Crack Formation in Cement-Based Composites

3rd International Conference on Competitive Materials and Technology Processes

Sprince, A.^1 ; Pakrastinsh, L.^1 ; Vatin, N.^2

Department of Structural Engineering, Riga Technical University, Riga, Latvia^1

Institute of Civil Engineering, Saint-Petersburg State Polytechnical University, St. Petersburg, Russia^2

关键词: Cement based composites;    Compact tension specimen;    Concrete composition;    Construction structure;    Crack mouth opening displacement;    Digital image analysis;    Experimental curves;    High-resolution digital cameras;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/123/1/012050/pdf
DOI  :  10.1088/1757-899X/123/1/012050

来源: IOP

【 摘 要 】

The cracking properties in cement-based composites widely influences mechanical behavior of construction structures. The challenge of present investigation is to evaluate the crack propagation near the crack tip. During experiments the tension strength and crack mouth opening displacement of several types of concrete compositions was determined. For each composition the Compact Tension (CT) specimens were prepared with dimensions 150×150×12 mm. Specimens were subjected to a tensile load. Deformations and crack mouth opening displacement were measured with extensometers. Cracks initiation and propagation were analyzed using a digital image analysis technique. The formation and propagation of the tensile cracks was traced on the surface of the specimens using a high resolution digital camera with 60 mm focal length. Images were captured during testing with a time interval of one second. The obtained experimental curve shows the stages of crack development.