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136 Cards in this Set

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ACI
American Concrete Institute
PCA
Portland Concrete Association
ASTM C1064
Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete
ASTM C172
Standard Practice for Sampling Freshly Mixed Concrete
ASTM C143
Standard Test Method for Slump of Hydraulic-Cement Concrete
ASTM C138
Standard Test Method for Density (Unit Weight), Yield and Air Content (Gravimetric) of Concrete
ASTM C231
Standard Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method
ASTM C173
Standard Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method
ASTM C31
Standard Practice for Making and Curing Concrete Test Specimens in the Field
ASTM C1064

the sensor of the temperature measuring device shall have at least ___ in. ___ mm of concrete cover in all directions
3in, 75mm
ASTM C1064

the temperature measuring device shall have a capacity of measuring temperature of freshley mixed concrete to +- ___ degrees F [+-___ degrees C] throughout a range of ___ to ___ degrees F [___ to ___ degrees C]
+-1°F [+-0.5°C], 30 to 120°F [0 to 50°C],
ASTM C1064

the temperature measuring device shall be calibrated ___, or whenever there is a question of ___.
annually, accuracy
ASTM C1064

the temperature of concrete may be measured in a wheelbarrow
true
ASTM C1064

the temperature of concrete may be measured in a wall form
true
ASTM C1064

a composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temperature.
false
ASTM C1064

what must be done to the sample container prior to the sampling the concrete
the sample container must be dampened and moistened
ASTM C1064

what must be done to the concrete surrounding the temperature measuring device after the device is submerged in the fresh concrete
concrete must be gently pressed to keep air out
ASTM C1064

how long must the temperature measuring device remain in the freshly mixed concrete for an accurate reading
2 min or until stabilized
ASTM C1064

after the temperature of the concrete is read what is then required
record the temperature
ASTM C1064

complete the temperature measurement of freshly mixed concrete within ___ minutes after obtaining a sample
5
ASTM C1064

the temperature of the concrete is recorded to the nearest ___ degree F [___degree C]
1, 0.5
ASTM C1064

according to astm c1064 what is one reason to take the temperature of concrete
avoid future problems. ensure that it meeds specification requirements.
ASTM C1064

a maximum temperature of freshly mixed concrete is specified in ASTM C1064 T or F
false
ASTM C1064

what special procedures are required when taking the temperature of concrete containing large size coarse aggregate (over 3in.[75mm])
make sure temperature has stabilized up to 20 min
ASTM C1064

the sample of concrete used for temperature determination must be rodded 25 times T or F
false
ASTM C172

sampling by this method is required when tests are to be made to determine ___ with specification requirements
compliance
ASTM C172

this method covers sampling from four types of mixers, which are ___, ___, ___, and ___
stationary, paving, revolving, and open top
ASTM C172

the maximum allowable time between obtaining the first and final portions of a composite sample is ___ minutes
15
ASTM C172

portions of a composite sample shall be thoroughly remixed before beginning tests on the sample T or F
true
ASTM C172

the maximum elapsed time allowed between obtaining the final portion of the composite sample and beginning the tests for slump, temperature, and air content is ___ minutes
5
ASTM C172

the molding of strength test specimens shall begin with ___ minutes after fabricating the composite sample
15
ASTM C172

the concrete sample must be protected from contamination and ___
rapid evaporation, wind, and rain
ASTM C172

the minimum sample size for making strength test specimens is ___
28L (1cuft)
ASTM C172

when sampling from a stationary mixer, the batch must be sampled at ___ or more regularly spaced intervals during discharge of the middle portion of the batch
2
ASTM C172

the composite sample for a paving mixer must represent a minimum of ___ different portions of the batch of concrete taken from the pile after discharge
5
ASTM C172

when sampling from a revolving drum truck mixer, concrete must be sampled at a minimum of ___ regularly spaced intervals during discharge of the middle portion of the batch
2
ASTM C172

concrete samples from a truck mixer must be obtained before any water is added to the mixer at the job site T or F
false
ASTM C172

