Research On Preparation Of Emulsified Asphalt Of High Concentrations And Performance Of Emulsified Asphalt Mixture

The solid content of emulsified asphalt is low at present, especially for emulsifiedasphalt mixture.This situation will cause the poorer pavement performance, such as lowinitial strength, long forming time and high porosity, and that leads the range of applicationsis limited, so the development of a high concentration, excellent performance of emulsifiedasphalt is imminent.In order to prepare a good storage stability of semi-solid emulsified asphalt of highconcentrations through selecting good compatibility emulsifier, stabilizer and other additives,the solid content of emulsified asphalt is greater than70%.On the basis of the research ofordinary emulsified asphalt of high concentrations, emulsified asphalt’s performance has beensignificantly improved by mixing SBS modifier latex. all the optimal values of the maininfluencing factors of emulsified asphalt were given by Orthogonal test, using differentindicators to show the rationality of this proposal, its performance indicators meet theTechnical Specifications for Construction of Asphalt.In order to study the pavement performance of modified emulsified asphalt with highconcentrations, AC-13I is used for mixture design, the optimum asphalt content is5.8%. Hottemperature curing conditions, the Marshall stability maximum of modified emulsifiedasphalt mixture is11.87kN, base asphalt mixture is8.71kN,the former is more than thelatter.The property of modified emulsified asphalt with high concentrations is compared withthat of ordinary emulsified asphalt of high concentrations and emulsified asphalt of lowconcentrations, in the same conditions, analyzing the pavement performance of a variety ofemulsified asphalt mixture through marshall stability, residual stability and freeze-thawsplitting strength.The results showed that emulsified asphalt of high concentrations aresuperior to emulsified asphalt of low concentrations in strength, water stability and lowtemperature performance. The performance indicators of modified emulsified asphalt are thebest. SBS latex modifiers still played a good modification effect after demulsification.Thewater stability indicators of modified emulsified asphalt mixture is qualified under the optimum asphalt content, validated the results of the mix design further.