STUDY QUESTIONS Flashcards by Alex S

_5 minutes

What is the maximum allowable time BETWEEN THE FIRST AND FINAL PORTION OF THE COMPOSITE SAMPLE?

15 MINUTES

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Begin test for SLUMP AND AIR within _ minutes after obtaining the final portion of the composite sample?

5 MINUTES

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_5 minutes

Begin CASTING STRENGTH SPECIMENS WITHIN _ minutes after obtaining the final portion of a composite sample?

15 MINUTES

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REVOLVING DRUM TRUCK MIXTURES are sampled at (1)_+ locations in the (2)_ portion of the batch?

(1) 2+ LOCATIONS
(2) MIDDLE PORTION

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1) _0%

CONTINUOUS FEED MIXTURES – shall not be sampled until:

1) _% of the material has been discharged
2) All adjustments have been made

50%

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_-5 Minutes

After sampling from a CONTINUOUS MIXER – wait for _-_ minutes BEFORE the beginning test.

2-5 MINUTES

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PAVEMENT MIXERS are sampled after _ concrete has been discharged.

ALL concrete has been discharged

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PAVEMENT MIXTURES will be sampled around _ locations of the concrete mass?

5 LOCATIONS

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If the concrete contains aggregate TOO LARGE for the test equipment - you must __ prior to testing?

WET SIEVE

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_ft^3

What is the MINIMUM SAMPLE SIZE for casting STRENGTH SPECIMENS?

1 ft³

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Temperature sensing devices SHALL BE ACCURATE TOO: +- _ F.

+- 1 F

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30 - 1__ F

Temperature sensing devices shall be readable to the range of _-_ F.

30-120 F

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_2 Months

Dial and Digital thermometers MUST BE CALIBRATED AT LEAST every __ MONTHS?

12 Months

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Reference thermometer calibrations must BE TRACEABLE to the _ _ _ _.

NIST

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0._F

REFERENCE THERMOMETERS must be accurate to the +- _F

+- 0.5 F

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_ around the thermometer.

After thermometer immersion in concrete, you must _ to prevent the effect from ambient air from entering the thermometer.

COMPACT the concrete around the thermometer.

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Temperature sensing device must be left in a sample at least (1)_ but no more than (2)_ minutes.

(1) 2 MINUTES
(2) 5 MINUTES

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Temp of concrete is recorded TO THE NEAREST __?

DEGREE

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Use __ INSTEAD OF WATER to calibrate thermometers.

OIL

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(2) _0 degrees apart

Thermometers must be calibrated at least (1) _ temperatures – (2)__ degrees apart.

(1) 2
(2) 30

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The slump mold is in THE SHAPE OF A __.

FRUSTRUM

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1/__ inches

The dimensions of the slump mold MUST BE MAINTAINED within __ inches.

1/8 inches

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The slump cone is filled in (1)_ layers by (2)__.

(1) 3 Layers
(2) Volume

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1 1/_ inches

MAXIMUM NOMINAL AGGREGATE SIZE allowed for SLUMP test is __ inches.

1 1/2 inches

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# (2) 1 1/\_ inch sieve If concrete contains aggregate larger than allowed you must (1)\_\_ over a (2) __ sieve.

(1) Wet Sieve (2) 1 1/2 Sieve

# \_2 inches Slump mold is raised to the height of __ inches **AT THE END of the test**.

12 INCHES

Slump cone must be raised in time frames of (1)\_ seconds +- (2)\_ seconds.

(1) 5 Seconds (2) +- 2 Seconds

# 1/\_ inches Measure and record slump measurement to the nearest __ inch.

1/4 inches

# Me\_\_ OR St\_\_ Measures (buckets) must be made of __ **OR** \_\_.

1) METAL 2) STEEL

# 1/4 inches OR 1/2 inches? **The thickness of Metal, Glass, and Plastic** strike-off plates?

Metal - 1/4 inch Glass AND Plastic - 1/2 inch

# 1/\_ inches of concrete After the consolidation of the final lift of concrete in the air pressure meter test -- there should be __ inches of concrete above the rim of the measure.

