Li Jianzhi, Yang Haiqun, Wu Handong
Key Laboratory of Structural Health Monitoring and Control, Shijiazhuang Tiedao University, Shijiazhuang 050043, China.
School of Materials Science and Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China.
Micromachines (Basel). 2023 Dec 22;15(1):29. doi: 10.3390/mi15010029.
The carbonation of concrete greatly affects its service life. In this paper, fiber Bragg grating (FBG) sensors were used to investigate the relationship between concrete carbonation and its mechanical properties. A T130 High Sensitivity Strain Cable Sensor with a good linearity was used to monitor the internal strain in concrete, to investigate the variation in the elastic modulus of concrete with carbonation time. A mathematical model of elastic modulus and carbonation time of concrete based on FBG was established. At the same time, the authors explored the relationship between the carbonation depth and compressive strength of concrete and the carbonation time using a phenolphthalein solution test and a compressive strength test, respectively. The experimental results indicate that the carbonation depth, compressive strength, and elastic modulus of concrete increase with carbonation time. In the early stage of carbonation, these three parameters increase rapidly, while they grow slowly in the later stage of carbonation. The varying trend of the elastic modulus of concrete is consistent with the compressive strength, which shows a binomial relationship. Therefore, the elastic modulus, measured using FBG sensors, is used as an indicator of the characterization of the carbonation resistance of concrete. This work provides a new approach for concrete carbonation detection and assessment.
混凝土的碳化对其使用寿命有很大影响。本文采用光纤布拉格光栅（FBG）传感器研究混凝土碳化与其力学性能之间的关系。使用线性度良好的T130高灵敏度应变电缆传感器监测混凝土内部应变，以研究混凝土弹性模量随碳化时间的变化。建立了基于FBG的混凝土弹性模量与碳化时间的数学模型。同时，作者分别采用酚酞溶液试验和抗压强度试验，探究了混凝土碳化深度、抗压强度与碳化时间之间的关系。试验结果表明，混凝土的碳化深度、抗压强度和弹性模量随碳化时间增加。在碳化初期，这三个参数增长迅速，而在碳化后期增长缓慢。混凝土弹性模量的变化趋势与抗压强度一致，呈二项式关系。因此，利用FBG传感器测得的弹性模量作为表征混凝土抗碳化性能的指标。这项工作为混凝土碳化检测与评估提供了一种新方法。
