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The formation of internal cracks in asphalt mixtures in the wheel tracking test at high temperature was investigated in dense graded (13F) and drainage asphalt mixtures prepared outside. Such cracks are caused by movement of aggregates in asphalt mixtures with distance separation in the crossing direction under passes of the testing wheel. The movement of aggregates during the wheel tracking test (1 h, 2500 passes) at 0 passes, 600 passes, 1900 passes and 2500 passes was analyzed by photography. Greater deformation of aggregates in asphalt mixtures occurred at 50-60 mm from both tire ends in the case of dense graded asphalt mixture (13F) and at both tire ends in the case of drainage asphalt mixture. Local strain in those areas exceeded the maximum failure strain of the mixtures in the tensile test. Internal cracking may occur under passes of the wheel at high temperature, and cracks may appear in the surface with time, which has not been considered until now.室外で作製した密粒度アスファルト混合物密粒13Fおよび排水性アスファルト混合物排水性を用いたホイールトラッキング試験を高温で行い荷重直角方向の骨材の動きから走行回数の増加とともに距離の離れる骨材に着目し内部ひび割れの発生に対する検討を行った。試験約1時間2500 pass中の0 pass600 pass1900 pass2500 pass時の骨材の動きを解析した結果より密粒13Fではタイヤ両端より5060 mm程度外側に排水性ではタイヤ両端部で動きの大きい骨材が表面だけでなく内部にも見られた。解析結果から得られた局部的なひずみは既往の直接引張試験におけるアスファルト混合物の破壊時のひずみの最大値を大きく上回っていた。この結果これまで考えられていなかった高温時における車両走行でも内部にひび割れが発生し時間の経過とともに表面にひび割れが現れる可能性があることを明らかにした

Crack Formation in Asphalt Mixtures in the Wheel Tracking Test at High Temperature