Thermal and Thermomechanical Analysis of a Cylindrical Cementitious Plug Hydrating in a Borehole

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Title: Thermal and Thermomechanical Analysis of a Cylindrical Cementitious Plug Hydrating in a Borehole

Author(s): C. Gotsis, D.M. Roy, P.H. Licastro, and S. Kaushal

Publication: Special Publication

Volume: 95

Issue:

Appears on pages(s): 49-70

Keywords: cements; compressive strength; expansion; heat of hydration; hydration; models; shear stress; shrinkage; stresses; temperature; tensile strength.

Date: 10/1/1986

Abstract:
Thermal analysis was made of the effects of hydration of cylindrical configuration specimens of a slightly expansive cementitious mixture. This simulated a cylindrical borehole plug, and with modification, may be applied to other cylindrical configurations. Inputs were made to the computer program ATHENAN developed to assess the thermal history of cylindrical domains with symmetrical thermal loads. Inputs to the program were the experimental isothermal rates of heat-evolution of the cementitious mixture measured at several temperatures. Using the temperature history from ATHENAN and experimental data from the volume change and mechanical properties of the cementitious mixture in the computer program SAPIV, a stress analysis was performed, which showed that tensile stresses at the interface may arise at the early stages of hydration when the cementitious mixture tends to shrink, while small compressive stresses are present at long times in such materials when the cementitious mixture tends to expand.