干湿循环与现场暴露混凝土损伤规律的关系研究

发布时间：2018-04-22 19:25

本文选题：混凝土构件 + 现场暴露　；参考：《混凝土》2014年11期

【摘要】：研究了C30、C50和C80在干湿循环和盐湖现场暴露环境下的损伤变化规律之间的关系,分析了试验环境与混凝土强度和腐蚀时间对相对动弹模量的影响,建立混凝土构件的腐蚀时间与相对动弹模量及干湿循环与现场暴露混凝土损伤的换算方程。试验结果表明:混凝土在干湿循环试验比现场暴露强度损伤的更快。混凝土构件Etr强化的时间与混凝土构件强度等级为负相关关系。混凝土强度等级与损伤加速度A1和损伤速度A0分别呈正指数和负指数函数关系,混凝土强度等级与损伤加速度的换算系数KA和损伤速度的换算系数KV呈指数函数关系,可通过换算系数和干湿循环损伤加速度A1和损伤速度A0预测以建实体工程混凝土的相对动弹模量。
[Abstract]:The relationship between the damage changes of C30C _ (50) and C _ (80) under dry and wet cycles and the field exposure environment of salt lakes was studied. The effects of test environment, concrete strength and corrosion time on the relative dynamic modulus were analyzed. The conversion equations of corrosion time and relative dynamic modulus of concrete members and the damage between wet and dry cycles and exposed concrete in situ are established. The test results show that the damage of concrete in dry and wet cycle is faster than that in field. The time of Etr strengthening of concrete members is negatively related to the strength grade of concrete members. The relationship between concrete strength grade and damage acceleration A1 and damage velocity A 0 is positive and negative exponential function respectively. The conversion coefficient Ka of concrete strength grade with damage acceleration and the conversion coefficient KV of damage velocity are exponential functions. The relative dynamic modulus of concrete can be predicted by conversion coefficient, dry and wet cycle damage acceleration A1 and damage velocity A0.
【作者单位】：吉林交通职业技术学院;
【基金】：国家重点基础研究发展计划(“973”计划)项目(2009CB623203) 国家自然科学基金项目(51178221)
【分类号】：TU528

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