Ultra fractal crack
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Thus, the structure can limit the expansion of cracks and maintain the load carrying capacity under large deformation, , ]. A typical feature of ECC is that they can bear rather large deformation under flexural and tensile load with obvious multiple cracking and strain-hardening behavior. Consequently, it is regarded as an improved concrete material with great potential in structural and engineering applications. Compared to ordinary concrete, which has low tensile strength, low ductility, and is susceptible to cracking, ECC have excellent ductility, toughness, and crack-control ability, , ]. Besides, a quantitative relationship is established between the fractal dimension of surface cracks and the flexural toughness evaluation parameters obtained by the improved JG/T 472–2015 method, which indicates that the fractal dimension of surface cracks can be used to characterize the flexural properties of ECC.įiber reinforced cement-based composites are mainly composed of cement, ultrafine reactive powder, fine aggregate, and fiber, and such composites with ultra-high toughness are often referred to as engineered cementitious composites (ECC). Furthermore, it is verified that the surface cracks of specimens under flexural load exhibit fractal characteristics, and the “fractal dimension” can be used to describe the distribution of surface cracks. Therefore, based on JG/T 472–2015, a simple method which is not limited by deformation and can ignore the influence of load fluctuation, is proposed to evaluate the load carrying capacity and flexural toughness of engineered cementitious composites (ECC) in the strain-hardening stage. JSCE-SF4 and ASTM C1609 methods are the main methods for calculating the flexural toughness, but their single calculation process limits the application range.
#Ultra fractal crack crack
The results indicate that the addition of 2 % polypropylene fiber and 60 % fly ash into matrix facilitates an improvement in strength, and such a cement matrix shows better crack resistance and flexural toughness than ordinary concrete. The compressive strength, flexural strength, deflection, flexural toughness, and equivalent flexural toughness ratio are also measured. In this study, the compressive and flexural properties of polypropylene fiber reinforced cement-based composites are investigated, and a suitable method for evaluating the flexural toughness is proposed.