Liu Mu-yu

Genetic optimization method of asphalt pavement based on rutting and cracking control

Nowadays asphalt pavement structure bearing is not the main subject for pursuers to study. Comparatively, the pavement performance is more important and emphasized. Based on this, rutting and cracking analysis is introduced into pavement optimization. A optimization model based on these two considerations is also established. The genetic algorithms (GAs) is adopted to solve the model. It is an intellective method. This research provides a new idea and technique for asphalt pavement structure optimization.

Bonding Durability of Two Repair Mortars with Low Modulus Cement and Asphalt Mortar (CA Mortar)

This paper presents the results of a study investigating the bonding performance of two type repair materials, resin mortar (RM) and sulphoaluminate cement-asphalt emulsion mortar (SACR), with substrate cement and asphalt mortar (CA mortar) when repair systems are subjected to freezing-thawing cycles and thermal shock. Double-ring shear tests and three-point bending tests were employed to evaluate the bonding durability for the two repair systems, respectively. Two parameters named “bonding before freezing-thawing” and “bonding after freezing-thawing” were employed to better investigate the bonding durability when repair systems were subjected to freezing-thawing cycles. The results indicate that the thermal expansion coefficient difference between RM and substrate CA mortar is the main cause of their bonding failure. The bonding failure between SACR and substrate CA mortar in the freezing-thawing tests could be related to the decrease in substrate mortar and repair mortar strength. Besides, their bonding showed more stable performance in the thermal shock experiment due to their similar thermal expansion properties.