| 研究生: |
羅之陽 Lo, Chin-Yang |
|---|---|
| 論文名稱: |
骨材粒徑對排水瀝青混凝土成效之影響 Effects of Aggregate Sizes to the Performance of Porous Asphalt Concrete |
| 指導教授: |
蕭志銘
Shiau, Jih-Min |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 土木工程學系 Department of Civil Engineering |
| 論文出版年: | 2006 |
| 畢業學年度: | 94 |
| 語文別: | 中文 |
| 論文頁數: | 68 |
| 中文關鍵詞: | 骨材粒徑 、標稱最大粒徑 、排水性瀝青混凝土 |
| 外文關鍵詞: | aggregate sizes, nominal maximum aggregate sizes(NMAS), porous asphalt concrete |
| 相關次數: | 點閱:144 下載:1 |
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排水性瀝青混凝土是一種透水性鋪面,採用大量的粗骨材,擁有15%-25%的孔隙率,因此能將路面的水分迅速排除,以維持路面的安全性,所以它有雨天抗滑、增加行車安全與降低水花飛濺等優點,常應用在多雨的地區。歐美各國早在半個世紀前已經開始使用,至今已有完善的規範,日本近年來也發展出自己的一套準則,台灣近年來有越來越多對排水性瀝青混凝土的研究,也訂出一套完整的規範,故未來應以如何更經濟的設計為目標。
本研究採用AC-20等級瀝青,配合9.5mm-NMAS(偏粗)、12.5mm-NMAS(偏粗)、12.5mm-NMAS(偏細)、12.5mm-NMAS(規範外)和19mm-NMAS(偏粗)共五種級配,利用NCAT配合設計法決定最佳瀝青含量,製作SGC試體,最後進行浸水剝脫試驗、間接張力試驗和車轍輪跡試驗,探討不同最大標稱粒徑級配的成效。
由試驗結果發現,9.5mm-NMAS之孔隙率與滲透係數在所有級配中是最低的,且在其他各項成效試驗也都表現最佳,此因9.5mm-NMAS之級配所採用之骨材粒徑相對其他二者明顯偏細,而12.5mm-NMAS(規範外)之級配在所有級配中是表現最差的,19mm-NMAS之級配有些試驗表現還優於12.5mm-NMAS(偏粗)的級配,有可能是因為19mm-NMAS是採用日本級配,細骨材比例有稍微多些的緣故。
綜合實驗結果可以得到以下結論,如果要使用偏粗的級配,提高排水效果,再搭配非改質瀝青,使用9.5mm-NMAS之級配加上適量的纖維是較為適合的,但也只限於交通量不高的路面;若要採用12.5mm-NMAS或19mm-NMAS之級配,必需要使用改質瀝青來增加強度。此外要讓纖維產生最大的功效,在拌合前要讓纖維平均分佈於骨材間,這樣對於維持整個試體的穩定有相當大的功效。
Porous asphalt concrete is characterized by air void ranging from 15 to 25 percent,it allows surface water to drain through its strcture and then to flow laterally away from the pavement structure.The ability of porous asphyalt pavements to drain water quickly results in less water ponding on the pavement surface,thereby reducing hydroplaning,reducing vehicle pray,and providing improved skid resistance.
Objectives of this research were to evaluate the use of porous mixes containing three different kinds of nominal maximum aggregate sizes(NMAS)and to determine the use of AC20 asphalt affecting the performance of porous asphalt mixes.Specimens were prepared at design asphalt binder content and evaluated for permeability,durability,stability,moisture resistance and the resistance to rutting.
It was found that 9.5mm-NMAS mixtures had better performace than 12.5mm-NMAS and 19mm-NMAS mixtures.For the 12.5mm-NMAS mixtures,fine-graded mixtures had better performance than coarse-graded mixtures.The 12.5mm-NMAS Mixtures not in the specification had the worst performance.
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