不规则颗粒–集料的比表面积分析

Analysis and Calculation Method of Specific Surface Area on Irregular Particles-Mineral Aggregate

不规则颗粒比表面积是分析材料的物理性质、研究混合材料性能和组成材料的交互作用能力的重要指标。本文以土木建筑材料中的集料为例,采用理论分析与试验研究相结合的方法,分析提出了使用形状系数S来描述比表面积分析过程的几何模型;分析了密度、几何形状因素,以及耦合因素影响下的不规则颗粒比表面积计算结果的响应规律;对修正方法与AI方法的比表面积进行了比较;形状不同的集料,其比表面积系数相差最高可达到2.5倍;提出了基于密度和几何形状多因素的比表面积分析和计算方法。

Specific surface area of irregular particle is an important indicator for studying physical properties, performance of composite materials and interaction. This research took aggregate in civil construction materials as an example, and used a method combining theoretical analysis with test study to propose a geometric model, which can use coefficient S to characterize specific surface area. The effects of density, geometric shape factor and their combined action on calculation results of specific surface area were studied. The calculation results of specific surface area obtained through modified method is larger by 30% than AI method. The maximum specific surface area coefficient difference among different aggregates can reach 2.5 times. The effect of surface texture structure on calculation of specific surface area was analyzed, and correction factor Kw of texture structure and relative correction method were proposed through characterizing surface structure feature of aggregate. The surface analysis and calculation method of specific surface area based on density, geometric shape and surface structure were proposed.