WHAT IS SLUMP TEST
SLUMP TEST OF FRESH CONCRETE
AIM:- To determine the workability of fresh concrete by slump test asper IS 1199-1959.
PRINCIPLE:- Slump test is most common used test for measuring consistency of concrete. It can be employed either in laboratory or at field.
APPARATUS AND MATERIALS:-
- Slump cone
It is a metallic mould in the form of frutusum of a cone with internal dimensions as follows:
Bottom diameter - 20 cm
Top diameter - 10 cm
Height of cone - 30 cm
The bottom and top ends of the mould are open, parallel to each other and right angle to the axis of cone.
- Tamping rod which have diameter 16 mm and length 0.6 m.
- Fresh concrete
- The internal surface of the mould is thoroughly cleaned and free from super flurois moisture and adherence of any old set concrete before commencing the test.
- The mould is placed on a smooth, horizontal and non absorbent surface.
- The mould is filled with concrete in 4 equal layers. Each layer is tamped with 25 strokes of tamping rod.
- After the top layer has been tamped the concrete is stuck off the level with the trowel.
- The mould is removed from the concrete immediately by raising it slowly in the verticle direction.
- The difference in level between the height of the cone and that of the highest point of the subsided concrete is measured.
- This difference in height in mm is the slump of the concrete.
- True slump
- Shear slump
- Collapse slump
2. Shear slump:- If one half of the concrete cone slides down, it is called shear slump. The shear slump is measured as a difference in height between the height of the cone and the average value of subsided Concrete.
3. Collapse slump:- If the concrete is more leaner then it will collapse after removing cone it is called as collapse slump.
This information is meaningful and magnificent which you have shared here. I am impressed by the details that you have shared in this post and It reveals how nicely you understand this subject. San Antonio contractors
ReplyDelete