Search

Previous work with Isosorbide Distillation Bottoms (IDB), and other isosorbide and soybean derived materials as additives in polymer-modified warm mix asphalt (WMA) showed that said materials were shown to behave like antistrips in the Hamburg Wheel Tracking Device (HWTD) test when used a dosage of 0.75% by weight of the binder. Because of this evidence, there is an interest in how specimens produced with newly developed isosorbide and soybean bio-derived chemical additives would affect the compaction and dynamic modulus performance of specimens produced at two compaction temperatures (120°C – WMA and 140°C – hot mix asphalt (HMA)) as compared to a control and commercial additives derived from tall oil. There were no statistical differences observed between the additives and the control due to high variability in results for compaction performance, while for dynamic modulus performance only the additive Epoxidized Benzyl Soyate (EBS) performed significantly different from the control and other additives at both compaction temperatures. Only three of the newly developed additives could be identified as WMA additives: Crude Isosorbide (CI), Reactor Product (RP) and Epoxidized Soybean Oil (ESO) based on the number of gyrations and dynamic modulus performance compared to the control group at both compaction temperatures. [ABSTRACT FROM AUTHOR]

A laboratory study was conducted to develop a thin-lift overlay (Thinlay) mix design containing a polymer-modified PG58-34E+ binder with a 3.5% add to the mix, and 40% fine reclaimed asphalt pavement (RAP) that would meet the criteria for the State of Iowa using a bioderived rejuvenator called sub-epoxidized soybean oil (SESO). Two groups of binder and mix specimens were created for this investigation: (1) a control with no SESO, and (2) a rejuvenated group with 0.28% SESO by total mix weight (4.88% by total binder content-RAP binder + PG58-34E+), where the binder groups were evaluated using the multiple stress creep recovery (MSCR) test and bending beam rheometer (BBR), while the mix groups were evaluated using rutting, low-temperature, and fatigue performance tests. Binder results showed that the optimal dosage of SESO must be higher than 8% to achieve a PG46-46E+ to account for RAP inclusion in the mix design. Binder performance had a significant effect on low-temperature mix and fatigue performance, while rutting performance was found to be acceptable for the rejuvenated group. [ABSTRACT FROM AUTHOR]

ABSTRACT: Over the past decade, the development of various monomers and polymeric materials from renewable natural resources has received increasing attention. Soybean oil, as one of the most abundant vegetable oils, has been widely used in recent studies. To enhance the reactivity of pure soybean oil, it can undergo through different processes such as acrylation and epoxidation. In this article, we investigated the viability of polymerized acrylated epoxidized soybean oil (PAESO) in the composition of pressure sensitive adhesives (PSAs). We studied the physical and rheological properties of PSAs composed of poly(styrene‐b‐AESO), and five different tackifiers and three plasticizers. To verify the compatibility of the tackifiers with the biopolymer, a library of 15 PSAs was prepared through solvent blending method and tested by differential scanning calorimetry. The viable formulations were then prepared through hot‐melt blending and characterized using 180° peel tester, and advanced rheometric expansion system. Results showed that the combination of an ester of hydrogenated rosin and a high solvating plasticizer with the synthesized biopolymer indicated best performance relative to other formulations. The comparison of this candidate with its petroleum‐based counterpart containing SIS demonstrates promising potential of the material to perform as well as commercialized PSAs. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46618. [ABSTRACT FROM AUTHOR]

Abstract: In this article, we investigate the role of triacylglycerol composition on the properties of epoxidized vegetable oils and the kinetics of the epoxidation process under conditions comparable to commercial epoxidation. Commodity soybean oil (24% oleic acid, 50% linoleic acid, and 7% linolenic acid), high‐oleic soybean oil (75% oleic acid, 8% linoleic acid, and 2.5% linolenic acid), and linseed oil (11% oleic acid, 15% linoleic acid, and 64% linolenic acid) were each epoxidized to various extents. Epoxidation rate, viscosity, differential calorimetry, and X‐ray diffraction data are presented for these oils and interpreted in the context of their fatty acid profile (mostly oleic, linoleic, or linolenic). While fully epoxidized soybean oil is widely commercially available and used in an increasing array of industrial applications, information relating to partially epoxidized oils and epoxidized oils of other cultivars is less well known. [ABSTRACT FROM AUTHOR]

