Movement Characteristics of Aggregates in Asphalt Mixtures during the Wheel Tracking Test
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概要
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The deformation characteristics of asphalt mixtures in the crossing direction during the wheel tracking test (1 h, 2500 passes) at high temperature were investigated using dense graded (13F) and drainage asphalt mixture. The two-dimensional movement of the aggregates due to the wheel load was analyzed by right angle photography of the specimen. The behavior of the aggregates was divided into three stages (first, second, and final stage). The aggregates in each mixture moved in the vertical direction under the load, which reflects consolidation of the asphalt mixture. The aggregates moved in the horizontal direction on the surface near the load, which reflects the flow of the asphalt mixture. The aggregates also moved with rotation in both regions. The net result was absence of movement. In addition, the volume change of the asphalt mixture caused by deformation of surface was closely related to the deformation just under the load in the first stage. The asphalt mixture after the wheel tracking test was cut to measure the density. The results showed that the density increased just under the load and decreased in the upper part of the surface near the load.室外で作製した密粒度アスファルト混合物（13F）および排水性アスファルト混合物を用い，ホイールトラッキング試験を行い横断方向における深さごとの各骨材の移動特性について検討した。試験全体（約1時間，2500 pass）を初期，中期，後期に分け骨材の動きを解析した結果より，荷重直下では圧密，側方部では流動が支配的であることが明らかになった。また，変形時の骨材の動きには回転を伴い，荷重直下，荷重の境部分で大きな回転を伴うこと，表面の変形から得られた体積変化より，WT試験時のアスファルト混合物の変形には体積変化が生じ，初期の荷重直下の変形が大きく関係する結果が得られた。WT試験後の供試体の密度分布を計測した結果，両混合物ともに荷重直下では増加し，両脇部上部で減少する傾向を示した。また，密度変化の割合は密粒度アスファルト混合物（13F）が顕著であった。
- Japan Petroleum Instituteの論文
- 2003-00-00
Japan Petroleum Institute | 論文
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