The Development And Application Of Colored Asphalt Binder

Colored asphalt concrete pavement is conducive to traffic guidance,but also could prevent and control road traffic accidents in an effective way.Colored binder is the main component of colored asphalt concrete.In this paper,a C9 petroleum resin was used as the base material.Distillate oils were used as the softening and blending components,which were chosen from industrial white oil,wax oil and the high aromatic content distillate oil.Then,the colored binder was synthesized and modified by EVA.The prepared colored binder could satisfie the 70#bitumen standard.After that,SBS was used to improve the quality of the colored binder.Its viscosity-temperature performance and rheological properties were studied and compared with two commercial colored binders.Results showed that the addition of EVA and SBS can improve the softening point and penetration of the colorful binder effeciently.The addition of SBS can not only improve its ductility characteristics,but also reduce the temperature sensitivity and make it suitable for wider temperature range application.The binder also has good resistance to deformation and rutting resistance.The emulsification of the colored binder was carried out.Two kinds of emulsifiers were selected from several emulsifiers.Effect of temperature,pH value,the amount of emulsifier and CaCl2 on the storage stability is investigated.The interfacial tension of the soap and the binder was used to explain the experimental phenomenon.Results showed that there are good correlation between the interfacial tension and the storage stability of the emulsified binder.Interfacial tension is the important reason for the stability of emulsified asphalt storage.Appropriate soap temperature,emulsifier dosage and pH value could reduce the interfacial tension of emusion to a value of 4.1 mN · m-1,and the addition of CaCl2 could make the interfacial tension be decreased to less than 3 mN · m-1.Results showed that the interfacial tension should be controlled below 4.5 mN ·m-1 so that the emulsion could meet the five-day stability standard.Orthogonal tests indicated that factors affecting the interfacial tension and storage stability are in an order of,from large to small,emulsifier ZL-D dosage>CaCl2 dosage>pH value of emulsion.Finally,the emulsified binder was mixed with mixture and color aggregates.Slurry seal test of the emusifered binder was carried out.The tested aggregate composition has 200 parts of colorful stone aggregate,7 parts of water,20 parts of emulsified binder,3 parts of cement,4 parts of color powder and 1 part of color paste.Results showed that the mixing time of the aggregate composition was longer than 2 min after adding the toner and the colorant,and road traffic can be opened in 1.5-2h.The emulsified binder and colored aggregate showed excellent adhesion ability,short open traffic time and a low wet track abrasion loss.