Dawn samrueng boonsawad treatment.Advisor: Professor vichai worth ornamentDisciplines: construction technologyAcademic year: 2558 Abstract This research aims to study the strength of the concrete mixing coal ash. And to learn to sift the mixture of sulfate of changes of coal ash concrete mixture ratio. For use in the design of mixture strength at the age of 3 days. A study done by the test set of a Portland cement type 1 water ratio per bonding material mixed fly ash and 0.55 has replaced cement size 35, 25, and 15 percent by weight of the materials bonding by control of fresh concrete collapsed value is between 3 – 5 cm with cast concrete size and size is 150x150x150 cubic millimeters, and test the strength of concrete at the age of 3 days, and then compare those research studies in the sea before ever before. The research found that, Yes, the coal ash in the higher doses resulted in loss of strength of concrete will cause infiltration of chloride. And corrosion of the concrete can be reduced if yes, coal ash in concrete t W/B equal to 0.55 in the range of 15% by weight and 25 and can increase the durability of the concrete in marine environment effectively.Key words: coal fly ash, concrete, strength, sea environment, the intrusion of chloride.
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