Investigation of the APAC (Asphalt-Plastic-Asphalt-Chip-Coated) Water Seepage Barrier.

摘要

The APAC (Asphalt-Plastic-Asphalt-Chip-Coated) water seepage barrier was investigated. Three testing methods were used. The first test evaluated the hydrostatic puncture resistance of the asphalt-polyethylene combination. The second test was that of slope stability of a 3/8in (9.5mm) cover aggregate. This test was designed to determine the displacement characteristics of a cover aggregate as related to slope,temperature,and asphalt residue quantity. The third test was used to determine the overlap seal strength of three available adhesive materials. ASTM test procedures were utilized for this phase of testing. Both asphalt layers in the APAC treatment effectively increased puncture resistance over that of plain polyethylene. The 2:1slope was stable up to a surface temperature of 122F (50C);the 3:1and 4:1slopes remained stable throughout testing. An increase in asphalt spread quantity reduces downslope displacement of the embedded cover aggregate. The Presstite mastic was the best suited adhesive for sealing polyethylene overlaps.