【摘 要】
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In this research the pozzolanic activity of commercial nanosilica was evaluated in lime pastes.Nanosilica samples used (suspension-NS and powder-Ny) were ch
【机 构】
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Materials and Minerals Department, Universidad Nacional de Colombia.Colombia
【出 处】
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The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
In this research the pozzolanic activity of commercial nanosilica was evaluated in lime pastes.Nanosilica samples used (suspension-NS and powder-Ny) were characterized by X-ray diffraction (XRD), particle size distribution (PSD), and zeta potential.The lime used was reagent grade.Lime/nanosilica pastes in proportions on dry basis 50-50 wt% and 70-30 wt%, were produced using water/cementitious-materials ratio (w/cm) of 1.0,0 according to the procedure in ASTM-C305.These pastes were stored in sealed containers to be tested at land 3 curing days.Mineralogical evolution over time by X-ray diffraction (XRD) and Thermogravimetry analysis (TGA) was evaluated.It was found that due to its particle size, ease of dispersion, and stability at high pH values;the nanosilica in suspension has an a better capacity and speed of fixation of lime.
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