Abstract In the present work, we aim at improving our understanding of the effect of synthetic flexible fibers on the rheology of fresh cement-based suspensions. We first measure the way that synthetic fibers do increase the yield stress of various fresh cement pastes and mortars. We then measure, using micro CT, the way these fibers are deformed in a fresh paste. Finally, we propose a simple physical model allowing for the prediction of the fibers conformation as a function of their geometry, their elastic properties and the rheology of the cement-based material, into which they are dispersed. We validate this model on our results and discuss its application at the scale of mortars and concretes.

中文翻译：

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柔性纤维对新拌水泥浆体和砂浆屈服应力的影响

摘要 在目前的工作中，我们旨在提高我们对合成柔性纤维对新鲜水泥基悬浮液流变学影响的理解。我们首先测量合成纤维确实增加各种新鲜水泥浆和砂浆的屈服应力的方式。然后，我们使用显微 CT 测量这些纤维在新鲜糊状物中的变形方式。最后，我们提出了一个简单的物理模型，允许根据纤维的几何形状、弹性特性和水泥基材料的流变性来预测纤维构象，它们分散在其中。我们根据我们的结果验证了这个模型，并讨论了它在砂浆和混凝土规模上的应用。