Service Life Prediction Based on Carbonation Reliability Theory for Reinforced Concrete under Mechanical Load

Abstract

A carbonation model of reinforced concrete structures subjected to mechanical load based on experimental work is proposed in the paper. Correspondingly, a series of reliability analysis and service life prediction is carried out and reasonable results are acquired. Besides the effect of concrete cover, it indicates that mechanical load impacts the reliability and service life of the reinforced concrete structures significantly through example calculation. In the case of concrete cover of 40mm, the service life is shortened nearly half under a tensile load of 60% while the service life is lengthened 30% under a compressive load of 30%. In service life design or long term performance assessment, more work should be done with the consideration of the mechanical load effect.

Investigation on the Air Permeability and Pore Structure of Concrete Subjected to Carbonation under Compressive Stress

“…Many factors affect the concrete carbonation: water–cement ratio [ 1 , 2 ], supplementary cementitious materials [ 1 , 3 , 4 , 5 , 6 , 7 , 8 ], CO 2 concentration [ 9 , 10 , 11 ], relative humidity [ 9 , 12 , 13 , 14 ], and applied load [ 8 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. Much work based on the standard test methods and specifications has been carried out on concrete specimens in a load-free status without considering the effect of applied load.…”

“…A series of attempts have been made to study concrete carbonation damage under stress. Wan et al [ 18 ] and Tang et al [ 19 ] reported that the carbonation rate rises and then falls with compressive stress. Han et al [ 20 ] found that tensile stress deepened the carbonation depth, and compressive stress restrained concrete carbonation.…”