关键词: 道路工程, 湖沥青, 灰分, 填料作用, 改性作用, 比黏附功

Abstract: In order to study the modification mechanism and effect of the ash in the TLA，the influencing factors such as surface and interface parameters of asphalt and aggregate，adhesion work of asphalt mortar system and high temperature rutting factor were analyzed.And the following results were obtained：the surface area of powder ratio and the particle size was inclined to negative correlation; the powder surface energy parameters and the adhesion work of powder asphalt mortar were decreased with the decrease of powder particle size; under the same conditions of ratio of filler to bitumen，the adhesion work of powder in asphalt mortar system was correlative with the surface area.On the basis of the above results，a conclusion is drawn：the specific adhesion work to evaluate the asphalt mortar system is more scientific than the adhesion work; the effect of ash in TLA on the asphalt modification is relatively complex.The ascertained modification mechanism is mainly achieved by the larger specific surface area and the higher adhesion work; meanwhile，the modification of this part is accounted to 15% of ash modification on asphalt，other 85% modification mechanism still needs in-depth study.

Key words: highway engineering, Trinidad Lake asphalt（TLA）, ash, filling effect, modification, specific adhesion work