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IS 7320:1974 is the Indian Standard (BIS) for concrete slump test apparatus. This standard specifies the material, dimensions, and constructional details for the apparatus used in the concrete slump test. It covers the slump cone (mould) and the tamping rod, ensuring uniformity and accuracy in testing the workability of fresh concrete.
Specification for concrete slump test apparatus
Overview
Status
Current
Usage level
Essential
Domain
Materials Science — Cement, Concrete, Aggregates and RCC
Testing concrete. Method for determination of slump
Historically specified the apparatus for the slump test in the UK, with specifications very similar to the IS code.
ISO 1920-2:2016ISO (International Organization for Standardization)
HighCurrent
Testing of concrete — Part 2: Properties of fresh concrete
Includes specifications for the slump cone apparatus as part of determining the properties of fresh concrete.
Key Differences
≠The dimensional tolerances for the slump cone are stricter in the IS code (±2 mm) compared to ASTM C143 (±3 mm) for the top diameter, bottom diameter, and height.
≠The tamping rod length in IS 7320 is specified as a fixed 600 mm, whereas ASTM C143 allows a range from 400 mm to 600 mm.
≠ASTM C143 provides specific tolerances for the hemispherical tip of the tamping rod (radius of 8 ± 2 mm), while IS 7320 simply states the tip should be 'hemispherical' without dimensional tolerance.
≠The minimum metal thickness for the mould is slightly different: IS 7320 requires it to be not less than 1.6 mm, while ASTM C143 specifies at least 1.5 mm.
Key Similarities
≈The fundamental nominal dimensions of the slump cone (frustum) are identical: 100 mm top diameter, 200 mm bottom diameter, and 300 mm height.
≈Both standards specify a tamping rod with a nominal diameter of 16 mm (5/8 inch).
≈Both standards require the tamping rod to have a hemispherical tip to avoid fracturing the aggregate during tamping.
≈The apparatus in both standards requires the mould to be fitted with handles and foot pieces to hold it steady during filling and tamping.
Parameter Comparison
Parameter
IS Value
International
Source
Mould Top Diameter
100 ± 2 mm
100 ± 3 mm
ASTM C143
Mould Bottom Diameter
200 ± 2 mm
200 ± 3 mm
ASTM C143
Mould Height
300 ± 2 mm
300 ± 3 mm
ASTM C143
Mould Metal Thickness (min)
1.6 mm
1.5 mm
ASTM C143
Tamping Rod Diameter
16 mm
16 ± 2 mm
ASTM C143
Tamping Rod Length
600 mm
400 to 600 mm
ASTM C143
Tamping Rod Tip
Hemispherical
Hemispherical tip, radius 8 ± 2 mm
ASTM C143
⚠ Verify details from original standards before use