Effectiveness of polymeric and cementitious materials to secure cracks in concrete under diverse circumstances

Concrete structures are deprived of flexibility, resilience from deformation and rigid nature and has higher compressive strength rather than tensile strength. Due to this, the volumetric and environmental changes that occur results in the formation of cracks. Cracking is the initial sign of distress in concrete and a proper monitoring and repair methodology can solve the problem. Concrete and mortar when used to fix cracks do not adhere well to the surface of old concrete and poses minimal strength. The present paper reports an extensive study on the usage of hydraulic cement, polyurethane, epoxy and acrylic resin modified mortar as crack repair materials under various real-life scenarios and crack conditions. Based on the study the best suited material for various distinct external circumstances and nature of crack are reported. It is observed that each material performs uniquely under different circumstances with epoxy adhesive being viscous, could penetrate concrete cracks and voids easily thus securing cracks efficiently. Epoxy adhesive shows high resistance towards freeze and thaw cycles, acidic environment and better mechanical strengths, however acrylic resin modified mortar and hydraulic cement shows better resistance towards fire. Polyurethane is best suited for sealing of non-structural cracks.

Automated summary

Concrete structures are prone to cracks, and suitable repair materials should be chosen based on different crack conditions and environmental factors. The study found that epoxy adhesive is effective in penetrating concrete cracks, while polyurethane is best for sealing non-structural cracks. Acrylic resin modified mortar and hydraulic cement show better resistance to fire.