Rheological behavior of a novel quick-setting binder under resting and mixing and its relations to hydration and microstructure
Rheological behavior of a novel quick-setting binder under resting and mixing and its relations to hydration and microstructure
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DOI：
10.1016/j.conbuildmat.2022.129313
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发表时间：
2022-11
影响因子：
7.4
通讯作者：
Jiandong Wang;Guanzhao Jiang;Aixiang Wu;Yi-ming Wang;S. Yin;Yong Wang
中科院分区：
文献类型：
--
作者：
Jiandong Wang;Guanzhao Jiang;Aixiang Wu;Yi-ming Wang;S. Yin;Yong Wang
快凝粘结剂在许多工程领域都很受欢迎。众所周知，水化对这些粘结剂的流动性损失起着重要作用。解决这一问题的当务之急是从根本上了解流变学的时间依赖性。本文采用旋转流变仪、等温量热仪、环境扫描电子显微镜、聚焦光束反射率测量等多种方法相结合的方法，研究了一种新型快凝浆体在静置和混合条件下的流变性、水化和微观结构，首次提出了一种预测给定静置或混合时间的流变参数的数学模型--LinExp模型。除了水化作用外，颗粒沉降和初始静态凝胶强度也是TDR的重要驱动因素，特别是在早期阶段。随着粘结剂的水化、互锁结构的形成和浆体中较大混合颗粒的增加，分别在静置和混合状态下导致了显著的TDR。
Quick-setting binders are very popular in many engineering fields. It is well known that hydration plays an important role in the flowability loss of these binders. The top priority to solve this problem is to understand the time-dependence of rheology (TDR) fundamentally. In this paper, the rheology under resting and mixing conditions, hydration and microstructure of a novel quick-setting paste were investigated by a unique combination method of rotational rheological tests, isothermal calorimetry, environment scanning electron microscope, focused beam reflectance measurement, etc. A mathematical model, called LinExp model, is first proposed to predict rheological parameters at a given resting or mixing time. Besides hydration, particle settling and initial static gel strength are found to be important drivers of the TDR, especially in early stage. With the hydration of the binder, the formation of interlocking structures and the increase of large mixed particles in the paste lead to the significant TDR under resting and mixing, respectively.