Abbas Al-Hdabi
University of Kufa
Iraq
Title: New Developments on Cold Bitumen Emulsion Mixtures Using Supplementary Cementitious Materials
Biography
Biography: Abbas Al-Hdabi
Abstract
Cold Bituminous Emulsion Mixtures (BEMs) means manufacturing of asphalt at ambient temperature using bitumen emulsion as the binder. It has been widely utilised in many countries such as the USA and France. The use and development of BEMs were not brought forward in the UK due to the country’s relatively wet/cold climatic conditions. The major problems with this kind of application are the long curing time required to achieve the necessary performance, the weak early life strength and high air voids content. The full curing in the field of these mixtures may occur between 2−24 months depending on the mixture’s ingredients and weather conditions. This paper reports the mechanical properties and durability of a new cold mix asphalt developed for use in highway and airfield pavement structural layers including surfacing. The filler in the traditional cold BEM under study i.e. 6% limestone dust by mass of aggregate is replaced with different supplementary cementitious materials individually and collectively. Stiffness modulus of cold BEM mixtures increases significantly by replacing the mineral filler with new filler materials, especially in the early curing time (less than 7 days), which is the main disadvantage of the cold BEMs. Also, the target stiffness modulus, which is the ITSM for 100/150 hot asphalt mixtures, was achieved after 4 hours for the produced fast-curing cold BEM under the normal curing method. In addition, this replacement greatly improves the permanent deformation resistance and fatigue life when compared with the control cold BEM and the traditional hot asphalt mixtures.