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Another factor in stain removal is the fact that stains can sometimes comprise two separate staining agents, which require separate forms of removal. A machine oil stain could also contain traces of metal, for example. [1] Also of concern is the color of the material that is stained.
The porosity and makeup of most stone does, however, leave it prone to certain types of damage if unsealed. Staining is the most common form of damage. It is the result of oils or other liquids penetrating deeply into the capillary channels and depositing material that is effectively impossible to remove without destroying the stone.
Road spray is lessened on stone mastic asphalt and open-graded asphalt [11] and can be further reduced with fenders [20] (more so on a bicycle since most motor vehicles tend to already have fenders) and/or mud flaps. Street sweepers and winter service vehicles remove most solid road debris and the Adopt a Highway program also helps.
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An oil skimmer is a device that is designed to remove oil floating on a liquid surface. They are commonly used to recover oil from oil spills in water, or in Industrial situations where waters are contaminated with oil. Oil skimmers are designed to remove free floating oil and are not water treatment devices.
Size of stones was central to McAdam's road building theory. The lower 200-millimetre (7.9 in) road thickness was restricted to stones no larger than 75 millimetres (3.0 in). Modern tarmac was patented by British civil engineer Edgar Purnell Hooley, who noticed that spilled tar on the roadway kept the dust down and created a smooth surface. [12]
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Stone traffic lane markings in Lisbon, Portugal. In roads paved with setts (as in Belgian/Italian or Portuguese styles) or cobblestones, markings can be made with white blocks or stones, like marble or other light-coloured rocks. This kind of marking is long-lasting, but can be slippery in rain or wet conditions unless surfaced with a matte or ...