CT 201 - Sample Prep Flashcards

1
Q

Sieving thoroughness for a mechanical shaker is satisfactory if less than ___________ percent of the sample passes any one sieve by hand sieving after the specimen has been agitated in the mechanical shaker.

A

0.5%

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2
Q

Circle the best description of appropriate hand sieving.

A

A. Use a laterial and vertical motion
B. Provide a jarring action
C. Keep the sample moving over the sieve at all times
D. All of the above

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3
Q

Sample splitters shall have an _________ number of chutes.

A

Even

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4
Q

The minimum width of the splitter chutes should be approximately __________ larger than the maximum particle size.

A

50 percent

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5
Q

Sample splitters for coarse aggregate should have a minimum of ________chutes.

A

8

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6
Q

Sample splitters for fine aggregate should have a minimum of ________ chutes.

A

12

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7
Q

When air drying a sample, the max temp should not exceed ___________.

A

140 deg. F

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8
Q

A sample has been sufficiently dried for splitting when _____________.

A

The portion passing the No.4 sieve flows freely.

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9
Q

Approved methods for removing coatings from coarse agg and breaking up clods include ____________.

A

Using a mortar and rubber covered pestle, Using a soil pulverizing apparatus, washing the sample

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10
Q

Which test method governs adjusting gradings?

A

CT 105

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11
Q

Sample splitters are preferred over hand quartering.

A

True

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12
Q

The rate of discharge from the chutes should provide ____________.

A

A continuous rate of flow

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13
Q

When hand-quartering samples weighing more than 100 lbs., why may it be necessary to moisten the sample?

A

To prevent segregation

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14
Q

How is a stick or pipe used when quartering samples weighing more than 100 lbs.?

A

It is inserted beneath the canvas to divide the sample into two equal parts.

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15
Q

If the sample has been separated into basic sieve sizes, it is permissible to scoop material from the basic sieve sizes without splitting.

A

True

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16
Q

Excess portions of the sample that remain after splitting should be immediately discarded.