Abstract The rapid development of additive manufacturing technologies in the construction industry has heightened interest in the accurate estimation of the structural build-up rates of cementitious materials, especially in in-situ conditions. For this purpose the constant shear rate (CSR) test performed by rotational rheometers using the single-batch approach can be applied. The paper at hand presents possibilities in improving the methodology of experiments and data analysis in the CSR test, for particular rheometers, and discusses both the features and limitations of the test. The breaking criterion is proposed for the CSR tests to prevent excessive deformation in a single sample measurement. Evaluation of the elastic properties of cementitious materials by the CSR test is assessed; two approaches for the characterisation of structural build-up rate based on proportionality limit and flow onset points are compared. The findings are illustrated for the examples of cement paste and cementitious mortars tested using two different types of rotational rheometers.

中文翻译：

---

恒定剪切速率试验用于评价胶结材料的结构堆积速率的可能性和挑战

摘要 随着建筑行业增材制造技术的快速发展，人们对准确估计胶结材料的结构堆积率（尤其是在原位条件下）的兴趣日益浓厚。为此，可以应用由旋转流变仪使用单批次方法进行的恒定剪切速率 (CSR) 测试。手头的论文提出了改进 CSR 测试中实验和数据分析方法的可能性，针对特定的流变仪，并讨论了测试的特点和局限性。为 CSR 测试提出了断裂标准，以防止在单个样品测量中过度变形。通过CSR测试评估胶结材料的弹性性能；比较了基于比例限制和流量起始点来表征结构建立速率的两种方法。以使用两种不同类型的旋转流变仪测试的水泥浆和水泥砂浆为例说明了结果。