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27 Cards in this Set
- Front
- Back
ASTM Method C31 gives standardized requirements for ______, _____, _____, and _____, of test specimens |
making, curing, protecting, transporting |
|
For cylinders with a diameter of 6 inches [150mm] or greater, the tamping rod must be a round, straight steel rod with a diameter of ______. |
5/8'' |
|
The minimum frequency of an interval vibrator used in this procedure is |
9000 |
|
The container for obtaining the concrete sample used in this procedure can be a _____, _____, or _____. |
Metal pan, wheel barrow, flat clean mixing board |
|
A 6 by 12 in. [150mm by 300mm] cylinder mold can be used for concrete containing aggregate with particles not exceeding _____ in size, without the need for wet sieving the concrete |
1 1/2'' |
|
The sample of concrete used in molding test specimens must be obtained in accordance with what ASTM Standard? |
ASTM C-172 |
|
When strength specimens are to be made, what three other tests must be made? |
Air, Temperature, and Slump |
|
After molding the test specimens you should wait two hours before moving them to the location of initial storage. T or F |
False |
|
The supporting surface on which specimens are stored shall be level within |
1/4'' per FT |
|
For concrete with a slump less than 1 inch the test specimens must be consolidated by |
vibration |
|
If the concrete is to be consolidated by vibration, a standard 4 by 8 in cylinder must be filled in ____ equal layers |
2 |
|
When rodding a standard 6 by 12 in cylinder each layer must be rodded |
25 times |
|
When rodding each upper layer of concrete in a cylinder, the tamping rod should penetrate into underlying layer by about ___ |
1'' |
|
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 consolidating a flexural strength test specimen by rodding, rod one stroke for each _____ of top surface area |
25L |
|
When internal vibration is used to consolidate a standard flexural strength test specimen, the techninican should insert the vibrator at intervals not exceeding _____ along the center line of the beam |
6'' |
|
Concrete mixtures with a specified strengths of 6000 PSI [40MPa] or greater shall have an initial curing temperature between |
68-78 degrees |
|
Up to 48 hours after molding, test specimens that are to be standard cured shall be stored in a temperature between a range of |
60 and 80 degrees |
|
Upon completion of the initial curing, the test specimens may be left in their molds and sealed in plastic bags T or F |
False |
|
During transportation, test specimens must be protected from damage due to ____, _____, and ____ |
Jarring, Freezing, Moisture Loss |
|
Specimens shall not be transported until ______ after final set |
8 hours |
|
Standard curing is the curing method used when test specimens are to be used for |
strength, mixture proportions, and quality control |
|
Field curing is the curing method used when test specimens are to be used for |
determining form removal, determining if structure can be placed in service comparison to standard curing, adequacy of curing and protection of structure |
|
Cylinders that are to be field cured are stored _____ and protected __________ |
on or near the structure and in the same manner as the sturcture |
|
The temperature and moisture environment for field cured cylinders must be _______ |
the same as the structure they represent |
|
Cylindres made for the purpose of determining when a structure may be pout into service shall be removed from the molds |
at the time of form work removal |
|
Transportation time shall not exceed |
4 hours |