Assessment of Shear Strength of Geoploymer Concrete; A new approach to modify the Mohr-Coulomb failure envelopes

The shear stress is evaluated as the functions of principal stresses produced under maximum stress conditions in the verge of the failure. Shear strength of Geopolymer concrete is evaluated by functions of failure envelopes under generic conditions may provide the higher value. The stress functions and conditions in Mohr-coulomb (MC) failure envelopes for isotropic materials are modified due to asymmetrical stress functions owing to anisotropic characteristic of the concrete.Several modifications have been incorporated over the basic failure envelopes depends on the practical significances and material properties. The analytical approach is introduced to evaluate the shear strength of Plain and Prestressed Geopolymer concrete by modified Mohr-Coulomb‘s (MMC)failure envelopes and substantiated with relevant code of practice for conventional concrete