【摘 要】
：
The influences of nano silica (NS) on the hydration and microstructure development of steam cured cement high volume fly ash (40 wt％, CHVFA) system were investigated. The compressive strength of mortars was tested with different NS dosage from 0 to 4％. Re
【机 构】
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State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan
【出 处】
：
武汉理工大学学报（材料科学版）（英文版）
论文部分内容阅读
The influences of nano silica (NS) on the hydration and microstructure development of steam cured cement high volume fly ash (40 wt％, CHVFA) system were investigated. The compressive strength of mortars was tested with different NS dosage from 0 to 4％. Results show that the compressive strength is dramatically improved with the increase of NS content up to 3％, and decreases with further increase of NS content (e g, at 4％). Then X-ray diffraction (XRD), differential scanning calorimetry-thermogravimetry (DSC-TG), scanning electron microscope (SEM), energy disperse spectroscopy (EDS), mercury intrusion porosimeter (MIP) and nuclear magnetic resonance (NMR) were used to analyze the mechanism. The results reveal that the addition of NS accelerates the hydration of cement and fly ash, decreases the porosity and the content of calcium hydroxide (CH) and increases the polymerization degree of C-S-H thus enhancing the compressive strength of mortars. The interfacial transition zone (ITZ) of CHVFA mortars is also significantly improved by the addition of NS, embodying in the decrease of Ca/Si ratio and CH enrichment of ITZ.
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