Effect of n-CaCO3 and metakaolin on hydrated Portland cement
Effect of n-CaCO3 and metakaolin on hydrated Portland cement
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DOI：
10.1680/adcr.11.00010
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发表时间：
2012-08
影响因子：
2
通讯作者：
J. Makar;J. Beaudoin;K. Trischuk;G. Chan;Faroan Torres
中科院分区：
文献类型：
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作者：
J. Makar;J. Beaudoin;K. Trischuk;G. Chan;Faroan Torres
通过与普通波特兰水泥（OPC）、OPC+偏高岭土和OPC + nCaCO 3对比，研究了纳米碳酸钙（nCaCO 3）对OPC掺偏高岭土水泥水化的影响。等温传导量热法测量表明，三元OPC-偏高岭土-nCaCO 3共混物的水合与对照相比具有显著的早期第二相水合活性。X-射线衍射和热重分析确定的相为钙铝硫酸盐，钙钒石和单硫酸盐形成更快的三元共混物比其他样品。nCaCO 3的存在下，也提高了形成C3 A·CaCO 3·12 H2O在两个共混物，包含它。第二相或nCaCO 3本身的存在下，与一个显着降低强度的三元共混物相比，OPC偏高岭土二元共混物。研究结果表明，在混凝土与纳米添加剂的发展需要谨慎。
The effect of calcium carbonate nanoparticles (nCaCO3) on the hydration of ordinary Portland cement (OPC) blended with metakaolin was studied through comparison with OPC, OPC plus metakaolin and OPC plus nCaCO3 control samples. Isothermal conduction calorimetry measurements showed that the hydration of the ternary OPC–metakaolin–nCaCO3 blend had pronounced early secondary phase hydration activity compared to the controls. X-ray diffraction and thermogravimetric analysis identified the phases as calcium aluminosulfates, with both ettringite and monosulfate forming more quickly in the ternary blend than in the other samples. The presence of the nCaCO3 also enhanced the formation of C3A·CaCO3·12H2O in both blends that contained it. The presence of the secondary phases or the nCaCO3 itself was associated with a significant reduction in strength in the ternary blend as compared to the OPC–metakaolin binary blend. The results suggest that caution is needed in the development of concrete with nanoparticle additi...