Abstract
Generally, engineered cementitious composites (ECC) have a high proportion of cement, resulting in substantial carbon dioxide emissions that detrimentally affect their environmental sustainability. In this paper, the industrial waste, extracted titanium tailing slag (ETTS), was employed as a partial replacement for cement in the preparation of high-strength ECC. The experimental results show that recycling ETTS to partially replace cement reduced the generation of portlandite (CH), hydrate calcium silicate (C-S-H) and ettringite (AFt) in the ECC matrix, moreover, the microstructures of ECC matrix was also coarsened, both of the above likely against the gaining of strength of ECC, such as the compressive and tensile strength of ECC were decreased from 88.9 MPa to 10.54 MPa in reference ECC (T0) to 75.6 MPa and 9.25 MPa as the replacement ratio up to 30 %, respectively. In addition, the X-ray diffraction analysis revealed that the ETTS-ECC mixture exhibits diffraction peaks of Friedel's salt, indicating that the hydration products in the matrix have a chemical adsorption effect on chloride ions. Moreover, the tensile strain capacity of ECC was significantly improved to 5.69–6.65 % from 2.81 % in T0 upon the ETTS incorporating, meanwhile, the average width of cracks in ECC was narrowed from 92.8 μm to 74.6 μm. The present findings are anticipated to increase the utilization of this industrial waste and mitigate the environmental impact associated with cement production.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call