PSI - Issue 25

Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Isabella Cosentino et al. / Procedia Structural Integrity 25 (2020) 413–419

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4. Conclusions and future developments

Innovative cementitious composites showed improved mechanical properties compared to conventional cementitious materials: among the others, higher tensile strength, tensile strain hardening, flexural strength, fracture toughness and resistance to fatigue. This paper presents a first part of an ongoing research project which aims to investigate the response of innovative cementitious composites to cyclic uniaxial loading. An experimental set-up was developed to study reversed cyclic compression/tension loadings of innovative cementitious composites. This set-up will allow greater insight into the ductility of innovative cementitious composites. Results from this research will facilitate the investigation of the durability of existing buildings. One next step of research will be the evaluation of the influence of scale effects, testing specimens with different dimensions. Ferro and Carpinteri (2008) analyzed the size effects in compression on drilled cylindrical concrete specimens. Experimental results showed scale effects on dissipated energy density rather than on the compressive strength. The variability and reproducibility of the testing results will be considered by employing a minimum number of three specimens per loading condition. Moreover, the comparison between cored specimens and specimens cast in moulds will be investigated in order to evaluate the disturbing effects of the coring on the resistance measured. In both cases, results will represent a reliable basis for the development of constitutive models suited to numerical simulation in innovative cementitious composites. Cosentino, I., Restuccia, L., Ferro, G.A., Tulliani, J.M., 2019. Type of materials, pyrolysis conditions, carbon content and size dimensions: the parameters that influence the mechanical properties of biochar cement-based composites. Theoretical and Applied Fracture Mechanics 103, 102261. Ferro, G.A., Carpinteri, A., 2008. Effect of specimen size on the dissipated energy density in compression. Journal of Applied Mechanics - ISSN:0021-8936 - 75 (4):041003 Gillani, S.S.U.H, Khitab, A., Ahmad, S., Khushnood, R.A., Ferro, G.A., Kazmi, S.M.S., Qureshi, L.A., Restuccia, L., 2017. Improving the mechanical performance of cement composites by carbon nanotubes addition. Procedia Structural Integrity 3, 11–17. Jun, P., Mechtcherine, V., 2010. Behaviour of Strain-hardening Cement-based Composites (SHCC) under monotonic and cyclic tensile loading: Part 1 – Experimental investigations. Cement and Concrete Composites 32, 801-809 Jun, P., Mechtcherine, V., 2010. Behaviour of Strain-hardening Cement-based Composites (SHCC) under monotonic and cyclic tensile loading: Part 2 – Modelling. Cement and Concrete Composites 32, 810-818 Kesner, K.E., Billington, S.L., Douglas K.S., 2003. Cyclic response of highly ductile fiber-reinforced cement-based composites. ACI Materials Journal 100(5), 381-390. Sobolev, K., Ferrada-Gutiérrez, M., 2005. How Nanotechnology Can Change the Concrete World. ACS Bulletin 10, 14–17. Yoo, D. Y., Banthia N., 2016. Mechanical properties of ultra-high-performance fiber-reinforced concrete: A review. Cement and Concrete Composites 73, 267-280. References