What is a typical acceptable concrete slump value?

Very dry mixes having slump 0 – 25 mm are typically used in constructing pavements or roads, low workability mixes having slump 10 – 40 mm are typically used for foundations with light reinforcement, medium workability mixes with slump 50 – 90 mm, are typically used for normal reinforced concrete placed with vibration.

What does a concrete slump test measure?

A concrete slump test measures the consistency of a concrete batch to see how easily the concrete will flow.

What is slump test value for m25 concrete?

Adopted maximum water-cement ratio = 0.47. From Table 2 of IS 10262:2009, maximum water content for 20 mm aggregate = 186 litre (for 25 to 50 mm slump range) Estimated water content for 100 mm slump = 186+ (6/186) = 197 litre. (Note: If Super plasticizer is used, the water content can be reduced upto 20\% and above.)

How is concrete slump calculated?

The slump value of concrete can be easily measured by using the slump cone test method. In which fresh concrete is poured and filled till the top. Then the cone is lifted slowly, the difference between the top of the cone and top concrete fall is measure as a slump of concrete.

What is a positive slump test?

Results. Positive sign is any kind of sciatic pain (radiating, sharp, shooting pain) or reproduction of other neurological symptoms. This indicates impingement of the sciatic nerve, dural lining, spinal cord, or nerve roots.

What does a high slump test indicate?

The higher the slump, the more workable the concrete. If the slump of concrete is too low, it won’t shape very easily. If it is too high, you run the risk of having the gravel, sand and cement settle out of the mixture, making it unusable.

What is the value of M20?

M20 concrete mix ratio:- M20 concrete mix ratio is 1:1.5:3, made of mixture of cement, sand and aggregate in which one part is cement, 1.5 part is sand and 3 part is aggregate or stone.

How do you read a slump test?

In technical terms, slump is a measured indication of the workability, or flow, of a mix. The drier the mix, the lower or “tighter” the slump. Conversely, the wetter or “looser” the mix, the higher the slump.

How to calculate slump in concrete?

Measure from the top of the cone to the base. Pull the slump cone up off of the concrete and measure how far the the wet concrete sinks, or slumps, down, by measuring to the top of the pile to the ground. Subtract this measurement from the original height of the slump cone. The distance slumped down is called the slump level.

What does a slump test tell you?

A slump test is a method used to determine the consistency of concrete. The consistency, sometimes described in terms of stiffness, generally indicates how much water has been used in the mix.

What are the disadvantages of slump test?

It is unreliable for lean mixes.

What does a positive slump test mean?

A positive slump test is when you feel the same pain going down your leg or if the back pain is made worse. A negative slump test is when you feel no low back pain or pain going into in the leg, just normal muscle tightness. The way it works is that the leaning forward position when seated,…