Sand and Gravel
 

Crushed Stone


Crushed Stone

Crushed stone aggregates are produced from many natural deposits including; limestone, granite, trap rock and other durable mineral resources.
Production of these products requires blasting and excavating the broken stone from quarries followed by progressive stages of crushing, screening, washing and blending.
Our aggregate products range in size from Rip-Rap, where each stone may weigh several tons, to manufactured sand for use in concrete and asphalt products.
The numerous sizes and gradations are determined by their intended use and each complies with the specifications established by governmental agencies or our customer's requirements.
Crushed stone is used in the construction of highways, railroads, airports, water and sewage systems, office buildings, factories and our homes.
Beyond these "aggregate" uses, crushed rock is also manufactured into fertilizer and mineral components used in: roofing shingles, animal feeds, toothpaste and many other household products.


Sand and Gravel

Sand and Gravel
Sand and gravel aggregate is produced in each of Aggregate Industries' regional business units.
These resources, harvested from both glacial and alluvial deposits, are processed by a series of crushing, screening and washing operations.
The aggregate produced is subsequently used in the manufacture of ready mixed concrete, asphalt, pre-cast concrete products and as natural mineral base and for many other uses in most construction projects.
Our diligent quality control and flexible processing plants ensure that a wide variety of products are available to meet the needs and specifications of federal, state and local agencies, as well as commercial and residential contractors.
Our sand and gravel products are also used for ice control to keep highways safe during inclement weather, for filtration purposes and have been used to rebuild beach environments along the shores of Lake Michigan. Aggregate Industries utilizes trucks, railroads and barges to deliver these products to our customers.


Sand and Gravel


Sand and Gravel Mining for Aggregate

Sand and gravel are crucial resources to economic development activities, such as road building and concrete production. Construction of one mile of four-lane interstate highway requires 85,000 tons of aggregate; the average six room house requires 90 tons. "Aggregate" is any of several hard inert materials (as sand, gravel, or slag) used for mixing with a cementing material to form concrete, mortar, or plaster.
   Sierra Leone is fortunate in having an abundance of sand and gravel well distributed throughout the state.

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SIERRA LEONE - SL  

 
 
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