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chapter 10 Flashcards

concrete construction

1
Q

like masonry concrete doe not ?

A

burn

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2
Q

concrete also resist “” and the effects of contact w/ ‘’

A

insects/ soil

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3
Q

concrete is the hardened form of ‘’ produced form ‘’ coarse and fine ‘’ and ‘’.

A

cement, porland cement, aggregates and water

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4
Q

course aggregates include ‘’
fine aggregates include ‘’

A

gravel/stone
sand

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5
Q

what make up a large volume of cement

A

aggregates p. 257

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6
Q

types of admixtures OF CONCRETE are:
S/C - REDUCED DENSITY
S-P- COLORING

A

shale or clinker - reduce density of concrete
super-plasticizers
coloring

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7
Q

any adhesives material or variety of materials which can be made into paste w/ adhesives and cohesive ro bond inert aggregate materials into solid mass chemical hardening

A

cement

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8
Q

particulates materials used to provide a stable blend bedding or reinforce a composition material. Used as an extender in concrete can be graded into course and fine grain sizes and material types, including sand, gravel, and stone

A

aggregates

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9
Q

ingredients or chemicals added to concrete mix to produce to make concrete w/ specific characteristics

A

admixtures

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10
Q

What ‘’ admixtures is used w/ concrete or mortar mix to make it workable , pliable and soft while using relatively little water, flow more easily

A

super-plasticizers

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11
Q

types of concrete include:
SC
SLC
ILC
G
HES
E
WPC

A

ordinary stone concrete
structural lightweight
insulating lightweight
gypsum
high early strength
expansive
water-permeable

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12
Q

concrete walls and slabs act as good

A

fire barriers

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13
Q

concrete is widely used for what kind of construction

A

type 1 fire resistant

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14
Q

primary ‘’’ of concrete:
produced fro locally available and low cost raw material
noncombustible
performs well under mild to moderate fire conditions
good insulating properties p. 258

A

advantage

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15
Q

like masonry, concrete is strong in ‘’ but weaker in ‘’

A

compression /tension

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16
Q

untimate compressive strength can range from

A

2500-6000

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17
Q

’’’ concrete includes componets added to the concrete before it hardens to resist tensile force.

Concrete that is internally fortified with steel reinforcement bars or mesh placed within the concrete before it hardens is called ‘’’’

A

reinforced concrete

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18
Q

reinforcing components can include:
R
WM
FG A

A

rebar, wire mesh or fiberglass additives p259

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19
Q

rebar size are commonly referred to by a standardized ‘’, what is the most common size

A

number , 5 .625 inch

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20
Q

concrete beams are frequently cast in the shape of

A

T

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21
Q

what is put at the bottom of a concrete beam to reduce tensile force

A

reienforced steel

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22
Q

vertical reinforcing bars are known as ‘’, they provided to resist the “”” tension and resist bending forces in the column from such sources as wind and settling

A

stirrups
Diagonal
.260

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23
Q

when a concrete beam or floor slab supports a load, the concrete in the part of the beam in tension is doin what

A

no work

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24
Q

Stress introduced to the concrete before the load is applied accomplished by tenting reinforcing bars before the concrete gets poured

More efficient use of concrete than ordinary, reinforcing this technique titans preloads the reinforcing steel, adding compressive stresses to the surrounding concrete

