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Materials 2016, 9(4), 252; doi:10.3390/ma9040252

Permeability of Concrete with Recycled Concrete Aggregate and Pozzolanic Materials under Stress

1
Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China
2
Department of Civil and Environmental Engineering, University of California Berkeley, Berkeley, CA 94720, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Eduardo Júlio
Received: 1 February 2016 / Revised: 28 February 2016 / Accepted: 15 March 2016 / Published: 30 March 2016
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Abstract

The research reported herein studied the permeability of concrete containing recycled-concrete aggregate (RA), superfine phosphorous slag (PHS), and ground granulated blast-furnace slag (GGBS) with and without stress. Test results showed that the chloride diffusion coefficient of RA concrete (RAC) without external loads decreased with time, and the permeability of RAC is much lower than that of the reference concrete due to the on-going hydration and the pozzolanic reaction provided by the PHS and GGBS additives in the RAC mixture. The permeability of chloride under flexural load is much more sensitive than that under compressive load due to the differences in porosity and cracking pattern. At low compressive stress levels, the permeability of chloride decreased by the closing of pores and microcracks within RAC specimens. However, in a relatively short time the chloride diffusion coefficient and the chloride content increased rapidly with the increase of compressive stress when it exceeded a threshold stress level of approximate 35% of the ultimate compressive strength. Under flexural stress, the chloride transport capability increased with the increase of stress level and time. At high compressive and flexural stress levels, creep had a significant effect on the permeability of chloride in the RAC specimens due to the damage from the nucleation and propagation of microcracks over time. It is apparent that mortar cracking has more of a significant effect on the chloride transport in concrete than cracking in the interfacial transition zone (ITZ). View Full-Text
Keywords: chloride transportation; recycled aggregate concrete; compressive stress; flexural stress; pozzolanic additive chloride transportation; recycled aggregate concrete; compressive stress; flexural stress; pozzolanic additive
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wang, H.; Sun, X.; Wang, J.; Monteiro, P.J. Permeability of Concrete with Recycled Concrete Aggregate and Pozzolanic Materials under Stress. Materials 2016, 9, 252.

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