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Unformatted text preview: Amount M a te r ial F ine r T han 75mm Sieve
ASTM C 117 Tim Boyer CM 442 P re-L ab Pu rpose
The purpose is to provide a method of "wet sieving" which is more effective and complete than "dry sieving". Although more effective, "wet sieving" is used in conjunction (always before) with "dry sieving" (in this case ASTM C 136) to obtain material finer than 75 micrometers. Equipment
Balance readable to 0.1g Sieves one a 75 micrometer sieve and the other a 1.18 milimeter sieve Container large enough to cover the sample and allow agitation without loss of water Oven sufficient size, able to maintain 110C Wetting Agent i.e. dishwashing agents P rocedure
Procedure A Dry sample and determine mass to nearest 0.1% of the mass of the test sample Place test sample in the container and cover with water Agitate sample to separate all particles finer than 75 micrometers from the coarser so that the fine particles are in suspension Immediately pour water over sieves (coarser on top) Add a second charge of water, agitate and decant Repeat until water is clear Dry washed aggregate at 110C Determine mass to 0.1% or original mass Procedure B Dry sample Place in container Cover with water (with wetting agent) Agitate Pour over sieves Add a second charge of water (without wetting agent), agitate and decant Repeat until water is clear Dry washed aggregate at 110C Determine mass to 0.1% or original mass Post-L ab Test Conditions
A wetting agent was not used in this experiment. The aggregate was placed in a pan and r insed and allowed to f low off the edge into the sieves. Results
After drying, the mass of the bowl and sample was 1886.1g. Comments
The only deviation was that the aggregate was placed in a pan for r insing instead of in a bucket. ...
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- Spring '08