Sprayed concrete is the method by which concrete is sprayed into place, rather than the more conventionally used pouring or placing into formwork. According to the Sprayed Concrete Association other terms used include Gunite, Shot Concrete and Shotcrete.
There are many applications and uses for sprayed concrete. These include curved structures (including shell roofs and domes and tunnel linings) and free-formed structures (such as swimming pools and climbing walls). Applications also include underground construction, retailing walls and piled wall facings. Sprayed concrete is also commonly used to provide fire protection to steelwork and for strengthening and repair works to existing structures.
There are essentially two methods of application: the dry process and the wet process, typically installed by different specialist contractors and equipment. Both use high velocity air to propel.
Dry process sprayed concrete: a predetermined dry mix of cement and aggregate is propelled through a spraying nozzle, where a finely atomised spray of water is added to the stream of materials to hydrate the cement.
Wet process sprayed concrete: uses batched wet concrete pumped through a hose or pipe to a discharge nozzle where high pressure air propels the concrete into position.
Concrete mixes should be specially selected to suit each application. Your third party accredited supplier of ready-mixed concrete will ensure you are provided with the correct concrete for spraying suitable for your requirements, working to EN206: BS8500 the European and UK standards for concrete
Link to case studies:
- Darwin Centre
- Selfridges store, Birmingham
- (Little Hampton acoustic shell - featured in Concrete Elegance Dec 15
External links :
Introduction to sprayed concrete, ISBN:870980 08 5
Sprayed concrete Association 1999
Sprayed concrete association (SCA) http://www.sca.org.uk/
This guide focuses on the use of concrete at Coin Street Neighbourhood Centre and its part in creating a low energy building.
This guide focuses on concrete and masonry housing, and presents requirements for Part L1A of the Building Regulations.
An all-you-need-to-know guide on the specification of sustainable concrete.
Gives likely structural options for a concrete frame, with useful points to note - written by engineers for engineers.
A magazine to commemorate 70 years of Concrete Quarterly.
This publication seeks to provide information for structural engineers who are designing tall buildings in concrete.
This guide aims to enable designers to realise their aesthetic aspirations using concrete.
This document provides information on the material and resource efficiency of concrete and masonry.
£30.00 + VAT
This publication summarises the material used in the design of reinforced and prestressed concrete bridges using Eurocode 2
A magazine to celebrate 10 years of the concrete industry sustainable construction strategy.