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首页> 外文期刊>Arabian Journal for Science and Engineering. Section A, Sciences >An Investigation on HVS Paste Modified with Nano-SiO_2 Imperiled to Elevated Temperatures
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An Investigation on HVS Paste Modified with Nano-SiO_2 Imperiled to Elevated Temperatures

机译：高温下纳米SiO_2改性HVS糊料的研究

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摘要

Portland cement (PC) blended with ground granulated blast-furnace slag (denoted as slag) is frequently used to produce more sustainable matrix as well as economical and technical benefits. In this research work, the opportunity of employing nano-SiO2 (NS) to improve compressive strength of high-volume slag (HVS) paste prior and after exposure to thermal loads has been investigated. PC has been partially replaced with slag at level of 65%, by weight, to produce HVS paste. Then, slag was partially replaced with NS at levels fluctuated from 0.5 to 5%, by weight. After initial curing, specimens were exposed to different thermal loads fluctuated from 200 to 800 degrees C with a heating rate of 6.67 degrees C/min for 2 h. Compressive strength prior and after heating was tested. The different decomposition phases formed before and after heating were detected with the help of X-ray diffraction and thermogravimetric techniques. The microstructure of the formed hydration products was determined with the help of scanning electron microscopy (SEM). The results illustrated that the compressive strength prior and after firing increased as NS content increased up to 4%, while 5% NS illustrated contradictory results.
机译：波特兰水泥（PC）与磨碎的高炉矿渣（表示为矿渣）掺合在一起，经常用于生产更具可持续性的基质以及经济和技术效益。在这项研究工作中，已经研究了使用纳米SiO2（NS）来提高大体积矿渣（HVS）糊料在暴露于热负荷之前和之后的抗压强度的机会。按重量计含量为65％的矿渣已部分替代了PC，以生产HVS浆料。然后，将炉渣部分替换为NS，其含量在0.5至5％的重量范围内波动。初始固化后，将样品暴露于200至800摄氏度波动的不同热负荷下，加热速率为6.67摄氏度/分钟，持续2小时。测试了加热前后的抗压强度。借助X射线衍射和热重技术检测加热前后形成的不同分解相。借助于扫描电子显微镜（SEM）确定形成的水合产物的微观结构。结果表明，焙烧前后的抗压强度随NS含量增加至4％而增加，而5％NS则表明结果相反。

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