M oi s t u r e s u s c e p ti bility a n d fa ti g u e p e rfo r m a n c e of h y d r a t e d li m e-m o difie d a s p h al t c o n c r e t e : e x p e ri m e n t a n d d e si g n a p plic a tio n c a s e s t u d y Al-Ta m e e mi, AF, Wa n g, Y, Alb ay a ti, A a n d H a y n e s, BJ h t t p:// dx. doi.o r g/ 1 0. 1 0 6 1/(ASC E) MT.1 9 4 3-5 5 3 3 . 0 0 0 2 6 3 4Ti t l e M oi s t u r e s u s c e p ti bility a n d fa ti g u e p e rfo r m a n c e of h y d r a t e d li m e-m o difie d a s p h al t c o n c r e t e : e x p e ri m e n t a n d d e si g n a p plic a tio n c a s e s t u dy A u t h o r sAl-Ta m e e mi, AF, Wa n g, Y, Alb ay a ti, A a n d H a y n e s, BJ Typ eArticl e U RL This ve r sio n is a v ail a bl e a t : h t ABSTRACT 10 Hydrated lime has been recognized as an effective additive used to improve asphalt concrete 11 properties in pavement applications. However, further work is still needed to quantify the effect of 12 hydrated lime on asphaltic concrete performance under varied weather, temperature and 13 environmental conditions and in the application of different pavement courses. A research project 14 has been conducted using hydrated lime to modify the asphalt concretes used for the applications 15 of wearing (surface), levelling (binder) and base courses. A previous publication has reported the 16 experimental study on the resistance to Marshall stability and the volumetric properties, the 17 resilient modulus and permanent deformation at three different weather temperatures. This paper 18 reports the second phase experimental study for material durability, which investigated the effect 19 of hydrated lime content on moisture susceptibility when exposed to a freeze-thaw cycle, and the 20 fatigue life. The experimental results show an improvement in the durability of the modified 21 asphalt concrete mixtures. Optimum hydrated lime contents for different course applications are 22 suggested based on the series experimental studies. Finally, the advantage of using the optimum 23 mixtures for a pavement application is demonstrated. 24 25
Using polymer to modify asphalt binder for better performance has become popular in pavement engineering, for which to evaluate the effect of polymer addition on the properties of the asphalt concrete is essential for mix design.Conventional mechanical test methods, primarily using bending of beams and indirect splitting, are not only materially and timely costly and labor intensive but also provide no direct information for the viscoelastic and rheological characteristics of the materials. This paper reports a study using direct tensile test (DTT) to evaluate the effect of polymer on both mechanical and rheological properties of modified asphalt concrete. Two types of polymers, which are styrene-butadiene-styrene (SBS), and a mixture of SBS and polyvinyl chloride (PVC), were investigated on two mixes using fine and coarse aggregates, respectively. It has been found that SBS generates improvement for both mechanical and rheological properties of hot mix asphalt concrete. However, using a hybrid mixture of SBS and PVC shows that PVC can further improve the mechanical properties, but deteriorate the toughness of the asphalt concrete. At the end, a simple quadric polynomial model has been proposed to characterize the combined SBS and PVC effects for the sake of the guidance for mix design.
Flexible or asphalt concrete pavement is the paving system most widely adopted all over the world. It has been recognized that there are many different types of the factors affecting the performance and durability of asphalt concrete pavement, including the service conditions, such as: the variation of temperature from mild to extremes and the repeated excessive axle loading as well as the inadequate quality of the raw materials. All of these when combined together are going to accelerate the occurrence of distresses in flexible pavement such as permanent deformation and fatigue cracking. As the result, there has an urgent need to enhance the ability of asphalt concrete mixture to resist distresses happened in pavement. Use of additives is one of the techniques adopted to improve pavement properties. It has been found that hydrated lime might be one of the effective additives because it is widely available and relatively cheap compared to other modifiers like polymers. This paper presents an experimental study of the hydrated-lime modified asphalt concrete mixtures. Five different percentages of the hydrated lime additive were investigated, namely (1, 1.5, 2, 2.5 and 3 percent). The hydrated lime additive was used as partial replacement of limestone filler by total weight of the aggregate. The designed Hot Mix Asphalt (HMA) concretes are for the application of three pavement courses, i.e. Surface, Leveling and Base. These mixtures are designed and tested following Marshall procedure and uniaxial repeated loading to evaluate permanent deformation at different temperatures of 20°C, 40°C and 60°C. The experimental results show that the addition of hydrated lime as a partial replacement of ordinary limestone mineral filler results a significant improvement on mechanical properties and the resistant to permanent deformation of the designed asphalt concrete mixtures.
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