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Water use good and in accordance with regulation of concrete some cannot be achieved caused limited natural resources. As in the area of islands in the thousand islands where clean water is very difficult to get so in concrete construction using brackish water obtained from a residents well , so that is expected to approach water standard that is combined with a dock construction and hoped the plan construction could be achieved maximum age. In this research will be tested the use of the use of each side variables pdam and brackish water on a mixture of concrete with marinade sea water and tested strong tekannya concrete at the age of 28 days and 56 days on the quality of concrete plan k-250 test using objects concrete cube. The results are as follows: use brackish test results more powerful 1,92 % compared with the press plans, the testing companies use water PDAM 1.3 % lower than strong press plans at the age of 28 days. The age of 56 days on a concrete test their water PDAM use test 5,55 % higher compared with strong press the plan, in concrete a mixture of brackish water while the results of the decline or lower 13,48 % from strong press the plan. Of pictures 5.3 charts comparison strong press , concrete a mixture of water obtained PDAM strong trend of increase has complained bitterly , have concrete a mixture of brackish water while the trend of declining.

STUDI PENGARUH PENGGUNAAN AIR PAYAU DALAM MIX DESIGN BETON UNTUK PEMBUATAN KONSTRUKSI DERMAGA AKIBAT RENDAMAN AIR LAUT