in this study, different contents of nano-silica, 2 wt.%, 4 wt.% and 6 wt.%, have been added to bitumen tomodify the physical, mechanical and rheological properties of warm mix asphalt (wma). wma iscontaining 2 wt.% of sasobit (mixture of long-chain hydrocarbons). various quality control tests have beencarried out to characterize the modified bitumen and wma. the rheological investigations show...

PROBLEM STATEMENT When designing and evaluating asphalt pavements, engineers must have an understanding of how the pavement materials will react to the stresses and strains of vehicle loads at varying temperatures. When a load is applied to asphalt concrete at a certain temperature, to what degree will the pavement "bounce back" to its original height? Pavement designers predict this spring-lik...

This paper investigates the effect of loading level and loading rate on the damage development and strength on the asphalt mixtures tested at three low temperatures. The current AASHTO specification for asphalt mixture low-temperature characterization consists of two tests: the indirect tensile creep (ITC) test and the indirect tensile strength (ITS). In the ITC, the load was applied until the ...

Methods of preparing test specimens in laboratories are particularly important. It also holds true in terms of compaction procedure in predicting pavement performance. The currently available laboratory compactor cannot adequately replicate field compaction conditions, especially the Stone Mastic Asphalt (SMA) mixture. The essential element of SMA mixture comprises of stones that are placed nex...

Asphalt pavement accounts for ~87% of the overall in Korea. However, owing to black surface and extensive cover area, ambient temperature rapidly increases, thereby contributing urban heat island effect. Therefore, materials with modified porosity conditions have been developed; however, studies on heat-related characteristic values such are insufficient. In this study, thermal characteristics ...

This paper aims to determine the Marshall properties of Asphalt Concrete-Wearing Course (AC-WC) and Hot Rolled Sheet-Wearing (HRS-WC) with utilization concrete waste also percentage added into AC-WC HRS-WC as substitute for coarse aggregates. During manufacture asphalt mixtures, aggregates, fine aggregates are required in large quantities. To reduce fresh mixtures road pavement, has become an a...

Stability is a measure of the strength an asphalt mixture in resisting deformation due to loading. If road construction structure cannot withstand existing load, it will result damage that endangers users. This study aims improve stability concrete with use crumb rubber. Crumb rubber used because has good resistance and elasticity. The research was conducted experimentally by making test object...

To solve the problem of rutting and fatigue damage to asphalt pavement, rutting and fatigue performances of Qingchuan rock asphalt modified asphalt were studied, based on the dynamic shear rheometer test, the dynamic creep test, the rutting test, the indirect tensile fatigue test, the small-sized acceleration loading test, the compressive resilient modulus test, the BISAR3.0 Program and the rut...