This project proposed to find a proper mix ratio producing prestressed concrete pipe diameter is equal to 600 mm tube 1 m high and 75 mm is the thickness of the cooperative mongkhon buri RAM factory original conditions of the manufacturing process is a combination of sand and water ratio that is used in the production of the Dai.From the employee's prognosis that the bird routes to work, the employee is changing roles, working every day to make our pipes, concrete mixing ratio in each day's stage are not the same with your skilled employees. The experiments were made to keep the examples of concrete with sand and water mixture ratio of different mixing ratio of tested the 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) in which the results of the experiment, know early 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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