the composite sample from a truck mixer must be obtained from the ___ portion of the batch
middle
ASTM C172

when the concrete contains aggregate larger than that permitted for a particular test method, the sample of concrete must be ___ ___ before making the test
wet sieved
ASTM C143

the slump test is applicable to plastic concrete with a maximum size aggregate of ___
1/2"
ASTM C143

when the concrete contains aggregate larger than allowed for the slump test, the large aggregate must be ___
wet sieved
ASTM C143

the mold for making the slump test is in the shape of a ___
frustum of a cone
ASTM C143

the height of the slump mold is ___
12"
ASTM C143

the interior surface of the slump mold is allowed to have minor irregularities T or F
false
ASTM C143

for use in the slump test, the end or both ends of the tamping rod must be __
round hemispherical
ASTM C143

the sample of concrete for use in making the slump test must be obtained in accordance with ASTM Standard ___
C172
ASTM C143

the slump mold should be in a dry condition before beginning the test T or F
False
ASTM C143

the surface on which the slump mold will be placed must be ___
flat, rigid, non absorbent, and moist
ASTM C143

the slump mold is filled in ___ layers
3
ASTM C143

each layer should fill approximately ___ the volume of the mold
1/3
ASTM C143

the approximate concrete depth (in vertical distance) after placing the first layer is ___, and the second layer is ___
2 5/8", 6 1/8"
ASTM C143

what is the specified number of roddings for each layer
25
ASTM C143

how deep should the tamping rod penetrate into each layer
just slightly penetrate no more than 1"
ASTM

when rodding the bottom layer, the tamping rod must be ___ to uniformly distribute the strokes
slightly inclined, tilted
ASTM C143

what must be done if the concrete drops below the top of the slump mold while the top layer is being rodded
add more concrete, continue with rod count
ASTM C143

prior to lifting the mold, concrete must be removed from ___
base and top and sides and around the mold
ASTM C143

the approximate concrete depth (in vertical distance) after placing the first layer is ___, and the second layer is ___.
2 5/8 [70mm], 6 1/8 [160mm]
ASTM C143

what is the specified number of roddings for each layer?
25
ASTM C143

how deep should the tamping rod penetrate into each layer
rod each layer throughout its depth; on the second and final layers, the rod should just penetrate into the previous layer
ASTM C143

when rodding the bottom layer, the tamping rod must be ___ to uniformly distribute the strokes
slightly inclined/ tilted
ASTM C143

What must be done if the concrete drops below the top of the slump mold while the top layer is being rodded
add aditional concrete to keep an excess of concrete above the top of the mold at all times
ASTM C143

prior to lifting the mold, concrete must be removed from ___
the area surronding the base of the mold
ASTM C143

after the final rodding, the sides of the slump mold, it should not be rotated or twisted. T or F
false
ASTM C143

when raising the slump mold, it should not be rotated or twisted. T or F
true
ASTM C143

how much time is allowed for lifting the slump mold?
5 seconds +- 2seconds
ASTM C143

the measurement for slump is made from the top of the mold to what point of the concrete speciment?
the displaced origin center of the top surface of the specimen
ASTM C143

the slump of the concrete is measured and reported to the nearest ___
1/4" [5mm]
ASTM C143

how much time is allowed to conduct the slump test from beginning to completion?
2-1/2 min
ASTM C138

the diameter of the tamping rod used in this test method is ___
5/8"
ASTM C138

what is the required shape of the tamping end of the rod?
rounded to hemispherical tip
ASTM C138

what is the required minimum frequency of the vibrator used in this test method
7000 vibrations per min
ASTM C138

the outside diameter or side dimension of the vibratring element must be at least ___ but not greater than ___
0.75in, 1.50in
ASTM C138

a plastic container can be used for the measure in this method. T or F
false
ASTM C138

what is the minimum thickness of a metal strike-off plate
1/4"
ASTM C138

what is the specified weight of the mallet used on measures that are 0.5ft^3 [14L] or smaller
1.25 +-/.5 LBS
ASTM C138

