Influence of the curing method on comprssive strength and porosity of concrete mixed with sea water, marine sand and fly ash

There many archipelagic state such as Japan, Indonesia and other countries. Indonesia consists of thousands of islands where many peoples live in the low land area, the distant and isolated islands that lack of clean water or fresh water and mountain sand or river sand.Transporting the fresh water or clean water and mountain aggregates or river aggregates for concrete production to the low land area, the distant and isolated islands will make the price of concrete work becomes more expensive. In order to overcome the problem of shortage of clean water and fine aggregate in the low land area, the distant island, and saving the fresh water over the world, this research seeks to use sea water and sea sand to produce concrete. In order to overcoming the continuous dumping of waste material, this research also uses semen containing wasted material such as fly ash. This research is a part of ongoing investigation that focuses to study the mix design), mechanical properties (compressive strength-modulus elasticity), porosity, and curing method in order to achieve an optimum correlation between sea water, marine sand, cement, river or mountain coarse aggregate in production of high performance concrete. Furthermore, it is important to conduct research on utilization of sea water, whose percentage is 97% of the total water on the earth, as an effort for improving the technology of saving fresh water.