A fifth CMA Premier Award was presented in the Innovative Concrete Products category where Southern Pipeline Contractors carried off the trophy for the specialised precast concrete noise barriers that have been installed in specific residential and commercial areas along the Gautrain route. The concrete barriers are designed to curb excessive noise pollution and are the first such products to have been developed in southern Africa.
The noise barriers are of two types: 100mm thick reinforced concrete panels which are designed as sound reflective barriers, and acoustic tiles which are manufactured with concrete and imported wooden chips and mounted on reinforced concrete panels – they act as sound mitigation barriers. The wood-fibre concrete is light and porous, so it reduces sound intensity.
The tiles were tested at the acoustic laboratory of the SABS (South African Bureau of Standards) for compliance with specified sound absorption coefficients across a wide range of frequencies.
Compaction and shape were important design aspects to provide for durability, sound absorption and an effective absorption area with optimal ratios.
Bombela Civils JV served as the engineers and quantity surveyors on this project.