measures other than air meter bowls used for this test must conform to ASTM ___
C29 Test method for bulk density (Unit Weight)
ASTM C138

air meter bowls used for this test must conform to ASTM ___ and be calibrated for volume according to ASTM ___
C231, C29
ASTM C138

the concrete sample must be obtained in accordance with what astm method?
C172
ASTM C138

what method of consolidation must be used when the slump is greater than 3in
rodding
ASTM C138

what method of consolidation must be used when the slump is less than 1in
vibration
ASTM C138

if rodding is the method of consolidation being used, the measure must be filled in how many layers
3
ASTM C138

for a measure of 0.5ft^3 [14L] what is the required number of strokes of the tamping rod for consolidation of each layer
25
ASTM C138

in rodding the middle and top layers, the tamping rod should penetrate into the previous layer about ___
1"
ASTM C138

if vibration is the method of consolidation, the measure must be filled in ___ approximately equal layers
2
ASTM C138

if, after consolidation of the final layer, the concrete level is 1/2in. above the top of the measure, what should be done?
remove with trowel or scoop
ASTM C138

after consolidation of the final layer, an excess of concrete ___ above the top of the measure is considered optimum
1/8"
ASTM C138

after completing the strike-off procedure, what must be done before weighing the measure and sample?
clean edges and excess concrete
ASTM C138
Density (Unit Weight Calculation)
Known: V of measure= 0.504ft^3
Mass of empty measure= 19.6lb
Procedures of method c138 are foled and mass of measure + conc. is found to be 92.1lb
Calculate density of concrete in lb/ft^3
mass of measure +sample 92.1lb
mass of empty measure -19.6lb
net mass of conc 72.5lb
d= 72.5lb/0.504ft^3 = 143.85lb/ft^3
ASTM C138
Yield Calcs
for design batch of 7yd^3, the tot mass of all materials batched was 27300lb. Using Density of 143.85lb/ft^3 calc:
Yield per batch ft^3, yd^3,
Yf=M/D = 27300/14.85= 189.73ft^3,
Y(yd^3)=Yf/27=7.03yd^3
Y(ft^3/yd^3)= 189.73/7.03=27.11
ASTM C138
Relative Yield Calc
given Yield per batch ft^3=189.73, calc relative yield for the batch
Ry=189.73/189=1.004
ASTM C138
Air Content Calc
air meter damaged on job, you possess theoretical density (air free unit weight) in lab=151.4lb/ft^3 Using density=143.85lb/ft^3 calc air content of batch
[(151.4-143.85)/151.4]X100= 5%
ASTM C231

the pressure method of determining air content can be used on concrete containing ___ ___ agregate
relatively dense
ASTM C231

the pressure method of determining air content cannot be used on concrete containing the following types of aggregate: ___, ___, ___
lightweight, air cooled slab, high porosity
ASTM C231

what is the minimum allowable capacity of the measuring bowl used in this test method?
0.20 ft^3
ASTM C231

what are the requried characteristics of the tamping rod used in the test method?
at least 16" long 5/8 dia rounder
ASTM C231

what is the specified size of the mallet required for this test method when the measuring bowl has a capacity of 0.5 ft^3 (14L) or less?
1.25 +- 0.5lbs
ASTM C231

the sample of concrete used for this test is to be obtained in accordance with what ASTM Standard? `
C172
ASTM C231

the maximum size aggregate allowed for this test method is
2"
ASTM C231

if the concrete contains aggregate larger than the maximum allowed for this test, the sample must be ___
wet sieved, 1 1/2" sieve
ASTM C231

if the concrete sample is to be consolidated by rodding, the measure is filled in ___ layers
3
ASTM C231

if the concrete sample is to be consolidated by vibration, the measure is filled in ___ layers
2
ASTM C231

when rodding the concrete sample, what is the specified number of strokes required for each layer?
25
ASTM C231

vibration of the concrete sample is not allowed when the slump of the concrete exceeds
3"
ASTM C231

