NETTCP Soil And Agg: Questions With Correct

NETTCP Soil And Agg: Questions With Correct

Solutions What do you need to do to prep a sample for a washed sieve analysis?Right Ans - - Dry until constant weight

• Dry in an oven at 230±9°F

How long do you wash the sample for? Right Ans - Until the water is clear What sieves do you use for washing? Right Ans - A sieve between #8-16 and a 200 sieve.What is lost during washing process? Right Ans - The fine aggregates What is the procedure for drying after washing? Right Ans - After washing, place the sample into the oven to dry at 230±9°F until constant weight.Record final weight to determine how much of the sample(fine) was lost.How do you calculate dry weight after washing? Right Ans - (Initial dry weight - Final dry weight)/(Initial dry weight) Procedure for sieve analysis after washing, drying, and weighing Right Ans

• Make sure sieves are in correct order

How long do you run the sieve shaker? Right Ans - Depends on sieving adequacy

• Holes in the sieves
• machine shaking ability
• shaking ability on machine

What is the frequency for sieve shaking by hand? Right Ans - 150 strokes per min How do you determine if you have too much material on a sieve? Right Ans

• Check the table
• determines max amount of mass per sieve
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