Slump Of concrete Flashcards
The maximum nominal size of anchor get in the concrete sample that is appropriate when a slump test is to be performed is
40 mm
When the concrete contains larger than allowed for the slump test, what must be done to the concrete sample?
Perform the test on the fraction of concrete passing 40 mm sieve
The mould from making the slump test is in the shape of a
Frustum of a cone
The height of the slump cone is
300
The test for slump should be completed within blank minutes of obtaining the sample, including transporting and mixing
10
A piece of reinforcing steel makes a good tamping rod
False
The slump cone should be in a dry condition before beginning the test
False
The slump test from start of filling to the removal of the mould shall be completed without blank and within an elapsed time of blank
Interruption / two minutes
Twisting the slump cone slightly while raising the cone is permissible
False
The moon shall be lifted in blank by a steady upward lift
Approximately five seconds
Minimum sample size of 20 L is required for all slump tests
False
The mould shall be placed on a blank, blank, blank, blank surface, not subjected to blank
Flat / level / moist / non-absorbent / vibration
The slump cone is filled in blank layers
Three
Each layer should fill approximately blank the volume of the mould
1/3
1/3 and 2/3 of the volume of the mold, fills it to respective depths of blank and blank
70 / 160
If a slump cone requires nine scoops to be filled, each layer of equal volume will require blank scoop fulls
Three
How deeply must the tamping rod penetrate into previously placed layers?
25 mm
For stiff mixes vibrators are permitted for consolidation
False
On rodding the bottom layer, the tamping rod shall be blank in order to uniformly distribute the strokes
Inclined slightly
If the rodding operation results and subsidence of the concrete below the top edge of the mold, while riding the top layer, additional concrete may be added a upon completion of rodding
False
After the final rodding, the sides of the slump cone should be tapped lightly with the tamping rod
False
The slump is determined by measuring the difference between the height of what points
height of the mold / average of the top surface after subsidence
The slump of the concrete is measured and reported to the nearest blank
5 mm
What should the technician do if the slump specimen breaks or slumps laterally?
Repeat the test using an unused portion of remaining sample or new sample
