Resistance of Concrete Protective Coatings in Different Chemical Environments
DOI:
https://doi.org/10.11113/jt.v74.4627Keywords:
Chemical, protective coating, concrete, resistance, silica fume, epoxy coatingAbstract
The objective of this research study was to introduce concrete protective coatings which provide maximum resistance against chemical attacks. The admixtures-silica fume and fly ash were also used to enhance the impermeability of concrete to a greater extent. Tests conducted at various stages of the curing process allowed us to study the destructive and non-destructive strengths of the specimens. The mortar samples were coated with three different types of epoxy coatings and bitumen. They were then subjected to different chemical environments by immersing them in 10% standard solutions of each ammonium nitrate, sodium chloride and sulphuric acid. Drop in strength as a result of chemical exposure was considered as a measure of chemical attack. This was achieved by measuring the drop in compressive strength after 14 and 28 days of chemical exposure. The compressive strength results following chemical exposure indicated that the samples containing silica fume and fly ash (5% replacement of each by weight of cement) and the protective coating Epoxy-2 (E-2) proved to be more resistant to attacks. The control sample (without admixtures) showed a much greater degree of deterioration. Therefore, the application of E-2 coating in addition to silica fume and fly ash was invariably much more effective in improving the compressive strength as well as the resistance of concrete against chemical attacks. The results also indicated that among all the aggressive attacks, the sulphate environment has the most adverse effect on concrete in terms of lowering its strength.
References
Bhutta, M. A. R., Hassanah, N., Ariffin, N. F., Hussin, M. W., Md Tahir, M., Mirza, J. 2013. Properties of Porous Concrete from Waste Crushed Concrete (Recycled Aggregate). Construction and Building Materials. 47: 1243–1248.
Koji Takewaka and Koji Sakai, 2002. Evaluation Method of Durability in Concrete Structures.
Md Noor N., Yahaya, N., Abdullah, A., Md. Tahir, M., Sing, L. K. 2012. Microbiologically Influenced Corrosion of X-70 Carbon Steel by Desulfovibrio Vulgaris. Advanced Science Letters.13: 312–316.
Mirza, J., Saleh, K., Langevin, M. A., Mirza, S., Bhutta, M. A. R., Md. Tahir, M. 2013. Properties of Microfine Cement Grouts at 4 C, 10 C and 20 C. Construction and Building Materials. 47: 1145–1153.
ASTM C109/C109M-12 Standard Test Method for Compressive Strength of Hydraulic Cement Mortars. http://www.astm.org/Standards/C109.htm.
Environmental Engineering, Faculty of Engineering, University of Waterloo).
ACI Education Bulletin E4-03. CHEMICAL ADMIXTURES FOR CONCRETE. Prepared Under the Direction and Supervision of ACI Committee E-701 Materials for Concrete Construction.
Tayyaba Bibi, Amjad Naseer, Rashid Rehan. 2012. Effect of Ammonium Nitrate on Deterioration of Concrete in the Fertilizer Industry (Justification and Remedies), ACTA International Conference, NUST Islamabad Pakistan.
QCL Group. 1999. Product Data Sheet Edition 7, 2004 Sika Egypt for Construction Chemicals Technical note Page2, March 99. Sulfate Attack and Chloride ion Penetration: Their Role in Concrete Durability.
Mirza, J., Abesque, C., Berube, M. A. 2011. Evaluation of Surface Sealers for Concrete Hydraulic Structures Exposed to Low Temperatures. Materials and Structures. 44: 4–12.
Md. Safiuddin and K. A. Soudki. Accepted 7 September 2011. Sealer and Coating Systems For The Protection Of Concrete Bridge Structures.
Thomas, M. D. A. 1991. Marine Performance of PFA Concrete. Magazine of Concrete Research. 43(156): 171–186.
Sirivivatnanon, V. and Khatri, R. 1995. Munmorah Outfall Canal-Long Term Peformance of Fly Ash Concrete Structures. CSIRO–BCE Report No. BIN080.
Schiessl, P. and Raupach, M. 1989. Influence of Blending Agents on the Rate of Corrosion of Steel in Concrete.Durability of Concrete-Aspects of Admixtures and Industrial By-Products, 2nd Int. Seminar, June 1989, Swedish Council for Building Research, D9.
ASTM C778-12 Standard Specification for Standard Sand http://www.astm.org/Standards/C778.htm.
Downloads
Published
Issue
Section
License
Copyright of articles that appear in Jurnal Teknologi belongs exclusively to Penerbit Universiti Teknologi Malaysia (Penerbit UTM Press). This copyright covers the rights to reproduce the article, including reprints, electronic reproductions, or any other reproductions of similar nature.
