Soil Engineering & Sampling

Question 1

Unconsolidated mineral materials at or near the earth’s surface which consist of ________, _________, and _______which maybe incorporated therein and which have resulted from natural process such as decay, weathering and other chemical action

Answer 1

soil, air, and, organic substances

Question 2

Natural or prepared mixtures consisting
predominantly of stone, gravel or sand containing
silt clay (______or passing _______) material

Answer 2

Soil Aggregates
0.075mm or #200 sieve

Question 3

Classes of Soil

Answer 3

Geological Soil
pedological Soil
Engineering Soil

Question 4

Engineering Classes of Soil

Answer 4

a. Granular or Coarse-grained soil
-gravel or stone, sand
b. Fine-grained soil
-silt, clay, colloids
c. organic soils

Question 5

good load-bearing quality
permeable: easy to drain, water easily absorbed

Answer 5

boulder (12”)
cobble(3”,12”)

Question 6

Gritty and loose grains, no plasticity, no cohesion. If dry, a cast formed in the hand will fall apart. If moist, a cast will crumble when touched.

Answer 6

Sand #200 #10

Question 6

rounded or angular, no cohesion, no plasticity, crunchy under foot.

Answer 6

GRAVEL/STONE #10 3”
coarse 1” 3”
medium 3/8” 1”
fine #10 3/8”

Question 7

Poor load-bearing quality, impermeable, compressible under sustained load, subjected to change in strength & volume due to variation in water content

Answer 7

Silt 0.002mm #200

Question 8

Can be made plastic by adjusting its water content, cohesive, exhibit considerable strength when air dried, difficult to crush in hands.

Answer 8

Clay 0.001mm 0.002mm

Question 9

Particles smaller than 0.001mm sieve

Answer 9

Colloids passing (0.001mm)

Question 10

• Dark color, foul odor, due to the presence of the decomposed plant matter.
• Unhealthy sewage-sludge odor.
• Found as deposits in swamps & peat bogs.
• Inferior than fine-grained soils as to the properties stated.
• Natural moisture content is 100%.

Answer 10

Organic Soils

Question 11

What does AASHTO & ASTM stands for?

Answer 11

• American Association of State Highway and Transportation Officials
• American Society for Testing and Materials

Question 12

Standard practice for sampling aggregates

Answer 12

T2

Question 13

Materials finer than 0.075mm (No. 200) sieve in mineral aggregates by washing (wash test)

Answer 13

T11

Question 14

Unit weight & Voids in Aggregates

Answer 14

T19/T19M

Question 15

Sieve analysis of fine & coarse aggregates

Answer 15

T27

Question 16

Specific gravity, absorption of fine, and coarse aggregates.

Answer 16

T84 & T85

Question 17

Dry preparation of disturbed soil and soil aggregate samples for test

Answer 17

T87

Question 18

Liquid limit determination

Answer 18

T89

Question 19

Plastic limit & plasticity index determination.

Answer 19

T90

Question 20

Percentage of wear

Answer 20

T96

Question 21

Standard proctor test

Answer 21

T99

Question 22

Modified compaction test

Answer 22

T180

Question 23

Sand cone method

Answer 23

T191

Question 24

California bearing ratio test

Answer 24

T193

Question 25

Sampling from roadway

Answer 25

3 approximately equal increments

Question 26

Sampling from a flowing aggregate stream

Answer 26

3 approximately equal increments

Question 27

Sampling from a conveyor belt

Answer 27

3 approximately equal increments

Question 28

Sampling from a windrow

Answer 28

combine 3 samples

Question 29

Sampling from stockpile

Answer 29

If coarse aggregates, 3 taken from top third, middle, and bottom third of the volume of the pile.

If fine aggregates, 5 increment taken anywhere from the volume of the pile.

Question 30

Sampling from a truck

Answer 30

9 portions from 3 trenches