Abstract
This research intends to evaluate the effects of the waste polyethylene terephthalate (PET), antistripping agents (ASA), and ground tire rubber (GTR) on the performance properties of the stone matrix asphalt (SMA) mix binder/water damage resistance. Liquid antistripping agents, added to 85/100 penetration grade binder to evaluate the ASA effects, were A (M500), B (EvothermM1), and C (LOF‐6500). Tests conducted to study the modified bitumen’s rheological properties included softening point, penetration, rotational viscosity (RV), and dynamic shear rheometer (DSR), and tests performed in order to examine the moisture sensitivity of the modified mix were the Texas boiling and resilient modulus (MR), fracture energy (FE), and indirect tensile strength (ITS) ratio tests. Results showed that the MR, ITS, and FE of asphalt mixes modified with crumb rubber (CR), ASA, and PET were improved. Adding 50% PET, 50% CR, and ASA (B) led to the highest tensile strength, resilient modulus, and fracture energy ratios showing a perfect water susceptibility of the mentioned mix.
Highlights
A major asphalt durability problem caused by the combined water-repeated traffic loading effect leading to structural damage under traffic load is the moisture-caused stripping that occurred when water penetrates between aggregate and bitumen film, decreases the adhesive bond, breaks and separates the asphalt film from the aggregate surface, and eliminates it [1, 2]
Earlier studies had indicated that the polyethylene terephthalate (PET)-/crumb rubber (CR)-modified bitumen has higher resistance to rutting and fatigue cracking compared with the virgin type [30]
An increase in antistripping agents (ASA) (A) increased the softening point and reduced the penetration. e latter occurred when ASAs were used for the PET-/CR-modified bitumen. e greatest reduction was for ASA (B), while the lowest was for ASA (C)
Summary
A major asphalt durability problem caused by the combined water-repeated traffic loading effect leading to structural damage under traffic load is the moisture-caused stripping that occurred when water penetrates between aggregate and bitumen film, decreases the adhesive bond, breaks and separates the asphalt film from the aggregate surface, and eliminates it [1, 2]. Authors of [28] evaluated the ASA effects on the specimens’ water vulnerability and rutting resistance, concluding that adding ASA enhanced their behavior. In [32], the authors studied the combined PET-CR effects on the rheological behavior of the CRcontaining bitumen and showed that adding PET to the CRmodified binder improved the specimen’s viscosity, rutting, and fatigue. Authors of [33] examined the rheological properties of different-percentage PET-CR-modified binders and concluded that the modified outcome enhanced the bitumen’s stiffness, viscosity, and high temperature performance. E present study has used different PET-GTR combinations to modify bitumen and enhance its properties by adding three different ASAs to the PET-/CR-modified bitumen and evaluate its rheological behavior based on the softening point, penetration grade, rotational viscosity (RV), and DSR. The ITS ratio, RMR, and FER parameters were measured to study the SMA’s water vulnerability
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