Effect of Residual Asphalt Content on Creep Strain of Cement Modified Emulsified Asphalt Mixtures

Objective of this paper is to determine the rutting performance of residual asphalt content oncement modified emulsified asphalt mixtures at heavy duty highways. For this purpose, emulsified asphaltspecimens with dense graded aggregate were prepared according to Marshall method for emulsified asphaltaggregatecold mixture design. The specimens were prepared in such a way that portland cement wassubstituted for mineral filler in an increased percent from 0 % to 6 %. In this way, three asphalt emulsionmixtures with different residual asphalt contents of 4.2 %, 5.2 %, and 6.2 % by the mass of dry aggregatewere produced. Static load asphalt creep tests were performed on the specimens. Based on the experimentalwork, it has been reached that dense graded cement modified emulsion mixtures are of great performance inrutting compared to hot mixtures with the same aggregate grading and bitumen content. Results showed thatcement acts as a secondary binder in emulsion mixture. Creep and permanent deformation resistance are allimproved by portland cement addition but the resistance to creep deformation of emulsion mixture wasdecreased by the increase of residual asphalt content.