Investigation on Rheological Characteristics of Fresh Cement Mortar

Abstract:

The rheological properties of cement-based materials can be used to guide its construction. In this paper, rheological characteristics of fresh cement mortar (FCM) were investigated. The rheological model and its parameters of the FCM under different hydration time, different water to cement ratio (w/c) and sand to cement ratio (s/c) were obtained by the rheological testing and model analyzer. The result indicated that rheological model of the FCM is transformed from Burgers model to Bingham model with the extension of hydration time. And the model transformed from Burgers model to five component model with the decrease of w/c and the increase of s/c. However, the superplasticizer has little effect on the rheological model of cement mortar. The plastic deformation of the fresh cement mortar increased gradually with the prolongation of the hydration time, and the plastic yield value increased gradually from 50Pa to 250Pa with the increase of s/c. The change rate of plasticity of mortar is reduced from 422Pa/h to 107Pa/h with the increase of superplasticizer’s dosage, which shows the addition of superplasticizer retards the hydration rate.

• Periodical: Materials Science Forum (Volume 913)
• Pages: 1083-1089
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.913.1083
• Online since: February 2018
• Authors: Zhi Long Cao, Li Hui Xue, Sha Sha Tian, Jian Ying Yu*, Huang Zhang
• Keywords: Fresh Cement Mortar, Plastic Deformation, Rheological Model, Rheological Properties

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