Economical use of concrete in tropical climates

With the introduction of new varieties of blended cement in Sri Lanka, the choices available for the structural engineers for the selection of concrete for large buildings and other structures have improved. This is further strengthened with the introduction of various types of admixtures and additives in the recent times that would allow a wide range of desirable properties for fresh and hardened concrete. In order to obtain the maximum advantage of the new developments, it is useful for the structural engineers to obtain a greater insight into such diversity possible. Sri Lanka, being a tropical country that is experiencing some effects of global warming, there could be many additional considerations when the cement contents are high as for the high strength mixes. This paper will discuss some new developments in the cements, admixtures, additives as applicable to Sri Lankan scenario and would provide insight to economical selection of concrete grades and mixes to optimize the structural design of large buildings and structures to achieve cost savings while ensuring a robust and durable structure.Society of Structural Engineers, Sri Lank