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IS 1202:1978 is the Indian Standard (BIS) for methods for testing tar and bitumen: determination of specific gravity. This standard details the laboratory methods for determining the specific gravity of tar and bitumen using a specific gravity bottle, pycnometer, or displacement balance. Determining the specific gravity is crucial for volumetric calculations in asphalt mix design and converting measured mass into volume for quality control.
Describes the method for determining the specific gravity of tar and bitumen, crucial for quality control of waterproofing materials.
! Ensure all entrapped air is completely eliminated from the bitumen sample before final weighing (often done by gentle warming), as air bubbles will falsely lower the specific gravity result.
! Strict adherence to the 27°C water bath temperature is critical because bitumen density is highly temperature-sensitive.
! The specific gravity bottle method is typically used for liquid or less viscous semi-solid bitumens, while the pycnometer is better suited for harder semi-solid or solid materials.
tarbitumenasphalt
International Equivalents
Similar International Standards
ASTM D70-20ASTM International (US)
HighCurrent
Standard Test Method for Density/Relative Density of Semi-Solid Bituminous Materials (Pycnometer Method)
Defines the pycnometer method for determining specific gravity of semi-solid bituminous materials, same as IS 1202.
AASHTO T 228-21AASHTO (US)
HighCurrent
Standard Method of Test for Specific Gravity of Semi-Solid Bituminous Materials
Essentially identical to ASTM D70, providing a pycnometer-based method for specific gravity of bituminous binders.
EN 15326:2007CEN (European Committee for Standardization)
HighCurrent
Bitumen and bituminous binders - Determination of density and specific gravity - Capillary-stoppered pycnometer method
Specifies the capillary-stoppered pycnometer method for bitumen, directly aligning with the primary apparatus in IS 1202.
ASTM D3289-18ASTM International (US)
MediumCurrent
Standard Test Method for Density of Semi-Solid and Solid Bituminous Materials (Nickel Crucible Method)
Determines the same property (density/specific gravity) but utilizes a different apparatus (nickel crucible) and principle.
Key Differences
≠The standard test temperature in IS 1202 is 27°C, reflecting Indian climatic conditions, whereas ASTM D70, AASHTO T 228, and EN 15326 all specify 25°C as the primary test temperature.
≠IS 1202:1978 is an older standard and lacks the detailed precision and bias statements (repeatability and reproducibility limits) that are mandatory in modern standards like ASTM D70 and EN 15326.
≠IS 1202 explicitly includes 'tar' and 'cutback bitumen' in its scope, while modern international standards focus primarily on 'bituminous materials' or 'bitumen', with separate standards often covering cutbacks.
≠International standards like ASTM D70 provide more detailed guidance on apparatus specifications, such as suggesting a pycnometer capacity of 24 to 30 mL, while IS 1202 is more general, suggesting a capacity of 'about 50 ml'.
Key Similarities
≈All standards (IS 1202, ASTM D70, EN 15326) are based on the same gravimetric principle of determining specific gravity by measuring the mass of the material and the mass of an equal volume of water.
≈The primary apparatus, a specific gravity bottle (pycnometer) with a capillary-stopper, is a common feature across all the highly similar standards.
≈The fundamental procedural steps are identical: weighing the pycnometer empty, then with water, then with the sample, and finally with the sample and water to fill the remaining volume.
≈All standards require the use of a thermostatically controlled water bath to maintain the specified test temperature with a high degree of accuracy (typically ±0.1°C).
Parameter Comparison
Parameter
IS Value
International
Source
Standard Test Temperature
27 °C
25 °C (77 °F)
ASTM D70, EN 15326
Water Reference Temperature
27 °C
25 °C (Same as test temp.)
ASTM D70
Water Bath Temperature Tolerance
± 0.1 °C
± 0.1 °C (± 0.2 °F)
ASTM D70, AASHTO T 228
Calculation Formula (Relative Density)
SG = (c-a) / ((b-a) - (d-c))
RD = (C-A) / [(B-A) - (D-C)]
ASTM D70
Reporting Resolution
Nearest 0.001
Four significant figures (e.g., 1.034)
ASTM D70
Repeatability Limit (Single Operator)
Not specified
0.004
ASTM D70
Reproducibility Limit (Multi-Laboratory)
Not specified
0.006
ASTM D70
⚠ Verify details from original standards before use
Key Values3
Quick Reference Values
Standard test temperature27°C
Temperature tolerance for water bath± 0.1°C
Specific gravity bottle capacity50 ml
Key Formulas
Specific Gravity = (W3 - W1) / ((W2 - W1) - (W4 - W3)) — where W1=weight of empty bottle, W2=weight of bottle filled with water, W3=weight of bottle partially filled with bitumen, W4=weight of bottle + bitumen + filled with water
What is the standard testing temperature for the specific gravity of bitumen in India?+
The test is conducted at a standard temperature of 27°C ± 0.1°C.
Why is it necessary to determine the specific gravity of bitumen?+
It allows engineers to convert the weight of bitumen into volume, which is essential for accurate voids calculation and volumetric analysis in bituminous mix design (e.g., Marshall Mix Design).
What is the typical specific gravity of paving grade bitumen?+
Typically, the specific gravity of paving grade bitumen ranges between 0.97 and 1.02 at 27°C.