The Physical Properties Of Aggregate Effects On Emulsified Asphalt Demulsification Speed

At present,China’s highways have entered in the repair and overhaul’sera,Pavement maintenance and repair has been the trend of scial development.An important component of emulsified asphalt as cold pathing material,affecting the performance of pavement quality particularly prominent,and the key is to influence the performance factors of asphalt emulsion demulsification of emulsified asphalt is less,the preparation process,Many factors influence the performance of the aggregate of different emulsified asphalt,This paper mainly through the study of the aggregate surface energy,specific surface area,composition to explore the physical properties of aggregate and demulsification of emulsified asphalt speed correlation.Firstly,select the basic properties of the raw material to be tested,then the basis of raw materials,preparation of emulsified asphalt investigate indoor craft,mainly on the emulsifying equipment,asphalt temperature,the amount of emulsifier,the temperature of liquid soap,soap PH value and the oil-water ratio,to this applies to explore the female,the optimum cation emulsified asphalt prepared,And according to Lambert-Beer’s law and centrifugal-gravity field model established UV spectroscopy and conductivity centrifugal method,emulsified asphalt emulsion-breaking speed of a fast and accurate evaluation.Next,select the country representative Road limestone aggregates,and finally selected three quite different set of limestone material according to the composition and appearance of the gan he di,fifteen biao,xiao he bian.X-ray diffraction analysis were performed to identify the components,the use of capillary rise method and the Young’s theory of aggregate surface energy parameters,using ASAP2020M + C aggregate physical adsorption instrument specific surface area SSA determination in order to determine the aggregate physical characteristics of indicators.Then,using univariate analysis established and selected physical characteristics associated with the aggregate of the best breaking factors:material factor and size factor and orthogonal design through the analysis of material factors,factors in order to study the surface of the particle size of aggregate energy,specific surface area and emulsified asphalt breaking speed association.And through the influence of gray correlation significance was examined.Finally,in order to study the impact of aggregate composition and content of emulsified asphalt breaking speed,the first study on the composition of the reagent aggregate emulsified asphalt breaking speed.On this basis,the use of multiple linear regression,and gray correlation analysis to study the relationship of aggregate composition and content of each component of emulsified asphalt breaking speed impacts.The results show:UV spectroscopy,centrifugal conductivity method can quickly and accurately evaluate the asphalt emulsion breaking speed;Capillary rise method and the Young’s theory can accurately measure and characterize the fine aggregate surface energy parameters,and surface energy parameter derived aggregates not only with aggregate itself,but also with the relevant aggregate particle size,particle size more large surface energy greater;For fine aggregate,surface energy,surface area and other physical characteristics than the impact of emulsified asphalt emulsion breaking speed are positively correlated,that is,the greater the surface energy,the faster the larger specific surface area of emulsified asphalt emulsion-breaking speed,but too gray correlation analysis the less significant factors,namely,the key factors in smaller particle size when the surface energy,the specific surface area is not emulsified asphalt breaking speed;Positive and negative effects on the composition of aggregate emulsified asphalt breaking speeds,and aggregate and asphalt emulsion mixing ratio has nothing to do with the component only aggregate content related,and different components showed correlation with the significance is not the same,specifically,magnesia,alumina content on emulsified asphalt emulsion breaking and showed significant positive correlation and significant influence;Iron oxide,silica content on emulsified asphalt breaking speed significantly,but showed a negative correlation;calcium oxide on emulsified asphalt breaking speed is a positive correlation,but have a less significantly affected.