Abstract
An ultra-lightweight engineered cementitious composite (ECC) mixture has been recently developed as a durable alternative to the conventional cement-based fireproofing material for steel structures. The newly developed mixture has a dry density of 550 kg/m3, yet as a fireproofing material, it shows considerable tensile strength above 1 MPa and tensile strain capacity greater than 2%. This newly developed mixture is much more lightweight than any previously developed ECC material. It uses high tenacity polypropylene (HTPP) fibers as fiber reinforcement; and an acrylic latex based admixture is incorporated into the mix composition. All these leads to significantly different micromechanical properties from all previously developed normal-weight and lightweight ECC mixtures. In this paper, investigations have been conducted to fully understand the unique micromechanics of the newly developed material. Specifically, single fiber pull-out tests were conducted. The test result showed that a cement-polymer co-matrix was formed in presence of the latex admixture. As a result, the interfacial bond between the lightweight matrix and HTPP fibers was significantly enhanced. A scale-linking model was also used to show that such enhanced interfacial bond contributed to an increase of tensile strength and strain-hardening potential. The current research provides useful data for understanding the behavior of lightweight ECC and polymer modified ECC materials and can also serve as a guideline for future development of similar materials.
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References
Felekoglu, B., Tosun-Felekoglu, K., Ranade, R., Zhang, Q., Li, V.C.: Influence of matrix flowability, fiber mixing procedure, and curing conditions on the mechanical performance of HTPP-ECC. Compos. B Eng. 60, 359–370 (2014)
Griffith, A.A.: The phenomena of rupture and flow in solids. Philos. Trans. R. Soc. Lond. 221, 163–198 (1921)
Kanda, T., Li, V.C.: Multiple cracking sequence and saturation in fiber reinforced cementitious composites. Concr. Res. Technol. 9(2), 19–33 (1998)
Li, V.C., Leung, C.K.: Steady-state and multiple cracking of short random fiber composites. J. Eng. Mech. 118(11), 2246–2264 (1992)
Li, V.C., Wu, C., Wang, S., Ogawa, A., Saito, T.: Interface tailoring for strain-hardening polyvinyl alcohol-engineered cementitious composite (PVA-ECC). Mater. J. 99(5), 463–472 (2002)
Lin, Z., Kanda, T., Li, V.C.: On interface property characterization and performance of fiber reinforced cementitious composites. J. Concr. Sci. Eng. 1, 173–184 (1999)
Marshall, D.B., Cox, B.N., Evans, A.G.: The mechanics of matrix cracking in brittle-matrix fiber composites. Acta Metall. 33(11), 2013–2021 (1985)
Yang, E.-H., Li, V.C.: Strain-hardening fiber cement optimization and component tailoring by means of a micromechanical model. J. Constr. Build. Mater. 24, 130–139 (2010)
Zhang, Q., Li, V.C.: Development of durable spray-applied fire-resistive engineered cementitious composites (SFR-ECC). Cement Concr. Compos. 60, 10–16 (2015)
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Zhang, Q., Li, V.C. (2018). Micromechanics of an Ultra Lightweight Engineered Cementitious Composite Containing Polymeric Latex Admixture. In: Mechtcherine, V., Slowik, V., Kabele, P. (eds) Strain-Hardening Cement-Based Composites. SHCC 2017. RILEM Bookseries, vol 15. Springer, Dordrecht. https://doi.org/10.1007/978-94-024-1194-2_8
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DOI: https://doi.org/10.1007/978-94-024-1194-2_8
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