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Thermal/Strain History Effects on Creep of Refractory Concrete
Author(s) -
BRAY D. J.,
SMYTH J.R.,
McGEE T.D.
Publication year - 1982
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.1151-2916.1982.tb10443.x
Subject(s) - creep , materials science , refractory (planetary science) , temperature cycling , aluminate , cement , sintering , stress (linguistics) , composite material , deformation (meteorology) , metallurgy , thermal , thermodynamics , linguistics , philosophy , physics
A temperature and stress cycling technique was developed to examine the effects of thermal/strain history on creep of refractory concrete. Creep of a 90+% Al 2 O 3 refractory concrete and a high‐purity calcium aluminate cement was investigated under stresses of 3.4 to 20.7 MPa at 500° to 1200°C. It was found that on initial heat‐up of a cured specimen of either the concrete or cement, the ΔH c ∼130 to 170 kJ/mol. After subsequent cycling of the temperature, ΔH C ∼620 to 720 kJ/mol. The stress exponent for the initial application of stress was <1. For subsequent cycling of the stress n >2.5. It was determined from these and other results that multiple “deformation” processes are acting simultaneously on initial heat‐up of the form:These processes include crystallization, phase changes, sintering, stress‐aided sintering, and steady‐state creep. Mechanisms of creep and failure are discussed.