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Concrete Testing Procedures, Exams of Advanced Education

Kabarak UniversityAdvanced Education

Various testing procedures and requirements for concrete, including topics such as sampling, temperature measurement, slump testing, air content determination, and specimen preparation for strength testing. It provides detailed information on the correct methods, equipment, and specifications for conducting these tests according to industry standards. The document aims to ensure the proper evaluation and quality control of concrete used in construction projects. It covers a wide range of topics related to concrete testing, including the correct handling of samples, the use of specific equipment, the required number of test steps, and the acceptable ranges for various concrete properties. By studying this document, readers can gain a comprehensive understanding of the essential concrete testing procedures and requirements necessary for ensuring the quality and performance of concrete in construction applications.

Typology: Exams

2023/2024

Available from 08/21/2024

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ACI Exam Questions With 100% Correct
Answers | Verified | Updated 2023-2024
Collecting a representative sample of concrete to be tested is as important as executing
the test methods to obtain ___________ - Correct Answer-Accurate Results
This practice covers sampling from four types of equipment, which are ____________ ,
____________ , _____________ , and ______________. - Correct Answer-Paving
Mixers, Stationary mixer, revolving mixer, continuous mixer.
The elapsed time between obtaining the first and final portions of a composite sample
shall not exceed ____________ - Correct Answer-15 Mins
Portions of a composite sample shall be thoroughly remixed before beginning tests on
the sample. T or F - Correct Answer-T
Start test for slump, temperature, air content within __________ after obtaining the final
portion of the composite sample. - Correct Answer-5 mins
Start molding specimens for strength tests within __________ after fabricating the
composite sample. - Correct Answer-15 mins
The concrete sample must be protected from contamination and ___________. -
Correct Answer-Evaporation
The minimum size sample for making strength test specimens is _______. - Correct
Answer-1 ft^3
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. -
Correct Answer-2
When sampling from a paving mixer, obtain samples from at least _______ different
portions of the pile and combine them into one composite sample for test purposes. -
Correct Answer-5
When sampling from a revolving truck mixer, sample the concrete by collecting _______
or more portions take at regularly spaced intervals during discharge of the middle
portion of the batch. - Correct Answer-2
Concrete samples from a truck mixer must be obtained before any water or admixtures
are added to the mixer at the job site. T or F - Correct Answer-F
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Download Concrete Testing Procedures and more Exams Advanced Education in PDF only on Docsity!

ACI Exam Questions With 100% Correct

Answers | Verified | Updated 2023-

Collecting a representative sample of concrete to be tested is as important as executing the test methods to obtain ___________ - Correct Answer-Accurate Results This practice covers sampling from four types of equipment, which are ____________ , ____________ , _____________ , and ______________. - Correct Answer-Paving Mixers, Stationary mixer, revolving mixer, continuous mixer. The elapsed time between obtaining the first and final portions of a composite sample shall not exceed ____________ - Correct Answer-15 Mins Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample. T or F - Correct Answer-T Start test for slump, temperature, air content within __________ after obtaining the final portion of the composite sample. - Correct Answer-5 mins Start molding specimens for strength tests within __________ after fabricating the composite sample. - Correct Answer-15 mins The concrete sample must be protected from contamination and ___________. - Correct Answer-Evaporation The minimum size sample for making strength test specimens is _______. - Correct Answer-1 ft^ 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. - Correct Answer- When sampling from a paving mixer, obtain samples from at least _______ different portions of the pile and combine them into one composite sample for test purposes. - Correct Answer- When sampling from a revolving truck mixer, sample the concrete by collecting _______ or more portions take at regularly spaced intervals during discharge of the middle portion of the batch. - Correct Answer- Concrete samples from a truck mixer must be obtained before any water or admixtures are added to the mixer at the job site. T or F - Correct Answer-F

When the concrete contains aggregate larger than that permitted for a particular test method, the sample of concrete must be ________________ before making the test. - Correct Answer-Wet sieved The stem of the thermometer is submerged a minimum of __________ into the freshly mixed concrete. - Correct Answer-3 in The thermometer shall be capable of accurately measuring the temperature of freshly mixed concrete to ____________ throughout a range of _________ to ___________. - Correct Answer-(+-1 F ) , (30-120 F) The thermometer shall be verified within ________. - Correct Answer-1 year The temperature of concrete may be measured in a wheelbarrow. T or F - Correct Answer-T The temperature of concrete may be measured in a wall form. T or F - Correct Answer- T A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temperature. T or F - Correct Answer-F What must be done to the sample container prior to sampling the concrete? - Correct Answer-Dampen / Wet it What must be done to the concrete surrounding the thermometer after the device is submerged in the fresh concrete? - Correct Answer-compacted 3 in around stem no voids. How long must the thermometer remain in the freshly mixed concrete? - Correct Answer-2-5 min After the temperature of the concrete is read, what is then required? - Correct Answer- Record the temperature The temperature of the concrete is recorded to the nearest ________. - Correct Answer-1 F There is a specified maximum temperature of freshly mixed concrete. T or F - Correct Answer-F The sample of concrete used for temperature determination must be rodded 25 times? T or F - Correct Answer-F When the concrete contains aggregate larger than allowed for the slump test, the large aggregate must be _____. - Correct Answer-Wet Sieved (1-1.5 in sieve)

The measurement for slump is made from the top of mold to what point of the concrete specimen? - Correct Answer-Original displaced Center The Slump of the concrete is reported to the nearest _________. - Correct Answer-1/ inch How much time is allowed to conduct the slump test from beginning to completion? - Correct Answer-2.5 mins The length of the tamping rod used in this test method is ________________. - Correct Answer-4 inches longer then container or no more then 24 inches long. What is the required shape of the tamping end of the rod? - Correct Answer- Hemispherical What is the required minimum frequency of the vibrator used in this test method? - Correct Answer-9000 vibrations per minute The outside diameter or side dimension of the vibrating element must be at least ________ but not greater then _________. - Correct Answer-3/4 in , 1.5 in What material is the measure made of? - Correct Answer-Metal What is the minimum thickness of a metal strike off plate? - Correct Answer-1/4 in What is the minimum thickness of a glass or acrylic strike off plate? - Correct Answer- 1/2 in What is the specified weight of the mallet used on measures that are 1/2 ft^3 or smaller? - Correct Answer-1.25 lb +- .5 lb What method of consolidation must be used when the slump is greater then 3 in? - Correct Answer-Rodding What method of consolidation must be used when the slump is less than 1 in. (25 mm]?

