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Open AccessArticle

Experimental Investigation on Pore Structure Characterization of Concrete Exposed to Water and Chlorides

Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China
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Materials 2014, 7(9), 6646-6659; https://doi.org/10.3390/ma7096646
Received: 19 June 2014 / Revised: 31 July 2014 / Accepted: 9 September 2014 / Published: 16 September 2014
(This article belongs to the Section Porous Materials)
In this paper, the pore structure characterization of concrete exposed to deionised water and 5% NaCl solution was evaluated using mercury intrusion porosity (MIP), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The effects of calcium leaching, fly ash incorporation, and chloride ions on the evolution of pore structure characteristics were investigated. The results demonstrate that: (i) in ordinary concrete without any fly ash, the leaching effect of the cement products is more evident than the cement hydration effect. From the experimental data, Ca(OH)2 is leached considerably with the increase in immersion time. The pore structure of concrete can also be affected by the formation of an oriented structure of water in concrete materials; (ii) incorporation of fly ash makes a difference for the performance of concrete submersed in solutions as the total porosity and the pore connectivity can be lower. Especially when the dosage of fly ash is up to 30%, the pores with the diameter of larger than 100 nm show significant decrease. It demonstrates that the pore properties are improved by fly ash, which enhances the resistance against the calcium leaching; (iii) chlorides have a significant impact on microstructure of concrete materials because of the chemical interactions between the chlorides and cement hydrates. View Full-Text
Keywords: pore structure; concrete; deionised water; chlorides; leaching; fly ash pore structure; concrete; deionised water; chlorides; leaching; fly ash
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Liu, J.; Tang, K.; Qiu, Q.; Pan, D.; Lei, Z.; Xing, F. Experimental Investigation on Pore Structure Characterization of Concrete Exposed to Water and Chlorides. Materials 2014, 7, 6646-6659.

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