Evaluation of Nano-TiO2 Modified Waterborne Epoxy Resin as Fog Seal and Exhaust Degradation Material in Asphalt Pavement

Abstract

The objective of this study was to investigate the feasibility of TiO2 waterborne epoxy resin as fog seal and exhaust degradation material in asphalt pavement. To achieve this objective, a commercial anatase/rutile mixed-phase nano-TiO2 was added to waterborne epoxy resin at various percentages. Prepared TiO2 coating was characterized with the use of adhesive shear strength test and laboratory photocatalytic performance test, which was performed with a newly developed apparatus for the study of vehicle exhaust decomposition. In addition, the impact of TiO2 coating on skid resistance and permeability of asphalt pavement was analyzed, with the British Pendulum, sand patch method, and pavement permeability test. The results of the experiments indicated that TiO2 waterborne epoxy resin coating was very effective in decomposing NO, HC, and CO pollutants from automobile exhaust. Moreover, application of waterborne epoxy resin as fog seal could maintain the skid resistance and improve the impermeability of the pavement.

Application of Epoxy‐Asphalt Composite in Asphalt Paving Industry: A Review with Emphasis on Physicochemical Properties and Pavement Performances

“…e BPN value of nano-TiO 2 modified EAM was compromised and it was attributed to decreased fluidity of WER, leading to more macrotexture covered and thus lower BPN value [87]. Open-graded mixture with EA had lower BPN value than that of open-graded mixture with conventional PG 64-16 [94], which was consistent with friction coefficient results from dynamic friction tester at low slip speeds [94,154].…”

“…WER, or water-based ER, can be prepared by surfactants or attaching hydrophilic polar groups to it, where water is used as a carrying medium rather than solvent [86]. WER has also been used as fog seal when modified with nano-TiO 2 to degrade vehicle exhaust [87], microsurfacing to improve the performance and durability [88], tack coat to mitigate pavement shoving at bridge deck [89], performance enhanced tack coat when blended with styrene-butadiene rubber (SBR) [63], prime coat for cement treated base (CTB [64]), a high-performance cold binder for cold recycling or cold-mix paving due to its superior adhesion, strength, and fatigue life [90], and cold patch materials [91]. EA has been used as a strong waterproof bonding layer for orthotropic steel bridge decks, and attapulgite (ATT) was successfully added to increase its mechanical performances [92].…”

“…e embedded surface mixture in EAbased prime coat indicated superior bonding strength than the common prime coat. Nano-TiO 2 (up to 3%) can improve the adhesive shear strength of WER [87], which can potentially increase the service life of fog seal. Maximum adhesive shear strength was obtained with 3% water-based resin content by using the 45°oblique shear test [63].…”

“…Glass fiber [104] or mineral fiber [105], which was often added for toughness enhancement and draindown prevention, showed negligible effect on the permeability of EAM. e impermeability of the underlying pavement layer can be significantly improved after WER was used as either prime coat [64] or fog seal modified with nano-TiO 2 [87], which can prevent water from penetrating down into the pavement. Impermeability of the tack coat layer has been evaluated by using the water tightness test, and no seepage was observed for EAR, ARPmodified EAR, and EA under pressure up to 300 kPa [61].…”

Mechanical Response and Structure Optimization of Nanomodified Asphalt Pavement

“…Hu et al formulated thermochromic hot-mixing asphalt (HMA) mixture by doping thermochromic powder and/or nano-TiO 2 scatters at different concentrations into traditional asphalt mixture [10]. Hu et al investigated the feasibility of TiO 2 waterborne epoxy resin as fog seal and exhaust degradation material in the asphalt pavement by adding a commercial anatase/rutile mixed-phase nano-TiO 2 [11]. Li et al investigated the effects of surface-modified inorganic nanoparticle nano-ZnO on the physical and ultraviolet aging resistance of bitumen as well as the microstructures of the binders [12].…”