This project proposed to find a proper mix ratio of prestressed concrete pipe manufacturing.The diameter is equal to 1 m high and 600 mm tube thickness 75 mm of the cooperative mongkhon buri RAM factory. The original state of the manufacturing process is a combination of sand and water ratio that is used in the production of the employee's prognosis. Which birds process to work, the employee is changing roles, working every day to make our pipes, concrete mixing ratio in each day.Step on the expertise of the trial made by the employee to collect examples of concrete with sand and water mixture ratio is different, tested.Find the ratio of sand and water that is suitable for the production of prestressed concrete pipes for this. Based on the hypothesis of ANOVA design with 2 ^ 2 factorial design (Analysis of Variance with 2 ^ k Factorial design). The result of the experiment, which indicates the morning. The appropriate mix ratio is 4 buckets of sand and water tank 7 mixing ratio is appropriate is 4 buckets of sand water tank 9.
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