具有不同界面相厚度的混凝土动态特性

发布时间：2018-04-22 02:35

本文选题：混凝土 + 界面相　；参考：《高压物理学报》2017年03期

【摘要】：在细观层次上,可将混凝土看作由水泥砂浆、粗骨料和界面相组成的三相复合材料。为探讨界面相对混凝土动态力学特性的影响,编写了含界面相的圆形骨料随机分布程序,并对具有不同界面相厚度的混凝土动态破坏过程进行模拟,揭示界面相厚度、粗骨料大小、粗骨料体积分数和试件尺寸对混凝土动态特性的影响规律。研究表明:与普通混凝土相同,含界面相的混凝土表现出明显的尺寸效应;随着界面相厚度的增大,混凝土承载能力逐渐减小;保持界面相厚度和粗骨料尺寸不变时,随着粗骨料体积分数的增加,混凝土承载能力呈先增大后减小趋势;保持粗骨料最小粒径和界面相厚度不变时,随着粗骨料最大粒径的增大,混凝土承载能力呈先增大后减小趋势。
[Abstract]:At the meso-level, concrete can be regarded as a three-phase composite composed of cement mortar, coarse aggregate and interfacial phase. In order to investigate the influence of interface on dynamic mechanical properties of concrete, a random distribution program of circular aggregate with interface phase was compiled, and the dynamic failure process of concrete with different interfacial phase thickness was simulated to reveal the thickness of interface phase. The influence of coarse aggregate size, coarse aggregate volume fraction and specimen size on the dynamic characteristics of concrete. The results show that the concrete with interfacial phase exhibits obvious size effect, the bearing capacity of concrete decreases with the increase of interface phase thickness, and the thickness of interface phase and the size of coarse aggregate are kept constant. With the increase of the volume fraction of coarse aggregate, the bearing capacity of concrete increases first and then decreases, while keeping the minimum particle size of coarse aggregate and the thickness of interface phase unchanged, with the increase of maximum particle size of coarse aggregate, The bearing capacity of concrete increases first and then decreases.
【作者单位】：宁夏大学土木与水利工程学院;
【基金】：国家自然科学基金(51368048,11162015) 教育部“长江学者和创新团队发展计划”创新团队项目(IRT1067)
【分类号】：TU528

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