Browse > Article
http://dx.doi.org/10.12989/amr.2020.9.3.219

Evaluation of protective coatings for geopolymer mortar under aggressive environment  

Rathinam, Kumutha (Department of Civil Engineering, Sri Venkateswara College of Engineering)
Kanagarajan, Vijai (Department of Civil Engineering, St. Joseph's College of Engineering)
Banu, Sara (Department of Civil Engineering, Sethu Institute of Technology)
Publication Information
Advances in materials Research / v.9, no.3, 2020 , pp. 219-231 More about this Journal
Abstract
The aim of this study is to investigate the durability of fly ash based geopolymer mortar with and without protective coatings in aggressive chemical environments. The source materials for geopolymer are Fly ash and Ground Granulated Blast furnace Slag (GGBS) and they are considered in the combination of 80% & 20% respectively. Two Molarities of NaOH solution were considered such as 8M and 10M. The ratio of binder to sand and Sodium silicate to Sodium hydroxide solution (Na2SiO3/NaOH) are taken as 1:2 and 2 respectively. The alkaline liquid to binder ratio is 0.4. Compressive strength tests were conducted at various ages of the mortar specimens. In order to evaluate the performance of coatings on geopolymer mortar under aggressive chemical environment, the mortar specimens were coated with two different types of coatings such as epoxy and Acrylic. 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 compressive strength as a result of chemical exposure was considered as a measure of chemical attack and the drop in compressive strength was measured after 30 and 60 days of chemical exposure. The compressive strength results following chemical exposure indicated that the specimens containing the acrylic coating proved to be more resistant to chemical attacks. The control specimen without coating showed a much greater degree of deterioration. Therefore, the application of acrylic coating was invariably much more effective in improving the compressive strength as well as the resistance of mortar against chemical attacks. The results also indicated that among all the aggressive attacks, the sulphate environment has the most adverse effect in terms of lowering the strength.
Keywords
durability; geopolymer mortar; fly ash; Ground Granulated Blast furnace Slag; epoxy; acrylic; compressive strength;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Khatera, H.M. and Abd el Gawaad, H.A. (2015), "Characterization of alkali activated geopolymer mortar doped with MWCNT", Adv. Mater. Res., Int. J., 4(1), 45-61. http://doi.org/10.12989/amr.2015.4.1.045
2 Kotwal, A.R., Kim, Y.J., Hu, J. and Sriraman, V. (2015), "Characterization and early age physical properties of ambient cured geopolymer mortar based on class C fly ash", Int. J. Concr. Struct. Mater., 9(1), 35-43. https://doi.org/10.1007/s40069-014-0085-0   DOI
3 Saloma, Iqbal, M.M. and Aqil, I. (2017), "Sulfate resistance of fly ash-based geopolymer mortar", Proceedings of AIP Conference - 3rd Electronic and Green Materials International Conference, Krabi, Thailand, April.
4 Subekti, S., Bayuaji, R., Darmawan, M.S., Husin, N.A., Wibowo, B., Anugraha, B., Irawan, S. and Dibiantara, D. (2017), "Review: Potential Strength of Fly Ash-Based Geopolymer Paste with Substitution of Local Waste Materials with High Temperature Effect", Proceedings of IOP Conference Series: Materials Science and Engineering - International Conference of Applied Science and Technology for Infrastructure Engineering, Surabaya, East Java, Indonesia, August.
5 Thokchom, S., Ghosh, P. and Ghosh, S. (2009), "Effect of $Na_2O$ Content on Durability of Geopolymer Mortars in Sulphuric Acid.", Int. J.Civ. Env. Eng., 3(3),193-198. ISNI: 0000000091950263
6 Vafaei, M. and Allahverdi, A. (2017), "Durability of geopolymer mortar based on waste-glass powder and calcium aluminate cement in acid solutions", J. Mater. Civ. Eng., 29(10). https://doi.org/10.1061/(ASCE)MT.1943-5533.0002053
7 Katpady, D.N., Takewaka, K. and Yamaguchi, T. (2015), "Development of geopolymer with pyroclastic flow deposit called Shirasu", Adv. Mater. Res., Int. J., 4(3), 179-192. http://doi.org/10.12989/amr.2015.4.3.179
8 Zailani,W.A., Abdullah, M.A., Zarinol, M.M., Razak, R.A. and Tahir, M.M. (2017), "Compressive and bonding strength of fly ash based geopolymer mortar", Proceedings of AIP Conference - 3rd Electronic and Green Materials International Conference, Krabi, Thailand, April.
9 Zhang, P., Zheng, Y., Wang, K. and Zhang, J. (2018), "A review on properties of fresh and hardened geopolymer mortar", Compos. B. Eng., 152(1), 79-95. https://doi.org/10/1016/j.compositesb.2018.06.031   DOI
10 Bashar, I.I., Alengaram U.J., Jumaat, M.Z. and Islam, A. (2016), "Development of Sustainable Geopolymer Mortar using Industrial Waste Materials", Mater. Today Proc., 3(2), 125-129.   DOI
11 Bingol, S., Bilim, C., Atis, C.D. and Durak, U. (2020), "Durability Properties of Geopolymer Mortars Containing Slag", IJST.T.Civ.Eng. (Published online 3rd January 2020) https://doi.org/10.1007/s40996-019-00337-0
12 BS 6699 (1992), Specification for Ground granulated blast furnace slag for use with Portland cement, British Standards Institution; UK.
13 Hameed, A.M., Rawdhan, R.R. and Al-Mishhadani, S.A. (2017), "Effect of various factors on the manufacturing of geopolymer mortar", Arch. Sci., 1(3), 1-8.   DOI
14 Huseien, G.F., Mirza, J., Ismail, M., Ghoshal S.K. and Hussein, A.A. (2017), "Geopolymer mortars as sustainable repair material: A comprehensive review", Renew. Sust. Energ. Rev., 80, 54-74. http://dx.doi.org/10.1016/j.rser.2017.05.076   DOI
15 IS 12089 (1987), Specification for Granulated Slag for the Manufacture of Portland Slag Cement, Bureau of Indian Standards (BIS); New Delhi, India.
16 IS 1727 (1967), Indian Standard Methods of Test for Pozzolanic Materials, Bureau of Indian Standards (BIS); New Delhi, India.
17 IS 3812 (2003), Specification for Fly Ash for use as Pozzolana and Admixture, Bureau of Indian Standards (BIS); New Delhi, India.
18 IS 383 (1970), Specifications for Coarse and Fine Aggregate from natural sources for concrete, Bureau of Indian Standards (BIS); New Delhi, India.
19 Kaur, M., Singh, J. and Kaur, M. (2018), "Synthesis of fly ash based geopolymer mortar considering different concentrations and combinations of alkaline activator solution", Ceram. Int., 44(2), 1534-1537. https://doi.org/10.1016/j.ceramint.2017.10.071   DOI