Long-term Performance of Moderate Heat Portland Cement with Double-expansive Sources

武汉理工大学学报-材料科学版(英文版), 2007, 22(1): 35-39.

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1.College of Architecture and Civil Engineering,Zhejiang University of Technology,Hangzhou 310014,China

2.Department of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China

3.College of Architecture and Civil Engineering,Zhejiang University of Technology,Hangzhou 310014,China

4.Department of Materials and Structure,Yangtze River Scientific Research Institute,Wuhan 443134,China

5.Department of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China

基金项目: 国家自然科学基金(59493604) China Yangtze River Three Gorges General 浙江省自然科学基金(597082)

Long-term Performance of Moderate Heat Portland Cement with Double-expansive Sources

Keywords： brucite

The long-term performance of moderate heat Portland cement with double-expansive sources (DE cement) in the system of high MgO clinker and gypsum was studied by XRD, SEM/EDAX and test methods for strength and expansion of cement. Results indicate that the periclase particle, whose size was 5-7.5 μm in DE cement clinker containing 4.8 % MgO, existed individually. The periclase hydration in hardened DE cement paste started at about 60 days and completed up to 2 000 days, and ettringite in the paste was stable from 3 days to 2 000 days. Under the conditions of 4.5%-5.0 % MgO in clinker and 2.8%-3.4 %SO3 in cement,ettringite expansion and brucite expansion in DE cement paste had a continuity, entirety and stability. At the ages of 90, 365, 730 and 2 000 days the expansion of the paste reached 0.07%-0.11%, 0.16%-0.21%, 0.21%-0.27% and 0.29%-0.38 %, respectively. The results suggest that by using this cement in mass concrete it may compensate its temperature shrinkage and autogenous shrinkage to some extent.

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Long-term Performance of Moderate Heat Portland Cement with Double-expansive Sources

参考文献