in rodding the sample, how deep should the rod penetrate each layer
depth 1"
ASTM C231

after rodding each layer, what should be done to measure before adding another layer of concrete?
strike with mallet 10-15 times
ASTM C231

when consolidating the concrete by vibration, how many times should the vibrator be inserted into each layer?
3
ASTM C231

what tools may be used to strike off the top surface of the concrete following consolidation of the final layer?
strike off plate or bar or acrylic plate, metal or glass
ASTM C231

what must be done if there is a slight deficiency in the quantity of conc in the measure following consolidation of the final layer
add representative quantity of conc and strike off
ASTM C231

what must be done if there is an excessive amount of concrete in the measure following the consolidation of the final layer?
remove representative quantity with scoop or trowel and strike off
ASTM C173

the volumetric method of determining air content of concrete can be used on concrete containing what types of aggregate
all types
ASTM C173

what are the requirements for the tamping rod used in this test method
at least 12" long 5/8 thick with hemispheric ends. steel polyethylene or plastic
ASTM C173

what are requirements for strike off bar used in this test method
flat straight steel bar at least 1/8 X 3/4 X 12"
ASTM C173

what is approximate volume of the measuring cup used to add water to the air meter, in relation to the volume of the air meter bowl
1.0% +- 0.04%
ASTM C173

What type of alchohol and concentration must be used in this test method
70% by vol isopropyl
ASTM C173

a mallet weighing ___ must be used to tap the sides of the bowl after rodding each layer.
1.25lbs
ASTM C173

the sample of concrete used in this test method must be obtained in accordance with what ASTM Standard?
C172
ASTM C173

the max size aggregate allowed in this test method ___
1 1/2"
ASTM C173

if the concrete sample contains aggregate larger than that allowed for this test, the sample must be ___
wet sieved. 1" sieve
ASTM C173

when filling the bowl of the air meter, the concrete must be placed in ___ layers of equal depth
2
ASTM C173

what is the specified number of strokes required when rodding each layer of concrete?
25
ASTM C173

it is necessary to tap the sides of the bowl after each layer has been rodded. T or F
T
ASTM C173

the initial quantity of water and and alchohol added to the air meter can be poured directly into the neck of the top section of the air meter. T or F.
F, funnel must be used
ASTM C173

upon final filing of the air meter with water, what part of the liquid level should be adjusted to the zero mark on the meter?
bottom of miniscus
ASTM C173

how long should the air meter be inverted and agitated?
no more than five seconds at a time, but must be repeated for a minimum of 45 sec to free concrete from the base
ASTM C173

how many times does the rolling operation occur
min 2, max 3
ASTM C173

why is the isopropyl alcohol added to the meter?
dissapate the foam
ASTM C173

the direct reading of the final liquid level in the neck of the air meter, is estimated to the nearest ___.
0.25%
ASTM C173

if the air content is greater than the 9% range of the meter, ___
calibrated cups of water are added to bring the liquid level within the graduated range
ASTM C173

in order for an initial meter reading to be valid, the meter must not be leaking, the liquid level must stabilized with 6 min., and the foam on the surface of the liquid must be less than 2 full percent division. T or F
T
ASTM C173

if less than 2.5pints of alcohol are used, the air content is always indicated by the final meter reading. T or F
F
ASTM C173

if more than 2.5 pints of alcohol are used, the final meter reading is always adjusted using ___.
correction factor
ASTM C173

when large amounts of alcohol are used, the direct reading will tend to indicate a ___ air content.
higher
ASTM C173

at the end of the procedure, the air meter is ___
dissasembled Dump and contents inspected
ASTM C173

if portions of undisturbed concrete are found in the air meter at the end of the test, ___
the test is invalid
ASTM C31

astm c31 gives standardized requirements for ___, ___, ___, and ___, of test specimens
making, curing , protecting, transporting
ASTM C31

for cylinders with a diameter of 6in. or greater, the tamping rod must be a round, straight steel rod with a diameter of ___
5/8" +- 1/16in