Abstract:
Nowadays, asphalt emulsions are becoming more prevalent in roadway constructionbecause they provide energy savings and are environmentally friendly. Therefore thisresearch was set up to formulate the cationic slow-setting asphalt emulsion (CSS-1) tofind a suitable set of operating condition for CSS-1. The parameters studied in thisresearch were: the types of cationic emulsifiers (ASFIER N-460L and REDICOTE Ell); the amounts of cationic emulsifiers used (1.4-1.7 percentages for ASFIER N-460Land 0.6-1.2 percentages for REDICOTE E-11); the amounts of asphalt (60-75percentages); the initial temperature of asphalt (1 10-140 OC); and the speed of the highspeed mixer (900-1000 rpm). The properties of asphalt emulsion tested were: storagestability, settlement, distillation, penetration, ductility and solubility inTrichloroethylene. Storage stability and settlement can be used to indicate stability ofemulsion. Distillation can be used to indicate the proportions of asphalt in the emulsion.Penetration can be used to indicate the hardness of the asphalt residue. Ductility can beused to indicate the distribution of emulsion. Solubility in Trichloroethylene can be usedto indicate the actual amount of asphalt binder.The suitable set of operating condition of CSS-1 obtained was high amounts of cationicemulsifiers used, high amounts of asphalt, high temperature of asphalt, high speed ofmixing and type of emulsifier as REDICOTE E-11. With this suitable set of operatingcondition, the storage stability and settlement values decreased, the average size andstandard deviation of asphalt particles decreased but the number of asphalt particlesincreased. Also, at the operating conditions considered, there seemed to be little effecton the values of distillation, penetration, ductility and solubility in Trichloroethylene.