| 研究生: |
朱柏彥 Chu, Po-Yen |
|---|---|
| 論文名稱: |
骨材級配對排水瀝青混凝土成效之影響 Effect of Aggregate Category on Drainage Asphalt |
| 指導教授: |
蕭志銘
Shiau, Jr-Ming |
| 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: | 2003 |
| 畢業學年度: | 91 |
| 語文別: | 中文 |
| 論文頁數: | 89 |
| 中文關鍵詞: | 排水瀝青混凝土 、骨材級配 |
| 相關次數: | 點閱:71 下載:2 |
| 分享至: |
| 查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
台灣地處亞熱帶,高溫濕熱且多雨,水分若不迅速排除而積貯在鋪面表面,會侵害瀝青混凝土,造成混凝土黏結性喪失,導致剝脫行為發生,進而引起結構破壞,影響鋪面的使用年限。排水性瀝青混凝土採用大量的粗骨材,擁有15%~25%的高孔隙率,因此能將水分迅速排除,因此擁有雨天抗滑、增加行車安全、降低水花飛濺等優點,常為多雨地區的主要選擇。歐美各國已行之有年,使用效果卓著,然台灣尚處研究階段,如何發展一套適合本身的排水性瀝青混凝土是刻不容緩之大事。
本研究採用改質Ⅲ型瀝青,配合ASTM、日本、高公局、瑞典等四種排水級配作為試驗材料,以日本排水性鋪裝技術指針規定之配比試驗,決定各種級配之最佳瀝青含量並製作試體。利用透水試驗、浸水剝脫試驗、加壓浸水剝脫試驗、間接張力試驗、穩定值試驗、車轍輪跡試驗來測試,探討各種級配的力學性質。
根據試驗結果顯示,瀝青混凝土之粗、細骨材比例會影響工程性質之表現,粗骨材偏高,若無足夠之中、細骨材填充,則會導致瀝青混凝土內部摩擦力不夠,致使穩定值下降、抗車轍能力較差;骨材偏細,則會影響其排水功能。此外,瀝青混凝土之滲透性及孔隙率越高,如瑞典級配,由於水分較易侵入瀝青混凝土內部,影響抗剝脫性較為嚴重,此現象可由增加瀝青薄膜厚度或瀝青添加纖維改善。
綜觀試驗結果,可以發現瑞典級配的整體表現最好,原因為粗、細骨材比例適中,有足夠的中、細骨才填充孔隙,使得瀝青混凝土之凝聚力提升,但不會影響排水功能,透水能力最佳;瀝青薄膜厚度足以抵抗水侵害,使得間接張力損失值降低;各篩號之粒料都有,使得瀝青混凝土內部排列成最佳型態,抗車轍能力也最高。
就瀝青黏結料而言,添加纖維雖然可以使抗拉力量上升,但是卻也使瀝青變得具有脆性,進而使得韌性值下降。但若採用瀝青先拌和纖維,再與骨材拌和製作成之試體,則其穩定值會相對提昇,也就是使得瀝青混凝土內部凝聚力變大,抗車轍能力更加;然對間接張力似乎無甚大影響,這可能是因為兩者之破壞機制不同所致。
Taiwan is under sub-tropic zone with high temperature and humid climate. When the asphalt concrete pavement accumulates water will cause the loss of adhesion and cohesion that will produce stripping to affect the durability of asphalt concrete pavement. This will lead to destroy of the structure and decrease the service life of the pavement. Drainage asphalt use large quantity of coarse aggregate, it also has the high percentage air voids from 15% to 25% to displace the water. It is usually the primary choice of the moist region because several advantages like reducing a mist when driving and noises, preventing to hydroplaning in rainy day, increasing driving safety, etc. Although it was used several years in the Europe and the USA with good effects, it is still in research stage in Taiwan. How to develop a suitable drainage asphalt system for ourselves is an important issue. In this study, we use the polymer-modified asphalt and then combine with the Drainage Graded of the USA, Japan, Spanish, and Sweden as experimental materials. First, we use the mix design of The Japan「排水性鋪裝技術指針(案)」to decide the best percentage of asphalt content and then make the mixtures. The mixtures will be evaluated mechanical property by several tests such as Indirect Tension Test、Marshall Stabilometer Test、Wheel-Tracking Test to study the mechanical properties. We expect to find a new category which can use less asphalt content but have higher quality and produce less rutting.
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