Study On The Adhesion Performance Of Cement Emulsified Asphalt Mastic

Cement emulsified asphalt mastic is composed by inorganic cement and organicemulsified asphalt,plays a bonding role. In addition, the adhesion of the cement emulsifiedasphalt mortar and aggregate have a impact on the performance of the mixture.The subject using a Brookfield viscometer determinant of the viscosity of emulsifiedasphalt cement mastic in different cement content, at different temperatures and different times,to analyze the variation obtained: Increasing cement ratio to a40%, the viscosity of thecement emulsified asphalt mortar increases, otherwise,the mastic viscosity decreased slightlyand then continue to increaseï¼›the viscosity of cement emulsified asphalt mortar with theextension of the mixing time increased significantly, and the higher the cement ratio,producing more hydration products, in the heating process to accelerate the cement hydration,the agglomeration of particles increases, friction increased between mortar particles, mortarviscosity significantly affected by temperature changes.The DMA tests showed the following rules: Tensile fatigue life of the bond interfacedecreases with the increase of the maximum cycle load stress, when load the same frequency,the same cycle characteristics but different cyclic stress amplitude cyclic stress;Cementhydration products play a reinforced role, when the appropriate amount of cement. Betterinterfacial adhesion, the longer fatigue life; conversely reduced, when the cement ratio morethan40%.By scanning electron microscopy (SEM), electron spectroscopy (EDAX), microscope,alkali content test, Infrared Spectroscopy(IR) and other means of micro-test analysis foundthat: New composite mortar, emulsified asphalt dispersed small particles are adsorbed on thesurface of cement particles. Cement releases the heat of hydration, emulsified asphaltemulsion breaking film formation and release water,both promote each other. Asphaltemulsion breaking film-forming, wrapped hydration products and hydration of cement, part ofthe cement can not be hydration; The higher values of the cement alkali, the greater of theexpansion stress which caused by the alkali silicate gel expansion,resulting in more interfaceadhesion reduced. Aggregate of cement does not affect the change in each phase in theemulsified asphalt cement mortar.Based on the gray entropy associated theory,to sort several major factors which affectthe performance of the cement emulsified asphalt concrete, the results showed that: theamount of cement is the biggest factor on stability of cement emulsified asphalt mixture, static strength, dynamic stability; the age of the main factors affecting the low-temperature cleavagestrength and freeze-thaw splitting strength.