1/8 inches of concrete

**Consolidation** at slumps: (1) Greater than 3 inches (2) Between 1-3 inches (3) Less than 1 inch

(1) RODDING (2) VIBRATION OR RODDING (3) VIBRATION

# Rod each layer \_5 times. Rodding Methods w/ MEASURE SIZE at: **1/2 ft^{3 (14L)}**

Rod each layer 25 TIMES

# Rod each layer \_0 times. Rodding Methods w/ MEASURE SIZE at: ## Footnote **1 ft³ (28L)**

Rod each later -- 50 TIMES

Rodding Methods w/ MEASURE SIZE LARGER THAN at: **1 ft³**

Rod each layer 1 time for each 3 in² of surface area.

Calculate DENSITY of the concrete given the following: Weight of Measure = 20.5 lbs Volume of Measure = 0.504 ft³ Weight of Measure full of concrete = 90.5 lbs

ANSWER: UW= 138.89 lbs/ft³

Calcualte the YIELD of the concrete given the following: 9 yd³ = Batch Weight = 34300 lbs Density = 140 lbs/ft³

y = 9.07 yd³

Calc Relative Yield given the following: 9 yd3 = Batch Weight = 34300 lbs Density = 140 lbs/ft3 y = 9.07 yd³ ^{(NEED ANSWER)}

1.008 yd³

The air meter must be calculated every _ months.

3 months

The **VOLUMETRIC** air meter must be filled in _ lifts.

**2** equal lifts by volume

# 1/\_ inches? A **METAL** strike-off bar must be at least __ inches thick.

1/8 inches thick

# 1/\_ inches A **PLASTIC** strike-off bar needs to be __ inches thick.

1/4 inches thick

What is the **FIRST LIQUID** that is poured into the air meter?

Water

# \_0% isopropyl alcohol What is the **% of isopropyl alcohol** that is added to the meter?

70% of isopropyl alcohol

# \_5 seconds at a time The **VOLUMETRIC** air meter is inverted and agitated for a **MINIMUM** of __ at a time.

45 seconds at a time

The **VOLUMETRIC** air meter cannot be inverted more than _ seconds.

5 seconds

The **rolling operation** for the volumetric air meter must occur as a whole a MINIMUM of _ times.

Minimum of 2 times

# (1) 1/\_% A stable reading is when the water level does not drop by more than **(1)** \_\_% in **(2)** __ minutes.

(1) 1/4% (2) 2 minutes

# (2) Add whole \_\_ If the initial reading is beyond the (1)\_% of the meter -- you must (2)\_\_.

(1) 9% (2) Added whole cups of calibrated water until the water level is within the site glass.

# (1) 1/\_% (2) Repeat __ procedure If second reading is greater than (1)\_\_% different from the initial reading, you must (2)\_\_

(1) 1/4% (2) Repeat the rolling operation a **third time**

There is allowed to be up to \_% of foam over the water level on the initial reading

2% foam

You have up to _ minutes for the initial reading to become stable.

Up to 6 minutes

If more than (1)\_ pints of alcohol is added -- an (2)\_\_ must be subtracted to the final calculation

(1) 2 Pints (2) Alcohol Correction Factor

# (2) \_5 times (3) \_/8 inch +- 1/\_ inch rod **4x8 cylinder molds** are filled in (1) __ lifts and rodded (2)\_\_ times per layer with a (3)\_\_ diameter rod.

(1) 2 lifts (2) 25 times (3) 3/8 inch +- 1/16 inch rod

# (2) \_5 times per layer (3) \_/8 inch +- 1/\_ inches **6x12 cylinder molds** are filled in (1) __ lifts and rodded (2)\_\_ times per layer with a (3)\_\_ diameter rod.

(1) 3 lifts (2) 25 times per layer (3) 5/8 inch +- 1/16 inch

# 60-\_ F Specimens to be standard **cured shoud be kept in a temperature** range of __ if the **strength is less than 6000 psi.**

60-80 F

# \_8 - \_8 F Specimens to be standard cured shoud be kept in a temperature range of __ if the strength is **greater than 6000 psi**.

68-78 F

Transportation time of cylinders to a maximum of _ hours.

Maximum of 4 HOURS

# \_0 minutes Once the molds are removed from the specimens -- they must be placed in final curing within __ minutes.

30 minutes

# (1) Temp\_\_ (2) Moi\_\_ (3) Str\_\_ Field cured specimiens shall be the same (1)\_\_ and the same (2)\_\_ and cured in the same manner as the (3)\_\_.

(1) Temperature (2) Moisture (3) Structure

Molds for the field cured specimens should be removed when the __ are removed from the strucure.

FORMS