摘要

瀝青混凝土中，粒料體積約佔90%，對鋪面材料強度及耐久性有甚大的影響，而粒料中粗骨材性質對瀝青混凝土成效影響更是顯著。本研究針對粗骨材性質中的細長比和篩號大小的關係，做一相關試驗和探討。
本試驗選出兩種具有代表性的骨材級配，將不同粗骨材篩號中的骨材用細長比偏高的同篩號骨材取代，由細長骨材在不同的篩號為變因，觀察變因對瀝青混凝土的影響。
試驗結果發現，在固定同一比例的細長骨材含量，細長骨材在骨材主要連鎖架構的篩號中，會使瀝青混凝土整體間接張力、抵抗車轍輪跡能力下降最明顯。

使用細長骨材取代塊狀顆粒骨材，在標稱粒徑為１吋的公路總局IVC密集配中瀝青混凝土中， 3/8英吋號篩的細長骨材會使整體強度下降得最明顯，其次是1/2英吋號篩，再來才是3/4英吋號篩；而在標稱粒徑為１吋的石膠泥瀝青混凝土(SMA)中，1/2英吋號篩的細長骨材使瀝青混凝土強度下降最明顯，再來是3/4英吋號篩細長骨材，最後才是3/8英吋號篩細長骨材。這代表IVC密級配的主要連鎖骨材篩號為3/8英吋；SMA級配的主要連鎖骨材篩號為1/2英吋。
本試驗經由統計分析，也再確定較高的細長骨材含量，對瀝青混凝土成效影響越大。經由不同的檢驗方法，也發現以同樣的瀝青膠結料製作試體，級配種類和粗骨材的形狀性質均會對瀝青混凝土材料強度產生影響。

Abstract

It has long been believed that coarse aggregates that have a flat and elongated shape are detrimental to the properties of hot-mix asphalt. With the flat and elongated shape coarse aggregates increase, it is believed that the pavement performance decreased. It was attempted to explain if the performance of asphalt concrete was influenced by the flat and elongation property of coarse aggregates with different sieve sizes.
Two kinds of coarse aggregates ware selected, one was cubic shape and the other was elongated shape. With the same weight percentage but different sieve sizes, mixed in the gradation of SMA and dense gradation.
It was found that for dense gradation, 3/8 " sieve of elongated shape aggregate made asphalt concrete the most weaker. For gradation of SMA, 1/2" sieve of elongated shape aggregate made asphalt concrete weak most obviously.
Results also showed that the more flat and elongated shape coarse aggregates added , the more performance decreased. And the phenomenon was more obviously in the SMA gradation than in the dense gradation.

