Product obtained when chalk or limestone is heated at a temperature high enough to drive off the carbon dioxide.
Roughly squared stone as shipped from the quarry.
Also: block stone
A management system that is designed to direct and control the quality of products and processes. Under the International Standard BS EN ISO 9001:2000, a quality management system is expected to identify the processes requiring control, determine the sequence and interaction of these processes, and continually monitor quality so that performance plans are met and improvements can be planned.
Produced by WRAP, it provides a uniform control process for producers of aggregates. From the protocol, the reprocessors can reasonably state and demonstrate that their product has been fully recovered and is no longer a waste. It also provides purchasers with a product quality-managed to common aggregate standards, thus increasing confidence in performance. Furthermore, the framework created by the Protocol provides a clear audit trail for those responsible for ensuring compliance with Waste Management Legislation.
An open pit or excavation from which stone, sand, gravel or mineral is extracted. For the legal meaning see section 180 of the Mines and Quarries Act 1954.
A levelling instrument supported on a ball-and socket joint instead of three levelling screws.
A metamorphic variety of sandstone composed of grains of quartz cemented together by silica. It is a very hard rock usually whitish in colour.
Oxide of silicon SiO2 (silica). Common mineral in acid igneous rocks and forms bulk of sandstones and quartzites.
The reduction of a sample to a desired volume by dividing a cone of material into four quarters and combining alternate quadrants. This is repeated until a sample of the required quantity is obtained.
The management functions which determine and implement a firm’s quality policy.