Slump test is the most widely used field test primarily because
In case the concrete is to be transported by pumping, the slump should be
If the slump of concrete mix, is 75 mm, its workability is considered to be
For a RCC slab the slump of concrete should be
Which cement is used in sewage and water treatment plants?
Cement with composition has very good resistance to sulphate attack. This type of cement is used in the construction of foundation in soil where subsoil contains very high proportions of sulphate.
The Vee-Bee test
Bleeding of concrete is said to occur when
Workability of concrete is independent of
The higher the cement aggregate ratio, the leaner is concrete. In lean concrete less quantity of paste is available for providing lubrication, per unit surface area of aggregate and hence the mobility of aggregate is restrained. On the other land in rich concrete mix with lower aggregate cement ratio more paste is available to make the mix cohesive to give better workability.
Workability is also reduced at higher temperature.
The conventional workability tests e.g. slump test, compacting factor test, Vee-Bee test and remoulding tests are termed single-point tests because
The most appropriate method to specify the concrete mix is by