The Effect of Fly Ash on TSA of Cementitous Material: Based on Three Years Results

Abstract:

The thaumasite form of sulfate attack of cementitous material (TSA) is a new kind of sulfate attack and it is more harmful than traditional sulfate attack. By means of Fourier transform infrared (FT-IR) and X-ray diffraction (XRD), the effect of dosage and fineness of fly ash on TSA of cementitous material were investigated in this paper. The specimens had been immersed in magnesium sulfate solution of 5% mass concentration at 5±2° C for three years. The results showed that fly ash could not restrain the formation of thaumasite but it delayed the occurrence of TSA in cementitous material when 30% fly ash takes place of cement. Fly ash could enhance the resistance of cementitous material to TSA through secondary hydration reaction to optimizing the pore structure of hardened cement paste and lowering the C/S of C-S-H gel.

• Periodical: Key Engineering Materials (Volume 539)
• Pages: 139-144
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.539.139
• Online since: January 2013
• Authors: Ben Wan Liu, Chang Hui Yang, Xiao Bin Xiang, Lin Wen Yu, Jing Zhang
• Keywords: Cement-Based Material, Fly Ash (FA), TSA

References

[1] M Santhansm,M D Cohen and J Olek:Cem Concr Res.Vol.31 (2001),p.845.

[2] Thaumasite Expert Group, The Thaumasite Form of Sulfate Attack: Risks, Diagnosis, Remedial Works and Guidance on New Construction(Department of the Environment, Transport and the Regions, London, UK,1999)p.42.

[3] S Tsivilis, G Kakali, A Skaropoulou,et al: Cem Concr Compos.Vol.25(2003), p.969.

[4] Mulenga D M,Stark and J Nobst P: Cem Concr Compos.Vol25(2003),p.907.

[5] P Nobst and J Stark: Cem Concr Compos. Vol. 25(2003), p.899.

[6] Ma Baoguo, Luo Zhongtao and Gao Xiaojian: Journal of Railway Science and Engineering. Vol.6(2006),p.40.

[7] Ma Baoguo, Gao Xiaojian and Luo Zhongtao: Journal of Materials Science and Engineering, Vol.2(2006),p.230.

[8] Gao Xiaojian , Ma Baoguo and Deng Hongwei:Journal of Harbin Institute of Technology. Vol.10(2007),p.54.

[9] Maria C and Garci Juenger: Cem Concr Res.Vol.32(2002),p.289.

[10] Rospondek M, Lew and A owska.: Prace Specjalne Minieralogical Society of Poland. Vol20(2002),p.187.

[11] Zhang Fengchen, Ma Baoguo, Wu Shengxing and Zhou Jikai:Journal of Wuhan University of Technology,.Vol. 26(2011),p.561.

[12] M Teresa Blanco and Angel Palomo: Springer Science Business Media. Vol.23(2007),p.233.

[13] Xiao gang Zhao:PhD. (Wuhan University of Technology, Wuhan ,China,2010).

[14] F Bellmann and J Stark: Cem Concr Res.Vol.38(2008),p.1154.