Copy of `University of Wales - Concrete info`

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University of Wales - Concrete info
Category: Architecture and Buildings > Ready-mixed concrete
Date & country: 03/12/2007, UK
Words: 20


Active waste
All waste not exempt or inert under the Landfill Tax Regulations [1996] – principally waste containing organic matter such as vegetation, wood or other putrescible matter but excluding household waste.

Agitator truck
Lorry with mixing drum to transport wet concrete to site

Arisings
Surplus materials produced during the course of a civil engineering operation, for example the soft soil removed and replaced with better material to allow the construction of a floor or a road. These are waste materials if there is no use available for them on the site at which they are produced.

Batching plant
Central plant for mixing concrete, from which it is delivered to the point of use in agitator trucks

Creep coefficient
A measure of the tendency of some structural materials to continue to deflect over a long time period without increase in the load that they are being required to carry.

Design and construct
Form of contract for civil engineering works in which a competitive tender is usually invited to choose a contractor to both design and construct the works. This is thought to give a client a cost and time saving

Drying shrinkage
The initial, irrecoverable shrinkage of concrete after hardening

Hard waste
Inert materials such as concrete and brick rubble from construction and demolition, and bituminous materials from the excavation or resurfacing of pavements

Lane rental
Contract form in road refurbishment in which the contractor has to pay a ‘rental` for the areas of the road which are occupied by the works. This is intended to reflect the cost to the public of the delays caused by restrictions to the road capacity.

Mtpa
Million tonnes per annum

Pavement construction
The construction of roads and all other similar structures such as airfield runways, car and lorry parks and industrial site accesses.

Pour [of concrete]
The unit of work formed by the amount of wet concrete that can be placed practically in one continuous operation.

Precast construction
Construction method where concrete building elements are cast away from their final position, often in a distant factory, and then erected and joined together on site.

Primary aggregate
Gravel, crushed rock and sea-dredged materials supplied 'new' to the user [in contrast to secondary aggregates].

RCA
Recycled concrete aggregate – crushed concrete, washed and graded for use as an aggregate in the production of further concrete.

Rheological
Relating to the flow properties of the wet concrete

Secondary aggregates
Construction materials derived from wastes used in place of 'new' stone, rock and gravel. This includes rock-based materials like crushed concrete and also industrial waste products such as blast-furnace slag.

Sub-base
Good quality crushed and graded aggregate used as the top layer of road construction, immediately below the bitumen- or cement- bound surfacing. A valuable product, much of which is provided by primary crushed rock aggregates like granite or limestone. Crushed concrete can be processed to provide a completely satisfactory alternative.

Water demand
The amount of water needed to make satisfactory concrete varies with different aggregates. This amount is termed the water demand. When more water is included in a mix, then more cement can be required to give the same strength.

Wet [concrete]
Concrete before it has set