10:00 AM - 10:15 AM
[SCG63-05] Mechanical response of polycrystalline rock during hydration reactions –Experimental investigation of reaction-induced stress and strain in CaSO4-H2O system–
Keywords:Reaction induced stress, Hydration reaciton, Mechanical behavior
Although the samples have high porosity (ø = 20–35%), direct measurement of reaction-induced strain under constant load experiments revealed that reaction-induced bulk strain does occur under loadings of 0.01–10 MPa. The increase of loading enhances deformation mechanisms such as pressure-solution creep, and the amount of reaction-induced bulk strain decreases. Constant volume experiments revealed that reaction-induced stress increases linearly with reaction rate. These results suggest that the mechanical behavior during hydration reaction is primary controlled by the competition between the reaction rate and deformation rate.