| 摘要: |
| 对5种强度等级(不同水泥用量和水灰比)、2种养护方式、2种湿度环境共69个混凝土棱柱体试件进行了长达589d的收缩试验，收集了国内外588个混凝土收缩试验数据，通过归一拟合，获得了各因素对混凝土收缩的影响系数公式.基于各因素对混凝土收缩的影响系数公式和试验数据，提出了适用于相对湿度为10%～100%，温度为5～80℃，试件理论厚度为10～500mm，湿养时间为1～500d，水泥用量为190～500kg/m3，水灰比(质量比)为035～070的多系数混凝土收缩模型，该模型计算值与收缩试验数据吻合较好. |
| 关键词: 混凝土棱柱体 收缩试验 收缩模型 影响系数 |
| DOI：103969/j.issn1007 9629201605007 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51378146); 教育部博士点基金资助项目(20132302110064) |
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| A New Multi coefficients Shrinkage Model for Concrete |
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TANG Can, ZHENG Wenzhong
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Key Lab of Structures Dynamic Behavior and Control, Ministry of Education,Harbin Institute of Technology, Harbin 150090, China
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| Abstract: |
| The contracting experiments were conducted on 69 concrete prisms, which include 5 different strength grades, 2 curing conditions, and 2 humidity environments, and experimental data of concrete shrinkage for 589d were accumulated. The influence coefficients of some factors on the shrinkage of concrete were obtained by normalization and fitting 588 experimental data collected from references. A new multi coefficients shrinkage model for concrete was proposed based on the formula of influence coefficients and experimental data, which was suitable for the humidity from 10% to 100%, temperature from 5℃ to 80℃, theoretical thickness from 10mm to 500mm, curing time from 1d to 500d, cement content from 190kg/m3 to 500kg/m3, and water cement ratio(by mass) from 035 to 070. The calculation results from proposed shrinkage model is agreed well with the experimental data. |
| Key words: concrete prism shrinkage test shrinkage model influence coefficient |
