Astm C31/c31M Making And Curing Concrete Test Specimens In The Field

Front 1

ASTM Method C31 gives standardized requirements for ______, _____, _____, and _____, of test specimens

Back 1

making, curing, protecting, transporting

Front 2

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 ______.

Back 2

5/8''

Front 3

The minimum frequency of an interval vibrator used in this procedure is

Back 3

9000

Front 4

The container for obtaining the concrete sample used in this procedure can be a _____, _____, or _____.

Back 4

Metal pan, wheel barrow, flat clean mixing board

Front 5

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

Back 5

1 1/2''

Front 6

The sample of concrete used in molding test specimens must be obtained in accordance with what ASTM Standard?

Back 6

ASTM C-172

Front 7

When strength specimens are to be made, what three other tests must be made?

Back 7

Air, Temperature, and Slump

Front 8

After molding the test specimens you should wait two hours before moving them to the location of initial storage. T or F

Back 8

False

Front 9

The supporting surface on which specimens are stored shall be level within

Back 9

1/4'' per FT

Front 10

For concrete with a slump less than 1 inch the test specimens must be consolidated by

Back 10

vibration

Front 11

If the concrete is to be consolidated by vibration, a standard 4 by 8 in cylinder must be filled in ____ equal layers

Back 11

2

Front 12

When rodding a standard 6 by 12 in cylinder each layer must be rodded

Back 12

25 times

Front 13

When rodding each upper layer of concrete in a cylinder, the tamping rod should penetrate into underlying layer by about ___

Back 13

1''

Front 14

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

Back 14

2

Front 15

When consolidating a flexural strength test specimen by rodding, rod one stroke for each _____ of top surface area

Back 15

25L

Front 16

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

Back 16

6''

Front 17

Concrete mixtures with a specified strengths of 6000 PSI [40MPa] or greater shall have an initial curing temperature between

Back 17

68-78 degrees

Front 18

Up to 48 hours after molding, test specimens that are to be standard cured shall be stored in a temperature between a range of

Back 18

60 and 80 degrees

Front 19

Upon completion of the initial curing, the test specimens may be left in their molds and sealed in plastic bags T or F

Back 19

False

Front 20

During transportation, test specimens must be protected from damage due to ____, _____, and ____

Back 20

Jarring, Freezing, Moisture Loss

Front 21

Specimens shall not be transported until ______ after final set

Back 21

8 hours

Front 22

Standard curing is the curing method used when test specimens are to be used for

Back 22

strength, mixture proportions, and quality control

Front 23

Field curing is the curing method used when test specimens are to be used for

Back 23

determining form removal, determining if structure can be placed in service comparison to standard curing, adequacy of curing and protection of structure

Front 24

Cylinders that are to be field cured are stored _____ and protected __________

Back 24

on or near the structure and in the same manner as the sturcture

Front 25

The temperature and moisture environment for field cured cylinders must be _______

Back 25

the same as the structure they represent

Front 26

Cylindres made for the purpose of determining when a structure may be pout into service shall be removed from the molds

Back 26

at the time of form work removal

Front 27

Transportation time shall not exceed

Back 27

4 hours