摘要
陶粒空间分布对轻质混凝土力学性能存在不可忽视的影响,但现有室内实验方法难以对其进行深入研究。本文建立了单轴压缩条件下的陶粒混凝土精细化数值模拟方法,使其能够表征陶粒和天然骨料的几何形状与空间分布。在此基础上,研究了不同规格陶粒空间分布对轻质混凝土单轴压缩条件下宏观和细观力学特征的影响规律。结果表明:提出的数值模拟方法可靠性达92%以上;应力集中一般倾向于在陶粒附近过渡区发展,而对于天然骨料则更易贯穿性发展;大粒径陶粒中心分布能延迟细观应力集中发展,同时抑制应力集中从内向外延伸,从而提升混凝土抗压强度;大粒径陶粒非中心分布不能充分发挥陶粒性能,会导致试件产生明显不均匀压缩变形。
The spatial distribution of ceramsite significantly influences the mechanical properties of lightweight concrete,however,existing laboratory testing methods face challenges to conduct in-depth investigation.This study establishes a refined numerical simulation method for ceramsite concrete under uniaxial compression,capable of characterizing the geometric shape and spatial distribution of both ceramsite and natural aggregates.Based on this method,the effects of spatial distribution and sizes of ceramics on the macroscopic and microscopic mechanical characteristics of lightweight concrete under uniaxial compression were systematically investigated.The results indicate that the proposed numerical simulation method achieves a reliability exceeding 92%.Stress concentration tends to develop in the interfacial transition zone near the ceramsite,whereas it propagates more readily through natural aggregates.Central distribution of large-size ceramics delays the development of meso-stress concentration,inhibits the propagation of stress concentration from the interior to the exterior,and enhances the compressive strength of the concrete.Conversely,non-central distribution of large-size ceramics fails to fully utilize the advantages of the ceramics,resulting in significant non-uniform compression deformation of the specimens.
作者
杨澍
庄胜寒
李敏
苗益祯
任皎龙
YANG Shu;ZHUANG Shenghan;LI Min;MIAO Yizhen;REN Jiaolong(School of Civil Engineering and Ceomatics,Shandong University of Technology,Zibo 255049,China;School of Civil Engineering,Southwest Jiaotong Univeristy,Chengdu 610031,China)
出处
《山东理工大学学报(自然科学版)》
2025年第6期1-8,共8页
Journal of Shandong University of Technology:Natural Science Edition
基金
国家自然科学基金项目(51808326)。
关键词
轻质混凝土
陶粒
空间分布
细观
单轴压缩
lightweight concrete
ceramsite
spatial distribution
mesoscopic
uniaxial compression
