Fine Aggregates
Fine Aggregates Options
Materials for concrete paving may be crushed or uncrushed gravel, crushed stone, crushed blast-furnace slag, or recycled crushed PCC pavement for coarse aggregate; or natural or manufactured sand for fine aggregate. Fine aggregates size is about 0.075 to 0.425 mm.
Fine Aggregates Sources
Aggregate material should be sought in the area or vicinity of the project. Distant sources could incur transportation problems since freight train or long distance trucking would be required. The advice of local suppliers, contractors, or engineers should be sought to evaluate the optimal source of concrete aggregates.
Fine Aggregates Composition And Shape
Fine aggregate will consist of natural sand, manufactured sand, or a combination of the two, and will be composed of clean, hard, durable particles. Particles of the fine aggregate should be generally spherical or cubical in shape insofar' as practicable. The use of fine aggregate containing flat or elongated particles should be held to a minimum or when no other choice is available. Care must be taken to insure that contaminating substances are not present in fine aggregate stockpiles. Such substances would include dirt, dust, mud, and construction debris.
Fine Aggregates Gradation And Uniformity
The grading and uniformity specified for the fine aggregate are desirable for concrete pavement and can generally be met at reasonable cost with minimum time delay's. However, if these requirements create delays detrimental to the intent of the mobilization construction, the specification should be relaxed to provide for conformance with the 3/8 inch and No. 100 sieves only.
Aggregate For Calibration Hardstands
Calibration hardstands are used by aircraft technicians to calibrate flight instruments: with regard to the earth's magnetic field and hence, metallic objects of any kind will distort readings. This includes concrete pavements containing iron oxides or other iron-rich minerals having magnetic properties which will interfere with the operation of the facility. To avoid the inclusion of these substances in the pavement materials, the concrete aggregate proposed for paving calibration hardstands will be subjected to petro graphic analyses prior to acceptance. Special attention will be given to the existence of magnetite in granites, high-iron minerals in traprock, pyrite in limestone, and free iron or iron oxide in slag aggregate.
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