Climate resilient reinforced concrete structures in coastal environments: Bangladesh Case Study

Abstract

Future changes in climate can have a direct impact on concrete structures especially in the coastal regions by means of increased rates of physical and chemical deterioration processes and increased environmental loading caused by extreme weather events. Adaptation to climate change involves understanding the implications of changes in environmental conditions on existing concrete structures and modifying specifications and standards to design resilient and durable concrete structures. This paper reports the outcome of research project funded by ReCAP (UK AID) to investigates various environmental factors that contribute to the deterioration of concrete s in the coastal region of Bangladesh and identify solutions to improve the durability of concrete to resist environmental loading for the intended design life of the structure. Condition survey of bridges in the coastal districts indicated that the concrete structures were deteriorating rapidly (within 10-15 years of construction) due to exposure to aggressive marine environment, issues related to poor workmanship, limited availability of good quality materials and lack of awareness on good construction practices. The paper reports on the outcome of an experimental investigation on the performance of local materials aimed at developing concrete mixes which will provide enhanced durability of concrete in future. 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)