| Abstrakt: |
This paper reported the effect of two types of crystalline waterproofing materials (CWPM), namely coating and mixing type, on concrete durability, focusing on reinforcing steel corrosion and the change in concrete microstructure. The application of coating type on concrete specimens follows the manufacturer’s recommendation. For mixing type CWPM, 0.5, 0.8, 1 and 2% by weight of cement (for small, mild, moderate and high doses) were used. All specimens were exposed to 5% NaCl solution by weight, under dry/wet cycles for 168 days. Water permeability, half-cell potential and surface resistivity were measured for concrete durability and corrosion evaluation. The results indicated that while coating type significantly improved corrosion protection, the mixing type performed better, with the 2% dosage yielding best improvement. Microstructure investigation indicated abundance of needle-like crystal structures in both specimen types. This at least partially accounted for permeability and charge pass reduction. |
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