Suggested Key Words: sprayable ECC, concrete repair, tunnel repair and retrofit
Non-Proprietary Description:Fiber-reinforced, strain-hardening cementitious composites which are capable of being pneumatically sprayed in conjunction with wet spray process, can be prepared by adding polymer fibers to a cement composition containing organic/inorganic admixtures (e.g., viscosity agent and superplasticizer). Compared to ordinary spray cementitious composites including fiber-reinforced mortar or concrete, the composite according to the invention displays enhanced pumpability and rebound property. The resultant sprayed composite has substantially improved tensile strain capacity with strain hardening behavior and self-controlled crack width, substantially improved flexural deformation capacity, and improved tensile strength |
