Abstract
With the advantage of superior crack width control ability, stress transmission capacity and energy dissipation capacity, engineered cementitious composites (ECC) show ultra-high strain hardening characteristic, and its ultimate tensile strain can reach 3% to 7%, which is hundreds of times that of the normal concrete when cracking occurs. As a new kind of building material, ECC need to get more sustainable through adding vicinal materials. In the present research, we investigate the influence of ternary binder system of bentonite, fly ash (FA) and cement (C) on the mechanical behaviours and microstructures of ECC. The ratio of FA/ C were 1.2, 1.8, 2.4 and the amount of bentonite by mass of ternary binder system were 0%, 5%, 10%, 15%, and 20% in each FA/C ratio, respectively. The flexural strength, flexural deflection capacity and compressive strength were tested at 14, 28 and 90 curing time. The results show that ECC with combined supplementary cementitious materials have the behavior of strain hardening. Moreover, it was found that higher FA/C ratio and higher bentonite content can improve the flexural deflection capacity. In addition, there is a decrease in flexural strength and compressive strength with the increase in FA/C ratio and bentonite content. Furthermore, it could be seen that fly ash and bentonite are beneficial to the long-term strength development of ECC.
Similar content being viewed by others
References
Garvin, S. L. and Hayles, C. S. (1999). “The chemical compatibility of cement-bentonite cut-off wall material.” Construction and Building Materials, Vol. 13, No. 6, pp. 329–341, DOI: https://doi.org/10.1016/S0950-0618(99)00024-0.
Gutowski, T. G., Allwood, J. M., Herrmann, C., and Sahni, S. (2013). “A global assessment of manufacturing: Economic development, energy use, carbon emissions, and the potential for energy efficiency and materials recycling.” Annual Review of Environment and Resources, Vol. 38, No. 1, pp. 81–106, DOI: https://doi.org/10.1146/annurev-environ-041112-110510.
Isaia, G C., Gastaldini, A. L. G., and Moraes, R. (2003). “Physical and pozzolanic action of mineral additions on the mechanical strength of high-performance concrete.” Cement and Concrete Composites, Vol. 25, No. 1, pp. 69–76, DOI: https://doi.org/10.1016/S0958-9465(01)00057-9.
Li, V. C. and Leung, C. K. Y. (1992). “Steady-state and multiple cracking of short random fiber composites.” Journal of Engineering Mechanics, Vol. 118, No. 11, pp. 2246–2264, DOI: https://doi.org/10.1061/(ASCE)0733-9399(1992)118:11(2246).
Li, V. C., Wu, C., Wang, S., Ogawa, A., and Saito, T. (2002). “Interface tailoring for strain-hardening PVA-ECC.” Aci Materials Journal, Vol. 99, No. 5, pp. 463–472, DOI: https://doi.org/10.14359/12325.
Nili, M. and Ehsani, A. (2015). “Investigating the effect of the cement paste and transition zone on strength development of concrete containing nanosilica and silica fume.” Materials and Design, Vol. 75, No.1, pp. 174–183, DOI: https://doi.org/10.1016/j.matdes.2015.03.024.
Pan, Z., Wu, C., Liu, J., Wang, W., and Liu, J. (2015). “Study on mechanical properties of cost-effective polyvinyl alcohol engineered cementitious composites (PVA-ECC).” Construction and Building Materials, Vol. 78, pp. 397–404, DOI: https://doi.org/10.1016/j.conbuildmat.2014.12.071.
Poon, C. S., Kou, S. C., and Lam, L. (2006). “Compressive strength, chloride diffusivity and pore structure of high performance metakaolin and silica fume concrete.” Construction and Building Materials, Vol. 20, No. 10, pp. 858–865, DOI:https://doi.org/10.1016/j.conbuildmat.2005.07.001.
Sahmaran, M. and Li, V. C. (2007). “De-icing salt scaling resistance of mechanically loaded engineered cementitious composites.” Cement and Concrete Research, Vol. 37, No. 7, pp. 1035–1046, DOI: https://doi.org/10.1016/j.cemconres.2007.04.001.
Sha, F., Li, S., Liu, R., Li, Z., and Zhang, Q. (2018). “Experimental study on performance of cement-based grouts admixed with fly ash, bentonite, superplasticizer and water glass.” Construction and Building Materials, Vol. 161, pp. 282–291, DOI: https://doi.org/10.1016/j.conbuildmat.2017.11.034.
Szelag, M. (2018a). “Development of cracking patterns in modified cement matrix with microsilica.” Materials (Basel), Vol. 11, No. 10, pp. 1928–1946, DOI:https://doi.org/10.3390/ma11101928.
Szelag, M. (2018b). “The influence of metakaolinite on the development of thermal cracks in a cement matrix.” Materials, Vol. 11, No. 4, pp. 520–536, DOI: https://doi.org/10.3390/ma11040520.
Turk, K. and Nehdi, M. L. (2018). “Coupled effects of limestone powder and high-volume fly ash on mechanical properties of ECC.” Construction and Building Materials, Vol. 164, pp. 185–192, DOI: https://doi.org/10.1016/j.conbuildmat.2017.12.186.
Wang, S. and Li, V. C. (2007). “Engineered cementitious composites with high-volume fly ash.” Aci Materials Journal, Vol. 104, No. 3, pp. 233–241, DOI: https://doi.org/10.1201/b15883-8.
Wei, F., Grutzeck, M. W., and Roy, D. M. (1985). “The retarding effects of fly ash upon the hydration of cement pastes: The first 24 hours.” Cement and Concrete Research, Vol. 15, No. 1, pp. 174–184, DOI: https://doi.org/10.1016/0008-8846(85)90024-9.
Wong, L. S., Hashim, R., and Ali, F. (2013). “Utilization of sodium bentonite to maximize the filler and pozzolanic effects of stabilized peat.” Engineering Geology, Vol. 152, No. 1, pp. 56–66, DOI: https://doi.org/10.1016/j.enggeo.2012.10.019.
Yang, E. H., Yang, Y. Z., and Li, V. C. (2007). “Use of high volumes of fly ash to improve ECC mechanical properties and material greenness.” Aci Materials Journal, Vol. 104, No. 6, pp. 620–628, DOI: https://doi.org/10.14359/18966.
Acknowledgements
This work was funded by the National Natural Science Foundation (No. 51678480) from China.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Zhao, N., Wang, S., Quan, X. et al. Study on the Coupled Effects of Bentonite and High-Volume Fly Ash on Mechanical Properties and Microstructure of Engineered Cementitious Composites (ECC). KSCE J Civ Eng 23, 2628–2635 (2019). https://doi.org/10.1007/s12205-019-2102-y
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12205-019-2102-y