Mechanisms of Degradation of Portland Cement-Based Systems by Sulfate Attack.
Mechanisms of Degradation of Portland Cement-Based
Systems by Sulfate Attack.
(644 K)
Ferraris, C. F.; Clifton, J. R.; Stutzman, P. E.;
Garboczi, E. J.
Chapter 22;
Mechanisms of Chemical Degradation of Cement-Based
Systems. Proceedings of the Materials Research Society's
Symposium on Mechanisms of Chemical Degradation of
Cement-Based Systems. November 27-30, 1995, Boston, MA,
E & FN Spon, London, England, Scrivener, K. L.; Young,
J. F., Editor(s)(s), 185-192 pp, 1997.
Keywords:
portland cement; degradation; sulfate attack;
microstructure; mortar; environment influence
Abstract:
Although the chemical mechanisms of sulfate attack have
been studied by many researchers, considerable
disagreement exists over the mechanics of the associated
expansion and cracking processes. Studies were carried
out by exposing mortar and concrete specimens of
different geometries (prisms, cylinders, and spheres) to
sodium sulfate solutions with controlled pH.
Relationshios between the formation of reaction products
and the expansion of portland cement mortars were
investigated by idenfigying the reaction products
present as a function of attack depth and amount of
expansion. Simulation modeling based on a finite
element approach is being performed to elucidate the
mechanics of cracking induced by sulfate attack.
