Freezing resistance of high iron phoasphoaluminate cement

17th IUMRS International Conference in Asia

Zhang, S.X.^1,2 ; Lu, L.C.^1,2 ; Wang, S.D.^1,2 ; Zhao, P.Q.^1,2 ; Gong, C.C.^1,2

Shandong Provincial Key Lab. of Preparation, Measurement of Building Materials, University of Jinan, Jinan

250022, China^1

School of Materials Science and Engineering, University of Jinan, Jinan

250022, China^2

关键词: Freeze-thaw cycles;    Hydration products;    Low alkalinities;    Ordinary Portland cement;    Relative dynamics;    Sulphoaluminate cement;    Three dimensional network structure;    Visual examination;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/182/1/012044/pdf
DOI  :  10.1088/1757-899X/182/1/012044

来源: IOP

【 摘 要 】

The influence of freeze-thaw cycle on the mechanical properties of high iron phoasphoaluminate cement was investigated in the present study. The visual examination was conducted to evaluate the surface damage. The deterioration considering the weight loss, modulus loss of relative dynamic elastic and strength loss of mortar were also investigated. The morphology of hydration products were analysed by SEM. Compared with ordinary Portland cement and sulphoaluminate cement, the frost resistance of high iron phosphoraluminate cement is better. Hydration products of high iron phoasphoaluminate cement contain sheet crystals, and a lot of gel form a dense three-dimensional network structure, which results in a lower porosity. Different from ordinary Portland cement, the hydration product of high iron phoasphoaluminate cement does not contain Ca(OH)2, and low alkalinity reduces its osmotic pressure. The lower porosity and osmotic pressure are the two main reasons which causes in the higher frost resistance of high iron phoasphoaluminate cement.