Table of Contents

Appendix B 5 Product Specifications

The crushed rock shall be free from vegetable matter and lumps or balls of clay and shall comply with the relevant requirements of Table B.4.

Table B 4: Product requirements

TestTest values
BaseSubbase
Class 1 Class 2 Class 3 Class 4
Liquid Limit % (max) 30 30 35 40
Plasticity Index (max or range) (1) 2-6 0-6 12 20
California Bearing Ratio % (min) (2) 30 15
PI x % passing 0.425 AS sieve (max) 600
Flakiness index % (max) 35 35
crushed particles % (max) (3) 60 60 50
  1. Minimum value for PI specified to ensure the material is sufficiently impermeable to resist penetration of water through thin surfacing layers.
  2. Value applicable to material passing 19.0 mm sieve: compacted at Optimum Moisture Content to 98% of Modified Maximum Dry Density as determined by test; then soaked for 4 days prior to CBR testing.
  3. Applicable to crushed river gravels.