The Experiment Research On Reinforced Concrete Component's Mechanical Properties In Salt Mist Environment

The coastal structures, bridges required salt to thaw ice and others structures exposed in adverse circumstances (such as salt-marsh, alkaline soil), are easy to be corrode by CL-, which leads the structures to be damaged early, and brings bigger harms to their safety, durability and reliability. The problem has been attracted extensive attentions and become a focus of researches. The majority researches on the corrosion completely based on the concrete structure components soaked in the sea water, but this kind of corrosion do not commonly happen in fact. What the coastal buildings suffered more are the chloride ions in the air.In this paper, in order to study the reinforced concrete structures built in salt mist environment, carrying the corrosion test with a salt mist hot and damp carbonization experiment chamber. The tested specimens are design to different water cement ratios and different protector thickness. The bearing capacity of the specimens at different corrosion periods is measured and the cracking processes, cracking loads, ultimate loads and deformation property under concentrated loads are analyzed. Especially, the influence of different concrete strengths and corrosion periods on ultimate load capacity is studied and the mechanism of salt mist corrosion is analyzed.The experiment proved that after corroded in the salt mist, the values of cracking load of reinforced concrete beams decrease first, then increase, and decrease in the end. What is more, the failure mode is the same as the un-corroded beams. The data show that reducing water cement ratio which enhances the protector thickness can enhance the concrete's resistance to corrosion in some extent and the slight rust of main steel have little influence on the ultimate load capacity.