What is the maximum allowed Los Angeles Abrasion value for aggregates in a wearing course?

30% for normal traffic conditions, as per Table 1.

What is the maximum limit for water absorption in aggregates for bituminous mixes?

The maximum water absorption is 2% by weight, as per Table 4.

What is the requirement for Polished Stone Value (PSV)?

For surface courses on high-traffic roads, a minimum PSV of 55 is required as per Clause 5.2 and Table 1.

What is the maximum combined flakiness and elongation index?

The maximum limit is 35% for most applications, as specified in Table 3.

IS 14798

: 2000

Aggregates for Bituminous Paving Mixes - Specification

CurrentFrequently UsedSpecificationTransportation · Aggregates and Sand

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This standard specifies the requirements for aggregates sourced from natural rock for use in various bituminous paving mixes for road and airfield construction. It outlines the necessary physical properties like strength, toughness, and durability, as well as the particle size distribution (grading) for different pavement layers.

Specifies requirements for aggregates used in the production of various types of bituminous paving mixes for roads and airfields.

Quick Reference Values

Max Los Angeles Abrasion Value for Surface Course30%

Max Aggregate Impact Value for Surface Course24%

Max Combined Flakiness and Elongation Index35%

Max Water Absorption2%

Minimum Polished Stone Value (PSV) for high traffic55

Max Soundness loss with Sodium Sulphate (5 cycles)12%

Practical Notes

The requirements for aggregate properties in Table 1, such as LA Abrasion and Impact Value, vary significantly depending on the pavement layer (e.g., Surface Course vs. Binder Course). Always check the correct row for your application.

This IS code is almost always used in conjunction with the Ministry of Road Transport and Highways (MoRTH) 'Specifications for Road and Bridge Works', which may impose stricter limits.

The combined Flakiness and Elongation Index is a critical parameter for mix workability and pavement stability. It is often a point of rejection for aggregate supplies.