The engineering properties and fatigue behavior of asphaltic concrete made with waste thread tire rubber modified binders
Başlık çevirisi mevcut değil.
- Tez No: 400576
- Danışmanlar: PROF. J. G. CABRERA
- Tez Türü: Doktora
- Konular: İnşaat Mühendisliği, Civil Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1996
- Dil: İngilizce
- Üniversite: University of Leeds
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 297
Özet
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Özet (Çeviri)
Poor performance and premature failure of some bituminous mixtures have led many field engineers to find out new materials. To improve the performance of bitumen and to increase the service life of bituminous mixtures, additives have been incorporated to change the characteristics of the bitumen and bituminous mixtures. The disposal of scrap tyres, on the other hand, is an increasing environmental problem. In recent years, the most overlooked aspect of rubber modified asphalt is the attention to the ecological problems of disposing of discarded tyres. Moreover the properties of rubbers are in good relevant with the problems in pavement design. To find a usage to the waste rubber in pavement will achieve those problems together. Many advantageous of incorporating rubber into the pavement have been reported. However, structured studies which deal with the long term performance and durability of asphaltic concrete made with rubber-modified bitumen are not available. Because of the lack of information, a need exists to evaluate the effects of mix ingredients in terms of engineering properties. This laboratory study examined the effect of shredded vulcanised tyre rubber on the rheology of the rubber bitumen blends and their influence on the engineering properties and fatigue behavior of asphaltic concrete made with crushed limestone, which the gradation of aggregate was selected on the basis of minimum porosity, and ordinary Portland cement as a filler. Rheological measurements were performed using a Carri-Med CSL500 controlled stress rheometer. The Leeds Design Method was used to predict the effect of shredded tyre rubber on the engineering properties of asphaltic concrete. A new porosity measuring apparatus - Leeds Vacuum Porositymeter (LVP)- for the bituminous mixture was introduced. Fatigue behavior was examined using an INSTRON controlled sinusoidal stress fatigue testing machine. Results of the tests have shown that the addition of rubber imparts the elastic behavior of the binder. This leads an increase on the porosity of the mixture. It is an undesirable result for the bituminous mixtures. An improvement is needed on the compaction method of shredded tyre rubber modified asphaltic concrete.
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