Experimental Study on Anti-Permeability of Active Admixture Recycled-Concrete

Abstract:

Active admixture recycled-concrete (AARC) is one of green high performance concretes, which took active admixture and fly ash into recycled concrete to replace part of cement. This paper researches the relationship of seepage resistance grade and chloride diffusion coefficient of recycled concrete by the regressive analysis of experimental data from NEL and gradually pressure method. The mufti-factor (slag powder, fly ash, air-entraining agent, polypropylene fiber, recycled coarse aggregate) and multi-level experiments of anti-permeability of concrete were carried out by orthogonal experiment method, and the optimum proportion of concrete is determined. The results show that seepage resistance grade of 16 groups AARC all reached W13, and chloride diffusion coefficient was between 0.5~1×10^-8cm²/s, the permeability grade is IV. The impermeability of the AARC is excellent. The rate of recycled coarse aggregate and slag powder were the most important factors for the impermeability properties of concrete, the optimum proportion of concrete was 10% slag powder, 20% fly ash, 1/10000 air-entraining agent, 1.0 kg/m3 polypropylene fiber and 40% recycled coarse aggregate.

• Periodical: Applied Mechanics and Materials (Volumes 438-439)
• Pages: 121-124
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.438-439.121
• Online since: October 2013
• Authors: Ai Jiu Chen, Xiao Pei Sun, Fen Yang
• Keywords: Active Admixture, Anti-Permeability, Orthogonal Test, Recycled Concrete

References

[1] S. Yao, Z. Gao, Performance study on the chloride permeability of recycled aggregate concrete, The World of Building Materials, Vol. 31 4 (2010).

[2] X. Wu, J. Yue, Experimental study on chloride ion penetration into recycled aggregate concrete, Journal of Building Materials, Vol. 14 3 (2011).

[3] L. Zhang, B. Liu, B. Hu, Experimental study on the impermeability of recycled concrete, Journal of Hefei University of Technology, Vol. 32 4 (2009).

[4] D. Bretton, J. P. Oliver, G. Ballivy, Diffusivity of chloride ions in the transition zone between cement paste and granite interfaces, in: Proceedings 18th of the RILEM International Conference E＆FN Spon, London, (1992) 269-278.

[5] T. H. Wee, A. K. Suryavanshi, S. S. Tin, Evaluation of rapid chloride permeability (RCPT) results for concrete containing mineral admixtures, ACI Materials Journal, 2 (2000) 221-232.

DOI: 10.14359/827