Effects of Dry Joints on Compressive Behaviour of Refractory Linings

摘要

To support optimization of refractory masonry structures, teh compressibility of dry joints of magnesia-carbon and magnesia-chromite bricks have been investigated. Laboratory scale tests, field measurements and finite element modelling have been performed. Measurements done in a wide temperature range have shown that the exponential form of the joint closure curve results from the gradual closure of initially non-parallel surfaces. The stress needed to close the joint was found to be broportional to the material stiffness. Temperature influences the joint closure by changing the stiffness of material and by reducing the initial joint gap due to thermal dillatation.