Manual Interfaces in Cementitious Composites

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Manufacturing Science and Engineering I. Edited by:. Zhengyi Jiang and Chunliang Zhang. Online since:.


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March Cited by. Related Articles. Paper Title Pages. Abstract: In order to investigate flexural behavior of simply-supported beam using recycled coarse aggregate concrete, the difference of the component normal section stress distortion performance and failure characteristic between the recycled concrete beam and the normal concrete beam is researched.


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  5. Based on the experimental the following conclusions are draw. There are also 4 phases of elasticity, cracking, yield and ultimate during the stress course of recycled concrete beam component normal section stress; the average strain measured on cross-section obliges to the plane section assumption; the characteristics of stress distortion and destruction of recycled concrete beam are basically the same as those of the normal concrete beam.

    Under same conditions, the cracking moment and the ultimate flexural carrying capability of recycled concrete beam is almost the same as those of normal concrete beam. The deformation of recycled concrete beam is larger than concrete beam. The conclusion of the paper is that it is still feasible to calculate the ultimate bending moment, cracking moment, and the biggest crack width of recycled concrete beam according to the formula in China Concrete Structure Design Code, but the deflection formula needs to be adjusted.

    Authors: Wen Hui Bai. Abstract: This paper mainly studies the deflection under short-term loading of recycled course aggregate reinforced concrete beam is calculated by using of the formula of short-dated rigidity in code for design of concrete structures. By regressing and analyzing the experimental data from literature, supplied short-dated rigidity modified formula of recycled course aggregate beam. The calculation results are in good agreement with the experimental data.

    Extensive amount of experiments at different length scales have verified the appropriateness of these concepts. Such knowledge is included in this book chapter.

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    Micromechanical properties of cementitious composites

    Brandt, A. CRC Press, London Wang, Y. Ranade, R. Lu, C. Pereira, E. The experimental results on composite properties in Fig. The correlation between composite test results and singlefiber test results can be further studied by examining the length of protruding fibers from a fracture surface of the composite by completely separating two halves of a specimen. Figure 13 confirms the expectation that more and longer embedded fibers can be pulled out in the increasingly higher oiled composite. For example, the highly oiled 1. This means that in the highly oiled composites fewer fibers are damaged by the delamination process depicted in Fig.

    However, it should be pointed out that for complete pullout, the protruded fiber lengths should vary between 0 and 6 mm, with an average of 3 mm for random fiber orientation because the fiber length is 12 mm. Hence, even for the 1. By reducing the interface properties Gd, 0, and , the higher oiling content also reduces the bridging stiffness or the slope of the curve of the resulting composites. This implies that for a given load level during composite strainhardening, it may be expected to experience the larger crack opening.

    The Interfacial Transition Zone in Concrete

    This is consistent with the experimentally monitored crack width Fig. The oiling content of 1. A micromechanical model of tensile strain-hardening in cementitious composites provides useful guidance for microstructure tailoring. In this experimental study, the effective guidance for interface property tailoring for high Jb is revealing.

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    The modification of one phase may necessitate the adjustments of the other phases for truly optimal composite performance. Furthermore, it may be expected that the optimal oiling content could be different for composites manufactured with different processing routes. For example, if an extrusion method is applied,15,26 the microstructure of the interphasal zone can be denser than that in composites formed by a normal casting technique. For such composites, the oiling content needed is likely higher to compensate for the increased bond induced by the stronger compaction process.

    Recent research in PVA-reinforced cementitious composites suggests that the presence of fly ash in the matrix can influence the interfacial behavior. Scalzi are gratefully acknowledged. The authors would like to thank US Silica, Co. Cotterell, B. Aveston, J. Li, V. Naaman, A. Banthia, A.

    The Interfacial Transition Zone in Concrete | NIST

    Bentur, and A. Mufti, eds. Maalej, M. Karihaloo; Y.

    Mai; M. Ripley; and R.

    Ritchie, eds. Pergamon, UK, , pp. Fischer, G. Parra-Montesinos, G. Fukuyama, H. Shao, Y. Kanda, T. Wu, C.

    git.pebibits.com/11915.php Redon, C. Marshall, D.