SICAK KARIŞIM ASFALTIN OPTİMUM BİTÜM ORANI ÜZERİNE AGREGA ÖZGÜL AĞIRLIĞININ ETKİSİNİN İNCELENMESİ

Abstract

Bu çalışmada, sıcak karışım asfaltta kullanılan agregaların kökeni ile doğrudan ilişkili olan agrega özgül ağırlığının, sıcak karışım asfaltın optimum bitüm oranı, indirekt çekme dayanımı ve çekme dayanımı oranı üzerine etkisi araştırılmıştır. Bir tür kireçtaşı agreganın özgül ağırlık değerleri Türk Standardı (TS), Amerikan Test ve Malzeme Kurumu (ASTM) ve Amerika Devlet Karayolu ve Ulaştırma İdareleri Birliği (AASHTO) standartlarına göre ayrı ayrı hesaplanmıştır. Karışımlarda tek çeşit kireçtaşı agrega ve 50/70 penetrasyon sınıflı bitüm kullanılmasına rağmen, agregaların özgül ağırlık değerlerindeki farklılıklardan dolayı optimum bitüm oranı, indirekt çekme dayanımı ve nem hassasiyeti açısından farklı değerler elde edilmiştir. Optimum bitüm içerikleri TS, ASTM ve AASHTO standartları kullanılarak sırasıyla %5,03, %4,75 ve %4,59 olarak bulunmuştur. Fayda – maliyet analizine göre farklı standartlar esas alınarak hesaplanan agrega özgül ağırlık değerlerindeki değişimlerin ekonomik fayda sağladığı söylenebilir. Genel olarak sonuçlar, sıcak karışım asfaltta kullanılan bir tür kireçtaşı agregasının özgül ağırlık değerlerinin, karışımların optimum bitüm oranını ve indirekt çekme dayanımını önemli derecede etkilediğini göstermiştir.

Keywords

• Agrega Özgül Ağırlığı
• Superpave
• İndirekt Çekme Dayanımı
• Nem Hassasiyeti

INVESTIGATION OF THE EFFECT OF AGGREGATE SPECIFIC GRAVITY ON OPTIMUM BITUMEN CONTENT OF HOT MIX ASPHALT

Abstract

In this study, effect of aggregate specific gravity, which is directly related to origin of aggregates used in hot mix asphalt on optimum bitumen content, indirect tensile strength and tensile strength ratio of hot mix asphalt, was investigated. Specific gravity (SG) values of one kind of limestone aggregate were calculated according to Turkish Standard (TS), American Society for Testing and Materials (ASTM) and American Association of State Highway and Transportation Officials (AASHTO) standards, separately. Although one kind of limestone aggregate and 50/70 penetration grade bitumen are used in the mixtures, different values were obtained in terms of optimum bitumen content, indirect tensile strength and moisture sensitivity due to differences in the specific gravity values of the aggregates. Optimum bitumen contents were found by using TS, ASTM and AASHTO standards as 5.03%, 4.75% and 4.59%, respectively. According to the cost – benefit analysis, it can be said that changes in aggregate specific gravity values, which were calculated, based on different standards provide economic benefit. Overall, the results indicated that specific gravity values of one kind of limestone aggregate used in hot mix asphalt have significantly affected optimum bitumen content and indirect tensile strength of the mixtures.

Keywords

• Aggregate Specific Gravity
• Superpave
• Indirect Tensile Strength
• Moisture Sensitivity.

