Abstract Limestone calcined clay cement (LC3) is a green binder with great practical importance for the cement industry. Growing application has increased the need to understand the mechanisms governing its thixotropy for better control of workability. While formation of C-S-H bridges is understood to dominate the thixotropy of ordinary Portland cement, LC3 paste displayed unique thixotropy properties. In this study, focused beam reflectance measurement, zeta potential, 1H nuclear magnetic resonance relaxometry and micro X-ray computed tomography were used to track the colloidal interaction and hydration extent within LC3 paste. Results showed that flocculation due to the negative surface charge and water affinity of calcined clay appears to be the dominating factor. This leads to a reduction of water available to contribute to fluidity of the paste and, in turn, governing the development of thixotropy over time. In addition, the dilution effect due to high clinker substitution diminishes thixotropy growth with time.

中文翻译：

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石灰石煅烧粘土水泥 (LC3) 中支配触变性的机制

摘要 石灰石煅烧粘土水泥（LC3）是一种对水泥工业具有重要实用价值的绿色粘合剂。越来越多的应用增加了了解控制其触变性的机制以更好地控制和易性的需求。虽然 CSH 桥的形成被认为在普通硅酸盐水泥的触变性中占主导地位，但 LC3 浆体显示出独特的触变性。在这项研究中，聚焦光束反射测量、zeta 电位、1H 核磁共振弛豫测量和显微 X 射线计算机断层扫描被用来跟踪 LC3 糊剂内的胶体相互作用和水合程度。结果表明，由于煅烧粘土的负表面电荷和水亲和力引起的絮凝似乎是主要因素。这导致可用于促进糊状物流动性的水减少，进而控制触变性随时间的发展。此外，由于熟料替代率高造成的稀释效应会随着时间的推移降低触变性。