SERVICE LIFE ASSESSMENT OF R.C.C. SLABS

Abstract

Reinforced cement concrete (RCC) structures in an aggressive or salt laden environment deteriorate with time
due to chloride-induced corrosion of reinforcing bars. When the RCC slabs of structures are exposed to a very
aggressive environment, higher deterioration rates can develop. For new and existing RC slabs, the concrete cover forms
a necessary factor to prevent or delay the chloride-induced reinforcement corrosion causing the deterioration of
structural performance. Also the water cement ratio forms another important parameter affective the service life of RCC
elements. Several service life models are available for estimating the service life of reinforced concrete structures, viz
Life-365TM
, DuraCrete, Stadium, ClinConc etc. All the models are not applicable for all conditions and all structures
specifically when the environmental exposure conditions are complex. This paper proposes the application of service life
model Life-365TM for estimating the service life of RCC slabs exposed to chloride laden environment in service. The
parameters that are critical for the estimation of service life are identified and their role in designing service life is
evaluated. A parametric study with the help of Life-365TM is taken up which provides a systematic methodology to
determine the service life of RCC slabs which can help plan their maintenance schedules.