英文摘要 |
Concrete cracks increase significantly in the surface porous structureof under high temperatures or fire damage. In this study, we investigatethe different grout ingredient proportions including epoxy, harder contentand the appropriate amount of diluent agents in grout. We then use directpressure impregnation to fill the cracks in the fire-damaged concrete. Therepair efficacy was used to assess the efficiency of compressive strengthand tensile strength for the different degrees of fire-damaged concrete.The results of this research showed the ingredient materials of epoxy groutwas the ratio of epoxy resin:diluents agent:hardener = 90:10:50 (weightratio) under the impregnation pressure of 0.12 MPa for 60 min. Theingredient of epoxy grout obtained a great recovery effect to repair thecracks for concrete damaged by fires of 500°C to 700°C. |