2010 Construction and Material Specifications - Ohio Department of ...

3. 1 Pint non-absorbent container
4. 8 oz [240 ml] plastic cup
5. Stirring stick or spatula
6. Scale accurate to 0.1 g
7. Disposable gloves
8. Stop watch
9. Thermometer
10. Paint brush
B. Perform the test as follows
1. Assure the material and the room is at 73 °F [23 °C]
2. Determine and record the tare weight of the paper cup (1).
3. Introduce 100.0 grams of 20 - 30 graded sand (2) into the paper cup.
4. Record the weight of the cup and the sand.
699
705.25
5. Consolidate the sand in the cup by lifting the cup approximately ½ “ [13 mm]
and dropping 25 to 30 times. Then lightly tap the sides of the cup 25 to 30 times
with the fingers. The sample may also be placed on a vibrating table for 10 to 15
seconds.
6. Measure enough material into the 8 oz plastic cups (4) to make at least a 200
g sample.
7. Combine the components into the non-absorbent container (3) and mix
according to the manufacturer’s recommendations using a spatula or stirring stick
(5).
8. Pour 40.0g of material over the sand and record the weight of the resin, cup
and sand
9. Allow the resin, sand and cup to set undisturbed for 24 hours at 73 °F [23
°C]. Re-weigh the resin, cup and sand
10. Remove as much of the paper cup from around the hardened resin and sand
matrix as possible. Lightly brush any loose sand from the matrix. Weigh the
hardened matrix.
11. Calculate the percent of sand retained [F] as follows:
F = [E / (D-A)] x 100
[A] Tare weight of paper cup (g)
[B]Weight of cup and sand (g)
[C]Weight of fresh mixture of resin, cup and sand (g)
[D]Weight of cured mixture of resin, cup and sand (g)
[E]Weight of resin sand matrix as measured in step 10 (g)
12. Report the average of three specimens mixed separately