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首页> 外文期刊>Cement and Concrete Research >The macro- and micro properties of cement pastes with silica-rich materials cured by wet-mixed steaming injection
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The macro- and micro properties of cement pastes with silica-rich materials cured by wet-mixed steaming injection

机译：湿法混合蒸汽喷射固化的富含二氧化硅材料的水泥浆的宏观和微观性能

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This research used cement pastes with a low water/blame ratio (W/b = 0.27). Rice husk ashes (RHA) burned at 700 and 850 deg C, silica fume, silica sand (Ottawa standard sand), etc., were the added ingredients. Wet-mixed steam injection (WMSI) was at five different temperatures: 65, 80, 120, 150 and 180 deg C. We investigated cement pastes with added silica-rich materials. For different WMSI temperatures and times, we explored the relations between compressive strength, hydration products, and pozzolanic reaction mechanism. From scanning electron microscopy (SEM) and EDS, we know that hydration products become very complicated, depending on the WMSI temperatures and times. It is difficult to determine the direct effects on the strength based on changes in the products. Experimental results, however, clearly showed that the compressive strength was worst for 80 deg C and best for 180 deg C. High-temperature WMSI is best with 4-h presteaming period and 8-h retention time. Curing in saturated limewater for 28 days did not increase the strength. The three types of silica-rich materials used in this research all participated in the reaction during high-temperature WMSI; they helped to increase the strength. Addition of Ottawa standard sand resulted in the best strength, followed by addition of RHA, while addition of silica fume was worse than the others. Specimens treated with high-temperature WMSI would swell slightly if they were placed in air. This was different from normal-temperature curing.
机译：这项研究使用了低水灰比（W / b = 0.27）的水泥浆。添加了在700和850摄氏度下燃烧的稻壳骨灰（RHA），硅粉，硅砂（渥太华标准砂）等。湿混蒸汽注入（WMSI）处于五个不同的温度：65、80、120、150和180℃。我们研究了添加了富含二氧化硅的材料的水泥浆。对于不同的WMSI温度和时间，我们探索了抗压强度，水合产物和火山灰反应机理之间的关系。通过扫描电子显微镜（SEM）和EDS，我们知道水合产物变得非常复杂，具体取决于WMSI温度和时间。很难根据产品的变化确定对强度的直接影响。然而，实验结果清楚地表明，抗压强度在80℃时最差，在180℃时最好。高温WMSI的预蒸时间为4小时，保留时间为8小时最好。在饱和石灰水中固化28天并没有增加强度。本研究中使用的三种类型的富含二氧化硅的材料均参与了高温WMSI过程中的反应。他们帮助增加了力量。渥太华标准砂的添加产生了最佳强度，其次是RHA，而硅粉的添加则比其他更差。如果将其置于空气中，则经过高温WMSI处理的样品会略微膨胀。这与常温固化不同。

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