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首页> 外文期刊>Cement and Concrete Research >Automated identification of the aggregate-paste interfacial transition zone in mortars of silica sand with Portland or alkali-activated slag cement paste
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Automated identification of the aggregate-paste interfacial transition zone in mortars of silica sand with Portland or alkali-activated slag cement paste

机译：使用硅酸盐或碱活化矿渣水泥浆自动识别硅砂砂浆中的骨料-浆体界面过渡区

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摘要

The interfacial transition zone (ITZ) between cement paste and aggregate strongly influences the mechanical and transport properties of mortar and concrete. Backscattered electron (BSE) imaging in the scanning electron allows anhydrous cement, hydration products, and porosity in this region to be quantified by compositional contrast. When the aggregate has a similar brightness to the hydrates, as in some alkali-activated cement mortars with silica sand, automated identification of the aggregate edge in the BSE image is difficult. Manual identification is laborious and prone to errors. Here we demonstrate use of energy dispersive X-ray (EDX) dot maps, acquired concurrently with the BSF to enable compositional identification of the aggregate edge automatically. The mortars studied were prepared with OPC or slag activated with either sodium silicate or potassium hydroxide. The edges of the silica sand aggregate particles were located to within 2.5 #mu#m, and the gradation of microstructure across the ITZ was quantified automatically. Hydrates were found most successfully to infill the ITZ in sodium silicate-activated slag cement mortars.
机译：水泥浆和骨料之间的界面过渡区（ITZ）强烈影响砂浆和混凝土的机械和运输性能。扫描电子中的背向散射电子（BSE）成像使该区域中的无水胶结物，水合产物和孔隙度可以通过成分对比来定量。当集料具有与水合物相似的亮度时，例如在某些带有硅砂的碱活化水泥砂浆中，很难自动识别BSE图像中的集料边缘。手动识别很费力并且容易出错。在这里，我们演示了与BSF同时获取的能量色散X射线（EDX）点图的使用，以自动识别聚集边缘。研究的砂浆是用OPC或用硅酸钠或氢氧化钾活化的矿渣制备的。硅砂骨料颗粒的边缘位于2.5微米以内，并且自动定量了整个ITZ的微观结构的等级。发现水合物最成功地将ITZ填充到硅酸钠活化的矿渣水泥砂浆中。

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