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IS 1199:2018 Part 3 is the Indian Standard (BIS) for fresh concrete - methods of sampling and testing - part 3: determination of compacting factor. This standard specifies the procedure for determining the workability and consistency of fresh concrete using the slump cone test. It is universally used by engineers on construction sites to verify that delivered concrete has the specified fluidity before it is placed.
Specifies the procedure for determining the compacting factor of fresh concrete.
! The slump measurement is taken from the highest point of the slumped concrete to the underside of the tamping rod placed over the mould.
! If the concrete shears (one half slides down along an inclined plane) or collapses completely laterally, the test is invalid and must be repeated from the same batch.
! The base plate must be placed on a level, rigid, and horizontal surface free from vibrations.
Standard Test Method for Slump of Hydraulic-Cement Concrete
Specifies the procedure for determining the slump of fresh hydraulic-cement concrete.
EN 12350-2:2019CEN (European Committee for Standardization)
HighCurrent
Testing fresh concrete - Part 2: Slump test
Defines the method for determining the consistency of fresh concrete using the slump test.
BS EN 12350-2:2019BSI (UK)
HighCurrent
Testing fresh concrete. Slump test
The UK's adoption of the European standard for determining fresh concrete slump.
ISO 1920-2:2016ISO (International)
HighCurrent
Testing of concrete — Part 2: Properties of fresh concrete
Includes the slump test method as one of several tests for fresh concrete properties.
Key Differences
≠The time specified for lifting the slump cone is different. IS 1199 requires lifting the mould vertically in 5 to 10 seconds, whereas ASTM C143 specifies a stricter and faster duration of 5 ± 2 seconds (i.e., 3 to 7 seconds).
≠The procedure for handling a shear or collapse slump differs. IS 1199 states that if a repeat test also results in a shear/collapse, the result should be recorded. ASTM C143, however, states that if two consecutive tests result in a shear, the concrete likely lacks the cohesiveness for the slump test to be applicable, implying the test method is invalid for that sample.
≠There is a difference in the specified length of the tamping rod. IS 1199 specifies a fixed length of 600 ± 5 mm. ASTM C143 allows for a range, specifying a length of not less than 400 mm and not more than 600 mm.
Key Similarities
≈The fundamental dimensions of the slump cone (mould) are identical: a frustum with a base diameter of 200 mm, a top diameter of 100 mm, and a height of 300 mm.
≈The procedure for filling the mould is the same in both standards: the concrete is placed in three layers of approximately equal volume.
≈The tamping procedure is identical. Each of the three layers must be tamped 25 times with a standardized tamping rod, with strokes distributed evenly over the cross-section.
≈The method of measurement and reporting precision are the same. Slump is measured as the vertical distance from the top of the mould to the displaced center of the specimen, and the result is recorded to the nearest 5 mm.
Parameter Comparison
Parameter
IS Value
International
Source
Mould Height
300 mm
300 ± 2 mm
ASTM C143 / C143M-22
Mould Lifting Time
5 s to 10 s
5 ± 2 s (3 s to 7 s)
ASTM C143 / C143M-22
Tamping Rod Length
600 ± 5 mm
400 mm to 600 mm
ASTM C143 / C143M-22
Tamping Rod Diameter
16 ± 1 mm
16 ± 2 mm
ASTM C143 / C143M-22
Number of Layers
3
3
ASTM C143 / C143M-22
Strokes per Layer
25
25
ASTM C143 / C143M-22
Reporting Increment
Nearest 5 mm
Nearest 5 mm [1/4 in.]
ASTM C143 / C143M-22
Action on 2nd Shear Slump
Record the result
Test is not applicable to the concrete
ASTM C143 / C143M-22
⚠ Verify details from original standards before use
Key Values9
Quick Reference Values
Top diameter of slump cone100 ± 2 mm
Bottom diameter of slump cone200 ± 2 mm
Height of slump cone300 ± 2 mm
Tamping rod diameter16 ± 1 mm
Tamping rod length600 ± 5 mm
Number of layers for filling3 equal layers (by volume)
Tamping strokes per layer25 strokes
Time to lift the mould5 to 10 seconds
Total time to complete testMax 150 seconds from start of filling
Key Formulas
Compacting Factor = m1 / m2 (where m1 is the mass of partially compacted concrete, m2 is the mass of fully compacted concrete)