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bdcs > material properties > Flashcards

material properties Flashcards

1
Q

accelerator admixture

A

calcium chloride

speeds up setting time

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2
Q

air-entraining admixture

A

resin, fat or oil
resists freeze/thaw damage
increases workability
light-weight, non sturctural

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3
Q

retarder admixture

A

starch, sugar, acid

slows down setting time

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4
Q

waterproofing admixture

A

stearate compounds

decreased permeability

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5
Q

water-reducing admixture

A

organic compounds

reduce water content

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6
Q

workability agent admixture

A

powdered silica or lime

improves workability

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7
Q

Type M morar

A

highest compressive strength

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8
Q

Type S mortar

A

second-strongest in compression; also resists lateral forces so good in underground applications

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9
Q

Type N mortar

A

most common; medium strength

use in interior and reinforced exterior walls

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10
Q

Type O mortar

A

weakest

use for non-load-bearing and re-pointing - very workable

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11
Q

SW brick

A

severe weathering (cold climate)

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12
Q

MW brick

A

moderate weathering (temperate)

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13
Q

NW brick

A

negligible weathering (warm climate)

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14
Q

FBX brick

A

most perfect in dimension and uniformity of color

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15
Q

FBS brick

A

middle-tier - wide range of color and greater dimensional variation

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16
Q

FBA brick

A

least uniform in size and color

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17
Q

outdoor-appropriate mortar joints

A

weathered
concave
vee
flush

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18
Q

indoor-appropriate mortar joints

A

raked

stripped struck

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19
Q

metal finish: anodized

A

aluminum coated with protective oxide layer through an electrolytic process

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20
Q

metal finish: galvanizing

A

coating iron or steel with a protective layer of zinc by immersion in a molten bath

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21
Q

plainsawn wood

A

most common
highest yield
grain varies; distorts in various ways

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22
Q

quartersawn wood

A

finish application; little distortion

wears evenly

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23
Q

seasoned wood moisture content

A

19% or less

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24
Q

air dried wood moisture content

A

10-20%

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25
Q

kiln dried wood moisture content

A

10%

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26
Q

exterior plywood

A

for permanently exposed locations

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27
Q

exposure 1 plywood

A

fully weatherproof glue but lower quality veneer than exterior grade
structural sheathing/subfloor

28
Q

exposure 2 plywood

A

use only where fully protected from weather

29
Q

wood treatment: insects

A

creosote
proper ventilation and good drainage
pressure-treat (don’t surface treat)

30
Q

wood treatment: decay

A

keep dry and ventilated OR submerged

use decay-resistant species or pressure-treating

31
Q

wood treatment: fire

A 
chemical impregnation (cadmium phosphate)
surface treatment (intumescent paint)
32
Q

Type I cement

A

normal - most common

33
Q

Type IA cement

A

normal, air-entraining

34
Q

Type II cement

A

moderate resistance to sulfite attack - used in contact with water that contains sulfites)

35
Q

Type IIA cement

A

moderate resistance to sulfites and air-entraining

36
Q

Type III cement

A

high early strength

37
Q

Type IIIA cement

A

high early strength

air entraining

38
Q

Type IV cement

A

low heat of hydration (for massive structures)

39
Q

Type V cement

A

high resistance to sulfite attack

40
Q

super-plasticizer admixture

A

organic compounds

make flowable

41
Q

fly ash admixture

A

increased strength, decreases permeability, reduces heat of curing, improves sulfite resistance

42
Q

silica fume/micro silica admixture

A

finer than portland cement

high strength, low permeability

43
Q

blast furnace slage admixture

A

byproduct of iron manufacture

improves workability, strength, less permeable, lower curing temperature, sulfite resistance

44
Q

pozzolan admixture

A

reacts with calcium hydroxide - cementing

45
Q

corrosion inhibitor admixture

A

reduce rebar rusting - use where deicing salt is applied

46
Q

fibrous admixture

A

short glass or steel fibers - microreinforcing

47
Q

freeze-protection admixture

A

allows curing at temperature as low as 20

48
Q

extended set-control admixture

A

delay curing up to 7 days

49
Q

annealed glass

A

cooled slowly

prevent locking in of thermal stress

50
Q

tempered glass

A

reheated annealed glass - surface cooled fast, core more slowly
resists thermal stress and bending/impact
breaks into granules
exterior, ceiling, impact

51
Q

heat-strengthened glass

A

similar to tempered but weaker
strong in bending, resists thermal stress and impact
breaks more like annealed than like tempered

52
Q

laminated glass

A

transpaent polyvinyl sandwiched between glass
not as strong as annealed
polyvinyl holds if glass breaks - skylights/high
good sound barrier

53
Q

security glass

A

bullet-proof laminated glass

54
Q

fire-rated glass

A

resists passage of smoke, heat and flames for specified time after exposure
tempered and 20 min rated

55
Q

wired glass

A

wire mesh rolled into a sheet of hot glass
holds together when broken
fire rating of 45 min

56
Q

patterned glass

A

hot glass rolled with a texture
distorts image; mostly decorative
may be tempered

57
Q

fritted glass

A

surface imprinted with silk-screened ceramic paint that is dried and fired on

58
Q

spandrel glass

A

opaque - used in curtain walls over structure
made with full frit on interior
tempered to resist thermal stress

59
Q

tinted or reflective-coated glass

A

reduces glare and cuts solar gain
tint is a chemical additive
reflective is a metallic film

60
Q

insulating glass

A

multiple panes with air gaps

acoustic control, insulation, and moisture control

61
Q

low-e glass

A

thin metallic coating - view almost unobstructed; certain wavelengths reflected

62
Q

metal finish: powder coating

A

resins/pigments electircaly charged and sprayed on

63
Q

alkyd paint

A

synthetic resin - replaced oil varnish, paint and adhesive

64
Q

float glass

A

annealed - heated and cooled slowly for strength

most common

65
Q

heat-absorbing glass

A

tinted to absorb solar radiation - transmits less heat and glare to inside
usually colored

66
Q

safety glass

A

laminated glass in cars and skylights

67
Q

bulletproof glass

A

laminated glass; 4+ layers with 3+layers plastic

bdcs (2 decks)

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