（1 太原理工大学建筑与土木工程学院， 太原 030024； 2 西南交通大学土木工程学院， 成都 610031；3 莆田学院土木工程学院， 莆田 351100）

［摘要］为提出自然环境条件下合理的混凝土收缩预测模型，分析了在温度作用下既有混凝土收缩预测模型的差异性，收集了国内外自然环境条件下24组混凝土试件收缩测试结果，探讨了日照、降雨、环境平均相对湿度、混凝土强度和类型对混凝土收缩应变的影响，基于试验数据，对CEB10模型进行了修正，得到了混凝土收缩预测模型。结果表明，考虑温度效应的既有混凝土收缩预测模型对温度的敏感性有较大差异，不能较为准确预测自然环境条件下混凝土收缩应变；自然环境与实验室标准环境下的混凝土收缩应变之比可分为稳定部分和变化部分，日照、降雨、环境平均相对湿度、混凝土强度和类型影响其稳定部分，温度变化历程影响其变化部分；基于大量实测结果获得的混凝土收缩预测模型公式可较为准确地计算自然环境条件下混凝土收缩应变。

［关键词］自然环境； 混凝土； 收缩预测模型； 相对湿度； 温度

中图分类号：TU311-4文献标识码：A文章编号：1002-848X(2018)22-0095-07

Concrete shrinkage prediction model in natural environment

Wang Yongbao1， Zhao Renda2, Liao Ping3, Jia Yi2

(1 College of Architecture and Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China; 2 School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China; 3 School of Civil Engineering, Putian University, Putian 351100, China)

Abstract:In order to put forward the reasonable concrete shrinkage prediction model under  natural environment, the differences of existing concrete shrinkage prediction models under temperature action were analyzed. The influence of  shrinkage test results of 24 groups of concrete specimens under natural environment at home and abroad were collected. The sunshine, rainfall, environmental average relative humidity, concrete strength and type on the concrete shrinkage were discussed. Based on the experimental data, the CEB10 model was modified to predict the shrinkage of concrete. The results show that the existing shrinkage prediction models considering the temperature effect have great differences in temperature sensitivity and fail to accurately predict the shrinkage strain of concrete under natural environment; the ratio of shrinkage strain of concrete under natural environment and laboratory standard environment can be divided into stable part and changeable part, where sunshine, rain  fall, environmental average relative humidity, concrete strength and type affect the stable part and  temperature change process affect the changeable part; the formula of concrete shrinkage prediction model based on a large number of measured results can more accurately calculate the shrinkage strain of concrete in natural environment.

Keywords:natural environment; concrete; shrinkage prediction model; relative humidity; temperature

*国家自然科学基金项目(51778531)。

作者简介：王永宝，博士，讲师，Email:yonbaowang@163.com。