Development of Cementitious Materials with High Resistance to Sulfate Attack by a Combination of Emulsified Asphalt and Fly Ash

Abstract:

Attack of sulfate crystallization and chemical interaction between sulfate and hydration product is one of the most important factors responsible for degradation of cementitious materials. This study investigates the effects of emulsified asphalt and fly ash as well as their combination on resistance of mortar to physicochemical attack of sulfate in order to develop high performance cementitious materials with high resistance to sulfate attack. The partly-submerged experiment with 5% Na2SO4 solution is designed to simulate physicochemical attack of sulfate salt on sample. Results indicate that, compared with fly ash, addition of emulsified asphalt is more effective in improving the resistance of mortar sample to physical crystallization role and chemical attack of sulfate. Moreover, a combination of fly ash and emulsified asphalt can further enhance the resistance of cementitious materials to physicochemical attack of sulfate, which results from the improvement of microstructure, reduction of CH product and increase of ductility of sample.

• Periodical: Advanced Materials Research (Volumes 450-451)
• Pages: 8-13
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.450-451.8
• Online since: January 2012
• Authors: Guang Cheng Long, Zhe Li, Kun Lin Ma, You Jun Xie
• Keywords: Cementitious Material, Emulsified Asphalt, Fly Ash (FA), Sulfate Attack

References

[1] P.K. Metha. Cement and Concrete Research，Vol. 13, No. 3, 1983, pp.401-406

[2] G Odler. Journal of the American Ceramic Society, Vol. 71, No. 11, 1988, pp.1015-1020

[3] Haynes H, Neill R, Metha P K. Concrete International, Vol. 16, No. 1, 1996, pp.63-68

[4] M Santhanam, M D Cohen, J Oleek. Cement and Concrete Research, Vol. 31, No. 6, 2001, pp.845-851

[5] W Brown. cement & concrete composites, Vol. 24, No. 3, 2002, pp.301-303

[6] Omar S.Baghabra Al-Amoudi. Cement and Concrete Composites, Vol. 24, No. 3, 2002, pp.305-316

DOI: 10.1016/s0958-9465(01)00082-8

[7] SHI Minxia, XIE Youjun, LIU Baoju. Journal of Building Materials, Vol. 6, No. 4, 2003, pp.350-356(in Chinese)

[8] M Santhanam, M D. Cohen. Cement and Concrete Research, Vol. 33, No. 2, 2003, pp.341-346

[9] E.A. Nevill.. Cement and Concrete Research, Vol. 34, No. 8, 2004, pp.1275-1296

[10] Ma Kunlin, Mechanism and Evaluation Method of Salt Crystallization Attack on Concrete[D], Ph-D thesis, Central South University, 2009.6 (in Chinese)

[11] LIU Zanqun. Study of the fundamental of Sulfate Attack on Cementitious Materials[D]. Changsha: Ph-D thesis, Central South University, 2010.5 (in Chinese)