期刊
CEMENT AND CONCRETE RESEARCH
卷 41, 期 3, 页码 292-300出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2010.11.015
关键词
Cement; Admixture; Rheology; Grout; Herschel-Bulkley
The influence of water to cement ratio, HRWRA content and viscosity modifying admixture content on the rheological characteristics of cement grouts considered as Herschel-Bulkley fluids is studied experimentally. Results show that cement grouts without chemical admixtures and cement grouts containing only a viscosity modifying admixture present a shear-thinning behaviour with an approximately constant value for the exponent n of Herschel-Bulkley model. On the contrary, grouts containing a HRWRA content near the saturation point exhibit quasi Binghamian behaviour. The Herschel-Bulkley model describes properly the rheological behaviour of cement grouts without chemical admixtures. It can be applied correctly to grouts containing HRWRA and/or viscosity modifying admixture in a shear rate range comprised between 4 s(-1) and 100 s(-1) and can be used to predict satisfactorily the Marsh cone flow time of cement grouts of widely varying compositions. (C) 2010 Elsevier Ltd. All rights reserved.
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