Mechanical Performance Evaluation of EAF Oxidizing Slag Coarse Aggregate in Porous Asphalt Concrete

Abstract

The global temperature increase and extreme climate have significantly influenced human life in the past decade In order to solve the heat island problem it is necessary to find a pavement that can dissipate heat effectively Water-permeable pavement is a good choice In addition to accelerating heat dissipation it also has a good anti-noise effect manages road runoff anti-skid and maintains the functions of driving safety However PAC is used as a material for structural load-bearing layers in roads and the outside generally has concerns about its mechanical performance In addition the effectiveness and performance of asphalt concrete did not have a test method based on material failure mechanics to quantify its failure mode in the past Therefore the purpose of this research is to use the effectiveness test method related to the failure mechanism of asphalt concrete materials to evaluate the effectiveness of the three main material failure modes of rutting cracks and moisture damage The test results found that in the dynamic elastic modulus test the addition of EAF oxidizing slag can effectively increase the strength of asphalt concrete; in the two tests of rutting increasing the amount of EAF oxidizing slag can also effectively increase the resistance of rutting value the higher proportion of addition the better the rutting resistance; and the fracture energy test uses Illinois Flexible Index Test (I-FIT) and Indirect Tension Asphalt Cracking Test (IDEAL-CT) The increase of porosity contributes to the increase of crack resistance; while the addition of EAF oxidizing slag and the increase of asphalt strength reduce the crack resistance; in the effect of moisture damage performance it can be known that the addition of EAF oxidizing slag helps to make up Porous asphalt is vulnerable to water damage due to its large area with the external environment which reduces the impact of water damage and is similar to the density Based on the above performance indicators a 2D quadrant performace map and a 3D performace stereo map are constructed to identify and present the effectiveness of different asphalt concrete materials From the final result it can be known that the oxidation ballast has effectively improved the overall effectiveness evaluation

Date of Award	2021
Original language	English
Supervisor	Shih-Hsien Yang (Supervisor)