Rheological Behavior of Hardened Cement Paste under Low Stresses


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Title: Rheological Behavior of Hardened Cement Paste under Low Stresses

Author(s): Joseph Glucklich and Ori Ishai

Publication: Journal Proceedings

Volume: 57

Issue: 2

Appears on pages(s): 947-964

Keywords: none

Date: 2/1/1961

Rheological experiments determined the complete theological model of hardened cement paste. It is shown that for a W/C ratio of 0.32 and air-sealed material the model consists of: (a) a Hookean spring; (b) three Kelvin elements, of different parameters, in series; (c) a nonre-versible Kelvin element; (d) an element comprising a dash-pot, representing deformation due to microcracking. All these elements are connected in series. Elements (a) and (b) represent reversible deformation, while (c) represents a nonreversible deformation and (d) a small deformation reversible up to a few hours after loading and non-reversible thereafter. It is suggested that the deforma-tional response of the material to load is dependent on hygrometric conditions to such a degree as to make the resulting quantitative differences seem like differences of quality. The various rheological parameters were determined.