Slump Flow Of Concrete

Question 1

The maximum nominal size of aggregate in the concrete sample that is appropriate when a slump flow test is to be performed is blank

Answer 1

28

Question 2

The concrete contains aggregate larger than allowed, and the slump flow test must be performed. What must be done to the concrete sample

Answer 2

It must be wet sieved over a 28 mm sieve

Question 3

The requirements for the test specimen mould when performing the slump flow test are the same as blank with the exception of blank, which are not mandatory for this test method

Answer 3

Slump test / two foot pieces

Question 4

The minimum slump flow board dimensions are blank

Answer 4

800 mm squared

Question 5

The slump flow test must be completed within blank minutes of obtaining the sample, including transportation and remixing

Answer 5

10

Question 6

Piece of finished plywood makes a good slump flow board

Answer 6

False

Question 7

The slump flow cone should be in dry condition before beginning to test

Answer 7

False

Question 8

The maximum time permitted from the start of filling the cone with concrete to the lifting of the cone from the base is blank

Answer 8

3

Question 9

What is the time allowed for lifting the slump cone

Answer 9

3 +- 1 second

Question 10

To what height should the swamp flow cone be raised?

Answer 10

225 +- 75 mm

Question 11

A minimum sample size of 20 L is required for all slump flow tests

Answer 11

False

Question 12

When performing the slump flow test the surface shall be a _____ having a minimum thickness of ______ mm. The surface shall be in a _______ and ______ position, not subject to _______.

Answer 12

Rigid, non absorbent, smooth plastic surface / 12 / flat / level / vibrations

Question 13

The slump flow cone may be filled in the _______ or ________ position and must be filled in _______ layers when performing the slump flow test

Answer 13

Upright / inverted / one

Question 14

The slump flow cone must be filled in the blank position when the T50 time is performed

Answer 14

Upright

Question 15

Two concentric circles are to be marked the inner circle is to _______ the position of the mould and the outer circle is to have a diameter of ______

Answer 15

Centrally locate / 500 mm

Question 16

The recorded slump flow measurements do not include any halo that may be present

Answer 16

False

Question 17

T50 time test can be accurately conducted by one field technician

Answer 17

False

Question 18

Upon removal of the mold, allow the concrete to achieve ________ or until two minutes has lapsed

Answer 18

Maximum horizontal spread

Question 19

The measurement for diameter in the direction of the horizontal spread is determined in ______ directions

Answer 19

Two perpendicular

Question 20

The two measured diameters are ________ and reported to the nearest _______ mm

Answer 20

Averaged / 10

Question 21

Slump flow test must be repeated if ______

Answer 21

The measurement of the two diameters differs by more than 50 mm