MSA  Vol.6 No.6 , June 2015
The Impact of Aluminum- and Iron-Bearing Admixtures on the Resistance of Portland Cement Mortars to Alkali-Silica Reaction and Sulfate Attack
ABSTRACT
Study of sulfate resistance of mortars with aluminum- and iron-bearing admixtures (Al(OH)3, Al2(SO4)3, FeSO4, Fe2(SO4)3) in conditions close to those established in ASTM C 1012, and the study of the mitigation effect of these admixtures on alkali-silica reaction in accordance with accelerated “mortar bar” test ( GOST 8269.0, ASTM C 1260) were performed. Iron (II) and (III) sulfates show ability for mitigation alkali-silica reaction, while also, in contrast with Al-bearing substances, do not induce the drastic reducing of the initial setting time and do not promote the progress of sulfate corrosion. Compared with FeSO4, iron (III) sulfate has moderate deleterious impact on the early strength of cement paste and can be of interest alone as an inhibitor of ASR. Iron (II) sulfate may be used together with aluminum sulfate to offset the accelerating effect of the latter on the setting of cement paste and to reduce a risk of sulfate corrosion. During prolonged water storage, the mortar elongation and secondary ettringite formation do not occur, even when Al2(SO4)3 is available. Therefore, the investigated admixtures cannot act as agents of internal sulfate attack, however, Al2(SO4)3 can enhance the outer sulfate attack.

Cite this paper
Brykov, A. , Anisimova, A. , Rozenkova, N. , Hadi, M. and Mokeev, M. (2015) The Impact of Aluminum- and Iron-Bearing Admixtures on the Resistance of Portland Cement Mortars to Alkali-Silica Reaction and Sulfate Attack. Materials Sciences and Applications, 6, 539-548. doi: 10.4236/msa.2015.66058.
References
[1]   Thomas, M.D.A. and Folliard, K.J. (2007) Concrete Aggregates and the Durability of Concrete. In: Page, C. and Page, M., Eds., Durability of Concrete and Cement Composites, CRC Press, New York, 403.

[2]   Thomas, M. (2011) The Effect of Supplementary Cementing Materials on Alkali-Silica Reaction: A Review. Cement and Concrete Research, 41, 1224-1231.
http://dx.doi.org/10.1016/j.cemconres.2010.11.003

[3]   Thomas, M., Fournier, B., Folliard, K., et al. (2007) The Use of Lithium to Prevent or Mitigate Alkali Silica Reaction in Concrete Pavements and Structure. FHWA-HRT-06-133, US Dept. of Transportation, Federal Highway Administration, Washington DC.

[4]   Ramachandran, V.S. (1998) Alkali-Aggregate Expansion Inhibiting Admixtures. Cement and Concrete Composites, 20, 149-161.
http://dx.doi.org/10.1016/S0958-9465(97)00072-3

[5]   Brykov, A., Anisimova, A. and Rozenkova, N. (2014) The Mitigation of Alkali-Silica Reactions by Aluminum- Bearing Substances. Materials Sciences and Applications, 5, 363-367.
http://dx.doi.org/10.4236/msa.2014.56041

[6]   Myrdal, R. (2007) Accelerating Admixtures for Concrete. State of the Art: SINTEF Report N SBF BK A07025, Trondheim.

[7]   Brykov, А., Vasilev, А. and Mokeev, M. (2013) Hydration of Portland Cement in the Presence of Aluminum- Containing Setting Accelerators. Russian Journal of Applied Chemistry, 86, 793-801.
http://link.springer.com/article/10.1134/S1070427213060013

[8]   Brykov, А., Vasilev, А. and Mokeev, M. (2013) The Impact of Aluminum-Containing Set Accelerators on Sulfate Resistance of Portland Cement Compositions. Materials Sciences and Applications, 4, 29-34.
http://dx.doi.org/10.4236/msa.2013.412A005

[9]   Paglia, C., Wombacher, F., Bhni, H. and Sommer, M. (2002) An Evaluation of the Sulfate Resistance of Cementitious Material Accelerated with Alkali-Free and Alkaline Admixtures: Laboratory vs. Field. Cement and Concrete Research, 32, 665-671.
http://dx.doi.org/10.1016/S0008-8846(01)00739-6

[10]   Taylor, H. (1997) Cement Chemistry. Thomas Telford, London.

[11]   Menendez, E., Matschei, T. and Glasser, F. (2013) Sulfate Attack of Concrete. In: Alexander, M., et al., Eds., Performance of Cement-Based Materials in Aggressive Aqueous Environments, RILEM State-of-the-Art Reports 10, 7-74.
http://dx.doi.org/10.1007/978-94-007-5413-3_2

[12]   Hills, L. and Johansen, V. (2007) Hexavalent Chromium in Cement Manufacturing: Literature Review. SN2983, Portland Cement Association, Skokie.

[13]   Ramachandran, V.S. (1995) Admixture Formulations. In: Ramachandran, V.S., Ed., Concrete Admixtures Handbook, Noyes Publications, Park Ridge, 1153.

[14]   Rawal, A., Smith, B., Athens, G., et al. (2010) Molecular Silicate and Aluminate Species in Anhydrous and Hydrated Cements. Journal of the American Chemical Society, 132, 7321-7337.

 
 
Top