Based on the investigation of asphalt pavement performance of some advanced standard highways in mountainous area, we find the early damage is much serious and widespread, especially for the rutting on upslope sections. In order to diminish the damage on slope sections of highway in mountainous area, the paper analyzes the driving character of some kinds of vehicles on upslope section. By adopting elastic and plastic theory and finite element analysis method, we establish the mechanics analysis model, which is under the action of vehicles loading, then it can analyzes the stress and strain accurately in highway pavement structure, especially for the shear stress and strain in pavement structure. The paper also presents many lab tests, including dynamic tri-axles test, simple axle creep test and rutting test, to evaluate synthetically the anti-shear strength and shear fatigue character of asphalt mixture. The paper investigates the typical highway sections with early damage in mountainous area, and makes drilling core and gradation analysis tests. Finally, the paper builds the asphalt pavement structure design method for advanced standard highway in mountainous area, and also builds the relevant index system, to improve the pavement performance and make sure the traffic safety. So the paper could afford the technology assistances for advanced highway building in mountainous area.

The research is carried out to explore the technical viability of combining carbon black with natural rubber as bitumen modifier to use in road pavement. The objectives are two folds, firstly to overcome the shortcoming of the mixture production in handling of each material, and secondly is to amplify the advantages of each material as bitumen mofiers. The main aim of this study is develop carbon black, which is pelleted or powdered with natural rubber. It is expected that a blend of the two materials may result in a new modifier, which is easier to handle, and enable in enhancing of the bitumen rheological properties more effectively. The bitumen to be used is pen grade 60 and 80, which are commonly used in Indonesia and Malaysia respectively. The results of a series of experimental results on bitumen and asphalts are discussed.

The durability of asphalt pavements can be greatly influenced by environmental changes. This is particularly true when the daily temperature fluctuation is considerable. High temperatures can soften the asphalt binder and consequently reduce the stiffness of paving mixtures, while low temperatures can stiffen the binder and reduce mix flexibility. This rheological behaviour of bitumen has been acknowledged for a long time. In addition, bitumen age rapidly under significant temperature regimes. Numerous research has been conducted to ascertain the effect of long and short term ageing on asphalt cement, however similar research on ageing of asphalt mixtures is not as extensive. This paper evaluates the influence of anti-ageing additives modified with crumb rubber on asphalt mixtures. Four different binders with and without additives were tested. Asphalt mixtures were compacted using the gyratory testing machine and aged according to the SHRP protocol for short term and long term oven aging. The laboratory investigation involved measurement of resilient modulus on aged and unaged asphalt mixtures. The resistance to ageing was quantified in terms of an increase in stiffness modulus or an ageing index. The latter was defined as the ratio between the stiffness modulus after ageing and the stiffness modulus before ageing. The results indicate that mixtures incorporating crumb rubber and additives exhibits better ageing resistance compared to mixtures without additives. The stiffness modulus of the modified bitumen mixtures increases by less than 50% of its original stiffness, while the corresponding value for the conventional bitumen mixes increases by more then 50% of its original stiffness.

There has recently been an increase in Spain in the interest in the use of rubber tyre dust foe road asphalts.