Slump check does not measure strength. It measures workability. Workability is the ease with which concrete can be placed in position.
Correct as far as it goes! Slump refers to workability however it is also, all telling as to the water content of the mix. The more water, the easier it will work! Problem becomes, too much water will increase the porosity making the concrete weak and susceptible to early degradation because contaminates are able to enter and commence corrosion of embedded steel.
A concrete that is easy to work that has a high water content [ more than .40 ] is known for shrinkage cracking due to rapid evaporation of the high water content. These cracks caused by rapid loss of water decrease compressive strength and invite early corrosion. This type of concrete also experiences, curling and ASR as well as efflorescence in a very short time period.
Strength is a function of correct hydration, slow internal curing and careful design of a mix for the intended service criteria and not a whole lot to do with slump!
The slump test is the most widely used device worldwide. In fact, the test is so well known that often the terms workability and slump are used interchangeably, even though they have different meanings. • Specifications are typically written in terms of slump. • The slump test is simple, rugged, and inexpensive to perform. Results are obtained immediately. • The results of the slump test can be converted to yield stress in fundamental units based on various analytical treatments and experimental studies of the slump test. • Compared to other commonly used concrete tests, such as for air content and compressive strength, the slump test provides acceptable precision.
The slump test is the most widely used device worldwide. In fact, the test is so well known that often the terms workability and slump are used interchangeably, even though they have different meanings. • Specifications are typically written in terms of slump. • The slump test is simple, rugged, and inexpensive to perform. Results are obtained immediately. • The results of the slump test can be converted to yield stress in fundamental units based on various analytical treatments and experimental studies of the slump test. • Compared to other commonly used concrete tests, such as for air content and compressive strength, the slump test provides acceptable precision.
Type of slump test are,True slumpShear slumpCollapse slump
A shear breaks off or crumbles. A slump stays together however it will slump down.
The importance of slump test in concrete work is to ensure consistency in the concrete. The test measures the workability of the concrete.
The importance of slump test in concrete work is to ensure consistency in the concrete. The test measures the workability of the concrete.
The concrete slump test is used to measure an aspect of concrete. This test is used to measure the workable of concrete as well as its freshness and health.
To check the consistency of the concrete; to determine if the concrete flow smoothly into the shape of the formwork. It is a quick check to see if the concrete is suitable for use.
Slump test is the most commonly used method of measuring workability of concretewhich can be employed either in laboratory or at site of work.It is seen that the slump test gives fairly good consistent results for a plastic-mix.
compaction factor test is better than slump test,because compaction factor test should have own compaction wight,so correct value will be find out from compaction factor test.........
The slump test gives fairly good consistent results for a plastic-mix. This test is not sensitive for a stiff-mix. In case of dry-mix, no variation can be detected between mixesof different workability. In the case of rich mixes, the value is often satisfactory, their slump being sensitive to variations in workability.
the workability of a concrete mixture