Civil Engineering Reference
In-Depth Information
If cores from these daily test panels are found to be sub-standard, then
cores should be taken from the
in situ
concrete sprayed on that day and
tested as required.
13.10 Conclusion
Whilst the above may indicate difficulties in controlling the quality of the
end product, the material has a higher than normal cement content and the
spraying process will only allow good material to pass through the system.
Problems, if any, are often associated with the skill of the nozzleman and it is
therefore imperative that only well-trained, competent ones are used.
13.11 Applications of sprayed concrete
The Sprayed Concrete Association's book
An Introduction to Sprayed Concrete
starts with the words 'Sprayed concrete is a versatile and economic method of
concrete placement, with endless possibilites …' and, yes, the list of actual and
potential applications is almost limitless but it succeeds most notably where
the use of rigid formwork is absent, e.g in strengthening and repairing:
• Sea and river walls
• Aqueducts
• Water towers
• Canal linings
• Ditches
• Concrete damaged by reinforcement corrosion
• Fire-damaged structures
• Cooling towers
• Bridges
•
Jetties and wharves
•
Brick arches and tunnels.
The Concrete Society's Technical Report No 56 (Concrete Society, 2002),
details a wealth of material on the use of sprayed concrete in repair. A typical
set of repair scenarios is given in
Table 13.3.
Acknowlegements
The author and editor would like to thank the Sprayed Concrete Association,
in particular Ken Dykes, for helpful comments in the preparation of this
chapter.