1. Aho, Brian D.,Vavrik, William R.; Carpenter, Samuel H. "Effect of flat and elongated coarse aggregate on field compaction of hot-mix asphalt," Transportation Research Record, n 1761, 2001, p 26-31
2. Al-Rousan, Taleb ; Masad, Eyad; Myers, Leslie; Speigelman, Cliff ," New methodology for shape classification of aggregates ," Transportation Research Record, n 1913, 2005, p 11-23
3. Barksdale, R.D., Kemp, M.A., Sheffield, W.J., and Hubbard, J.L., “Measurement of Aggregate Shape, Surface Area, and Roughness,” Transportation Research Board 1301, pp.107-116（1992）
4. Brewer R. , “Fabric and Mineral Analysis of Cohesionless Soils”, Wiley, New York (1972).
5. Brown E. R. , Haddock, J. E., “Method to Stone on Stone Contact in Stone Matrix Asphalt Paving Mixtures,” Transportation Research Record 1583, pp.11-18 (1997).
6. Brown, E.R., Haddock, J.E., Mallick, R. B., and Bukowski, J.,”Performance of Stone Matrix Asphalt（SMA）Mixtures in the United States,”Journal of the Association of Asphalt Paving Technologist, Vol.66, pp.426-457 (1997)
7. Hossain, M. Shabbir ; Parker, Frazier; Kandhal, Prithvi S. " Comparison and Evaluation of Tests for Coarse Aggregate Particle Shape, Angularity, and Surface Texture", Journal of Testing and Evaluation, v 28, n 2, March, 2000, p 77-87
8. Jensen, R.P., Bosscher, P.J., Plesha, M.E., and Edil, T.B., “Dem Simulation of Granular Media-Structure Interface：Effects of Surface Roughness and Particle Shape,” International Journal for Numerical and Methods in Geomechanics Int, J. Numer. Anal. Meth, Geomech., Vol.23, pp.531-547（1999）
9. Krumbein, W. C., ”Measurement of Geological Significance of Shape and Roundness of Sedimentary Particles,” Journal of Sedimentary Petrology, Vol.11, pp.64-72 (1941).
10. Lees, G., ”The Measurement of Particle Shape and its Influence in Engineering Materials,” Journal of British Granite and Whinstone Federation, Vol.4, No.2　 (1964).
11. Mahboub, Kamyar C. ; Oduroh, Paul K.; Anderson, R. Michael ," Hot mix asphalt with flat and elongated aggregates," Construction and Materials Issues 2001, 2001, p 183-192
12. Masanori, S. N.,” The Influence of Shape Properties of Crushed Stone Aggregate on Deformation Phenomenon of Asphalt Mixture,” Japan Society of Civil Engineering ,Vol.11, No.408, pp.41- 50 (1989)
13. Oduroh, P.K., Mahboub, K.C., and Anderson, R.M., “Flat and Elongated Aggregates in Superpave Regime,” Journal of Materials in Civil Engineering, pp.124-130（2000）
14. Pettijohn, F. J., Sedimentary Rocks, Harpers and Brothers, News York (1949)。
15. Powers, M. C.,”A New Roundness Scale for Sedimentary Particles,” Journal of Sedimentary Petrology, Vol.23, No.2, pp.117-119 (1953) .
16. Prowell, Brian D. ; Weingart, Randy ," Precisions of flat and elongated particle tests: ASTM D4791 and VDG-40 videograder," Transportation Research Record, n 1673, Oct, 1999, p 73-80
17. Report 425, Designing Stone Matrix Asphalt Mixtures for Rut-Resistant Pavement, NCHRP, USA, 1999
18. Russel, R. D., and Taylor, R. E., ”Roundness and Shape of Mississippi River Sand,” Journal of Geology, Vol.45, pp.225-267 (1937).
19. Stephens, Jack E.; Sinha, Kumares C.,"Effect of Aggregate Shape on Bituminous Mix Character ", Asphalt Paving Technology, v 47, 1978, p 434-456
20. Vavrik, W.R., Fries, R.J., and Carpenter, S.H., “Effect of Flat and Elongated Coarse Aggregate on Characteristics of Gyratory Compacted Samples,” Transportation Research Record 1681, pp.28-36（1999）
21. Wadell, H., “Volume Shape and Roundness of Rock Particles,” Journal of Sedimentary Petrology, Vol.40, pp.443-688 (1932).
22. Wang, L.B., Frost, J.D., and Lai, J.S., “ Noninvasive Measurement of Permanent Strain Field Resulting form Rutting in Asphalt Concrete,” Transportation Research Record 1417, pp.85-94 (1999)
23. Zhu, Han; Nodes, Julie E. ,"Contact based analysis of asphalt pavement with the effect of aggregate angularity ", Mechanics of Materials, v 32, n 3, Mar, 2000, p 193-202
24. Zingg, T., “Bietrahe Zur Schotteranalyse,” Schweiz, Mineral Petrography Mitt., Vol.15, pp.39-140 (1935).
25. 王緒堯，「瀝青混凝土車轍過程中粗粒料之行為分析」，國立成功大學碩士論文，台南（2002）。
26. 江怡廷，「載重作用下瀝青混凝土粗骨材之車轍行為」，國立成功大學碩士論文，台南（2001）
27. 林志棟、鍾權淇、王睿懋「應用數位影像分析探討瀝青混凝土之粒料結構」 第一屆鋪面工 程師生研究成果聯合發表論文集，第96-106頁，中壢，（2000）。
28. 李正中，「粒料性質對瀝青混凝土永久變形之影響」，國立成功大學碩士論文，台南（1999）。
29. 許志淇，「粗粒料骨材性質對瀝青混凝土抗變形之研究」，國立成功大學碩士論文，台南（2001）。
30. 陳虹潔，「骨材顆粒組態及型態對瀝青混凝土抗變形之影響」，國立成功大學碩士論文，台南（2000）。
31. 楊弘健，「骨材級配對瀝青混凝土永久變形之影響」，國立成功大學碩士論文，台南(1998)。
32. 蔡攀鰲，「公路工程學」，國立成功大學土木工程系，台南，(1992)。
33. 蔡攀鰲，「瀝青混凝土材料試驗與配合設計」，三民書局，(1984)。
34. 蔡攀鰲，「瀝青混凝土」，三民書局，台北，(1985)。