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IS 3865:1986 is the Indian Standard (BIS) for railway track ballast. This standard specifies the requirements for crushed stone ballast used in railway track construction, covering material types, physical properties, size grading, and testing methods.
Lays down the requirements for coarse aggregate used as ballast in railway tracks.
EN 13450:2002CEN - European Committee for Standardization (Europe)
HighCurrent
Aggregates for railway ballast
Specifies properties of natural, manufactured, or recycled aggregates for use as railway ballast.
AREMA Manual for Railway Engineering, Chapter 1, Part 2AREMA - American Railway Engineering and Maintenance-of-Way Association (USA)
HighCurrent
Ballast
Defines material, testing, and grading requirements for railway ballast in North American practice.
AS 2758.7:2015Standards Australia (Australia)
HighCurrent
Aggregates and rock for engineering purposes, Part 7: Railway ballast
Specifies requirements for source rock and properties of finished ballast for Australian railways.
UIC Code 719 RUIC - International Union of Railways (International)
MediumCurrent
Earthworks and Track-bed Layers for Railway Lines
Provides guidelines for track bed layers, including ballast, focusing on performance in a railway system context.
Key Differences
≠IS 3865 uses a 'Combined Flakiness and Elongation Index', while standards like EN 13450 specify separate limits for 'Flakiness Index' (FI) and 'Shape Index' (SI), providing more granular control.
≠Modern international standards (AREMA, EN 13450) mandate durability tests like Magnesium Sulfate Soundness or Freeze-Thaw resistance, which are absent in the 1986 version of the Indian standard.
≠IS 3865 specifies distinct grading requirements for different track gauges (Broad, Metre, Narrow), whereas EN 13450 and AREMA use a system of standardized grading categories (e.g., 31.5/50mm, AREMA No. 4) applicable across various line types.
≠EN 13450 uses a category-based system (e.g., LA_20, LA_25 for abrasion), allowing engineers to specify ballast quality based on traffic density and speed. IS 3865 provides single prescriptive limits.
Key Similarities
≈All standards mandate the use of hard, dense, durable crushed natural rock (e.g., granite, basalt, quartzite) and prohibit soft or porous materials.
≈The Los Angeles Abrasion (LAA) test is a common method across all standards for measuring the ballast's resistance to wear and abrasion.
≈All standards recognize the importance of an angular, cubical particle shape for achieving good mechanical interlock and track stability, and include tests to limit flat or elongated particles.
≈Strict limits on the content of fine particles and dust are a universal requirement to ensure proper drainage of the track structure.
Parameter Comparison
Parameter
IS Value
International
Source
Los Angeles Abrasion (LAA) Value
≤ 30% (for Broad Gauge)
≤ 25% (Category LA_25, typical for main lines)
EN 13450:2002
Aggregate Impact Value (AIV)
≤ 20% (for Broad Gauge)
Not directly specified; resistance to fragmentation is measured by the LAA test.
EN 13450:2002
Particle Shape (Flakiness & Elongation)
Combined Index ≤ 30%
Flakiness Index (FI) ≤ 20; Shape Index (SI) ≤ 20 (as separate parameters)
EN 13450:2002
Water Absorption
≤ 1.0%
≤ 1.0% (Category WA_24 1); ≤ 0.5% for high-speed lines
EN 13450:2002
Magnesium Sulfate Soundness (Durability)
Not Specified
≤ 18% loss after 5 cycles (Category MS_18)
EN 13450:2002
Typical Mainline Grading Size
Nominal 65 mm (Passing 80mm, Retained on 40mm)
31.5 mm to 50 mm (or 31.5 to 63 mm)
EN 13450:2002
Minimum Percentage of Crushed Faces
Not explicitly specified, but must be 'crushed stone'.
≥ 90% of particles with at least one crushed face (Category C_90/1)
EN 13450:2002
⚠ Verify details from original standards before use