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In Europe, sizing ranges are specified as d/D, where the d shows the smallest and D shows the largest square mesh grating that the particles can pass. Application-specific preferred sizings are covered in European Standard EN 13043 for road construction, EN 13383 for larger armour stone, EN 12620 for concrete aggregate, EN 13242 for base layers of road construction, and EN 13450 for railway ...
Concrete landscape curbing (or concrete landscape bordering) is an alternative to plastic or metal landscape edging. Landscape curbing is made with various elements of concrete depending on the climate where it is being used. [1] Concrete landscape curbing has become more popular over the last decade with suppliers offering a variety of styling ...
A concrete finisher is a skilled tradesperson who works with concrete by placing, finishing, protecting and repairing concrete in engineering and construction projects. [ 1 ] [ 2 ] Concrete finishers are often responsible for setting the concrete forms , ensuring they have the correct depth and pitch.
Landscape contractors use various tools and machinery to construct a garden, including large equipment. Landscape contracting is: "a profession that involves the art and technology of landscape and garden project planning, construction and landscape management, and maintenance and gardening; for garden aesthetics, human enjoyment and safety, and ecosystem-plant community sustainability."
The Associated Landscape Contractors of America (ALCA) was founded in 1961. [1] In collaboration with NASA , the ALCA sponsored the NASA Clean Air Study , which was published in 1989. [ 2 ] After the study was published, the ALCA formed the Foliage for Clean Air Council, later renamed the Plants for Clean Air Council (PCAC), a nonprofit that ...
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A fish scale is a small rigid plate that grows out of the skin of a fish. The skin of most jawed fishes is covered with these protective scales, which can also provide effective camouflage through the use of reflection and colouration, as well as possible hydrodynamic advantages.