Analysis of C3A hydration using soft X-rays transmission microscopy: Effect of EVA copolymer
Analysis of C3A hydration using soft X-rays transmission microscopy: Effect of EVA copolymer
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DOI：
10.1016/j.cemconres.2005.02.002
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发表时间：
2005-10
影响因子：
11.4
通讯作者：
D. Silva;P. Monteiro
中科院分区：
文献类型：
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作者：
D. Silva;P. Monteiro
用软X射线显微镜分析了纯C3A(Ca3Al2O6)在氢氧化钙-石膏饱和溶液中的水化过程。图像显示，在前4小时的水化过程中，至少存在两种不同类型的钙矾石晶体。它们在形态和生长速度上有所不同。当存在乙烯-乙酸乙烯酯共聚物(EVA)时，水化动力学和水化产物的形态发生了显著的变化。EVA颗粒在水化早期抑制甚至阻止钙矾石晶体的形成。观察到一团明亮的小颗粒聚集在水化的C3A颗粒周围。这些颗粒最有可能是EVA和溶液中的无机物种反应的产物。
The hydration of pure C3A (Ca3Al2O6) in calcium hydroxide–gypsum saturated solution was analyzed using soft X-ray microscopy. The images show the presence of at least two different types of ettringite crystals during the first 4 h of hydration. They differ in morphology and growing rate. When poly(ethylene-co-vinyl acetate) (EVA) is present, there is a significant change in the hydration kinetics and morphology of the hydration products. EVA particles inhibited or even prevented the formation of ettringite crystals during the early stage of hydration. A cloud of small, bright particles are observed concentrated around the hydrating C3A grains. The particles are most likely to be a product of reaction between EVA and inorganic species in solution.