【作者】 李家和； 王川； 周智； 欧进萍；

【Author】 LI Jia-he, WANG Chuan, ZHOU Zhi, OU Jin-ping( School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150008, China; School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China)

【机构】 哈尔滨工业大学材料科学与工程学院； 哈尔滨工业大学土木工程学院；

【摘要】 随着高强混凝土和高性能混凝土在实际工程中应用得越来越广泛,混凝土早期的收缩及早期开裂问题越来越引起人们的重视.本文根据光纤Bragg光栅的传感特性,针对混凝土材料的自身特点,系统地用裸光栅对非约束状态下及约束状态下的混凝土早期固化过程进行了内部温度及应变监测,探讨了光纤Bragg光栅传感元件在混凝土中的布设工艺和布设要求;最后,对不同状态下的被测对象的早期变形进行了对比研究.研究结果表明:光纤Bragg光栅不仅可以进行混凝土内部温度及变形的测定,在非约束状态下,可以测出混凝土早期的自收缩;在约束状态下,通过测出的混凝土早期应变变化规律可以预测混凝土的开裂状态,而且可以对混凝土早期固化过程进行监测.更多还原

【Abstract】 With more and more widely used of the high strength concrete and high performance concrete in the modern structures, the shrinkage deformation and cracks of the concrete have provoked people paying much attention. According to the sensing properties of the Fiber Bragg Gratings sensors and the self-characters of the concrete, we have finished monitoring the early-time inner-strain changes of the concrete with and without restrictions systematically. We discussed the embedding technology and the embedding requirements of the Fiber Bragg Gratings sensors. Also some comparison research works on the early-time deformation of the concrete specimens in different conditions have been finished. The result shows that Fiber Bragg Gratings can monitor the temperature and strain change inside the concrete during the early-time. Without restrictions self-shrinkage of concrete in early-time can be measured; while with restrictions we can preview the concrete cracks through the early strain changes of the concrete, and we also can monitor the concrete hardening process in the early-time entirely.更多还原