Slump cones are widely utilised to evaluate the workability of cement materials owing to their simplicity. Analytical models have been established to relate this empirical value to the yield stress. However, they tend to be less effective for the cone and more valid for cylinder slumps. The cause of this deviation is yet to be fully understood. In this work, more details were sought from slump profiles using stereovision technology. A direct comparison of the predicted shapes based on conical model as well as cylindrical model to actual shapes was undertaken. The visual illustration clearly indicated that conical slumping shows a cylinder-like behaviour, and the slumped shapes in cone tests agree well with those predicted by an equivalent cylinder. By converting to cylindrical dimensionless units, the conical slump height can provide an accurate yield stress. The results suggest that the theory is valid if the slumping behaviour is effectively assumed.

坍落度锥因其简单性而被广泛用于评估水泥材料的和易性。已经建立了分析模型以将该经验值与屈服应力相关联。然而，它们往往对锥体不太有效，而对圆柱体坍落度更有效。这种偏差的原因尚未完全了解。在这项工作中，使用立体视觉技术从坍落度曲线中寻找更多细节。对基于圆锥模型和圆柱模型的预测形状与实际形状进行了直接比较。视觉插图清楚地表明圆锥形坍塌显示出类似圆柱体的行为，并且圆锥体测试中的坍塌形状与等效圆柱体预测的形状非常吻合。通过转换为圆柱无量纲单位，锥形坍落度高度可以提供准确的屈服应力。结果表明，如果有效地假设了坍塌行为，则该理论是有效的。