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《Journal of the Chinese Ceramic Society》 2006-01
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NIU Quanlin1, ZHANG Yong2 (1. College of Materials Science and Engineering, Shandong University of Technology, Zibo 255049, Shandong; 2.China Academy of Railway Science, Beijing 100081, China)  
The corrosion resistance coefficient (flexural strength ratio) of cement mortars incorporating different mineral admixtures was tested according to GB2420, and the ASTM C1012 method was employed to measure the expansion ratio of mortar bars after 15 weeks of immersion in 5% Na_2SO_4 solution. It is shown that all the mineral admixtures are effective in increasing the corrosion resistance coefficient of the samples cured in 3% Na_2SO_4 solution for 2 months, while the expansion of the samples is considerably decreased, as 3CaO·Al_2O_3 content in cement and Ca(OH)_2 content in hydrated products are reduced through dilution and secondary reaction. The large amount of reactive Al_2O_3 in metakaolinis is also beneficial to decrease the gypsum saturation factor (molar ratio of SO_3 and αAl_2O_3); therefore the expansion due to ettringite and gypsum formation are inhibited.
【Fund】: 山东理工大学科研基金(2004KJZ09)资助项目。
【CateGory Index】: TU578.1
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