Slump cone test as per is code 1199 : 2018 - part 2

1.    What Is Slump Cone Test. 

Slump cone test is a simple site test carried out to determine the workability and consistency of fresh concrete.
Each sample shall be Remixed before carrying out the test.

2.      Why do I need a Slump cone test.

Concrete slump test measure to  fresh  concrete workability and consistency. Sometimes concrete too wet or too dry which can be unfavourable for the specific work.

3.      Sampling for Slump Test.                                            As per IS CODE 1199-Part-1

Fresh concrete sample shall be collected from a moving stream during discharge from :
Sample shall be tested immediately.

1. Mixer

2. Transit mixer

3. Pump Line

4. Boom Pressure

 

4.      Tolerance of Tamping Rod.                                      As per IS CODE 1199-Part-2 Clause. 4.3.2.2

The tamping rod shall be checked periodically to ensure compliance

Diameter

16 ± 1 MM Rounded Ends

Length

600 ± 5 MM Rounded Ends

 

5.      5.   Tolerance of Slump Cone Size.                            As per IS CODE 1199-Part-2 Clause. 4.3.2.1

a) Diameter of base	200 ± 2 MM
b) Diameter of top	100 ± 2 MM
c) Height	300 ± 2 MM

         
             d)  Thickness of mould at least  1.6 MM
             e) Mould shall be metallic, non-absorbent, with smooth internal surface and free from dents.

6.     

6.   Filling slump cone                                             As per IS CODE 1199-Part-2 Clause. 4.3.3

Slump cone shall be filled in 3 equal layers.
Using the steel tamping rod to tamp the concrete.
1.  Bottom layer
2.  Middle layer
3.  Top layer
Each layer shall be tamped 25 times using tamping rod.
Mould lift vertically In 5 second      ± 2 second
Finish the test within 180 second ( 3 Minutes )
Record the Slump value Measured to the nearest  5MM

7.      Test Result                                                            As per IS CODE 1199-Part-2 Clause. 4.3.4

Only True slump meets acceptance criteria as per IS 1199:2018

True Slump	Valid Result	The concrete settles evenly.
Shear slump	Invalid Test	There is a side slip  of concrete
Collapse slump	Invalid Test	The concrete break down completely.

             Note :- Specified slump in mix design  and Slump value as per Project specifications.
             Recommended ranges as per IS 456.
             In case of shear or collapse slump, a fresh sample shall be taken and test repeated.

8.      8.      WORKABILITY OF CONCRETE                                      As per IS CODE 456  Clause no.7.1  Page-17

WORKABILITY OF CONCRETE Recommended Ranges Slump value as per IS 456
Placing Conditions	Degree of Workability	Slump Value             ( MM )	Remarks
Blinding concrete: Pavement using pavers machine	Very Low	See 7.1.1	By pavers Machine
Mass concrete, lightly reinforced slabs, beams, walls & columns, floors, hand placed pavements,	Low	25 – 75 MM	Mass concreting work
Heavily reinforced slabs, beams, walls & columns.	Medium	50 – 100 MM	Low rise Building by pump
Trench fill, in-situ piling, tremie concrete, Drain , wall , slab		75 – 100 MM
Slab,beam,wall, column	High	100 – 150 MM	High Rise Building
Situ Pilling , tremie concrete	Very High	See 7.1.2

9.     Tool required for Slump cone test.

Tamping Rod  16 MM Dia 600 MM length.
Metal Slump cone   Top  100MM Bottom 200MM and  Height 300MM
Metal scoop
Measuring Tape
Thermometer
Metal plate Tray
Timer Clock.