Sand and gravel
Crushed stone - Sharp edges
River Stone -Cobble - - Smooth edges
Pea stone - Small river stone
Decorative Stone - Large stone for landscaping
See Construction Aggregates – Stone, Sand and Gravel – Todd's Redi-MixTodds Redi Mix
and Affordable Garden Path Ideas | The Family Handyman
Size - grading:
Some Common sizes:
MD #2 / AASHTO #3 Stone: 2 - 2 1/2"
MD #5 = 1 - 1 1/2"
MD #8 = 3/8 - 1/2"
MD #10 Stone Dust Fines/dust with up to 1/4"
ASTM #57 Stone 1 to 1-1/2"
CR-6 up to 1 1/2"
CR-8 - 1" minus crusher run. Commonly referred to as "Site pack" or "Quarry Process Stone" or "Road Base"
See Aggregrate Gradation Chart
Source: Project Planning and Estimating Resources | The Stone Store
- AASHTO - American Association of State Highway and Transportation Officials
- ASTM International, formerly known as American Society for Testing and Materials, is an international standards organization that develops and publishes voluntary consensus technical standards for a wide range of materials, products, systems, and services.
See Wikipedia and www.astm.org.
- CR - Crushed Rock ?
California bearing ratio (CBR) test is a penetration test for evaluation of the mechanical
behavior of road base and subbase course layers.
- Graded aggregate base (GAB)
- MD: Micro deval test Maryland
MD - A grading system for aggregates e.g. MD #1 = 3 1/2 - 4"; #2 - 2 - 2 1/2"; MD #8 = 3/8 - 1/2"
In soil mechanics, the void ratio describes the relationship between the volume of voids, or spaces, in the soil or aggregate to the volume of solid constituents, or grains. Algebraically, e = Vv /Vs, where e represents the void ratio, Vv represents the volume of voids and Vs represent the volume of solid grains.
Low density sand typically has a void ratio of about 0.8, while high density sand with angular particles typically has a void ratio about 0.4
Gravel typically has a void ratio about 0.4, regardless of whether it is well or poorly graded.
See: Void Ratio | Sciencing.com
- MDOT SHA - Maryland Department of Transportation State Highway Administration
- See Glossary of Terms
Construction Aggregates – Stone, Sand and Gravel – Todd's Redi-MixTodds Redi Mix
Aggregate Sizing Explained
Project Planning and Estimating Resources | The Stone Store
Crushed Stone Examples | paxcos.com
Development Of Design Guidelines For
Proper Selection Of Graded Aggregate Base
In Maryland State Highways
last updated 10 Oct 2018