Highlights<'/> A Raman spectroscopy based optical fibre system for detecting carbonation profile of cementitious materials
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Sensors and Actuators >A Raman spectroscopy based optical fibre system for detecting carbonation profile of cementitious materials
【24h】

A Raman spectroscopy based optical fibre system for detecting carbonation profile of cementitious materials

机译：基于拉曼光谱的光纤系统，用于检测胶结材料的碳化轮廓

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Highlights•A bespoke Raman spectroscopy based optical fibre platform capable of detecting the carbonation of cementitious materials has been established.•The calcium carbonate and its profile have been successfully detected by this optical fibre Raman system.•The study shows a potential for developing a Raman spectroscopy based optical fibre system for monitoring the chemistry and durability of concrete.AbstractSensors demonstrate huge potential in civil engineering for monitoring the health condition and performance of concrete structures. Amongst various chemical deterioration mechanisms causing inadequate durability of concrete structures, carbonation is one of the most severe mechanisms. It occurs from the chemical reactions between intruded CO2and calcium-bearing phases, hence is accompanied by the formation of calcium carbonate (CaCO3) and the decrease of the alkalinity of concrete pore solution, causing corrosion of rebar in concrete. Thus, detecting carbonation process, especially, determining the carbonation profile (i.e. the content of carbonation products formed against the depth into concrete structure), is of great importance to the diagnosis of the health condition of concrete structures and the prediction of service life. Unfortunately, existing sensors for health monitoring systems suffer from various limitations. Optical fibre Raman technology offers a unique opportunity for developing a novel chemical sensor system capable of monitoring the service-condition of concrete in situ. In the current work, a bespoke ‘coaxial’ optical fibre sensing platform based on Raman spectroscopy was successfully established with a 514.5nm laser. All the optics were tailored for efficiently exciting and receiving signals from cementitious materials, and their diameters were restricted within 0.5in. in order to explore the feasibility of developing an embeddable miniature sensor system in the future. This sensing system was then employed to detect the carbonation mechanism of a plain Portland cement (PC) paste. The calcium carbonate polymorphs as well as the carbonation profile in the PC paste was successfully recognised and established with the results being verified favourably by bench-mounted Raman, X-ray Diffraction (XRD) and Thermogravimetry (TG) analyses. Our results demonstrate a good potential for developing a novel Raman spectroscopy based optical fibre sensor system for monitoring the health condition and the performance of concrete structures in future.
机译： 突出显示 • 已建立了基于定制拉曼光谱的能够检测胶结材料碳化的光纤平台。 • 已成功检测到碳酸钙及其轮廓该光纤拉曼系统。 • 这项研究显示了开发基于拉曼光谱的光纤系统以监测化学和耐久力的潜力具体类型。 摘要 传感器在土木工程中具有巨大的潜力，可以监测混凝土结构的健康状况和性能。在导致混凝土结构耐久性不足的各种化学劣化机理中，碳化是最严重的机理之一。它是由于侵入的CO 2 与含钙相之间的化学反应而产生的，因此伴随着碳酸钙的形成（CaCO 3 ），降低混凝土孔隙溶液的碱度，导致钢筋腐蚀。因此，检测碳化过程，特别是确定碳化曲线（即，相对于混凝土结构的深度形成的碳化产物的含量），对于诊断混凝土结构的健康状况和预测使用寿命非常重要。不幸的是，用于健康监测系统的现有传感器遭受各种限制。光纤拉曼技术为开发新颖的化学传感器系统提供了独特的机会，该系统能够现场监测混凝土的使用状况。在当前的工作中，使用514.5nm激光器成功建立了基于拉曼光谱的定制“同轴”光纤传感平台。所有光学器件都经过专门设计，可有效激发和接收来自胶结材料的信号，其直径限制在0.5英寸以内。为了探讨将来开发嵌入式微型传感器系统的可行性。然后，该传感系统用于检测普通硅酸盐水泥（PC）浆料的碳化机理。成功识别并建立了PC浆中碳酸钙的多晶型物和碳酸化曲线，并通过台式拉曼光谱，X射线衍射（XRD）和热重分析（TG）分析对结果进行了验证。我们的结果表明，将来有可能开发出一种新型的基于拉曼光谱的光纤传感器系统，以监测混凝土结构的健康状况和性能。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号