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Construction 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.
Northallerton (/nɔːrˈθælərtən/ nor-THAL-ər-tən) is a market town and civil parish in North Yorkshire, England. It is near the River Wiske in the Vale of Mowbray and had a population of 16,832 in 2011.[1] Northallerton is an administrative centre for York and North Yorkshire Combined Authority and North Yorkshire Council.[2]
There has been a settlement at Northallerton since Roman times. That grew in importance from the 11th century when King William II gifted land there to the Bishop of Durham, and it became an important religious centre. The Battle of the Standard fought nearby in 1138 involved the death of up to 12,000 Scots.[3]
Northallerton was an important stopping point for coaches on the road between Edinburgh and London until the arrival of the railway.[4]
