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Aggregate
Construction aggregate, or simply aggregate, is a broad category of coarse- to medium-grained particulate material used in construction. Traditionally, it includes natural materials such as sand, gravel, crushed stone. As with other types of aggregates, it is a component of composite materials, particularly concrete and asphalt. Aggregates are the most mined materials in the world,[1][2] being a significant part of 6 billion tons of concrete produced per year.[3] Aggregate serves as reinforcement to add strength to the resulting material. Due to the relatively high hydraulic conductivity as compared to most soil types, aggregates are widely used in drainage applications such as foundation and French drains, septic drain fields, retaining wall drains, and roadside edge drains. Aggregates are also used as base material under building foundations, roads, and railroads (aggregate base). It has predictable, uniform properties, preventing differential settling under the road or building. Aggregates are also used as a low-cost extender that binds with more expensive cement or asphalt to form concrete. Although most kinds of aggregate require a form of binding agent, there are types of self-binding aggregate which require no form of binding agent.[4] More recently, recycled concrete and geosynthetic materials have also been used as aggregates.
Woodhall Spa is a former spa town and civil parish in the East Lindsey district of Lincolnshire, England, on the southern edge of the Lincolnshire Wolds, 6 miles (10 km) south-west of Horncastle, 23 miles (37 km) west of Skegness, 15 miles (24 km) east-south-east of Lincoln and 17 miles (27 km) north-west of Boston. It is noted for its mineral springs, historic cinema and its Second World War association with the RAF 617 Squadron, commonly referred to as 'The Dambusters'.
Much of the village's Victorian elegance remains, with large parts of the centre being designated as a conservation area since January 1991.[2]
