Çopuroğlu Oğuzhan
Section Materials and Environment, Faculty of CEG, Delft University of Technology, Stevinweg 1, Delft 2628CN, The Netherlands.
Materials (Basel). 2016 Mar 8;9(3):176. doi: 10.3390/ma9030176.
Plane and crossed polarization are the two standard light modes in polarized light microscopy that are widely used to characterize crystalline and amorphous phases in cement-based materials. However, the use of the crossed polarized light mode has been found to be restrictive for studying birefringent phases quantitatively due to the extinction phenomenon that arises depending on the crystal orientation. This paper introduces circular polarization microscopy as an alternative technique to overcome the extinction problem during the examination of cementitious materials' microstructure with optical microscopy. In order to evaluate the feasibility of this technique, selected optical and micromorphological features of portlandite clusters were investigated in cement paste. Image analysis results showed that compared to the conventional crossed polarization technique, circular polarization offers significant advantages when portlandite quantification is of interest, and it stands out as a promising low-cost alternative to backscattered electron microscopy.
平面偏振光和交叉偏振光是偏振光显微镜中的两种标准光模式，广泛用于表征水泥基材料中的结晶相和非晶相。然而，由于取决于晶体取向而出现的消光现象，已发现交叉偏振光模式在定量研究双折射相时具有局限性。本文介绍了圆偏振显微镜，作为一种替代技术，以克服在用光学显微镜检查水泥基材料微观结构时的消光问题。为了评估该技术的可行性，对水泥浆体中波特兰石簇的选定光学和微观形态特征进行了研究。图像分析结果表明，与传统的交叉偏振技术相比，当需要对波特兰石进行定量分析时，圆偏振具有显著优势，并且它是背散射电子显微镜一种很有前景的低成本替代方法。
