The performances of tps-porous asphalt incorparting tough fix hyper
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Date
2019-06
Authors
Satis Kumar Selvadurai
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Abstract
Porous asphalt (PA) is a special asphalt mixture with air voids of 20% or more. The porosity is essential to the ecological functions of porous asphalt mix, For an example, water drainage, noise reduction, and water purification. However, the PA may expose to premature deteriorations, in terms of rutting, ravelling and void clogging that hindered its popularity on high-speed roadways. The major cause of the ravelling and rutting is the temperature sensitivity and the lack of adhesion of asphalt mortar and aggregates, especially under repeated heavy traffic loading. The purposes of this study are to evaluate the performances of Tafpack-Super (TPS) PA incorporating Tough Fix Hyper (TFH) and to compare the performances with the TPS PA incorporating Tough Fix (TF). Initially, the PA mixes were prepared based on the predetermined mix design, and verified based on the percentage of air voids, permeability, and the connected air voids. Moreover, the mixture performance tests in terms of coatability, mechanical performance, and moisture damage were carried out. The Texas boiling test was conducted to evaluate the stripping potential of uncompacted mixtures. The mechanical performance tests were then performed using Marshall stability test, Cantabro test at various conditions (standard, immersion and ageing), dynamic creep test and Hamburg wheel tracking test. The Hamburg wheel tracking test and three conditioning protocols Cantabro test were performed to assess the resistance of PA mixes towards rutting and ravelling, respectively. Finally, the retained Marshall stability and tensile strength ratio are calculated to determine the resistance to moisture damage. The results showed that TFH could increase Marshall stability, dynamic creep, tensile strength and resistance to moisture damage of mixtures and to compare the performance of TFH and TF. The vi results indicate that the performance of porous asphalt with TFH as anti-stripping agent exhibited a better overall performance as compared to TF.