Development of low carbon engineered cementitious composite (ECC) using nano lime calcined clay cement (nLC3) based matrix AITranslate

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DOI：https://doi.org/10.1016/j.cscm.2023.e02669

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Highlights • Nano lime densifies the matrix, which improves the mechanical properties of nLC3 composite. • The micromechanical model of ECC was used to find critical volume fraction of fibers. • The use of nLC3 based ECC can help to lower the carbon footprints by 50%. • The mechanical properties of nLC3 ECC were significantly improved as compared to LC3 ECC. The construction industry is responsible for around 5% of total CO2 emissions globally. As a result, recent research is focused on the sustainability aspects of construction materials. Engineered cementitious Composites (ECC) are high-performance fiber reinforced composites with improved ductility and tensile strength but utilize higher cement content, raising concerns about their sustainability. In this study, nano-lime and calcined clay are combined with cement to develop a high strength sustainable nano lime calcined clay cement (nLC3) based Engineered Cementitious Composite (ECC). Initially, the packing density model was employed to develop a high strength nLC3-based matrix by combining the particle packing models and chemical compatibility while keeping costs to a minimum. Micromechanical modeling was then applied to determine the critical volume of fibers for the novel matrix using single fiber pullout tests and matrix toughness tests. According to the micromechanical model, the critical volume fraction is found to be 1.93% for the nLC3 mix. This was further confirmed by casting dog bone samples containing 2% fibers by volume which confirmed strain hardening response. The uniaxial test results indicated a strength of around 5.85 MPa in tension and 51 MPa in compression with about 3% tensile strain. These results are comparable to conventional ECC and better than previously developed LC3 based ECC. This study reveals that nLC3-based ECC is a more sustainable composite as compared to conventional ECC mix without any compromise on strength and cost.