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Standardization plays an important role in the manufacturing o f a product. It enables
industries to produce large runs o f component parts that are guaranteed to be compatible
and interchangeable. The first publication o f national standard for concrete non-pressure
pipes was in 1979 and it has not been updated ever since. This study aims to identify the
new technologies, testing methods and enhancement o f concrete non pressure pipes and
introduce and include findings in Sri Lankan standard specification for concrete non
pressure pipes.
Concrete non pressure pipes are widely used in irrigation, sewer discharges, drainages
and culverts. As a material, concrete is strong and lasts for years with zero maintenance
and the steel structure as reinforcement gives good strength to use in heavy-duty
application. The basic materials o f concrete non pressure pipe are fine and coarse
aggregate, ordinary Portland cement, steel bars and wires, water and admixture. These
materials are combined in a systematic way, using quantities and proportions specially
designed for each product. Cement are mixed with aggregates, water and admixture to
provide a concrete mix which is formed into pipes by a process known as the dry cast
process. Centrifugal methods and vertical vibration methods are used to dense and pack
concrete throughout the pipe mould.
The data would be collected by referring the existing national standards, journals,
overseas standards, technical documents which are related to concrete non pressure pipes.
Information from related parties to identify the developing consumer requirements, safety
requirements and national regulation requirements within the past three decades will be
considered as primary data. The collected data would be analyzed to prepare the revision
o f Sri Lankan Standard Specifications for concrete non pressure pipes. According to
analyzed data, size classes and strength classes determined by using computational
method (M athematica Programing) and new internationally accepted testing methods also
introduced to the specification.
The findings o f this study will assist the quality and cover all the important requirements
of the concrete non pressure pipes manufacturing in Sri Lanka.
