Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
32 Cards in this Set
- Front
- Back
|
The volumetric method of determining air content of concrete can be used on concrete containing what types of aggregate |
All types of aggregate |
|
|
what are the requirements for the strike off bar used in the volumetric test method |
Flat straight steel (1/8 by 3/4 by 12) Plastic (1/4 by 3/4 by 12) |
|
|
what is the approximate volume of the measuring cup used to add water to the air meter, in relation to the volume of the air meter bowl |
1.00 +- 0.04% |
|
|
The maximum size aggregate allowed in the volumetric test is |
1.5 |
|
|
If the concrete sample contains agg larger than allowed for the volumetric test, what must be done |
wet sieved over 1 in |
|
|
when flling the measuring bowl of the air meter, the concrete must be placed in ________ layer of equal volume, volumetric method |
2 |
|
|
The direct reading of the final liquid level, in the neck of the air meter, is estimated to the nearest___ |
.25% |
|
|
If the air content is greater than the 9% range of the meter |
calibrated cups of water should be added until water is within the graduated range |
|
|
if less than 2.5 pints of alcohol are used, the air content is always indicated by the final meter reading, true or false |
False, if the air content is more than 9%, calibrated cups must be added |
|
|
If more than 2.5 pints of alcohol are used, the final meter reading is always adjusted using |
A correction factor |
|
|
The pressure method of determining air content can be used on concrete containing what kind of agg |
relatively dense |
|
|
The pressure method of determining air content cannot be used on concrete containing the following types of aggregate |
lightweight, air-cooled blast furnaced slag, high porosity aggregates |
|
|
What is the minimum allowable capacity of the measuring bowl used in the pressure method test?
|
0.20 ft3 |
|
|
The maximum size aggregate allowed for the pressure method is |
2in |
|
|
If the concrete contains aggregate larger than the maximum allowed for this test the sample must be |
wet sieved 1.5in |
|
|
When consolidating the concrete by vibration, how many times should the vibrator be inserted into each layer, pressure method |
3 |
|
|
Practice C31 gives standardized requirements for __________ _________ _________ ________ of test specimens |
making, curing, protecting, transporting |
|
|
the container for obtaining the concrete sample for cylinder specimens used in this procedure can be a |
metal pan, wheelbarrow, flat clean non absorbent mixing board |
|
|
A 6 by 12in cylinder mold can be used for concrete containing aggregate with particles not exceeding ____ in size |
2 in |
|
|
The supporting surface on which the specimens are stored shall be level within |
1/4 per foot |
|
|
When using an internal vibrator to consolidate a 6 by 12 in compressive strength test specimen, the vibrator must be inserted at _____ different points for each layer |
2 |
|
|
When internal vibration is used to consolidate a standard flexural specimen, the tech should not insert the vibrator at intervals not exceeding _____ along the center line of the beam |
6in |
|
|
Concrete mixtures with specified strengths of 6000psi or greater shall have an initial curing temp between |
68-78F |
|
|
Up to 48 hours after molding, test specimens that are to be standard cured shall be stored in temps between _____ and ______ |
60-80 |
|
|
During transportation, test specimens must be protected from damage due to |
Jarring, freezing, moisture loss |
|
|
specimens shall not be transported until ______ after final set |
8h |
|
|
transportation time shall not exceed _____ for specimens |
4h |
|
|
Standard curing is the curing method used when test specimens are to be used for_________ |
acceptance testing for specified strength, mixture proportions for strength, quality control |
|
|
Field curing is the curing method used when test specimens are to be used for |
determination whether the structure is capable of being put into service |
|
|
Cylinders that are to be field cured are stored _______ and protected ________ |
in or on the structure near the represented concrete, in as near as possible the same way as the formed work |
|
|
The temperature and moisture environment for field cured cylinders must be
|
The same as the structural work
|
|
|
Cylinders made for the purpose of determining when a structure may be put into service shall be removed from the molds _______ |
At the time of removal of formwork |