  • Correct Answer-Vibration If rodding is the method of consolidation being used, the measure must be filled in how many layers? - Correct Answer- For a measure of 0.5 ft^3 [14 L], what is the required number of strokes of the tamping rod for consolidation of each layer? - Correct Answer- When rodding the middle and the top layers, the tamping rod should penetrate into the layer below approximately _____. - Correct Answer-1 in

If vibration is the method of consolidation, the measure must be filled in _____ approximately equal layers. - Correct Answer- If, after consolidation of the final layer, the concrete level is 1/2 in. (13 mm) above the top of the measure, what should be done? - Correct Answer-Remove excess till only 1/ in remains After completing the strike off procedure, what must be done before weighing the measure and sample? - Correct Answer-Remove excess from measure The pressure method of determining air content can be used on concrete containing __________ and ____________ aggregate. - Correct Answer-Normal Weight, Heavy Weight The pressure method of determining air content cannot be used on concrete containing the following: ___________ or ___________. - Correct Answer-lightweight aggregates, aggregates of high porosity What is the specified size of the mallet required for a typical air meter? - Correct Answer-1.25 lb +- 0.5 lb Wet screening may be necessary when the mix contains aggregate with a nominal maximum size greater then ________. - Correct Answer-1.5 in If the concrete sample is to be consolidated by rodding, the measure is filled in _____ layers. - Correct Answer- If the concrete sample is to be consolidated by vibration, the measure is filled in _____ layers. - Correct Answer- When rodding the concrete sample, what is the specified number of strokes required for each layer? - Correct Answer- Vibration of the concrete sample is not allowed when the slump of concrete exceeds _____. - Correct Answer- In rodding the sample how deep should the rod penetrate each layer? - Correct Answer- Completely through and at least 1 in into previous layer. After rodding each layer, what should be done to the measure before adding another layer of concrete? - Correct Answer-Tap with mallet 10-15 times evenly distributed around the measure. What tools may be used to strike off the top surface of the concrete following consolidation of the final layer? - Correct Answer-Strike off Plate or Bar

The direct reading of the final liquid level, in the neck of the air meter, is estimated to the nearest ________. - Correct Answer-.25% The air content is greater than the 9% range of the meter, ___________________________________________. - Correct Answer-Add enough cups to hit in the 6-7 range. In order for an initial meter reading to be valid, the meter must not be leaking, the liquid level must be stabilize within 6 min, and the foam on the surface of the liquid must not be greater than 2 full percent divisions. T or F - Correct Answer-T If less than 1.25 L [2.5 pt] of alcohol are used, the air content is always indicated by the final meter reading. True or False? - Correct Answer-Correction Factor At the end of the procedure, the air meter is _________________________________________________. - Correct Answer- Dismantle and check for full agitation If portions of undistributed concrete are found in the air meter at the end of the test, ___________________________________________. - Correct Answer-You fail the test For cylinders with a diameter of 6 in. [150 mm] or greater, the tamping rod must be a round, straight steel rod with a diameter of _____. - Correct Answer-5/8 " The minimum frequency of an internal vibrator used in this procedure is _________. - Correct Answer-9000 VPM Concrete containing aggregate with particles not exceeding ______ can be used to cast specimens without the need for wet screening. - Correct Answer-2" For concrete with a slump of less than 1 in. [25 mm], the test specimens must be consolidated by _____. - Correct Answer-Vibration If the concrete is to be consolidated by vibration, a standard 4 by 8 in. [100 mm by 200 mm] cylinder mold must be filled in _____ equal layers. - Correct Answer- When rodding each upper layer of concrete in a cylinder, the tamping rod should penetrate into the underlying layer by about _____. - Correct Answer-1" When rodding a standard 6 by 12 in [150 mm by 300 mm] cylinder, each layer must be rodded _____ times. - Correct Answer- When using an internal vibrator to consolidate a 6 by 12 in. [150 mm by 300 mm] compressive strength test specimen, the vibrator must be inserted at _____ different points for each layer. - Correct Answer-

When consolidating a flexural strength test specimen by rodding, rod one stroke for each _____ of top surface area. - Correct Answer-2 in^ When internal vibration is used to consolidate a standard flexural strength test specimen, the technician should insert the bibrator at intervals not exceeding _____ along the center line of the beam. - Correct Answer-6 " Concrete mixtures with specified strengths of 6000 psi [40 MPa] or greater shall have an initial curing temperature between __________. - Correct Answer-68 -- 78 (degrees Fahrenheit) Upon completion of initial curing, the test specimens may be left in their molds and sealed in plastic bags. T or F - Correct Answer-F During transportation, test specimens must be protected from damage due to __________, ____________, and ____________. - Correct Answer-Jarring, Moisture loss, Extreme temps Specimens shall not be transported until _____ after final set. - Correct Answer-8 hrs Transportation time shall not exceed ______. - Correct Answer-4 hrs Keep field cured specimens under ________________ conditions as the concrete placed for the structure. - Correct Answer-Identical