Coarse Aggregate

Project Description

Construction aggregates, or simply “aggregates“, is a broad category of coarse particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregatesAggregates are the most mined materials in the world. The coarse aggerates located in Pine Cove, NL consist of the following two separate and distinct rock formations:

Diorite (Granite)

The diorite is a massive homogeneous deposit located directly adjacent to Port Rousse. This material is suitable for general construction, asphalt, concrete, rip-rap and armour.

Gabbro

This mafic volcanic cap rock is described as a dark greenish grey, slightly weathered, medium hard, metamorphized rock with calcium carbonate veins throughout. This rock is suitable for general construction (road base and in-fill) or asphalt.

Aggregate Acceptance Testing Results:

 

Item Test Procedure Diorite (Coarse) Gabbro (Coarse) Maximum Specification Limit
1. Sieve Analysis CSA A23.2-2A Various Various
2. Light Weight Particles CSA A23.2-4A ASTM C123 0.0% 0.0% 0.5% to 1.0% (2)
3. LA Abrasion CSA A23.2-16A 23.5% 18.7% 50%
4. Bulk Specific Gravity (SSD) ASTM D128 2.70 2.79
5. Absorption ASTM C127 0.6% .51%
6. Clay Lumps CSA A23.2-3A ASTM 142 0.0% 0.0% 0.3% to 0.5% (3)
7. Petrographic Number (PN) CSA A23.2-15A PN = 103 PN = 125 Recommended: 125 (For Class C1, C2, & F1) 140 (For other Concrete Classes)
8. Unconfined Freeze Thaw CSA A23.2-24A 0.4% 0.40% 6% to 10% (4)
9. Micro Deval CSA A23.2-29A 6.2% 15.8% 17% to 21%
10. Flat and Elongated Particle CSA A23.2-13A Procedure A Ratio 4:1 2.4% 4.9% 20%
11. Soundness CSA A23.2-9A 0.2% 0.6% 12% (For Class C1, C2, & F1) 18% (For other Concrete Classifications)
  1. The maximum allowable percentage of low-density granular materials in the coarse aggregate is 0.5% for exposure classifications F-1, C-1, and C-2 and 1.0% for other exposure conditions.
  2. The maximum allowable percentage of clay lumps in the coarse aggregate is 0.30% for exposure classifications F-1, C-1, and C-2 and 0.5% for other exposure conditions.
  3. The maximum percentage of loss from freeze thaw is coarse aggregate is 6% for exposure classifications F-1, C-1, and C-2 and 10% for other exposure conditions.

Project Details

  • Port Rousse