NEW MIX DESIGN APPROACH FOR POLYMER CONCRETE AS AIRPORT PAVEMENT REPAIR MATERIAL BASED ON FILM THICKNESS CONCEPT

摘要

Due to its superior bonding capability to the substrate materials and a good resistance to thefreezing and thawing cycles, polymer concrete has been widely used for repairing airfieldpavements. However, polymer concretes used in repairing airport pavements in Korea did notlast as long as originally predicted possibly due to the incompatibility of coefficient of thermalexpansion (CTE) between the polymer concrete and the substrate concrete material. To lower theCTE of the polymer concrete, the less amount of polymer should be used along with the higheramount of coarse aggregates. To determine the optimum amounts of polymer and coarseaggregates, a new concept of film thickness is proposed. In this research, the laboratoryevaluation has been performed on the mixtures of polymer concrete to measure compressivestrength and CTE. Based on these test results, it was discovered that higher amount of coarseaggregates was effective in lowering the CTE value while maintaining the higher compressivestrength due to a thicker film thickness. As expected, the CTE of polymer concrete decreased asthe amount of polymer decreased. Based on the limited laboratory test results, in order to satisfya minimum requirement of compressive strength 21MPa for repair material in Korea, a filmthickness of 33.5μm is recommended. This minimum film thickness can be achieved by using8.2% polymer and 91.8% sand. However, if the up to 40% sand is substituted with coarseaggregates, the amount of polymer can be reduced to 6.35% to achieve the same film thickness.