[Display omitted] • Sub-epoxidized soybean oil (SESO) reacts with oxidized asphaltenes. • SESO-grafted asphaltenes restore ductility to low quality and recycled asphalt. • Reactive rejuvenators facilitate reductions in cost, energy, and emissions. Here we report the chemical passivation of agglomerated asphaltenes in low-quality asphalts and reclaimed asphalt pavement via epoxidized vegetable oil derivatives. This facilitates the production of new pavements with 45 wt% recycled content and a 30% reduction in cost, energy, and emissions impact over current best practices. Recycled asphalt pavement and low-quality asphalt both represent materials streams with the potential to drastically reduce the energy and emissions footprint of our transportation infrastructure, provided that their poor performance properties can be ameliorated. We show that epoxidized methyl soyate and sub-epoxidized soybean oil act as chemical rejuvenators that reduce the asphaltene content in binder formulations enabling both low-quality asphalt and recycled asphalt pavement fractions far exceeding common usage. We demonstrate that compared to "fluxes", or inert diluents, these bio-based additives show far superior solvency, rheological characteristics, and resistance to cracking as evidenced by both lab-based binder studies and a full-scale demonstration paving project. [ABSTRACT FROM AUTHOR]

Highlights • AESO can be used as an additive in asphalt modification. • AESO decreases viscosity of the neat asphalt binder. • AESO lowers the mixing and compaction temperatures. • AESO reduces the compaction effort of HMA. • LabAESO at high dosages improves resistance against fatigue and thermal cracking. Abstract This investigation examines the modification effect of using two types of acrylated epoxidized soybean oil (AESO) in asphalt binder at various concentration levels. The effects of AESO on rheological performance of neat asphalt binder were evaluated by employing rotational viscosity (RV), dynamic shear rheometer (DSR), and bending beam rheometer (BBR) tests. The results indicate that AESO has positive softening effects on decreasing the stiffness of asphalt binder, thereby reduces viscosity and lowers mixing and compaction temperatures. Moreover, laboratory produced AESO (LabAESO) performs superior to commercial available AESO (ComAESO) in terms of low temperature properties and fatigue life at the same concentration level and shows no separation. These findings suggest that a sufficiently high level of LabAESO is necessary in asphalt modification to dramatically affect rheological properties, and therefore enhance the neat asphalt binder’s resistance to fatigue damage at intermediate temperatures and thermal cracking for cold regions pavement applications. Overall, LabAESO shows the potential to be used in asphalt modification with desirable performance improvement, and economic and environmental benefits. [ABSTRACT FROM AUTHOR]

• Asphalt binder was modified with sub-epoxidized and poly (acrylated epoxidized) soybean oils. • The undesired properties of recycled asphalt were mitigated with soybean oil-derived modifiers. • The soybean oil-derived modifiers significantly improved the low temperature cracking resistance. • The bio-based polymer significantly improved the high temperature performance. • The bio-based modifiers can have a huge positive impact on the sustainability of pavements. Soybean oil-derived modifiers were used for the improvement of properties of asphalt materials prepared for a pavement demonstration project. The rheological properties of base, biomodified and extracted binders were measured/compared using rheometers. The binder modification resulted in a decrease of 1.2 °C and 2.3 °C in, respectively, the high-and low-temperature grades of base binder, and when the effect of RAP binder was considered, the continuous performance grade (PG) became almost identical with that of base/control binder. Due to the biomodification and the presence of RAP, the binder's elastic recovery (R) increased by 8.0% and its non-recoverable creep compliance (J nr) decreased by 0.13 kPa−1. The tests conducted to evaluate the mechanical performance of the mixtures proved the efficacy of the bio-modifiers used in reversing the undesired effects of reclaimed asphalt pavement (RAP) and improving the performance of asphalt pavements at different temperatures. For instance, the Hamburg wheel tracking (HWT) test results revealed that the presence of bio-modifiers resulted in the increase of stripping inflection point (SIP) by 3619 passes. The disk-shaped compact tension (DCT) test proved the effectiveness of the bio-modifiers used, as these modifiers increased the fracture energy by 113 J/m2. The master curves constructed for the asphalt binders and mixtures indicated an increased stiffness/elasticity at intermediate and high temperatures. [ABSTRACT FROM AUTHOR]