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High ductility cementitious composites (HDCCs) are a special kind of civil engineering materials that have attracted increasing interest in recent years due to their high tensile strain and robust strain hardening behaviour. Moreover, the excellent crack control ability of HDCCs features the characteristics of multiple cracks rather than a localized crack, and the typical crack width is generally less than 100μ m [1-5]. The unique mechanical properties of HDCCs materials overcome the weaknesses in the inherent brittleness and cracking sensitivity of traditional concrete. Hence, broad application prospects can be expected in civil infrastructures where the structures are resilient, durable, and sustainable [6, 7]. In typical HDCCs, high strength and high modulus polyvinyl alcohol (PVA) fibers have been widely employed because of their reasonable price and strong crack-bridging capacity [8]. Currently, PVA-HDCCs with compressive strengths ranging from 30MPa to 80MPa have been widely developed to meet various engineering requirements [9-11]. To improve the mechanical performances of HDCCs, the study of tailored micromechanical parameters has always been a key research focus. Since the micromechanical bridging theory was introduced by Li et al., it has been a significant tool to guide the material design of HDCCs, which covers the fibers, matrix, and fiber/matrix interface [12, 13]. Currently, many researchers focus on tailoring the HDCCs matrix and fiber/matrix interface bond to obtain high tensile ductility or tensile strength. However, few researchers have focused on the tailoring of fiber parameters (tensile strength, elastic modulus, length, and diameter). The tensile strength and elastic modulus of fibers are inherent properties that hardly change and depend on the material characteristics and production technology. In contrast, the fiber length can be easily customized and controlled [14], and it is advisable to tailor the fiber length to develop the full potential of fiber performance and maximize the fiber bridging effect.

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Figure 6: Curves of the fiber bridging stress versus the crack opening for fiber lengths ranging from 3mm to 24mm and the fiber/matrix interfacial bonding strength ranging from 1.0MPa to 8.0MPa [Please download the PDF to view the image].

Figure 17: Initial cracking properties of HDCCs with different PVA fiber lengths. (a) Initial stress-deflection curves at the initial cracking point. (b) Effect of the fiber length on the initial cracking flexural strength [Please download the PDF to view the image].

3. A. Alyousif, M. Lachemi, G. Yildirim, G. H. Aras and M. Sahmaran, Influence of cyclic frost deterioration on water sorptivity of microcracked cementitious composites, Journal of Materials in Civil Engineering, vol. 28, no. 4, 2016. DOI: (asce)mt.1943-5533.0001408.

16. X.-R. Cai, S.-L. Xu and B.-Q. Fu, A statistical micromechanical model of multiple cracking for ultra high toughness cementitious composites, Engineering Fracture Mechanics, vol. 78, no. 6, pp. 1091-1100, 2011. DOI:

CircuitPython is a derivative of MicroPython designed to simplify experimentation and education on low-cost microcontrollers. It makes it easier than ever to get prototyping by requiring no upfront desktop software downloads. Simply copy and edit files on the CIRCUITPY "flash" drive to iterate.

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