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136 Cards in this Set
- Front
- Back
ACI
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American Concrete Institute
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PCA
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Portland Concrete Association
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ASTM C1064
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Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete
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ASTM C172
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Standard Practice for Sampling Freshly Mixed Concrete
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ASTM C143
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Standard Test Method for Slump of Hydraulic-Cement Concrete
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ASTM C138
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Standard Test Method for Density (Unit Weight), Yield and Air Content (Gravimetric) of Concrete
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ASTM C231
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Standard Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method
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ASTM C173
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Standard Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method
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ASTM C31
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Standard Practice for Making and Curing Concrete Test Specimens in the Field
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ASTM C1064
the sensor of the temperature measuring device shall have at least ___ in. ___ mm of concrete cover in all directions |
3in, 75mm
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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],
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ASTM C1064
the temperature measuring device shall be calibrated ___, or whenever there is a question of ___. |
annually, accuracy
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ASTM C1064
the temperature of concrete may be measured in a wheelbarrow |
true
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ASTM C1064
the temperature of concrete may be measured in a wall form |
true
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ASTM C1064
a composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temperature. |
false
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ASTM C1064
what must be done to the sample container prior to the sampling the concrete |
the sample container must be dampened and moistened
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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
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ASTM C1064
how long must the temperature measuring device remain in the freshly mixed concrete for an accurate reading |
2 min or until stabilized
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ASTM C1064
after the temperature of the concrete is read what is then required |
record the temperature
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ASTM C1064
complete the temperature measurement of freshly mixed concrete within ___ minutes after obtaining a sample |
5
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ASTM C1064
the temperature of the concrete is recorded to the nearest ___ degree F [___degree C] |
1, 0.5
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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.
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ASTM C1064
a maximum temperature of freshly mixed concrete is specified in ASTM C1064 T or F |
false
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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
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ASTM C1064
the sample of concrete used for temperature determination must be rodded 25 times T or F |
false
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ASTM C172
sampling by this method is required when tests are to be made to determine ___ with specification requirements |
compliance
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ASTM C172
this method covers sampling from four types of mixers, which are ___, ___, ___, and ___ |
stationary, paving, revolving, and open top
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ASTM C172
the maximum allowable time between obtaining the first and final portions of a composite sample is ___ minutes |
15
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ASTM C172
portions of a composite sample shall be thoroughly remixed before beginning tests on the sample T or F |
true
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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
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ASTM C172
the molding of strength test specimens shall begin with ___ minutes after fabricating the composite sample |
15
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ASTM C172
the concrete sample must be protected from contamination and ___ |
rapid evaporation, wind, and rain
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ASTM C172
the minimum sample size for making strength test specimens is ___ |
28L (1cuft)
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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
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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
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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
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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
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ASTM C172
the composite sample from a truck mixer must be obtained from the ___ portion of the batch |
middle
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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
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ASTM C143
the slump test is applicable to plastic concrete with a maximum size aggregate of ___ |
1/2"
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ASTM C143
when the concrete contains aggregate larger than allowed for the slump test, the large aggregate must be ___ |
wet sieved
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ASTM C143
the mold for making the slump test is in the shape of a ___ |
frustum of a cone
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ASTM C143
the height of the slump mold is ___ |
12"
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ASTM C143
the interior surface of the slump mold is allowed to have minor irregularities T or F |
false
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ASTM C143
for use in the slump test, the end or both ends of the tamping rod must be __ |
round hemispherical
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ASTM C143
the sample of concrete for use in making the slump test must be obtained in accordance with ASTM Standard ___ |
C172
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ASTM C143
the slump mold should be in a dry condition before beginning the test T or F |
False
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ASTM C143
the surface on which the slump mold will be placed must be ___ |
flat, rigid, non absorbent, and moist
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ASTM C143
the slump mold is filled in ___ layers |
3
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ASTM C143
each layer should fill approximately ___ the volume of the mold |
1/3
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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"
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ASTM C143
what is the specified number of roddings for each layer |
25
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ASTM C143
how deep should the tamping rod penetrate into each layer |
just slightly penetrate no more than 1"
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ASTM
when rodding the bottom layer, the tamping rod must be ___ to uniformly distribute the strokes |
slightly inclined, tilted
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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
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ASTM C143
prior to lifting the mold, concrete must be removed from ___ |
base and top and sides and around the mold
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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]
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ASTM C143
what is the specified number of roddings for each layer? |
25
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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
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ASTM C143
when rodding the bottom layer, the tamping rod must be ___ to uniformly distribute the strokes |
slightly inclined/ tilted
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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
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ASTM C143
prior to lifting the mold, concrete must be removed from ___ |
the area surronding the base of the mold
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ASTM C143
after the final rodding, the sides of the slump mold, it should not be rotated or twisted. T or F |
false
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ASTM C143
when raising the slump mold, it should not be rotated or twisted. T or F |
true
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ASTM C143
how much time is allowed for lifting the slump mold? |
5 seconds +- 2seconds
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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
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ASTM C143
the slump of the concrete is measured and reported to the nearest ___ |
1/4" [5mm]
