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Shrinkage, creep and frost resistance of self-compacting concrete

机译:自密实混凝土的抗收缩,蠕变和抗冻性

摘要

Although already many researches exist about self-compacting concrete (SCC), it is still remarkable to notice that very little fundamental data have been published concerning its durability. This knowledge is, however, of extreme importance for a good and durable construction practice. For that reason, this article outlines laboratory studies concerning durability aspects as shrinkage, creep, salt frost scaling and internal frost resistance of 7 self-compacting concrete mixtures (SCC) and 1 reference, traditionally vibrated, concrete mix (TC1). In concrete science, time-dependent deformation models as the CEB-FIP Model Code 1990 (MC-90) and the Model B3, are well known for their good prediction of shrinkage and creep of normal concrete. In this paper, the possibility of these models to be transposed to the recently new cementitious material as self-compacting concrete is, is investigated. Test results revealed in general higher shrinkage and creep deformations for the SCC mixtures compared with the TC mix. However, while the shrinkage deformations seem to be underestimated by MC-90, the creep and overall behaviour of the SCC mixes seem to be well predicted by the same model. Salt frost scaling tests lead to a higher amount of scaled material due to the imposed freeze-thaw cycles for SCC in comparison with the TC mix, although the ultrasonic measurements indicated that most SCC mixtures suffered less in comparison with the TC mix. On the other hand, ultrasonic measurements executed to determine the internal frost resistance of test specimens not subjected to salt attack showed similar results for all mixtures. A reason for this observation may be found in the test set up.
机译:尽管已经有许多关于自密实混凝土(SCC)的研究,但值得注意的是,有关其耐久性的基本数据很少发表。但是,这种知识对于良好和持久的施工实践至关重要。因此,本文概述了有关7种自密实混凝土混合物(SCC)和1种参考,传统振动混凝土混合物(TC1)的收缩,蠕变,盐冻结垢和内部抗冻性等耐久性方面的实验室研究。在混凝土科学中,随时间变化的变形模型(例如CEB-FIP模型代码1990(MC-90)和B3模型)以其对普通混凝土的收缩和蠕变的良好预测而闻名。在本文中,研究了将这些模型作为自密实混凝土转移到最新的胶凝材料中的可能性。测试结果表明,与TC混合物相比,SCC混合物通常具有更高的收缩率和蠕变变形。然而,尽管收缩变形似乎被MC-90低估了,但SCC混合物的蠕变和整体性能似乎可以由同一模型很好地预测。盐霜结垢测试由于与TC混合物相比强加了SCC的冻融循环,因此导致结垢的材料量更高,尽管超声测量表明,大多数SCC混合物与TC混合物相比受较少的影响。另一方面,为确定未遭受盐侵蚀的试样的内部抗冻性而进行的超声波测量显示,所有混合物的结果均相似。可以在测试设置中找到进行此观察的原因。

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