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Microstructure & properties of steel-reinforced concrete incorporating Portland cement and ground granulated blast furnace slag hydrated at 20 °C
Cement and Concrete Research ( IF 11.4 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.cemconres.2020.106193
Saiful Baharin Duraman , Ian G. Richardson

Abstract The results of a backscattered electron imaging study of the microstructure of the steel- and aggregate-cement paste interfaces of reinforced concrete systems hydrated at 20 °C temperature are reported. The mix using neat OPC showed increasing calcium hydroxide (CH), and decreasing porosity and anhydrous cement levels with respect to age. Higher CH and porosity, and lower anhydrous cement levels at the interfaces compared to the bulk cement were also shown. Mixes incorporating ground granulated blast furnace slag (GGBS) at various cement replacement levels showed consistently low CH, and decreasing porosity, anhydrous cement and unreacted slag levels with respect to age. Higher CH and porosity, and lower anhydrous cement and unreacted slag at the interfaces compared to the bulk were also shown. The slope profiles of unreacted slag at the interfaces were steeper suggesting a narrower interfacial transition zone and thus tighter packing for the GGBS incorporated mixes.

中文翻译:

20℃水化硅酸盐水泥和磨碎的高炉矿渣的钢筋混凝土的显微结构和性能

摘要 报告了在 20 °C 温度下水化的钢筋混凝土系统的钢-骨料-水泥浆界面微观结构的背散射电子成像研究结果。使用纯 OPC 的混合物显示出随着年龄的增长氢氧化钙 (CH) 增加,孔隙率和无水水泥水平降低。与散装水泥相比,界面处的 CH 和孔隙率更高,无水水泥含量更低。在各种水泥替代水平下掺入磨碎的粒状高炉矿渣 (GGBS) 的混合料显示出始终较低的 CH,并且随着时间的推移,孔隙率、无水水泥和未反应的矿渣水平降低。与本体相比,界面处的 CH 和孔隙率更高,无水水泥和未反应炉渣也更低。
更新日期:2020-11-01
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