Chloride diffusion in alkali activated concrete

OJEDOKUN, Olalekan and MANGAT, Pal (2016). Chloride diffusion in alkali activated concrete. In: GALVEZ, Jamime C., AGUADO DE CEA, Antonio, FERNANDEZ-.ORDONEZ, David, SAKAI, Koji, REYES, Encarnacion, J.CASATI, Maria, ENFEDAQUE, Alejandro, G. ALBERTI, Marcos and DE LE FUENTE, Albert, (eds.) II International Conference on Concrete Sustainability - ICCS16. Barcelona, Spain, International Center for Numerical Methods in Engineering (CIMNE), 521-531.

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Abstract

The corrosion resistance of steel reinforcement embedded in an alkali activated cementitious material (AACM) developed by Sheffield Hallam University (SHU) is being investigated. Two main initiators of corrosion, chloride diffusion and carbonation are being considered. This paper will present the results of chloride diffusion in the AACM concrete compositions under long term exposure (up to 180 days) by immersion in a 5% sodium chloride solution. Different mix compositions of the AACM concrete (four grades of mixes) suitable for structural application have been selected, representing different concentrations of the alkali activator and different binder and aggregate ratios. Parallel investigations on control samples of normal concrete of similar strength have been conducted. The chloride diffusion profiles with depth have been obtained. The results show a good correlation of chloride diffusion with Fick's second law of diffusion. A general reduction of chloride ion content within the AACM concrete matrix was observed compared to the control samples of normal concrete. Low liquid/binder ratio has a positive impact on strength, shrinkage and chloride diffusion of AACM concrete.

Item Type: Book Section
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Infrastructure Management
Page Range: 521-531
Depositing User: Olalekan Ojedokun
Date Deposited: 04 Oct 2018 08:21
Last Modified: 16 Nov 2018 12:47
URI: http://shura.shu.ac.uk/id/eprint/22470

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