The objective of the study was to evaluate the pressure exerted by frozen manure caps on the walls of concrete manure tanks. The research is aimed at improving design criteria for concrete manure tanks for cold climates. Scale models were used to determine the pressures exerted by ice caps resulting from 2% and 4% solids swine manures and to compare them to that exerted by a fresh water ice cap. For typical Quebec conditions, the highest mean ice pressure measured in laboratory tests was equivalent to 72 +/- 13 kPa from liquid manure. The circumferential stress was influenced by the liquid type but not by the filling methods and was significantly lower for the manure ice caps than for water ice. However, no significant differences in stresses were attributable to the two levels of solids content of the manures. This implies that the stress differences observed between water and manure ice are mainly due to the presence of urea which would have an effect on the thermal expansion.
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