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首页> 外文期刊>Spectrochimica Acta, Part B. Atomic Spectroscopy >Investigation of grain sizes in cement-based materials and their influence on laser-induced plasmas by shadowgraphy and plasma imaging
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Investigation of grain sizes in cement-based materials and their influence on laser-induced plasmas by shadowgraphy and plasma imaging

机译：基于水泥基材料的晶粒尺寸及其对激光诱导的等离子体的影响对阴影和等离子体成像

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摘要

The effect of particle grain sizes in different cement-based mixtures on the laser-induced plasma evolution is studied using two experimental methods: (i) temporal and spatial evolution of the laser-induced shock wave is investigated using shadowgraphy and two-dimensional plasma imaging, and (ii) temporal and spatial distribution of elements in the plasma is investigated using two-dimensional spectral imaging. This study is motivated by the interest in applying laser-induced breakdown spectroscopy (LIBS) for chemical analysis of concrete, and subsequently obtain information related to damage assessment of structures like bridges and parking decks. The distribution of grain sizes is of major interest in civil engineering as for making concrete different aggregate grain sizes defined by a sieving curve (64 mm to 0.125 mm) are needed. Aggregates up to a size of 180 mu m can be excluded from the data set, therefore only the amount of small aggregates with a grain size below 180 mu m must be considered with LIBS. All components of the concrete with a grain size smaller than 0.125 mm are related to the flour grain content. Tested samples consisted of dry and hardened cement paste (water-cement ratio w/z = 0.5), which served as a reference. Aggregate mixtures were made by adding flour grains (size 40 mu m) and silica fume (size 0.1 mu m) in different ratios to cement: 10%, 30%, 50% and 60%, all combined to the remaining percentage of dry or hydrated cement. The visualization results show that a dependance in the evolution of the plasma as a function of sample grain size can be detected only in the initial stages of the plasma formation, that is, at the initial 3 mu s of the plasma life. Spectral information reveals the elemental distribution of the silicon and calcium in plasma, in both neutral and ionized form. Here also, a significant effect is observed in the first 1 is of the plasma lifetime.
机译：使用两种实验方法研究了不同水泥基混合物中颗粒粒径对激光诱导的等离子体蒸煮的影响：（i）使用影像和二维等离子体成像研究激光诱导的冲击波的时间和空间演化（ii）使用二维光谱成像研究等离子体中元素的时间和空间分布。本研究通过对混凝土化学分析应用激光诱导的击穿光谱（LIBS）的兴趣，随后获取与桥梁和停车牌等结构的损伤评估有关的信息。晶粒尺寸的分布是对土木工程的重大兴趣，因为制造由筛分曲线（64mm至0.125mm）定义的混凝土不同的晶粒尺寸。可以从数据集中排除尺寸为180μm的聚合，因此只有Libs也只考虑晶粒尺寸低于180μm的小聚集体。晶粒尺寸小于0.125mm的混凝土的所有组分与面粉籽粒含量有关。测试的样品由干燥和硬化的水泥浆（水水泥比W / Z = 0.5）组成，其作为参考。通过将面粉颗粒（大小40μm）和二氧化硅烟雾（尺寸为0.1μm）以不同比例加入水泥的聚集混合物：10％，30％，50％和60％，全部组合到剩余的干燥或水泥。可视化结果表明，仅在等离子体形成的初始阶段中仅在等离子体形成的初始阶段中检测等离子体的演化中的依赖性。光谱信息揭示了中性和电离形式的血浆中硅和钙的元素分布。这里，在第一1中观察到血浆寿命的显着效果。

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