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Effect of Placement Technology on the Bond Strength Between Two Layers of Self-Compacting Concrete

机译：放置技术对两层自压力混凝土粘接力的影响

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Self-compacting concrete (SCC) should generally be placed continuously, but it is not uncommon for contractors to be forced to use interruptions in concrete works due to delivery delays. The multilayer casting of SCC can cause weak bond conditions in the contact area of subsequent layers. Methods of preventing cold joint or lift line formation for normal concretes are not suitable for self-compacting concretes. This article provides research on the effect of multilayer casting technology on the bond strength between two layers of SCC. Three technological variants of connecting successive layers of SCC mixture on beam elements were analyzed: The free flow of the mixture, dropping the mixture from a greater height, and mechanical disturbance of the first layer. Three delay times were applied: 30, 45, and 60 min between two layers of SCC. In general, the research revealed that, regardless of the multilayer casting variant, the bond strength between two layers decreased as the delay time was extended. The best performance and the lowest drop in bond strength were obtained for samples with a mechanically disturbed first layer, independent of the delay time. This method gave similar results to a reference element made without a break in concreting. It was also demonstrated that current recommendations and standard guidelines for multilayer casting appear to be insufficient for ensuring an adequate bond between layers.
机译：自压力混凝土（SCC）通常应持续放置，但承包商不罕见，因为承包商由于交付延迟而被迫使用混凝土作品中的中断。 SCC的多层铸件可导致后续层的接触面积中的粘合条件弱。防止用于正常混凝土的冷关节或提升线形成的方法不适合自压制混凝土。本文提供了多层铸造技术对两层SCC粘合强度影响的研究。分析了在光束元件上连接连续层的SCC混合物的三种技术变体：混合物的自由流动，从更高的高度滴下混合物，并使第一层的机械干扰。施加三次延迟时间：30,45和60分钟在两层SCC之间。通常，该研究表明，无论多层铸造变体如何，随着延迟时间延伸，两层之间的键合强度降低。对于具有机械扰动的第一层的样品，获得了最佳性能和粘合强度的最低降低，与延迟时间无关。该方法将类似的结果与混凝土中没有断裂的参考元件相似。还有人证明，目前的多层铸件的建议和标准指南似乎不足以确保层之间的足够粘合。

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