Modeling of Fatigue-Strength Development in Cold-Emulsion Asphalt Mixtures Using Maturity Method

Abstract

Emulsion asphalts are cost-effective, environmentally friendly, and sustainable alternatives to hot-mix asphalts. Laboratory curing protocols currently used to simulate field curing of emulsion asphalts have been observed to offer conflicting predictions. This study employed the maturity method to account for the combined effects of temperature and time on fatigue-strength development in emulsion asphalts. An emulsion asphalt, composed of 55% reclaimed asphalt pavement, 45% virgin aggregates, 6.2% bitumen emulsion, and 4% pre-mix water was designed following the Asphalt Institute procedure. A total of 168 specimens from the mix were variously cured at 5 °C, 25 °C, 40 °C, and 50 °C for time intervals of 1, 3, 5, 7, 14, 21, and 28 days, before being tested for fatigue-strengths on the four-point bending test jig. It was observed that fatigue-strengths increased with an increase in cure temperature but decreased with an increase in cure duration. A parabolic hyperbolic fatigue-maturity model was developed from results of specimens cured at 5 °C, 25 °C, and 40 °C and validated with results from specimens cured at 50 °C. A strong correlation was observed between predicted fatigue-maturity and laboratory-determined fatigue-strengths at test strain levels between 125 µm/m and 200 µm/m. The study concluded that the laboratory characterization of emulsion asphalts should consider the curing history of the mix.

Impact of curing on the volumetric and mechanical properties of cold bitumen emulsion mix

“…Nowadays it is rapidly used in the prediction of strength of cold bitumen emulsion mix [23,24,56]. In this study, the strength maturity function was developed based on Arrhenius concept by following below steps.…”

Preparation and Performance Assessment of Asphalt Emulsion Modified by the Fabricated SBS Latex

“…Table 3 shows these measurement results of 16 samples which designed according to the orthogonal experiment mentioned above. e orthogonal tests were subjected to a range analysis based on the data in Table 3, which allowed visualizing the primary and secondary factors and the optimal combination as calculated R i value from equation (1).…”

“…Compared with the conventional hot-mix asphalt, asphalt emulsions (AEs) are more energy efficient, environmentally friendly, and cost-effective [1]. erefore, it has been widely used in different pavement applications, such as tack coat, chip-sealing, microsurfacing, and cold asphalt mixtures.…”

Fatigue Cracking Evolution and Model of Cold Recycled Asphalt Mixtures during Different Curing Times

“…The fatigue model, established on the basis of the Weibull distribution, could effectively assess the fatigue life of CRME. Chelelgo et al [11] considered the combined effects of temperature and time on the fatigue-strength development of CRME through four-point bending fatigue tests. A parabolic hyperbolic maturity model was established to predict the fatigue strength of CRME.…”