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首页> 外文期刊>HBRC Journal >Effect of nano-SiO 2 (NS) on dolomite concrete towards alkali silica reaction
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Effect of nano-SiO 2 (NS) on dolomite concrete towards alkali silica reaction

机译：纳米SiO 2 （NS）对白云石混凝土碱硅反应的影响

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The aim of this work was to study the effect of nano silica on the physico-mechanical properties of concrete containing dolomite coarse aggregate and its effect on alkali silica reaction. In this work, Portland cement is replaced by 1, 2 and 4wt.% nano silica (NS). It is clear that nano silica up to 2wt.% leads to increase the compressive strength and decrease the total porosity up to 180days of curing in tap water. This is due to that nano silica content acts as pozzolanic material and nucleating sites for the hydration products, which enhances the cement hydration rate. A 4wt.% NS led to reduce the mechanical properties but is still higher than dolomite control because it leads to coating of the cement grains, retarding its hydration rate and therefore, decreases the hydration products formation. The resistivity of dolomite concrete control against 1N NaOH up to 6months of immersion has been carried out. The results show that all concrete mixes have high resistivity towards 1N NaOH up to 6months of immersion. The compressive strength development rate of dolomite concrete control containing 2wt.% of nano silica is higher than that of control. This is due to the continuous activation and accumulation of hydration products. This indicates that the NaOH has marginal compacts on the mechanical properties reduction, and this result confirmed that dolomite aggregate has higher resistivity to alkali silica reaction. XRD and SEM photograph are applied to investigate the formed hydration products.
机译：这项工作的目的是研究纳米二氧化硅对含白云石粗骨料的混凝土的物理力学性能的影响及其对碱二氧化硅反应的影响。在这项工作中，波特兰水泥被1、2和4wt。％的纳米二氧化硅（NS）代替。显然，高达2wt。％的纳米二氧化硅可以提高抗压强度，并降低自来水中长达180天固化的总孔隙率。这是由于纳米二氧化硅的含量可作为火山灰材料和水合产物的成核位点，从而提高了水泥的水合速率。 4％（重量）的NS导致机械性能降低，但仍高于白云石控制，因为它导致水泥颗粒的涂层，阻碍了其水合速率，因此减少了水合产物的形成。已经进行了白云石混凝土抗1N NaOH浸泡长达6个月的电阻率。结果表明，所有混凝土混合料在浸泡6个月后都具有对1N NaOH的高电阻率。含有2％（重量）纳米二氧化硅的白云石混凝土控制体的抗压强度提高率高于控制体。这是由于水合产物的连续活化和积累。这表明，NaOH在降低机械性能上具有微不足道的压实，并且该结果证实白云石聚集体具有对碱二氧化硅反应的更高的电阻率。用XRD和SEM照片研究形成的水合产物。

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