Properties of Stone Matrix Asphalt Modified with Polyvinyl Chloride and Nano Silica

Abstract

In this study, the effects of polyvinyl chloride (PVC) and nano silica (NS) as modifiers on the properties of stone matrix asphalt (SMA) were studied. The experiment was performed with five modes: 1% NS was mixed into SMA; 5% PVC was mixed into SMA; and the ratio of NS was changed (1, 2, and 3%) with 5% PVC being mixed into SMA. The properties of modified and unmodified SMA materials were determined and compared by performing the penetration test, softening points test, viscosity measurements, dynamic shear rheometry, and multiple stress creep recovery under aging conditions. Moreover, the properties of the modified SMA were also determined in terms of Marshall stability, water stability, and rutting resistance. The obtained results indicate that the physical properties of SMA materials could be significantly improved by using a combination of PVC and NS as a modifier. Moreover, the SMA mixtures modified with PVC and NS exhibited high Marshall stability, good moisture damage resistance, and rutting resistance. Modified SMA mixtures with 5% PVC and 1% NS exhibited the best quality. This research has opened up a new avenue for the development of effective additives for SMA materials.

Engineering Characteristics of SBS/Nano-Silica-Modified Hot Mix Asphalt Mixtures and Modeling Techniques for Rutting

“…The results revealed that TSR of the unmodified HMA specimen was about 79%, while that of 4.5% SBS + 6% NS was about 97%. NS has a very small particle size with a large exposed area; that is why it replaces a large quantity of bitumen and improves the modified bitumen structure [27]. TSR was increased as the percentage of NS was increased up to 4.5% SBS + 6% NS, and then was decreased.…”

“…To examine the responsiveness of the dependent variables (MR) to the modifier and temperature, an experimental design, factorial design was utilized [26][27][28]. A mixture of several factors was used in the experimental design to check the effectiveness of such variables on the response variable.…”