Compressive Strength and Hydration Process of Self Compacting Concrete (SCC) mixed with Sea Water, Marine Sand and Portland Composite Cement

As the world's largest archipelagic state, Indonesia consists with more than 18,000 islands and over 7.9 million square kilometres of sea. This present study is a part of research work to accelerate the sustainable infrastructure development in distant islands in addressing the lack of infrastructure and environment issues. The utilization of sea water and marine sand can reduce the consumption of fresh water and river sand, therefore decrease the price of concrete work in the low land areas and the distant islands those lack of clean water and mountain sand or river sand. The numbers of skilled workers in the construction industry are not enough, especially in the distant islands. Meanwhile, the production of durable concrete structures requires an adequate compaction by the skilled workers. One solution to overcome the shortage of the skilled workers is the application of Self Compacting Concrete (SCC). SCC is a fresh concrete that can flow under its own weight with maintaining its homogeneity to completely fill the mold without vibration or compaction energy [3]. \ud In order to contribute a cleaner environment and to achieve material saving through the recycling of waste materials such as fly ash, many cement factories produce the blended cement containing of fly ash such as Portland composite cement [1,2]. This paper report a part of ongoing investigation that focus to achieve an optimum correlation between sea water, marine sand, cement, coarse aggregate, Portland composite cement in production of high performance of SCC. The testing result on the mix design, workability (slump flow, segregation), compressive strength, modulus elasticity and hydration of SCC were discussed.In order to eliminate the main problems of shortage of clean water and fine aggregate in the low land areas and the distant islands, this research utilized sea water and marine sand and Portland composite cement to produce high performance of Self Compacting Concrete (SCC). Portland composite cement containing of fly ash. The evaluation result on the mix design, workability (slumpflow, segregation), mechanical properties (compressive strength-static modulus) and hydration process of SCC were discussed