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Research articles

ScienceAsia 36 (2010): 223-230 |doi: 10.2306/scienceasia1513-1874.2010.36.223

Properties of carbonated blast˙furnace slag mortars after Na2FPO3 treatment

Kritsada˙Sisomphon*, O.˙Çopuroğlu, A.L.A.˙Fraaij

ABSTRACT:     This project studies the application of sodium monofluorophosphate (Na-MFP) solution as a surface applied compound for carbonated blast furnace slag mortar treatment against frost salt scaling. A 10% Na-MFP solution was applied on the surface of specimens, and microstructure and frost salt scaling performance were investigated. The results from electron microscopy and nano-indentation showed that the Na-MFP treatment improves the quality of the microstructure and reduces the pore coarsening of the matrix phase. A denser interfacial transition zone can be observed after the treatment. Frost scaling durability of carbonated blast furnace slag mortar has been significantly improved. This method of pre-treatment, which can be applied to the concrete surface during the construction period, would result in the concrete being able to self-heal without the need of a further application later.

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Faculty˙of˙Civil˙Engineering˙and˙Geosciences, Delft˙University˙of˙Technology, Delft, The˙Netherlands

* Corresponding author, E-mail: k.sisomphon@tudelft.nl

Received 30 Nov 2009, Accepted 25 Aug 2010