Optimization Design and Mechanical Performances of Plant-Mix Hot Recycled Asphalt Using Response Surface Methodology

Abstract

This study aimed to explore the influence of material design parameters on the physical and mechanical properties of recycled asphalt. A Box–Behnken design was employed to determine the optimal preparation scheme for 17 groups of recycled asphalt. The effects of styreneic methyl copolymer (SMC) regenerant content, styrene–butadiene–styrene (SBS)-modified asphalt content, and shear temperature on the mechanical properties of recycled asphalt were analyzed using conventional and high/low-temperature rheological tests. The optimal processing parameters were determined by a response surface model based on multiple response indexes. The results revealed that the SBS-modified asphalt content had the most significant effect on the penetration of recycled asphalt. An increase in SMC regenerant content led to a gradual decrease in the rutting factor, while SBS-modified asphalt content had the opposite effect. The usage of SMC regenerant helped to reduce non-recoverable creep compliance by adjusting the proportion of viscoelastic–plastic components in recycled asphalt. Furthermore, the stiffness modulus results indicated that the addition of SMC regenerant improved the recovery performance of recycled asphalt at a low temperature. The recommended contents of SMC regenerant and SBS-modified asphalt are 7.88% and 150%, respectively, with a shear temperature of 157.7 °C.

RSM based modelling and optimization of Marshall properties of steel-slag and lime-modified asphalt mixtures

“…A second experiment was run to verify the model's predictions based on the ideal projected mix design elements. In Liu et al [39], the error between the predicted and actual values of the asphalt indexes was also found to falls within an acceptable range.…”

Characterization, Applications and New Technologies of Civil Engineering Materials and Structures

“…Pan et al investigated the storage stability of crumb rubber asphalt with epoxidized soybean oil and polyester fiber based on the response surface methodology [3]. Liu et al explored the influence of material design parameters on the physical and mechanical properties of recycled asphalt to determine the optimal processing parameters using response surface methodology [4]. Jiang et al presented a comprehensive review of the recent advancements in tunnel grouting materials using industrial solid waste [5].…”

Investigating the Potential of High-Density Polyethylene and Nano Clay Asphalt-Modified Binders to Enhance the Rutting Resistance of Asphalt Mixture

“…The higher the stiffness modulus, the higher the resistance to the deformation under loading. As important predictors of an asphalt-concrete mix's susceptibility to rutting, creep stiffness modulus, four creep aspects-accumulated-axial-strain, creep compliance factors, and creep compliance were identified [55,56] . As stated in Equation ( 2), the accumulated axial strain (Ɛ(t)) is defined as the ratio of the sample deformation (Δh) to its original height (ho) at any given time (t).…”