Research On Twist Friable Damage Of Asphalt Pavement

Twist rub loose destruction is one of the pavement disease caused by the wheel twist the asphalt pavement, This kind of disease is more common, but also in the position of the ignored, often been deal with as water damage, pit slot, pits. In the loose screw rolling function serious asphalt concrete pavement, prone to twist rub loose, Aircraft turn turn road and aircraft take-off and landing runway pavement inside of the airport road; in the urban road, auto turning of multiple sections, including road intersection, parking entrance and overpass ramp curve segment, and the road often stretch of water; High-grade asphalt concrete pavement need to be aware of large longitudinal slope road and sharp turn road.By analyzing the causes of asphalt twist rub loose destruction, we can find that the size and ways which by force are different from other diseases, primarily by twist-rub action, which is the crucial different from rutting and water damage. There are three kinds mode in “twist rub loose” destruction of asphalt mixture, they are adhesion damage, cohesive damage and fracture damage, these three failure mode occurred at the same time, But the proportion is not the same, cohesive damage and fracture damage which proportion of these two ways is high.In order to study the twist rub loose of the asphalt mixture, Through the simulation of the wheel on the asphalt pavement twisting effect developed twist loose failure test instrument, formulate the corresponding test method, the corresponding parameters, and the evaluation method of test results. Through the orthogonal experiment the key factors of the test parameters, Made twist loose test parameters for OGFC, SMA, AC three kinds of asphalt mixture.By “twist rub loose” destructive test can insist on asphalt mixture’s performance resistance to twist rub loose damage, Suggests that the higher the quality loss of “twist rub loose”is, the worse of the performance of the mixed material, otherwise the mixture of resistance to twist rub loose damage performance is better. Through “twist rub loose” destructive test of asphalt mixture,we can find that asphalt production source, labeling, aggregate type, lithology, light component content in asphalt mixture, structural type, construction quality,they are all have the influence on resistance to twist rub loose damage.In view of the performance on resistance to twist rub loose damage of the asphalt mixture, the mixture ratio design is improved,which include applicable sections,aggregate index, quality loss of “twist rub loose” damage index, Feasibility suggestion on the verification of mix ratio.