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工程科学与技术:2020,52(6):131-138
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青岛地区大气环境下混凝土内部温湿度响应
(1.青岛理工大学 土木工程学院,山东 青岛 266033;2.山东建筑大学 土木工程学院,山东 济南 250101;3.青岛理工大学 工程质量检测鉴定中心,山东 青岛 266033)
Internal Temperature and Humidity Response of Concrete Under Atmospheric Environment in Qingdao Area
(1.School of Civil Eng., Qingdao Univ. of Technol., Qingdao 266033, China;2.School of Civil Eng., Shandong Jianzhu Univ., Jinan 250101, China;3.Eng. Quality Inspection and Appraisal Center of Qingdao Univ. of Technol., Qingdao 266033, China)
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投稿时间:2020-05-22    修订日期:2020-07-25
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 h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。
中文关键词: 混凝土  大气环境  温度  相对湿度  响应谱
Abstract: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. The maximum temperature difference 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. Based on theoretical analyses, 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 measurement results verified that the model could represent the effect of environmental temperature and humidity and the change regulations of temperature and humidity inside concrete well, and it provided a basis for the accurate evaluation and prediction of the durability of concrete structures.
文章编号:202000419     中图分类号:TU528.1    文献标志码:
基金项目:国家重点研发计划项目(2017YFB0310000);山东省重点研发计划项目(2019GSF110006)
作者简介:王兰芹(1978-),女,博士生,讲师.研究方向:混凝土耐久性.E-mail:wanglq006@sina.com
引用文本:
王兰芹,姜琳琳,王鹏刚,赵铁军,焦茂鹏.青岛地区大气环境下混凝土内部温湿度响应[J].工程科学与技术,2020,52(6):131-138.
WANG Lanqin,JIANG Linlin,WANG Penggang,ZHAO Tiejun,JIAO Maopeng.Internal Temperature and Humidity Response of Concrete Under Atmospheric Environment in Qingdao Area[J].Advanced Engineering Sciences,2020,52(6):131-138.