This project has examined the major factors that contribute to premature deterioration of concrete structures, develop cost effective concrete mix design to enhance the durability of future structures and make recommendations on improvements in construction practice and workmanship considered necessary to improve service life. This report compares the life-cycle cost analysis for three different concrete mixes, viz, LGED nominal mix 1:1.5:3 with stone aggregates, brick aggregates and recommended durable concrete mix containing 30% flyash. The cost analysis study for a sample structural element (deck slab of bridge/culvert) concludes that the recommended durable concrete mix fulfils the 75-year design life with no major repair costs. On the other hand, the current LGED specified concrete mixes incur repair costs, which is therefore not a cost-effective design for concrete structures in coastal regions of Bangladesh.
This work is part of the Applied Research on Rural Roads and Transport Services through Community Access Programmes in Africa and Asia (AFCAP2 and AsCAP)
Mott MacDonald (2018). Climate Resilient Concrete Structures in Marine Environment of Bangladesh, Cost Analysis Report. London: ReCAP for DFID.