A

prestressing

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25
2 common methods of prestressing concrete are
pretensioning and postensioning
26
what should not be cut during FF opts unless necessary to rescue trapped victims
reinforced steel
27
what is like to happen if post tension reinforced steel is cut in concrete
to spring out of concrete, they are like big rubber bands p. 261
28
uses steel strands ( cables stretched b'tw anchors producing tensile force in the steel is ?
pretensioning
29
uses reinforcing steel cables that are not tensioned until after the concrete has hardened to certain strength
posttensioning p. 262
30
what type of concrete system may be more vulnerable to failure than ordinary reinforced concrete
prestressed concrete
31
systems use reinforcing cables and rods made of high strength steel that can yield as temps as low as
752
32
prestressed concrete will fail sooner than
conventional reinforced assembly
33
what is placed in forms and cured away at a plant away from a job
precast concrete
34
what is placed in forms at the buildings site as a wet mass and hardens in prepared forms
cast in place concrete
35
most '' is proportioned at bulk plants and then mixed in a mixing truck enroute to the job site
cast in place
36
common application for concrete include
pavement , foundations , columns, floors , walls , concrete masonry units
37
during the curing process concrete will '' SLIGHTLY
shrink slightly
38
normal design strength is reach how what day ''' but theoretically, properly cured concrete continues to harden '''
28 Indefinitely at a gradual rate.
39
single most important factor in determining the intimate strength of concrete is the '' to '' ratio
water to cement
40
if to much what is added to the mix what happens
water concrete doesn't reach desired strength
41
hardening of concrete involves the chemical process known as ''. in which water combines w/ particles of cement to form a microscopic gel
hydration
42
during hardening of concrete , heat is given off by chemical process
heat of hydration
43
in the process of curing the correct temp is required which is ideal between
50 and 70 "
44
concrete above 100 will not what
reach its proper strength
45
concrete cured at freezing temps willN HARDEN '''
harden more slowly p. 264
46
method of evaluating the moisture content of wet concrete by measuring the amount that a small cone shaped sample of the concrete stumps after it is removed from a standard sized test
slump test
47
concrete with high moisture content has greater '' than dryer concrete
greater slump
48
uses small test cylinders of a concrete batch to determine the COMPRESSION strength of that batch
compression testing * most costly p. 265
49
''' of concrete assembly is affected by such variables as: density thickness quality load depth over the reinforcing bars
fire resistance
50
what concrete has a lower density than ordinary concrete and had a lower thermal conductivity which acts as a better insulator against heat
lightweight concrete
51
non resistive members supporting concrete floor slabs or wall panels precast walls panels horizontally braced with exposed steel roof beams opening in concrete slabs / walls w'o rated assembly protecting the opening force of an explosion p. 266 ARE fire resistance of concrete assemblies THAT ARE ?
COMPROMIZED
52
expansion of moisture w/in concrete when heated or frozen is ( weakens concrete and exposed steel to fire )
spalling
53
concrete tends to retain heat of an exposing fire and release it slowly, in an effect called
heat sink effect
54
a simple system that consist of a concrete slab Supported by concrete columns.( 6-12 inch ) ( good for building supporting HEAVY loads.. ''''''' Sheer stresses developing concrete where slabs intersect the supporting column and a building that will support heavy live loads. The area around the column is a reinforced with additional concrete in the form of drop panels or mushroom capitals. ''''''''''' (same as above) If the building will support LITE loads this additional reinforcement is not necessary. The system is then known as '''''
flat slab concrete frame Flat plate
55
Plain floor slab about 8 inches thick that rests on column spaced up to 22 feet apart and depends on diagonal and orthogonal patterns of reinforcing bars for structural support because the slab lacks BEAMS : simplest and most economical floor system
flat plate p. 267
56
what type of beam frame consist of concrete slabs supported by concrete beams also called Concrete joist construction
slab and beam ( light floor loads) 2 inch thick
57
what are highly susceptible to fire damage because of slab thickness
slab and beam 2 IN..
58
when concrete beams run one way its know as
one way reinforced slab
59
slab and beam concrete framing featuring concrete beams running 2 ways is know as
2 way slab construction * looks like waffle ) also called waffle construction
60
when is slab and beam concrete framing used when '' are short and '' are high.
when spans are short and floors are high
61
''' structural shapes included: slabs wall panels columns p. 268
precast
62
advantages to using ''' higher degree of quality possible than cast in place work can be proceed faster polystyrene core improves insulating
precast concrete:
63
major disadvantage of concrete
transporting it and cost for it p. 269
64
'''' systems can be cast in standard shapes including: solid slabs hollow core single try double tee slabs
precast floor
65
common form of construction used w/ precast concrete, reinforced wall panels are cast at the job site in horizontals casting beds, after cured a crane tilts the wall panels up''' also known as '''
tilt up construction Tilt slab Construction
66
a variety of techs such as ''' can be used to connect precast structural components to each other
bolts, welds, and posttensioning p270
67
precast concrete is commonly used in construction of
parking garages,
68
choices of material used in curtain wall may be influenced by style, thermal properties and cost material may include: A G S M
alumna , glass, steel and masonry. 271
69
Examples of details that are difficult to determine after construction /?
ordinary reinforcing vs psotention cast in place vs precast stucco vs concrete
70
supports for precast beams by include
corbels ( brackets ) short steel beams cast into poured colums p. 272
71
What is an example of a reason to add coloring to concrete? (p. 258)
Indicate buried electrical cables
72
What uses steel bars placed in formwork and concrete is placed in the formwork around the bars... concrete must be properly compacted as it is placed in the forms to surround the reinforcement bars and avoid cavities in the Harding concrete... what are used to ensure that the concrete fills the space within the framework?
Ordinary reinforcing Mechanical vibrators 259
73
Reinforcement allows concrete to resist which type of forces?
tensile force
74
Vertical reinforcing bars are designed to resist what type of tension?
Diagonal tension
75
What is the simplest and most economical floor system used in concrete buildings? (p. 266
flat plate
76
In a flat-slab concrete frame, what range of thicknesses may be used?
6-12 inch
77
Precast concrete sandwich panels have which type of core? Disadvantage?
Polystyrene Expensive transport
78
Solid slabs are used for short spans up to ''' while slabs can be used for spans up to '''
30 120
79
In the simplest of precast design, precast slab simply rest on '''' or ''' simple designs of this type, not inherently, rigid and laterally tied together to resist horizontal forces
Bearing wall column
80
What kind of support for precast beams can be cast into concrete columns?
Corbel
81
Ordinary''''' uses steel bars placed in wet concrete and place in the foam mark around the bars.. the design engineers must specify the number of reinforcing bars to be used their size and the depth of the concrete cover around the bars
Reinforcing
82
'''' Columns and beams are typically left exposed.... '''' products may be either pretension or post tension... And the simplest of''''''slab simply rest on the bearing wall or columns simple designs of this type are not inherently rich, and the slabs need to be laterally tied together to resist horizontal forces.
Precast concrete

Building construction (12 decks)

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