The CPAA Technical Note is related to a specific concrete pipe related issue to update stakeholders on any relevant changes that has occured or to highlight any significant issues that require attention.
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Crack Measurement by CCTV - The Facts (June 2015) CCTV can be a useful methold of general inspection but testing has proven that CCTV is not capable of making meaningful measurments.
Acceptance testing of concrete pipe (February 2013)
AS/NZS 4058 - 2007 is a performance-based Standard which requires the manufacturer to carry out a number of tests to demonstrate compliance with the Standard. This TN describes the two main performance tests for concrete pipe.
Installation of small diameter pipe under roads (November 2010)
Small diameter concrete pipe requires extra attention during installation. Particularly under roadways. This Technical Note provides specifiers and contractors with a practical guide to ensure that small diameter pipes are installed to AS/NZS3725 without compromise.
Installation in unstable conditions(March 2009)
AS/NZS3725 Design for installation of buried concrete pipes assumes that concrete pipe will be installed on an even surface. What happens though when you are confronted by unstable foundation?
Large Box Culverts (December 2013)
This Technical Note outlines the significant sections of the new large box culvert Standard, AS 1597.2:2013, and the likely impact it will have on industry, as well as alerting specifiers and contractors of changes related to manufactured product.
Update - small box culverts and AS 1597.1 (March 2011)
AS 1597.1, the small box culvert standard, was revised in 2010. There are a number of significant changes to this standard that will impact industry, in particular as it is the first revision of this document in 36 years. This Technical Notes explains what these changes are!
Durability & Environments
Biogenic Sulphuric Acid Attack on Concrete Pipe(September 2013)
It is recommended that when designing concrete sewers to resist this severe attack mechanism, designers should consider alternative solutions for the interior of the pipe to deal with the aggressive environment. This TN looks at this in some detail.
Steel studs and durability (March 2013)
In the manufacture of concrete pipes, cover to steel reinforcement is usually controlled by spacers, known as studs or nibs. AS/NZS 4058 recognises the inert characteristics of these studs on concrete pipe by stating that the concrete cover requirements do not apply to radial nibs, end spacers and longitudinal reinforcement ends. This TN explains why they do not pose durability concerns.
Environment exposure for SRCP(April 2009)
Concrete pipe is specified differently to typical concrete elements. Why - becuase generally it is buried under ground. This Technical Note explains what environments concrete pipe should be designed for and why.'
Specifying concrete for 100 years(November 2007)
Concrete pipe can be designed to last 100 years. This was ratified in 2007 by the most current version of the concrete pipe standard AS/NZS4058. For more details look at this Technical Note.
Curing, stripping and handling concrete pipe (May 2013)
Like all concrete, SRCP needs to cured to ensure that the product can perform as it is expected to. Proper curing of concrete pipe is vital to ensure that stripping times are efficient and that the product can be handled without concern before the pipe is put into the service. This TN explains how this process works.
Quality management systems for concrete pipe(March 2013)
To meet the exacting standards outlined in AS/NZS 4058, precast concrete pipe has to be manufactured under controlled conditions. To ensure that these procedures are followed, AS/NZS 4058 requires pipe manufacturers to have an auditable ISO 9001 Quality Management System that monitors and demonstrates compliance. This TN shows why this is in place and why it is so important.
Designing Rigid and Flexible Pipeline Systems (July 2013)
Design requirements for rigid and flexible pipe vary markedly. This Technical Note highlights 5 main design differences that should be considered when comparing rigid and flexible pipe.
Influence of bedding support on pipe class (February 2013)
Bedding support is provided to a buried concrete pipe to act as both the foundation and also to increase the load carrying capacity of the pipeline. This TN describes what influence the bedding support can have on the design.
Updating specification of SRCP(March 2009)
The concrete pipe standards AS/NZS4058 and AS/NZS3725 were updated in 2007. However, not everyone has updated their specifications to reflect this. This Technical Note outlines the important changes.