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论文摘要

青岛地区大气环境下混凝土内部温湿度响应

The internal Temperature and Humidity Response of Concrete under Atmospheric Environment in Qingdao Area

作者:王兰芹(山东建筑大学 土木工程学院);姜琳琳(青岛理工大学工程质量检测鉴定中心);王鹏刚(青岛理工大学);赵铁军(青岛理工大学 土木工程学院);焦茂鹏(青岛理工大学 土木工程学院)

Author:WangLanqin(School of Civil Engineering, Shandong Jianzhu University);JIANG Linlin();WANG Penggang();();焦茂鹏()

收稿日期:2020-05-22          年卷(期)页码:2020,52(6):-

期刊名称:工程科学与技术

Journal Name:Advanced Engineering Sciences

关键字:混凝土;大气环境;温度;相对湿度;响应谱

Key words:concrete; atmospheric environment; temperature; relative humidity; response spectrum

基金项目:其它项目:十三五国家重点研发计划子课题:典型混凝土制品开裂风险与耐久性评估(2017YFB0310004-05);山东省重点研发计划:混凝土制品低能耗制造技术与示范应用(2019GSF110006)

中文摘要

滨海严酷环境下,混凝土内部微环境直接影响到混凝土的碳化、氯盐侵蚀和钢筋锈蚀等耐久性能。混凝土内部微环境温湿度受自然环境温湿度影响而又与自然环境温湿度有所差异。为了研究沿海环境下混凝土内部微环境温湿度响应与自然环境温湿度变化之间的关系,对沿海城市-青岛遮挡与暴露两种大气环境温湿度作用和混凝土内部不同深度处的温湿度响应进行了为期一年的现场监测。结果表明:大气环境温湿度均以24小时为周期表现出明显的简谐性周期性波动,温度峰值与相对湿度峰值出现的时间相反。暴露环境的日温湿度变化幅值均大于遮挡环境,夏季暴露与遮挡两环境最大温差达9℃,最大相对湿度差达20%。混凝土内部不同深度处温度响应规律一致,数值差距很小;混凝土内部相对湿度随着深度的增加逐渐增加,短时间内,混凝土内部的相对湿度响应值波动变化不大。经过理论分析,建立了大气环境温湿度作用谱和混凝土内部温湿度响应谱,现场实测结果验证了所建模型可以较好地表征环境温湿度作用及混凝土内部的温湿度响应规律,为准确评估和预测混凝土结构耐久性能提供了依据。

英文摘要

In the harsh coastal environment, the micro-environment of concrete directly affects carbonation of concrete, chloride penetration into concrete and corrosion of rebar in concrete. The temperature and humidity of the micro-environment inside concrete are affected by the temperature and humidity of the natural environment, and are different from that of the natural environment. In order to study the relationship between them, the effect of temperature and humidity at sheltered and exposed atmospheric environments in Qingdao area, and the response of temperature and humidity at different depths in concrete were monitored on the spot for one year. Results indicated that the temperature and humidity of the atmosphere showed obvious harmonic periodic fluctuation in the period of 24 hours, and the temperature peak was opposite to the relative humidity peak. The variation amplitude of daily temperature and humidity in exposed environment was greater than that in sheltered environment. In summer, the maximum difference of temperature between the two environments was up to 9 ℃, and the maximum difference of relative humidity was up to 20%. The response of temperature at different depths inside concrete was consistent and the numerical difference was small. In a short period of time, the response value of relative humidity inside the concrete fluctuated slightly, and it increased gradually with the increase of depth. After theoretical analysis, the action spectrum of temperature and humidity at atmospheric environment and the response spectrum of internal temperature and humidity of concrete were established. The field measured results verified that the model can represent the effect of environmental temperature and humidity and the change regulations of temperature and humidity inside concrete well, and it provides a basis for the accurate evaluation and prediction of the durability of concrete structures.

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