The construction industry in Bangladesh is actively pursuing the goal of preserving the equilibrium between the amount of greenhouse gases (GHGs) produced and expelled from the atmosphere. An ideal way to reduce CO2 emissions from concrete production is the utilization of industrial by-products like class F fly ash, slag, etc. as supplementary cementitious materials (SCMs). On the other hand, reducing the life cycle cost (LCC) through the extension of service life could also be an effective way to reduce the overall carbon footprint of any RC infrastructure, particularly in saline exposure. Higher service life ensures lesser repair work for a corroded marine RC element and eventually results in reduced CO2 emission in the lifetime. Therefore, it is evident that producing concrete with proper proportions of SCMs and other mix parameters to achieve the desired service life can reduce both the initial and long-term carbon emission potential of an RC structure in saline exposures. With this end in view, a case study is presented where concrete mixes have been prepared using different binder types (both customized and commercially available composite blends) for a particular design strength commonly used in Bangladesh. The service life and repair frequency of an RC element made of considered concrete mixes have been predicted through the electrical resistivity of the mixes. LIFE-365 software has been used for the analysis. It has been found that commercially available CEM III and the blended mix of CEM I with 30% slag plus 20% fly ash exhibited prolonged corrosion initiation time, least repair requirements during the service life of 100 -years and consequently, lower LCC and overall CO2 emissions as compared to other mixes used. The outcome of the study thus necessitates the inclusion of required policies and guidelines in local construction supply chains and practices to reduce embodied carbon of RC construction.