Concrete early age basic creep: Experiments and test of rheological modelling approaches
Concrete early age basic creep: Experiments and test of rheological modelling approaches
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DOI：
10.1016/j.conbuildmat.2012.04.101
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发表时间：
2012-11-01
影响因子：
7.4
通讯作者：
Nahas, Georges
中科院分区：
文献类型：
--
作者：
Briffaut, Matthieu;Benboudjema, Farid;Nahas, Georges
大体积混凝土结构的早期开裂很大程度上取决于徐变，尤其是基本蠕变和热拉伸蠕变。直接拉伸试验很难进行，并且实际上对于涉及的现象和拉伸蠕变柔量（相对于压缩蠕变）还没有达成共识。该贡献比较了代表法国核电站的混凝土混合物的蠕变合规性。获得的蠕变柔量在拉伸和压缩方面相似。由于温度演化对于大块结构可能很重要，因此还研究了温度效应。在升高的温度（60 摄氏度）和温度变化（从 20 摄氏度到 60 摄氏度）下，蠕变应变都会显着增加。最后，本文强调了流变模型重现复杂载荷历史（热载荷和机械载荷）引起的蠕变应变的能力。 (C) 2012 Elsevier Ltd. 保留所有权利。
Early age cracking of massive concrete structures highly depends on creep and especially basic and thermal tensile creep. Direct tensile test are difficult to perform and actually no consensus on phenomenon involve and on tensile creep compliance (with respect to compressive one) is available. This contribution compares creep compliance of a concrete mix which is representative of a French nuclear power plant. The obtained creep compliances are similar in tension and in compression. Since temperature evolution could be important in massive structures, temperature effects are also studied. A significant increase of creep strains is shown for an elevated temperature (60 degrees C) but also for a temperature variation (from 20 degrees C to 60 degrees C). Finally, this paper highlights the ability of rheological models to reproduce creep strains due to complex loading history (thermal and mechanical ones). (C) 2012 Elsevier Ltd. All rights reserved.