Exam

Question 1

Is the weight per unit volume of a material

Answer 1

Specific Weight

Question 2

Is acceleration due to gravity, usually given in m/s2, and on Earth usually taken as 9.81 m/s2

Answer 2

standard gravity

Question 3

Common symbol for specific weight

Answer 3

γ, the Greek letter Gamma

Question 4

The specimens are dried in an oven for a specified time and temperature and then placed in a desiccator to cool.

Answer 4

Water absorption test

Question 5

There are two basic test procedures- Method A and Method B. The more common being Method A, can be used with sheet, rod, tube and molded articles. For Method A, the specimen is weighed in air then weighed when immersed in distilled water at 23°C using a sinker and wire to hold the specimen completely submerged as required. Density and Specific Gravity are calculated.

Answer 5

Density and Specific Gravity ASTM D792

Question 6

CHEMICAL PROPERTY EXAMPLES

Answer 6

 Flammability
 Toxicity
 Acidity
 Reactivity
 Heat combustion

Question 7

Is the mass per unit volume of a material

Answer 7

Density

Question 8

Factors affecting water absorption

Answer 8

 Type of plastic
 Additives used
 Temperature
 Length of exposure

Question 9

Typically measured in kg/m3

Answer 9

density of the material

Question 10

For the water absorption test, the specimens are dried in an oven for a specified time and temperature and then placed in a desiccator to cool. Immediately upon cooling the specimens are weighed. The material is then emerged in water at agreed upon conditions, often 23°C for 24 hours or until equilibrium. Specimens are removed, patted dry with a lint free cloth, and weighed.

Answer 10

ASTM D570

Question 11

The change of one type of matter into another type (or the inability to change)

Answer 11

Chemical Properties

Question 12

Always produces one or more types of matter that differ from the matter present before the change

Answer 12

chemical change

Question 13

Defined as mass per unit volume

Answer 13

density of the material

Question 14

Is a characteristic of matter that is not associated with a change in its chemical composition

Answer 14

Physical Properties

Question 15

Is described as the behavior of the construction element against destructive influences due to scraping, rubbing, skidding, or sliding of the object on the surface, which leads to surface erosion.

Answer 15

Abrasion

Question 16

Is a measure of the ratio of mass of a given volume of material at 23°C to the same volume of deionized water

Answer 16

Specific gravity

Question 17

PHYSICAL PROPERTY EXAMPLES

Answer 17

 Density
 Color
 Hardness
 Melting and Boiling points
 Electrical Conductivities

Question 18

Also known as the unit weight

Answer 18

• Specific Weight

Question 19

General Properties of Materials

Answer 19

Physical Property and Chemical Property

Question 20

Is defined as the amount of water absorbed by a material and is calculated as the ratio of the weight of water absorbed to the weight of the dry material.

Answer 20

Water Absorption

Question 21

A specimen is placed with the surface to be tested at a distance of 3 in. from the nozzle. The specimen is then clamped and a shield is attached. Sand is blasted on the test surface for a period of 1 minute. This procedure is repeated on at least eight spots on the test surface. Modeling clay is then used to fill in the abrasion cavities and then leveled. The mass of the clay supply is determined before and after the cavities are filled. This mass difference can be used to calculate the volume of each abrasion cavity.

Answer 21

ASTM C418

Question 22

Are also used for relative density

Answer 22

specific gravity, and less often specific weight