基于贝塞尔曲线的卵石骨料混凝土细观模型

针对目前卵石骨料混凝土细观模型的研究不足建立了一种基于贝塞尔曲线的卵石骨料模型,并通过图像处理方法获取了真实卵石骨料的长宽比和半径变异度两个重要参数的概率分布特性。在此基础上,进一步开展了混凝土细观模型迂曲度的研究。结果表明:贝塞尔曲线可以有效地模拟具有光滑边缘的卵石骨料;对真实卵石骨料形状的图像处理结果表明,骨料长宽比服从一般极值分布,取值大多在1.0～3.0之间,半径变异度服从对数正态分布,取值大多在0.1～0.8之间;卵石骨料混凝土细观模型的迂曲度小于碎石骨料,且两者的差别随着骨料含量的增加而增大。

Concrete Mesoscopic Model of Pebble Aggregates Based on Bezier Curve

In view of the lack of current research on concrete mesoscopic model of pebble aggregate, a pebble aggregate model was established based on Bezier curve. The probability distribution characteristics of two important parameters, such as the aspect ratio and radius variability of the real pebble aggregate, were obtained by image processing method. On this basis, the further research on the tortuosity of the concrete mesoscopic model was conducted. The results show that: the Bezier curve can effectively simulate pebble aggregates with smooth edges. the aspect ratio follows the general extreme value distribution, and the values are mostly between 1.0 and 3.0; the radius variability follows the lognormal distribution, and the values are mostly between 0.1 and 0.8; the tortuosity of the concrete mesoscopic model based on pebble aggregates is less than that based on gravel aggregates, and the difference between them increases with the increase of aggregate content.