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Short‐Time Creep Transition for Hardened Cement Paste
Author(s) -
SELLEVOLD ERIK J.,
RICHARDS CEDRIC W.
Publication year - 1972
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1972.tb11285.x
Subject(s) - capillary action , materials science , creep , transition point , viscoelasticity , composite material , redistribution (election) , cement , water content , viscous flow , moisture , thermodynamics , mechanics , geotechnical engineering , physics , politics , political science , law , engineering
Short‐time creep recovery tests in two‐point bending were performed on hardened cement paste beams water‐cured at #100° and 25°C. The experimental variables were pore structure, equilibrium moisture content, and temperature. The recovery curves were analyzed using linear viscoelastic concepts, which revealed a transition in the time range 0.2 to 10s which is both linear with stress and reproducible. A lognormal distribution of retardation times characterizes the transition. It is tentatively proposed that internal redistribution of capillary water is responsible for the transition. Experimental observations which support this view are: (1) The size of the transition increases with increasing amounts of capillary water for saturated pastes; (2) the transition strength decreases greatly when the capillary water is removed; (3) the apparent activation energy of the transition (3.8 kcal/mol) agrees well with that for viscous flow of water.