基于多元颗粒堆积的陶粒混凝土内缺陷网络有效含量理论分析
Theoretical Analysis of the Effective Fraction of Defective Network in Ceramsite Concrete
王海平 1王思博 1林建军1
作者信息
- 1. 燕山大学城市固废无害化协同处置及利用河北省工程研究中心，秦皇岛 066000
- 折叠
摘要
缺陷含量是决定缺陷组分对材料宏观性能影响程度的重要因素。陶粒混凝土是现代工程应用最广泛的建筑材料之一，由于骨料周围的界面过渡区（Interfacial Transition Zone, ITZ）以及轻质陶粒自身均具有高孔、低强等特性，二者往往被视为该材料内部的重要缺陷组分，它们相互交错共同构成了影响材料性能的复杂缺陷网络。本文以陶粒混凝土为研究对象，将其简化为由正多面体粗骨料、椭球形细骨料、球形人工陶粒、ITZ以及均质硬化浆体组成的多相复合体系，并以此模型为基础，对由ITZ与人工陶粒组成的复杂缺陷网络的有效含量进行了理论分析，推导出了相对应的缺陷网络相对含量的近似解析公式。然后，结合统计学方法对理论预测公式的有效性进行了验证。同时，借助该理论预测模型详细分析了不同因素对复杂缺陷网络相对含量的影响规律。结果表明：一方面，随着人工陶粒替代率以及陶粒周围ITZ厚度的增加，缺陷网络的相对含量呈现出不同程度的增长趋势，尤其是陶粒替代率的影响更为显著。另一方面，随着砂率的增加，缺陷网络的相对含量逐渐降低，这一趋势与普通混凝土有明显不同，这主要与陶粒混凝土自身独特的缺陷网络特征有关。
Abstract
The effective fraction of defects is a key factor determining the affect of defective components on the macroscopic properties of materials. Ceramsite concrete is one of the most widely used building materials in modern engineering. Owing to the high porosity and low strength of the interfacial transition zone (ITZ) around aggregates and lightweight ceramsites, both of them are generally regarded aTheoretical analysis of the effective fraction of defective network in ceramsite concrete involving multi-style particless the defective components in ceramsite concrete. By interlacing with each other, a complex defective network that dominates the material performance can be formed jointly. Taking ceramsite concretes as the research object, the simplified multi-phase composite systems consisting of regular polyhedral coarse aggregates, ellipsoidal fine aggregates, spherical artificial ceramsite, ITZ, and homogeneous hardened paste are modeled in this paper. On the basis of these models, the theoretical prediction on the effective content of complex defective network composed of ITZ and artificial ceramsites is carried out and an approximate analytical formula for the relative fraction of the defective network is derived. After that, a statistical method is further adopted to verify the validity of the theoretical formula. Besides, by using the predicted theoretical formulas, the effects of various factors on the effective fraction of the complex defective network in ceramsite concrete are studied in detail. The results show that: on one hand, with the increase of the substitution ratio of ceramsites and the thickness of weak ITZs around artificial ceramsite particles, the relative fraction of defective networks increases in different degrees. On the other hand, the relative fraction of defective network gradually decreases as the sand ratio increases. The above trend is very different from that for the ordinary concrete, which can be mainly attributed to the unique characteristics of the defective network in ceramsite concrete.关键词
材料学/陶粒混凝土/多元颗粒堆积/复杂缺陷网络/有效含量/理论分析Key words
materials science/ceramsite concrete/multi-style particle packing/complex defective network/effective fraction/theoretical analysis引用本文复制引用
王海平,王思博,林建军.基于多元颗粒堆积的陶粒混凝土内缺陷网络有效含量理论分析[EB/OL].(2026-11-13)[2026-11-14].http://www.paper.edu.cn/releasepaper/content/202611-8.学科分类
材料科学
