Evaluation of polymer resin mortars for surface repair of porous asphalt pavements

초록

Porous asphalt pavements provide essential drainage and noise-reduction benefits but are susceptible to surface degradation due to their open-graded structure. This study evaluates three polymer resin mortars-methyl methacrylate (MMA), epoxy, and urethane-for surface-level repair, with emphasis on mechanical performance and permeability retention. MMA was excluded from full testing after preliminary trials showed inadequate polymerisation under ambient conditions. Epoxy and urethane mortars, formulated with No. 4 and No. 5 graded silica sands at 10-14 % binder contents, were tested for flexural and compressive strength, adhesion, and air-void preservation. Epoxy consistently outperformed urethane in strength, achieving maximum average values of 30.5 MPa in compressive strength and 13.56 MPa in flexural strength at 14 % binder. In comparison, urethane reached maximum average values of 5.51 MPa and 2.87 MPa, respectively, across trials for each variation. However in adhesion testing, urethane achieved a peak bond strength of 0.49 MPa, compared to 0.40 MPa for epoxy. Both systems preserved internal voids within the 16.1-18.1 % range. In situ falling-head permeability tests confirmed that epoxy repairs maintained drainage capacity, with head-drop times (15.57 +/- 0.24 s) closely matching those of untreated porous asphalt (15.48 +/- 0.08 s). Overall, epoxy is recommended for high-strength, permeability-compatible repairs in porous pavements, while urethane may be suitable for adhesion-critical applications under moderate loading conditions.

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