This paper explores the potential of using optical fiber Raman spectroscopy for continuously monitoring the early hydration of cement thanks to its superb capacities for characterizing wet samples and poorly-structured calcium-silicate-hydrate (C-S-H) as well as its excellent remote sensing competence. A bespoke optical fiber excitation Raman spectrometer with a 632.8 nm laser wavelength under an “optical fiber excitation + spectrometer objective collection” configuration was established and applied. The ongoing hydration of a clinker and a Portland cement (PC) was then monitored during their first 8 h of hydration. The main hydration products, in particular, C-S-H and ettringite & monosulfate (AFt & AFm), have been successfully identified and continuously monitored in situ. The findings from the optical fiber Raman were well supported by bench-mounted Raman, X-ray Diffraction (XRD) and Isothermal Conduction Calorimetry (ICC) tests. The results presented in this paper show a great potential of optical fiber Raman spectroscopy for future civil engineering applications.

本文探索了利用光纤拉曼光谱技术连续监测水泥早期水化的潜力，这归因于其对湿样品的表征能力强，结构不良的硅酸钙水合物（CSH）以及出色的遥感能力。建立并应用了“光纤激发+光谱仪物镜采集”配置下的定制激光激发拉曼光谱仪，激光波长为632.8 nm。然后在熟料和硅酸盐水泥（PC）的前8小时水合过程中对其进行的水合作用进行监测。主要水合产品，特别是CSH和钙矾石和一硫酸盐（AFt和AFm）已被成功鉴定并在现场进行连续监测。台式拉曼，X射线衍射（XRD）和等温传导量热法（ICC）测试很好地支持了光纤拉曼的发现。本文介绍的结果表明，光纤拉曼光谱在未来的土木工程应用中具有巨大的潜力。