Durability performance evaluation of concrete containing TDFA (Tire Derived Fuel Ash)

In the work, tire ash after coal combustion process is attempted for a binder in construction material. Concrete containing 20% of fly ash (FA) is prepared and the binder is replaced with TDFA (Tire Derived Fuel Ash) from 3.0 to 12.0% by weight. The mechanical and durability performance in the concrete with FA and TDFA are evaluated considering the replacement ratio of TDFA, which is the 1st study on TDFA application to concrete as a binder in South Korea. For the work, various tests are performed for quantitative durability evaluation like compressive strength, carbonation resistance, accelerated chloride diffusion, and freezing/thawing action. In order to investigate pore structure and additionally generated compounds, micro observation tests with MIP (Mercury Intrusion Porosimetry), SEM (Scanning Electron Microscope), and XRD (X-ray Diffraction) are also performed. Despite of replacement of TDFA with high Braine and abundant CaO, concrete with TDFA can provide a reasonable improvement in durability due to packing effect. The durability improvement in FA-based concrete with varying TDFA replacement is comprehensively evaluated and the related mechanism is also studied through micro observation tests.