Title:
Sulfate Resistance of Mortar Bars in Calcium, Magnesium, and Sodium Sulfate Using a Vacuum Impregnation Technique
Author(s):
Federico M. Aguayo, Thano Drimalas, and Kevin J. Folliard
Publication:
Symposium Paper
Volume:
317
Issue:
Appears on pages(s):
1-20
Keywords:
accelerated method, calcium, magnesium, microstructural, sodium, sulfate attack, sulfate resistance
DOI:
10.14359/51700849
Date:
6/1/2017
Abstract:
A number of research studies on chemical sulfate attack have been conducted, and considerable disagreement over the mechanisms still exist. They reveal that several factors can influence the severity and type of attack including the concentration of sulfate ions, pH level, temperature, and the nature of the associated cation. However, the biggest challenge that still remains is a performance test method that can determine the sulfate resistance of cement-based systems within a reasonable timeframe. This laboratory experiment – which was part of an extensive doctoral research program – investigated the use of a new vacuum impregnation technique to accelerate the degradation observed during sulfate attack. The mortar bars were immersed in various sulfate solutions and cation types including sodium, magnesium, and calcium sulfate. The results showed an increased rate of linear expansion from the use of the vacuum impregnation technique when compared to the traditional ASTM C1012 method. However, the measured expansion was significantly influenced by the chemical composition of the binders as well the type of sulfate solution used during testing. The microstructural study revealed that the mechanism of expansion seen when using the vacuum impregnation technique was comparable to mechanisms commonly seen in classic cases of external sulfate attack.
Related References:
1. Aguayo, F. M. (2016). External sulfate attack of concrete: An accelerated test method, mechanisms,and mitigation techniques. Dissertation, The University of Texas at Austin, Civil, Architectural, andEnvrionmental Engineering .
2. Aye, T., & Oguchi, C. (2011). Resistance of plain and blended cement and mortar exposed to severesulfate attacks. Construction and Building Materials , 25 (6), 2988-2996.
3. Bellmann, F., Moser, B., & Stark, J. (2006). Influence of sulfate solution concentration on theformation of gypsum in suflate resistance test specimen . Cement and Concrete Research , 36, 358-363.
4. Bellmann, F., Erfurt, W., & Ludwig, H. -M. (2012). Field performance of concrete exposed to sulphateand low pH conditions from natural and industrial sources. Cement and Concrete Composites, 34, 86-93.
5. Bonakdar, A., & Mobasher, B. (2010). Multi-parameter study of external sulfate attack in blendedcement materials. Construction and Building Materials , 24, 61-70.
6. Bonen, D., & Cohen, D. (1992). Magnesium sulfate attack on portland cement paste - I. MicrostructralAnalysis . Cement and Concrete Reesarch , 22, 169-180.
7. Collepardi, M. (2003). A state-of-the-art review on delayed ettringite attack on concrete. Cement andConcrete Composites , 25, 401-507.
8. Dhole, R. (2008). Sulfate Resistance of HIgh Calcium Fy Ash Concrete. Dissertation , The Universityof New Brunswick, Civil, Architectural, and Envrionmental Engineering .
9. Dolen, T., Scott, G., Fay, K., & Hamilton, B. (2003). Effects of doncrete deterioration on saftey ofdams . Dam Saftey OFfice, Department of the Interior Bureau of Reclamation . Bureau of Reclamation.
10. Drimalas, T. (2007). Laboratory and field evaluations of external suflate attack in concrete.Dissertation, The University of Texas at Austin, Civil, Architectural, and Envrionmental Engineering .
11. Drimalas, T., Clement, C., Follaird, K., Dhole, R., & Thomas, M. (2010). Laboratory and FieldEvaluations of External Sulfate Attack in Concrete. The University of Texas at Austin. Center forTransportation Research.
12. Freeman, R. B., Carraaquillo, R. L. (1995). Production of sulfate-resistant concrete containing highcalciumfly ash and sodium sulfate , ACI-SP 153, 153-176.
13. Gollop, R., & Taylor, H. (1995). Microstrcutral and microanalytical studies of sulfate attack. III.Sulfate-resisting portland cement: reactions with sodium and magnesium sulfate solutions. Cement andConcrete Research , 25 (7), 1581-1590.
14. Gollop, R., & Taylor, H. (1992). MIcrostructural and Microanalytical Studies of Sulfate Attack I:Ordinary Portland Cement Paste. Cement and Concrete Research , 22, 1027-1038.
15. Kunther, W., Lothenbach, B., & Scrivener, K. L. (2013). Deterioration of mortar bars immersed inmagneium containing sulfate soltuions. Materials and Structures , 46 (12), 2003-2011.
16. Leemann, A., & Loser, R. (2011). Analysis of concrete in a vertical ventilation shaft exopsed tosulfate-containing groundwater for 45 years. Cement & Concrete Composites , 33, 74-83.
17. Mehta, P., & Monteiro, P. (2006). Concret: Microstructure, properties and materials (Third Editioned.). New York : McGraw-Hill Companies, Inc.
18. Messad, S., Carcasses, M., & Linger, L. (2010). Performance approach using accelerated test methodfor external sulfate attack. Marine Environmental Damage to Coastal and Historical Structures, (pp.173-186). La Rochelle.
19. Nehdi, M. L., Suleiman, A. R., & Soliman, A. M. (2014). Investigation of concrete exposed to dualsulfate attack. Cement and Concrete Research , 64, 42-53.
20. Neville, A. (1995). Properties of Concrete. Jarlow, UK: Pearson EducationAsia Pvt. Ltd. .
21. Perruchot, C.; Chehimi, M. M.; Vaulay, M. J.; and Benzarti, K. (2006). Characterization of the surfacethermodynamics properties of cement components by inverse gas chromatography at infinite dilution.Cement and Concrete Research, 36, 305-319
22. Santhanam, M., Cohen, M. D., & Olek, J. (2003). Effects of gypsum formation on the performance ofcement during external sulfate attack . Cement and Concrete Research , 33, 325-332.
23. Siad, H., et al. (2016). Preconditioning method for accelerated testing of concrete under sulfate attack.ACI Materials, 113, 493-504.
24. Skalny, J., Marchange, J., & Odler, I. (2002). Sulfate attack on concrete. London: Spon Press.
25. Taylor, H. F., Famy, C., & Scrivener, K. L. (2001). Delayed ettringite formation. Cement and ConcreteResearch , 31 (5), 683-693.
26. Tian, B., & Cohen, M. (2000). Does gypsum formation during sulfate attack on concrete lead toexpansion? . Cement and Concrete Research , 30, 117-123.
27. Tittelboom, K., Belie Ne, N., & Hooton, D. (2013). Test methods for resistnace of concrete to sulfateattack - A critical review. In R. T. PAE, M. Alexander, A. Bertron, & N. Belie De (Eds.), Performanceof cement-based materials in aggressive aqueous environments: State-of-the-Art-Report (pp. 251-288).Springer Netherlands.
28. Whittaker, M., & Black, L. (2015). Currentl knowledge of external sulfate attack. Advances in CementResearch , 27 (9), 532-545.