Relationship between microscopic analysis and quantitative and qualitative indicators of moisture susceptibility evaluation of warm-mix asphalt mixtures containing modifiers

Abstract

Given the defects of bitumen in asphalt mixtures particularly exposed to moisture, this study mainly aims to investigate the relationship between qualitative and quantitative results of moisture susceptibility tests on asphalt mixtures modified by ZycoTherm, nanoclay, nanosilica and SBS. The Marshall stability, modulus of resilience and indirect tensile strength tests are carried out. Boiling water and SEM qualitative tests are also used. Eventually, the qualitative tests results are digitalized through image processing by MATLAB and compared with the moisture susceptibility results of indirect tensile strength test. For modulus of resilience testing, the results show that this modifier has the maximum impact on Marshall stability, improving it by about 23%. For moisture susceptibility testing, the nanosilica-modified mixture has the maximum effect among anti-stripping additives, with an improvement by about 20%. An investigation into the results of SEM images and boiling water test via MATLAB indicates the high accuracy of SEM images and their results show the most compatibility with the results of quantitative data.

Evaluation of rheological performance of a local modified bitumen by Styrene Butadiene Styrene polymer used in wearing course

“…The bitumen-polymer mixing phase is critical and largely determines the success of the mixing, for this purpose special attention must be paid during all modification phases. The temperature, time and speed of mixing were chosen based on previous studies established by the researchers [12,28,29,30,31]. Used equipment: -electric propeller agitator (rotation speed = 2000 rpm), -adjustable heating plate, -digital thermometer.…”

Effects of Kortta fibres and microsilica on the mechanical properties of lightweight concrete in oil product environments

“…Latex polymers increase stability by creating a hydrophobic effect or covering the pores [15]. In addition, pozzolanic additives, such as microsilica and nanosilica, act as micro fillers and cement adhesive additives, increase cement density, and reduce pores and permeability [16][17][18][19]. Regarding the effects of nanosilica and microsilica alone and in combination, researchers have shown that the combination of these two additives to the optimal amount in concrete samples increases the compressive strength of the samples in the short and long term.…”