Experimental Study On The Corroded Reinforced Concrete Beam Bending Strength

Due to long-term coastal cities existing old buildings have long affected by large alkalinity rain and sea breeze, chloride ions get into the concrete or reinforced, serious erosion of concrete and reinforced, make reinforced premature corrosion, due to the reinforced corrosion expansion, destroy the bond between concrete and even separation of the concrete cover, seriously affect components bearing capacity, thereby seriously reduce the overall durability of concrete structures. In this paper, through the application of electrochemical principle, make 11 reinforced concrete beams those early immersion in 5% NaC l solution power accelerated corrosion. Through reinforced concrete beam normal section flexural bearing capacity test, reinforced tensile test, after corrosion reinforced durability test, geological radar detection and other experiments, successively measuring flexural bearing capacity of normal section of the steel bar corrosion test beam, around the reinforcement corrosion elongation and yield strength, reinforced durability detecting the electric current density after electrifying corrosion, concrete density after reinforcement corrosion, analysis that concrete test beams flexural bearing capacity situation after reinforcement corrosion, corroded reinforced mechanical properties change situation, corroded reinforced anti-corrosion situation, concrete change situation under the chlorine environment. Finally, combined with the above test analysis results, combined with the crack of reinforced concrete beam carried out appearance change situations in the loading process, after a comprehensive analysis of corroded reinforced concrete beams with change situations in corrosion rate, the protective layer thickness and other factors, to explore concrete affected, member carrying capacity and stiffness variation, impact protection layer thickness on test beam corrosion degree under different corros ion rates circumstances, impact protection layer thickness on test beam crack development situation. Through theoretical calculations and experimental data comparison, the results agree well. The results show that after the corrosion of reinforced concrete beam bearing capacity, ductility decreased with the increase of the corrosion rate, which a decrease in durability, the thicker the protection layer the lower the beam corrosion rate under the same electricity case, that the thickness of the protective layer decided to a great extent reinforced corrosion resistance, indicating that protection layer thickness largely determine reinforced anti-corrosion ability, in the same conditions, the thicker the protection layer the relatively better the durability, reveals reinforced concrete test beam durability degradation regularity.