Study On The Effect Of Acidityon The Set Of Emulsified Asphalt Demulsification Speed

At present,China highways have entered in the repair and overhaul’ s era,Pavement maintenance and repair has been the trend of social development,An important component of emulsified asphalt as cold patching material,affect the performance of pavement quality particularly prominent,and the key is to influence the performance of the emulsified asphalt demulsification,At home and abroad,on the influence factors of asphalt emulsion demulsificationstudy is numerous,but the only study based on aggregate acid-base ondemulsification of emulsified asphalt is less.The preparation process,Many factors influence the performance of the aggregate of different ion emulsified asphalt,this paper focuses on the influence of aggregate alkali on the demulsification of emulsified asphalt.At first,Tesing the basic properties of raw materialsselecteing which is selectd,and then,study on preparation of emulsified asphalt in laboratory on the base of raw materials,mainly study the emulsifying equipment,asphalt temperature,emulsifier amount,soap temperature,PH value and oil-water ratio,In order to explore the best preparation of anionic and cationic emulsified asphalt.Secondly,The four sets of limestone,granite,basalt and quartz are selected for the exploration of the characteristics of acid and alkali of the aggregates,Direct PH measurement,alkali value,aggregate surface zeta potential test,In order to establish the index system of the acid and alkali resistance of the material,the feasibility analysis and verification of the XRD test are carried out directly.Then,through the establishment of the demulsification of emulsified asphalt is relatively simplemodel,and the limestone,granite,quartzite,basalt four aggregate of anionic and cationic asphalt emulsion demulsification research,as the evaluation index of demulsification by centrifugal conductance,as the evaluation index of demulsification by centrifugal conductance,in order to evaluate demulsification speed,the mathematical prediction of the centrifugal Compertz model for conductivity evaluation index data to verify the accuracy.Finally,exploring and analyzing the mechanism of aggregate of different PH values on the demulsification of emulsified asphalt,the gray correlation between the acid base and the index of the aggregate was established by the gray correlation method,Analysis of aggregate electricity and emulsified asphalt has electrical and aggregate PH of emulsified asphalt demulsification mechanism.The results show that:the preparation process is different,because the main difference lies in the dosage of emulsifier according to the different emulsifier.the PH value,alkali value and zeta potential of the aggregate can largely reflect the acid and alkali of the aggregates.aggregate acidity and alkalinity index is equal to chemical composition quality percent and alkalinity index product sum,by gravity and centrifugal field is established from the conductance model which can be fast and accurate evaluation of emulsified asphalt emulsion,the results of the Gonpas mathematical model for the evaluation of the centrifugal conductivity are accurate and feasible,aggregate acidity and alkalinity have effect on cationic emulsified asphalt emulsifying speed,but anionic emulsified asphalt on the contrary,with the aggregate surface Zeta potential and demulsification speed optimal relevance alkali value,and the essence of the collection is the main component of the mineral material,the mechanism of demulsification of pH and the speed of the material in asphalt emulsion is the adsorption relationship between the two.