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The rheological properties of mixed cement paste were studied by rotating viscometer and dynamic shear rheometer

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Abstract: In order to process concrete successfully, it is necessary to predict and control its flow behavior. However, the current standard test does not fully measure or specify the workability of concrete. In addition, only a clear understanding of cement hydration and setting can comprehensively predict and control concrete performance. In order to study the rheological properties of mixed cement paste, the flow characteristics of ordinary cement paste and mixed cement paste were measured by rotary viscometer (RV) to ensure that they can be pumped and treated. In addition, dynamic shear rheometer (DSR) was used to characterize the viscous and elastic components of the paste. Ordinary portland cement paste and mixed paste (slag, fly ash and silica fume) were studiednvestigated in this study. The stress and strain of the blended specimens were measured by the DSR, which characterizes both viscous and elastic behaviors by measuring the complex shear modulus (the ratio of total shear stress to total shear strain) and phase angle (an indicator of the relative amounts of recoverable and nonrecoverable deformation) of materials. Cement pastes generally exhibit different rheological behaviors with respect to age, mineral admixture type, and cement replacement level.

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