摘要
通过真实混凝土断层拍照成像及自行开发的图像处理技术,精确区分粗骨料与砂浆,进一步统计获取真实不规则骨料的数量与尺寸信息。开发了一种二维不规则颗粒重构技术,以颗粒尺寸为控制指标,通过一组特征值向量控制生成特定形状的不规则颗粒;进一步开发了相应的颗粒随机有序堆积算法,结合获取的实际颗粒数量与尺寸信息,重构一幅不规则颗粒图像。最后,通过数值模拟方法,研究粗骨料颗粒形状对氯离子传输过程的影响。结果表明,利用"中心生长法"重构的不规则颗粒体系能很好的模拟真实体系,稳态氯离子扩散系数偏差仅有1.35%。
By 2D real concrete section binarization technologies developed,the number and size information of real irregular aggregates were obtained.Based on cellular automata theory,it developed a 2D reconstruction method of irregular particles controlled by appropriate eigenvalue vector.The two phase initial concrete structure,irregular particles in mortar,was reconstructed by the corresponding particles randomly accumulation algorithm coupled with the number and size information of real irregular aggregates.The influence of coarse aggregate particle shapes in chloride ion transport process was studied by numerical simulation.The results show that the irregular aggregates system reconstructed by"center growth method"is close to the real system,the difference of steady chloride diffusion coefficient between the reconstructed system and real one is 1.35%,merely.
作者
肖开乾
谢德擎
石亮
夏文辉
XIAO Kaiqian;XIE Deqing;SHI Liang;XIA Wenhui(Wuhan Municipal Construction Group Co.,Ltd.,Wuhan 430056,China;State Key Laboratory of High Performance Civil Engineering Materials,Nanjing 210008,China;Jiangsu Sobute New Materials Co.,Ltd.,Nanjing 211103,China)
出处
《混凝土》
CAS
北大核心
2020年第2期144-149,共6页
Concrete
基金
国家重点研发计划(2017YFB0309904)
国家重点基础研究发展计划(973)资助(2015CB655105)
江苏省自然科学基金资助(BK20161101,BK20160104,BK20171111)
重点工程研发项目资助(DG1-T02-2017,ZXGS-KJ-01)。
关键词
混凝土
不规则骨料
中心生长法
特征值向量
数值模拟
concrete
irregular aggregate
center growth method
eigenvalue vector
numerical simulation