References

1. Adiseshu, G.N.P., Naidu, G., 2011. Influence of Coarse Aggregate Shape Factors on Bituminous Mixtures. International Journal of Engineering Research and Applications, 1 (4), 2013-2024.
2. Afaf, A.H.M., 2014. Effect of Aggregate Gradation and Type on Hot Asphalt Concrete Mix Properties. Journal of Engineering Sciences, 42(3), 567-674.
3. Al-Khateeb, G.G., Khedaywi, T.S., Obaidat, T.I.A.S., et al., 2013. Laboratory Study for Comparing Rutting Performance of Limestone and Basalt Superpave Asphalt Mixtures. Journal of Materials in Civil Engineering, 25 (1), 21-29.
4. Ameri, M., Nowbakht, S., Molayem, M., et al., 2016. A Study on Fatigue Modeling of Hot Mix Asphalt Mixtures Based on the Viscoelastic Continuum Damage Properties of Asphalt Binder. Construction and Building Materials, 106, 243-252.
5. Arabani, M., Hamedi G.H., 2011. Using the Surface Free Energy Method to Evaluate the Effects of Polymeric Aggregate Treatment on Moisture Damage in Hot-Mix Asphalt. Journal of Materials in Civil Engineering, 23 (6), 802-811.
6. Arabani, M., Tahami S.A., Taghipoor, M., 2017. Laboratory Investigation of Hot Mix Asphalt Containing Waste Materials. Road Materials and Pavement Design, 18 (3), 713-729.
7. Behiry, A.E.A.E.M., 2013. Laboratory Evaluation of Resistance to Moisture Damage in Asphalt Mixtures. Ain Shams Engineering Journal, 4 (3), 351-363.
8. Bessa, I.S., Branco, V.T.C., Soares, J.B., et al., 2015. Aggregate Shape Properties and Their Influence on the Behavior of Hot-Mix Asphalt. Journal of Materials in Civil Engineering, 27 (7), 04014212.

9. Cui, S., Blackman, B.R., Kinloch A. J., et al., 2014. Durability of Asphalt Mixtures: Effect of Aggregate Type and Adhesion Promoters. International Journal of Adhesion and Adhesives, 54, 100-111.
10. Federal Highway Administration, 2000. Superpave Fundamentals: Reference Manual (FHWA, NHI Course # 131053, 2000).
11. Golalipour, A., Jamshidi, E., Niazi, Y., et al., 2012. Effects of Aggregate Gradation on Rutting of Asphalt Pavements. Procedia-Social and Behavioral Sciences, 53, 440-449.
12. Haghshenas, H.F., Khodaii, A., Khedmati, M., et al., 2015. A Mathematical Model for Predicting Stripping Potential of Hot Mix Asphalt. Construction and Building Materials, 75, 488-495.
13. Hamedi, G.H., Tahami, S.A., 2018. The Effect of Using Anti-stripping Additives on Moisture Damage of Hot Mix Asphalt. International Journal of Adhesion and Adhesives, 81, 90-97.
14. Hesami, S., Roshani, H., Hamedi, G.H., et al., 2013. Evaluate the Mechanism of the Effect of Hydrated Lime on Moisture Damage of Warm Mix Asphalt. Construction and Building Materials, 47, 935-341.
15. Kök, B.V., Çolak, H., 2011. Laboratory Comparison of the Crumb-Rubber and SBS Modified Bitumen and Hot Mix Asphalt. Construction and Building Materials, 25 (8), 3204-3212.
16. Li, J., Zhang, J., Qian, G., et al., 2019. Three-Dimensional Simulation of Aggregate and Asphalt Mixture using Parameterized Shape and Size Gradation. Journal of Materials in Civil Engineering, 31 (3), 04019004.
17. Mahmoud, E., Masad, E., Nazarian, S., 2010. Discrete Element Analysis of the Influence of Aggregate Properties and Internal Structure on Fracture in Asphalt Mixtures. Journal of Materials in Civil Engineering, 22 (1), 10-20.
18. Moreno, F., Rubio, M.C., 2013. Effect of Aggregate Nature on the Fatigue-Cracking Behavior of Asphalt Mixes. Materials & Design, 47, 61-67.
19. Muniandy, R., Aburkaba, E., 2011. The Effect of Type and Particle Size of Industrial Wastes Filler on Indirect Tensile Stiffness and Fatigue Performance of Stone Mastic Asphalt Mixtures. Australian Journal of Basic and Applied Sciences, 5 (11), 297-308.
20. Nejad, F.M., Arabani, M., Hamedi, G.H., et al., 2013. Influence of using Polymeric Aggregate Treatment on Moisture Damage in Hot Mix Asphalt. Construction and Building Materials, 47, 1523-1527.
21. Nejad, F.M., Azarhoosh, G.H., Hamedi, G.H., et al., 2012. Influence of using Nonmaterial to Reduce the Moisture Susceptibility of Hot Mix Asphalt. Construction and Building Materials, 31, 384-388.
22. Ramli, I., Yaacob, H., Hassan, N.A., et al., 2013. Fine Aggregate Angularity Effects on Rutting Resistance of Asphalt Mixture. Journal Teknologi, 65 (3), 105-109.