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Chipseal (also chip seal or chip and seal) is a pavement surface treatment that combines one or more layers of asphalt with one or more layers of fine aggregate. In the United States, chipseals are typically used on rural roads carrying lower traffic volumes, and the process is often referred to as asphaltic surface treatment .
Woodchips used for chemical pulp must be relatively uniform in size and free of bark. The optimum size varies with the wood species. [12] It is important to avoid damage to the wood fibres as this is important for the pulp properties. For roundwood it is most common to use disk chippers.
Low quality, local aggregates are often used in Otta seal. The largest aggregate size used is between 13 and 25mm (0.5 and 1 inch). The aggregate can contain up to 10% fine gravels. Aggregate quantities are usually close to 27 kg/m 2 (50 lbs/yard 2). Otta seal is easily cured by blinding with sand because of its soft binders.
Asphalt batch mix plant A machine laying asphalt concrete, fed from a dump truck. Asphalt concrete (commonly called asphalt, [1] blacktop, or pavement in North America, and tarmac or bitumen macadam in the United Kingdom and the Republic of Ireland) is a composite material commonly used to surface roads, parking lots, airports, and the core of embankment dams. [2]
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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