| 引用本文: | 李海艳,王英,郑文忠.高温后活性粉末混凝土横向变形性能[J].哈尔滨工业大学学报,2013,45(4):1.DOI:10.11918/j.issn.0367-6234.2013.04.001 |
| LI Haiyan,WANG Ying,ZHENG Wenzhong.Transverse deformation properties of reactive powder concrete after exposure to high temperature[J].Journal of Harbin Institute of Technology,2013,45(4):1.DOI:10.11918/j.issn.0367-6234.2013.04.001 |
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| 摘要: |
| 为获得高温后活性粉末混凝土(RPC)横向变形性能变化规律,对180个70.7 mm×70.7 mm×228 mm的RPC试件进行高温后单轴受压试验,实测了20～900 ℃后纤维种类和掺量不同的RPC横向变形系数随应力比的变化曲线,进而得到高温后RPC体积应变随温度的变化规律．研究表明:常温下RPC泊松比为0.201～0.212,相同温度作用后,泊松比随纤维掺量的增加相应减小;20～400 ℃,RPC泊松比随经历温度的升高逐渐降低,经历温度高于400 ℃时,泊松比有所回升．拟合给出了RPC泊松比随温度变化的计算公式,与试验结果吻合较好． |
| 关键词: 活性粉末混凝土 高温 横向变形系数 体积应变 泊松比 |
| DOI：10.11918/j.issn.0367-6234.2013.04.001 |
| 分类号: |
| 基金项目:教育部长江学者奖励计划资助项目 (2009-37); 教育部博士点基金资助项目 (20092302110046). |
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| Transverse deformation properties of reactive powder concrete after exposure to high temperature |
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LI Haiyan1,2, WANG Ying1, ZHENG Wenzhong1
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(1. School of Civil Engineering, Harbin Institute of Technology, 150090 Harbin, China;2. Mechanics Engineering Department, Shijiazhuang Railway University, 050043 Shijiazhuang, China)
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| Abstract: |
| To obtain the transverse deformation properties of reactive powder concrete (RPC) after high temperature, the uniaxial compression experiments were conducted on 180 prismatic specimens with the size of 70.7 mm×70.7 mm×228 mm for reactive powder concrete (RPC) after exposure to 20～900 ℃. The curves of transverse deformation coefficient with the stress ratio were measured for RPC with various fiber types and contents. Then the relationships between volumetric strain and heating temperature were received. The results indicate that the Poisson's ratio of RPC under room temperature is 0.201～0.212. For the same heat treatment, the Poisson's ratio reduces gradually with the increasing of fiber content. After exposure to 20～400 ℃ the Poisson's ratio decreases gradually with the temperature increases, but it restores when the temperature is higher than 400 ℃. The equation to express the relationship between Poisson's ratio and exposure temperature is proposed, and the fitting curve is in good agreement with the test results. |
| Key words: reactive powder concrete high temperature transverse deformation coefficient volumetric strain Poisson's ratio
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