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首页> 外文期刊>Revista IBRACON de Estruturas e Materiais >Experimental study of the mechanical behavior of self-compacting concrete based on fracture mechanics
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Experimental study of the mechanical behavior of self-compacting concrete based on fracture mechanics

机译：基于断裂力学的自密实混凝土力学性能试验研究

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摘要

Considering the physical nonlinearity of concrete and the fundamentals of fracture mechanics for quasi-brittle materials, the objective of this study was to determine the fracture energy and the length of the fracture process zone (FPZ) as well as the modulus of elasticity, the tensile strength and the compressive strength of self-compacting concrete (SCC) to characterize its mechanical behavior. A series of tests, including a three-point bending test of SCC and conventional vibrated concrete (CVC) specimens, with a notch at mid-span, and tensile and compressive tests were performed. The mechanical parameters obtained from the CVC specimens were considered as a comparative reference. The effect of the following variables was evaluated and considered at two levels: compressive strength (30 and 50 MPa), granular composition (fine and coarse particle size) and maximum diameter of the aggregate (12 and 20 mm). The effect of these variables on the mechanical behaviors of the SCC specimens was evaluated based on the test results of specimens of four types of concrete, which were obtained from the combination of the variables. The bending tests were performed according to the RILEM TC 89-FMT recommendations, which are based on the size-effect method.
机译：考虑到混凝土的物理非线性和准脆性材料的断裂力学基础，本研究的目的是确定断裂能和断裂过程区（FPZ）的长度以及弹性模量，拉伸强度自密实混凝土（SCC）的强度和抗压强度来表征其机械性能。进行了一系列测试，包括SCC和常规振动混凝土（CVC）试样的三点弯曲测试，并在中跨上开槽，并进行了拉伸和压缩测试。从CVC样品获得的机械参数被视为比较参考。在以下两个水平上评估和考虑了以下变量的影响：抗压强度（30和50 MPa），颗粒成分（细粒度和粗粒度）和集料的最大直径（12和20 mm）。这些变量对SCC试样力学性能的影响是根据四种混凝土的试样的测试结果进行评估的，这些结果是通过变量的组合获得的。弯曲测试是根据RILEM TC 89-FMT建议进行的，该建议基于尺寸效应方法。

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