Sulfate Corrosion and Frost Resistances of Concrete Confined with Engineered Cementitious Composites(ECC)

Engineeredcementitious composites(ECC)-concrete combined components have exhibited specific advantages in terms of mechanical properties. However there currently lacks qualitative and quantitative evaluation of the durability performance of such combined components. In order to study the sulfate corrosion and frost resistance of ECC-concrete combined components,the combined specimens of concrete confined with ECC were prepared through secondary pouring method. The cyclic tests of sulfate drying-wetting alternations and freeze-thaw alternations were carried out on the concrete,the ECC,and the combined specimens. The damage model was established and the service life prediction was performed. Results showed that resistances of the combined specimens to sulfate corrosion and frost were significantly improved compared with the concrete specimen from the perspectives of variations of compressive strength,apparent morphology,and mass loss,and the magnitude of these improvements increased with increasing thickness of ECC. Moreover,the combined specimens maintained apparent status better than the concrete specimen after exposed to environmental erosion,and also had longer predicted service lifetime,especially in the sulfate corrosion environment. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.