Influence of the Nanomaterials of Kaolin Content on the Chloride Permeability of Cement Mortar

Abstract:

This study investigated the influence of nanokaolin content on the behavior of cement mortar at various curing ages. The fluidity, chloride permeability, bending and compressive strength of cement mortar with various nanokaolin additives were examined. The addition of 0%, 1%, 2%, 3%, 4%, 5% and 6% nanokaolin were taken into consideration. The results showed that the addition of nanokaolin decreases the fluidity of cement mortar, and the fluidity the cement mortar decreases with the increase of nanokaolin additives. It is obtained that the addition of nanokaolin increases both the bending and compressive strength of cement mortar, and with the increase of nanokaolin additives, the bending and compressive strength of cement mortar increase. The addition of 4% nanokaolin can result in a significant low chloride permeability of cement mortar among the seven dosages. The chloride diffusion coefficient of the mortar with the addition of 4% nanokaolin was decreased by 18.93%, 12.68% and 31.05% at 7, 14 and 28 curing days, respectively.

• Periodical: Key Engineering Materials (Volume 730)
• Pages: 406-411
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.730.406
• Online since: February 2017
• Authors: Xiao Yu Guo, Ying Fang Fan*, Kun Yang
• Keywords: Cement Mortar, Chloride Diffusion Coefficient, Fluidity, Mechanical Properties, Nanokaolin

References

[1] W. W. Yang, J. S. Qian, Y. Y. Zhang. Effect of fly ash on frost-resistance and chloride ions diffusion properties of marine concrete. China. Ocean. Eng. 32 (2) 367-377.

[2] L. Abosrra, A. F. Ashour, M. Youseffi. Corrosion of steel reinforcement in concrete under marine environment. Constr. Build. Mater. 15 (5) 460-469.

[3] A. Cheng, R. Huang, J. K. Wu, et al. Effect of rebar coating on corrosion resistance and bond strength of reinforced concrete. Constr. Build. Mater. 19 (5) 404-412.

DOI: 10.1016/j.conbuildmat.2004.07.006

[4] A. Mohamed, A. E. Khaled. Effect of using different types of nano materials on bending strength and compressive strength of high strength concrete. Constr. Build. Mater. 80(1) 116-124.

[5] Saloma, N. Amrinsyah, I. Iswandi, et al. Improvement of concrete durability by nano materials. Procedia. Eng. 125 (2015) 608-612.

[6] G. Ehsan, C. Hugo, J. Eduardo. Critical review on eco-efficient ultra high performance concrete enhanced with nano-materials. Constr. Build. Mater. 101(1) 201-208.

[7] X. D. He, X. M. Shi. Chloride permeability and microstructure of Portland cement mortars incorporating nanomaterials. Transp. Res. Rec. (2070) 13-21.

DOI: 10.3141/2070-03

[8] N. A. Tregger, M. Pakula, S. P. EShah. Influence of clays on the rheology of cement pastes. Cement. Concrete. Res. 40 (3) 384-391.

DOI: 10.1016/j.cemconres.2009.11.001

[9] M. S. Morsy, S. H. Alsayed, M. Aqel. Effect of nano-clay on mechanical properities and microstructure of ordinary Portland cement mortar. I. J. C. E. E. 10(1) 23-27.

[10] Y. F. Fan, S. F. Zhang, S. H. Kawashima, et al. Influence of kaolinite clay on the chloride diffusion property of cement-based materials. Cem. Concr. Comp. 45 (2014) 117-124.

DOI: 10.1016/j.cemconcomp.2013.09.021

[11] R. E. Dhir, M. El-Mohr, T. D. Dyer. Developing chloride resisting concrete using PFA. Cement. Concrete. Res. 27 (11) 1633- 1641.

DOI: 10.1016/s0008-8846(97)00146-4

[12] L. P. Tang, N. Lars-Olof. Rapid determination of the chloride diffusivity in concrete by applying an electrical field. Aci. Mater. J. 89(1) 49-53.

[13] L. Senff, A. Joao, M. F. Victor, et al. Effect of nano-silica on rheology and fresh properties of cement pastes and mortars. Constr. Build. Mater. 23(7) 2487-2491.

DOI: 10.1016/j.conbuildmat.2009.02.005

[14] GB/T 2419-2005. Test method for fluidity of cement mortar. In: Chinese standard, (2005).

[15] JTGE-30. 2005. Test methods of cement and concrete for highway engineering. In: Chinese standard, (2005).

[16] GB/T50082-2009. Standard for test methods of long-term performance and durability of ordinary concrete. (2009).