Influence of Stone Dust in Manufactured Sand on Resisting Chloride Penetration in Marine Concretes

Abstract:

In China, manufactured sand has been widely used as fine aggregate in concrete. Therefore, it is necessary to investigate the effect of manufactured sand on durability of concrete. This research studies the influence of stone dust content in manufactured sand on resisting chloride penetration in marine concrete by strength and other physical mechanical tests, XRD, TGA and pore structure analysis. Test results have shown that the chloride diffusion coefficient increased with increasing the stone dust content in manufactured sand when the stone dust content increasing from 3% to 13%. The stone dust in fine aggregate was participated in hydration procedure of cementitious, which will promote the hydration degree of cementitious and increase the chloride binding capacity of hydration product. The influence of stone dust in fine aggregate on chloride diffusion coefficient were the combined effects of concrete pore structure and cementitious hydration products, and the porosity and pore size distribution were the main factors that influence the changes of diffusion coefficient.

• Periodical: Applied Mechanics and Materials (Volumes 174-177)
• Pages: 1419-1423
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.174-177.1419
• Online since: May 2012
• Authors: Jian Bo Xiong, Peng Ping Li, Sheng Nian Wang
• Keywords: Chloride Diffusion Coefficient, Concrete Pore Structure, Manufactured Sand, Stone Dust Content

References

[1] M.Heikal, H.El-Didamony, M.S. Morsy: Cement and Concrete Composites. Vol.30 (2000), p.1827

DOI: 10.1016/s0008-8846(00)00402-6

[2] J.P. Goncalves, L.M. Tavares, R.D.T;ledo: Cement and Concrete Research. Vol.37 (2007), p.924

[3] Beixing Li, Guoju Ke, Mingkai Zhou: Construction and Building Materials. Vol.25 (2011),p.3849

[4] NT BUILD 443-1995. Concrete, Hardened: Accelerated Chloride Penetration[S]. (1995)

[5] Tang Luping, Lars-olof Nilsson: Cement and Concrete Research. Vol.23 (1993), p.247

[6] G.Kakali, S. Tsivilis, E.Aggeli: Cement and Concrete Research. Vol.30 (2000), p.1073

[7] Yongjuan Zhang, Xiong Zhang: Construction and Building Materials. Vol.22 (2008), p.1634

[8] Li Dongxu, Shen Jinlin, Chen Yimin: Cement and Concrete Research. Vol.30 (2000), p.1381

[9] Sanjay Kumar, Rakesh Kumar, A Bandopadhyay: Cement and Concrete Composites. Vol.30 (2008), p.679

[10] P K Mehta. Concrete in the marine environment (modern concrete technology series). (Taylor& Francis Group, NY, 2003)