects for Performance
iii IMPLEMENTATION STATEMENT iv LIST OF TABLES vi LIST OF FIGURES vi
METHOD FOR SEPARATELY EVALUATING STRUCTURAL PERFORMANCE OF SUBGRADES AND OVERLYING FLEXIBLE PAVEMENTS
THE STRUCTURAL EVALUATION OFF FLEXIBLE PAVEMENTS IS NOW CARRIED OUT MOSTLY WITH DEFLECTION-MEASURING DEVICES SUCH AS THE DYNAFLECT OR THE BENKELMAN BEAM. THE OBJECT HERE WAS TO DETERMINE WHETHER THE PROPERTIES OF THE DEFLECTED BASIN MEASURED BY THESE DEVICES ON THE PAVEMENT SURFACES COULD MAKE IT POSSIBLE TO EVALUATE THE SUBGRADE AND THE OVERLYING PAVEMENT TOGETHER AND SEPARATELY. IT WAS FOUND THAT, BY MEANS OF THEORETICAL AND FIELD STUDIES, THE MAXIMUM AND OTHER DEFLECTIONS IN THE DEFLECTED BASIN COULD BE USED TO EVALUATE THE STRENGTH OF THE SUBGRADE BEFORE THE PAVEMENT IS LAID OVER IT, THE STRENGTHS OF THE SUBGRADE AND PAVEMENT SEPARATELY AFTER THE PAVEMENT IS LAID, AND THE CHANGE IN STRENGTH OF THE SUBGRADE AND PAVEMENT DUE TO SEASONAL CHANGES OR AGE. A GENERAL CHART WAS DEVELOPED THAT CORRELATES MAXIMUM DEFLECTION AND SPREADABILITY WITH THE SUBGRADE STRENGTH, THE AVERAGE PAVEMENT STRENGTH, AND THE THICKNESS INDEX OF THE PAVEMENT. THIS CHART WAS TESTED FOR SEPARATE STRUCTURAL EVALUATIONS OF THE SUBGRADE AND ITS OVERLYING PAVEMENT FOR PROJECTS IN VIRGINIA. TEN TYPICAL EXAMPLES OF THE PROJECTS ARE GIVEN. /AUTHOR/