轻集料颗粒群特征对混凝土力学性能的影响

Effect of Characteristics of Particle Group of Lightweight Aggregate on Mechanical Properties of Lightweight Concrete

摘要:

运用数字图像处理技术研究轻集料的颗粒群特征，采用多种参数表征轻集料颗粒群的粒度和粒形特征.在此基础上，通过灰色关联分析,研究轻集料颗粒群特征对混凝土力学性能的影响.结果表明，当轻集料颗粒群比表面积在520 m2·m-3以上并且颗粒长宽比低于1.34时，所配制的轻集料混凝土能同时达到较高的抗压强度和抗折强度.这为高性能轻集料混凝土的配制提供了依据.

关键词:轻集料; 颗粒群特征; 力学性能; 数字图像处理技术; 灰色关联分析

Abstract:

Digital image processing was used to measure the characteristics of particle group of lightweight aggregate,and multiple parameters were adapted to characterize the characteristic sizes.The effect of characteristics of particle group of lightweight aggregates on mechanical properties of lightweight concrete was then analyzed with grey correlation analysis method.Lightweight concrete of both high compressive strength and high flexural strength could be made with lightweight aggregates of specific surface area higher than 520 m2·m-3 and aspect of particle group lower than 1.34 as well.The results provide a scientific basis for choosing lightweight aggregates when making lightweight concrete.

Key words:lightweight aggregate; characteristics of particle group; mechanical properties; digital image processing; grey correlation analysis method