自我感知型碳纖混凝土於應變量測與損壞偵測之研究

結構物監測是現今土木工程界重要的議題之一，目前工程界及學術界常用之監測方式，主要是將電子感測元件置入試體內部或披覆於試體表面，以進行應變等物理量之量測。然而，感測元件的有效期限通常遠低於結構物之使用壽命，耐久性較差。為使感測元件的使用壽命與所監測之結構物相近，本文嘗試以碳纖混凝土作為結構監測之元件，探討此種材料是否具有感測應變及偵測損壞之能力，並研究此智慧型碳纖維混凝土於結構監測應用之可行性。試驗結果顯示碳纖混凝土在受拉時纖維產生拉拔（pull-out），此時電阻值會提高，拉力消失後纖維產生推進（push-in），電阻值會下降，可以應用碳纖混凝土之電阻變化率與應變的線性關係，量測混凝土之應變。當碳纖維混凝土受力將達到破壞時，電阻值會忽然升高許多，藉此現象可偵測結構體是否產生裂縫與達到破壞。

關鍵字

碳纖混凝土；自我感知；應變量測；損壞偵測

並列摘要

Structural monitoring system is important in civil engineering. There are some advantages in carbon fiber reinforced concrete, such as high tensile strength, high ductility which increase seismic capacity and security of structures. The traditional structural monitoring system has some disadvantage such as the life of sensor is shorter than structures. To find a sensor with long life as structure, in this research we used CFRC (Carbon Fiber Reinforced Concrete) as the structural monitoring sensor. CFRC with the functionality similar to piezoresistivity material can be used as a self-sensing material for strain measurement and damage detection. It is based on the reversible effect of strain on the volume electrical resistivity and the irreversible effect of damage on the resistivity. The strain sensing behavior is such that the resistivity decreases reversibly upon compression due to the slight push-in of crack-bridging fibers and the consequent decrease of the contact electrical resistivity of the fibercement interface. Similarly, the resistivity increases reversibly upon tension due to the slight pull-out of crack-bridging fibers and the consequent decrease of the contact resistivity.

並列關鍵字

CFRC ； self-sensing ； strain measurement ； damage detection

國際替代計量

自我感知型碳纖混凝土於應變量測與損壞偵測之研究

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