Optimizing the mix design of cold bitumen emulsion mixtures using response surface methodology
Nassar, Ahmed I. and Thom, Nicholas and Parry, Tony (2016) Optimizing the mix design of cold bitumen emulsion mixtures using response surface methodology. Construction and Building Materials, 104 . pp. 216-229. ISSN 1879-0526
Official URL: http://dx.doi.org/10.1016/j.conbuildmat.2015.12.073
Cold mix asphalt (CMA) has been increasingly recognized as an important alternative worldwide. One of the common types of CMA is cold bitumen emulsion mixture (CBEM). In the present study, the optimization of CBEM has been investigated, to determine optimum proportions to gain suitable levels of both mechanical and volumetric properties. A central composite design (CCD) with response surface methodology (RSM) was applied to optimize the mix design parameters, namely bitumen emulsion content (BEC), pre-wetting water content (PWC) and curing temperature (CT). This work aimed to investigate the interaction effect between these parameters on the mechanical and volumetric properties of CBEMs. The indirect tensile stiffness modulus (ITSM) and indirect tensile strength (ITS) tests were performed to obtain the mechanical response while air voids and dry density were measured to obtain volumetric responses.
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