| 摘要: | 摘要
交通噪音被發現是社會和生活品質中存在問題的領域之一，因為它會導致環境問題而受到更多關注，根據《噪音控制法》等世界範圍內不斷演進的法規，測試場地標準將成為未來車輛和輪胎噪音測試的重要部分，上述可以遵循 ISO 10844:2014 在測試車道上測量行駛的車輛來實現。ISO 10844內指的路面為密級配熱拌瀝青混凝土鋪面，車道吸音係數要求不超過 0.8，平均剖面深度 (Mean Profile Depth, MPD)標準範圍介於0.3 ± 0.2 mm。本研究通過幾種混合料配合設計和實驗室超級鋪面旋轉式壓實機 (Superpave gyratory compactor, SGC) 壓製試體，評估兩種不同細骨料稜角率、三種不同級配和三種不同空隙率對聲學性能和表面紋理性能的影響，測量結果符合ISO 10844對吸音係數和MPD之要求，本研究建議使用粗和中等兩種級配，其吸音係數和MPD皆有滿意的結果，而細級配往往具有較低的MPD。空隙率、級配曲線、細粒料稜角率與吸音係數呈正相關，同時，粗級配曲線是唯一與MPD呈現高度相關性的參數。本研究發現，可能是因為兩種混合物為達到目標空隙率而使用的壓實圈數不同，細骨料稜角率性能顯示出與早期研究相反的結果，因此，它會影響紋理性能。
關鍵詞: 測試道路, 吸音係數, 平均值紋理深度, 配合設計, 細粒料稜角率
;Abstract
Traffic noise is found to be one of the problematic areas in society and quality of life that gained greater attention as it contributes to an environmental problem. According to the Noise Control Act and other regulations worldwide that continue to evolve, test track standard will become an essential element of the vehicle and tire noise testing in the future. Those can be achieved by measuring the driven vehicle on a test track which is following the ISO 10844:2014. An ISO 10844 surface is intended to be a dense-graded hot-mix asphalt pavement with a sound absorption requirement not exceed 0.8 for the drive lane and 0.3 ± 0.2 mm for the mean profile depth (MPD) standard range. This study aimed at evaluating the influence of 2 different fine aggregate angularity, 3 different gradations lies in the ISO 10844 regulation and 3 different air voids through the several mixture designs and the laboratory mixed and compacted specimen using Superpave gyratory compactor (SGC) on the acoustic performance and surface texture performance which represented as sound absorption coefficient and MPD to comply with the ISO 10844 requirement. Coarse gradation and mediocre gradation of both mixtures are recommended as show the satisfaction result on sound absorption and MPD, while the fine gradation tends to have low MPD. Air void, gradation, and fine aggregate angularity are found to be positively correlated with sound absorption. Meanwhile, a moderate correlation between air void and MPD only found at coarse gradation. In this study, the fine aggregate angularity performance shows the opposite result with the earlier findings possibly due to the different gyration number of compactions that the both mixtures get for reaching the air void target; thus, it interfiled the texture performance.
Keywords: Test track, sound absorption, mean profile depth, mixture design, fine aggregate angularity. |