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ASTM C143
how much time is allowed to conduct the slump test from beginning to completion? |
2-1/2 min
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ASTM C138
the diameter of the tamping rod used in this test method is ___ |
5/8"
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ASTM C138
what is the required shape of the tamping end of the rod? |
rounded to hemispherical tip
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ASTM C138
what is the required minimum frequency of the vibrator used in this test method |
7000 vibrations per min
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ASTM C138
the outside diameter or side dimension of the vibratring element must be at least ___ but not greater than ___ |
0.75in, 1.50in
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ASTM C138
a plastic container can be used for the measure in this method. T or F |
false
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ASTM C138
what is the minimum thickness of a metal strike-off plate |
1/4"
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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
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ASTM C138
measures other than air meter bowls used for this test must conform to ASTM ___ |
C29 Test method for bulk density (Unit Weight)
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ASTM C138
air meter bowls used for this test must conform to ASTM ___ and be calibrated for volume according to ASTM ___ |
C231, C29
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ASTM C138
the concrete sample must be obtained in accordance with what astm method? |
C172
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ASTM C138
what method of consolidation must be used when the slump is greater than 3in |
rodding
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ASTM C138
what method of consolidation must be used when the slump is less than 1in |
vibration
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ASTM C138
if rodding is the method of consolidation being used, the measure must be filled in how many layers |
3
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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
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ASTM C138
in rodding the middle and top layers, the tamping rod should penetrate into the previous layer about ___ |
1"
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ASTM C138
if vibration is the method of consolidation, the measure must be filled in ___ approximately equal layers |
2
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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
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ASTM C138
after consolidation of the final layer, an excess of concrete ___ above the top of the measure is considered optimum |
1/8"
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ASTM C138
after completing the strike-off procedure, what must be done before weighing the measure and sample? |
clean edges and excess concrete
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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 |
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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 |
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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
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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%
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ASTM C231
the pressure method of determining air content can be used on concrete containing ___ ___ agregate |
relatively dense
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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
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ASTM C231
what is the minimum allowable capacity of the measuring bowl used in this test method? |
0.20 ft^3
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ASTM C231
what are the requried characteristics of the tamping rod used in the test method? |
at least 16" long 5/8 dia rounder
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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
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ASTM C231
the sample of concrete used for this test is to be obtained in accordance with what ASTM Standard? ` |
C172
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ASTM C231
the maximum size aggregate allowed for this test method is |
2"
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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
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ASTM C231
if the concrete sample is to be consolidated by rodding, the measure is filled in ___ layers |
3
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ASTM C231
if the concrete sample is to be consolidated by vibration, the measure is filled in ___ layers |
2
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ASTM C231
when rodding the concrete sample, what is the specified number of strokes required for each layer? |
25
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ASTM C231
vibration of the concrete sample is not allowed when the slump of the concrete exceeds |
3"
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ASTM C231
in rodding the sample, how deep should the rod penetrate each layer |
depth 1"
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ASTM C231
after rodding each layer, what should be done to measure before adding another layer of concrete? |
strike with mallet 10-15 times
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ASTM C231
when consolidating the concrete by vibration, how many times should the vibrator be inserted into each layer? |
3
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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
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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
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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
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ASTM C173
the volumetric method of determining air content of concrete can be used on concrete containing what types of aggregate |
all types
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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
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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"
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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%
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ASTM C173
What type of alchohol and concentration must be used in this test method |
70% by vol isopropyl
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ASTM C173
a mallet weighing ___ must be used to tap the sides of the bowl after rodding each layer. |
1.25lbs
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ASTM C173
the sample of concrete used in this test method must be obtained in accordance with what ASTM Standard? |
C172
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ASTM C173
the max size aggregate allowed in this test method ___ |
1 1/2"
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ASTM C173
if the concrete sample contains aggregate larger than that allowed for this test, the sample must be ___ |
wet sieved. 1" sieve
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ASTM C173
when filling the bowl of the air meter, the concrete must be placed in ___ layers of equal depth |
2
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ASTM C173
what is the specified number of strokes required when rodding each layer of concrete? |
25
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ASTM C173
it is necessary to tap the sides of the bowl after each layer has been rodded. T or F |
T
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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
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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
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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
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ASTM C173
how many times does the rolling operation occur |
min 2, max 3
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ASTM C173
why is the isopropyl alcohol added to the meter? |
dissapate the foam
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ASTM C173
the direct reading of the final liquid level in the neck of the air meter, is estimated to the nearest ___. |
0.25%
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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
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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
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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
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ASTM C173
if more than 2.5 pints of alcohol are used, the final meter reading is always adjusted using ___. |
correction factor
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ASTM C173
when large amounts of alcohol are used, the direct reading will tend to indicate a ___ air content. |
higher
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ASTM C173
at the end of the procedure, the air meter is ___ |
dissasembled Dump and contents inspected
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ASTM C173
if portions of undisturbed concrete are found in the air meter at the end of the test, ___ |
the test is invalid
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ASTM C31
astm c31 gives standardized requirements for ___, ___, ___, and ___, of test specimens |
making, curing , protecting, transporting
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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
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