The Design, Construction and Heavy Vehicle Simulator Testing Results on Roller Compacted Concrete Test Sections at the C
Although the use of Roller Compacted Concrete (RCC) is not new in South Africa, the use of it to construct roads is not that well known or studied. The Gauteng Provincial Department of Roads and Transport (GPDRT) in conjunction with CSIR Built Environment
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Abstract Although the use of Roller Compacted Concrete (RCC) is not new in South Africa, the use of it to construct roads is not that well known or studied. The Gauteng Provincial Department of Roads and Transport (GPDRT) in conjunction with CSIR Built Environment in South Africa and Cosal Consultants CC started a research program on the use of RCC technology for roads. Whereas RCC is normally constructed with a relatively low labor component using heavy mechanical equipment, one of the aims of this investigation was to evaluate the structural performance of RCC constructed with a relatively high labor component using hand-operated equipment. The evaluation was done using the Heavy Vehicle Simulator (HVS) of the GPDRT. This paper briefly details two investigations. One HVS RCC test was conducted at the CSIR innovation site and the other on a full-scale test road at Rayton, Gauteng. Through HVS testing it has been shown that this type of pavement performed well in the dry state, even when constructed on a substandard support system. Test results indicate that this type of pavement exceeded its predicted performance. The use of hand-labor for layer compaction is
W. Govu—Deceased. L. du Plessis (&) CSIR Built Environment, Meiring Naudé Street, Brummeria, Pretoria, South Africa e-mail: [email protected] G. Rugodho W. Govu K. Mngaza Gauteng Provincial Department of Roads and Transport, Private Bag X3, Lynn East, Pretoria 0039, South Africa e-mail: [email protected] K. Mngaza e-mail: [email protected] S. Musundi Cosal Consultants CC, PO Box 863, De Deur 1884, South Africa e-mail: [email protected] © Springer International Publishing Switzerland 2016 J.P. Aguiar-Moya et al. (eds.), The Roles of Accelerated Pavement Testing in Pavement Sustainability, DOI 10.1007/978-3-319-42797-3_50
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discouraged as this can lead to layer densities lower than acceptable standards, which result in poor performance. The importance of proper RCC mix design to mitigate the negative effects of shrinking and crack forming is highlighted in this study.
Keywords Heavy vehicle simulator testing Roller compacted concrete (RCC) Labor-based construction Pavement performance evaluation
1 Background The upgrading of unsurfaced residential roads has become a priority for many metropolitan areas in South Africa. Coupled with this is the need to construct roads using labor-intensive construction techniques. In 2007, the Gauteng Provincial Department of Roads and Transport initiated its Expanded Public Works Program (EPWP). The goals and objectives of the EPWP are to alleviate unemployment, targeting especially women, the youth and the disabled (Gauteng Provincial Government 2007). This goal will be achieved by creating work opportunities in the following four constructive ways: • • • •
Increasing the labor intensity of government-funded infrastructure projects; Creating work opportunities in public environmental programs; Creating work opportunities in public social programs, and Utili
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