中国铁道科学2018，Vol.39Issue(1)：23-30,8.DOI:10.3969/j.issn.1001-4632.2018.01.04
早期受扰混凝土受硫酸盐侵蚀后的受荷损伤模型
Loading Damage Model of Early Disturbed Concrete under Sulfate Attack
摘要
Abstract
Based on the principle of damage mechanics,considering the damage of concrete caused by early disturbance from initial solidification to final solidification and sulfate attack,the damage evolution equation and constitutive equation of concrete under compression were derived.The influence of early disturbance on the stress and elastic modulus of corroded concrete was studied and the loading damage model of early disturbed concrete subjected to sulfate erosion was established through the analysis of the compressive strength test and the acoustic emission acquisition results of the corroded concrete which was disturbed at different times in the early stage.Results demonstrate that early disturbance can lead to the decrease in the peak stress and elastic modulus of concrete.The decrease in the peak stress and elastic modulus of concrete disturbed during the intermediate stage from the initial to the final solidification is the most significant,which is reduced by 36.1％ and 34.5％,respectively.The correlation coefficients between the fitting results of the damage evolution equation and the constitutive equation and the test values are all above 0.98.Compared with the undisturbed concrete,the compaction stage of the disturbed corroded concrete is longer under initial loading.For concrete disturbed during the intermediate stage from the initial to the final solidification,it is almost in the initial compaction stage before its relative stress reaches 70％.关键词
混凝土/早期扰动/硫酸盐侵蚀/声发射/损伤/本构方程Key words
Concrete/Early disturbance/Sulfate attack/Acoustic emission/Damage/Constitutive equation分类
建筑与水利引用本文复制引用
潘慧敏,王树伟,赵庆新..早期受扰混凝土受硫酸盐侵蚀后的受荷损伤模型[J].中国铁道科学,2018,39(1):23-30,8.基金项目
国家自然科学基金资助项目(51608469,51578477) （51608469,51578477）
