| 强度等级对矿渣粉混凝土早期弯曲徐变性能的影响 |
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| 引用本文： | 周双喜.强度等级对矿渣粉混凝土早期弯曲徐变性能的影响[J].西安建筑科技大学学报(自然科学版),2009,41(6). |
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| 作者姓名： | 周双喜 |
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| 作者单位： | 华东交通大学土木铁路环境振动与噪声教育部工程研究中心,江西,南昌,330013 |
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| 基金项目： | 铁路环境振动与噪声教育部工程研究中心开放基金资助，江西省教育厅科学技术研究项目 |
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| 摘 要： | 以矿渣粉作为矿物掺合料,配制了两种强度等级的混凝土,研究了高弯曲应力比(弯曲荷载与弯曲强度的比值,0.7)条件下强度等级对混凝土早期(1～3 d)弯曲徐变的影响.并用体视显微镜观察两种矿渣粉混凝土试样弯曲徐变断裂后的裂纹形貌,研究结果表明矿渣粉混凝土弯曲徐变增长速率随着龄期和加载时间的增加而减小,高强矿渣粉混凝土(C60)在早期(1～3 d)的裂纹扩展比普通强度矿渣粉混凝土(C40)更严重.
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| 关 键 词： | 弯曲徐变 强度等级 应力比 断裂 矿渣粉混凝土 |
Effect of strength grade on flexural creep of early-age concrete with slag powder |
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| ZHOU Shuang-xi.Effect of strength grade on flexural creep of early-age concrete with slag powder[J].Journal of Xi'an University of Architecture & Technology,2009,41(6). |
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| Authors: | ZHOU Shuang-xi |
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| Abstract: | Two strength grade concrete with slag powder as mineral admixture were prepared in this paper. The effect of strength grade on flexural creep of early-age concrete with slag powder is studied under high flexural creep stress ratio of 0.7. The crack morphology features of the concrete fractured by flexural creep were observed microscopically. The experimental results indicate that the increasing speed of flexural creep decreases with the increase of curing age and loading time. The crack spread of high strength grade of concrete with slag powder is more serious than that of ordinary strength grade of concrete with slag powder. |
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| Keywords: | flexural creep strength grade stress ratio crack concrete with slay powder |
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