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From the organisers of

M

Mortar

Mixture of fine aggregate with water and cement or lime, or a combination of both, that hardens after application and is used for jointing.

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MPA

  1. abbr. Mineral Products Association. Trade association for the aggregates, asphalt, cement, concrete, lime, mortar & silica sand industries. Formed in 2009 by the merger of the Quarry Products Association (QPA), British Cement Association (BCA) and The Concrete Centre
  2. mineral planning authority
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Mobile Crusher

A crusher that may be moved rather than fixed within the structure of a plant.  The machine is mounted in a frame which may have wheels (towed) or crawler tracks (self-propelled).

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Glossary image: 
Mobile crusher

Microwave

A form of electromagnetic radiation of relatively long wave length most commonly employed for heating materials containing water moisture. Can also be the basis of communication systems.

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Mulch

Any substance spread or allowed to remain on the soil surface to conserve soil moisture and shield soil particles from the erosive forces of raindrops and runoff.

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MOT 2

A common term used to refer to SHW type 2 subbase, the product defined by the Specification for Highway Works which is used to provide structural support below roads and also for building.

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MOT 1

A common term used to refer to SHW type 1 sub-base, the product defined by the Specification for Highway Works which is used to provide structural support below roads and also for buildings.

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