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From mini-cone test to Abrams cone test: measurement of cement-based materials yield stress using slump tests

机译：从微型圆锥测试到艾布拉姆斯锥测试：使用坍落度测试测量水泥基材料的屈服应力

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摘要

Stoppage tests in civil engineering consists in measuring the shape of a fresh material deposit after flow occurred. This measured geometrical value (slump, spread) is linked to the plastic yield value of these yield stress materials. The most famous example is the Abrams cone for concrete. In this work, the flow induced by a smaller cone test for cement pastes and grouts is studied. In a first part, the spread is theoretically linked to the plastic yield value. Experimental results on several cement pastes validate the obtained relation but also shows the necessity to take in account the surface tension effects for low yield stress materials. The modified relation allows the prediction of the plastic yield value from the measured spread. The proposed method is then applied to the Abrams cone and fresh concrete. It is demonstrated that it is only suitable for high slumps (>20 cm).
机译：土木工程中的停工测试包括测量流动发生后新鲜物料沉积物的形状。该测量的几何值（坍落度，扩展度）与这些屈服应力材料的塑性屈服值相关。最著名的例子是混凝土的艾布拉姆斯锥。在这项工作中，研究了由较小的锥形试验引起的水泥浆和水泥浆的流动。在第一部分中，涂抹酱理论上与塑料屈服值相关。在几种水泥浆上的实验结果验证了所获得的关系，但也表明有必要考虑低屈服应力材料的表面张力效应。修改后的关系允许根据测得的涂抹度预测塑料屈服值。然后将提出的方法应用于艾布拉姆斯锥和新鲜混凝土。事实证明，它仅适用于高塌落度（> 20 cm）。

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