RESOURCE PRODUCED BY CSIR BUILDING AND CONSTRUCTION TECHNOLOGY & CSIR ROADS AND TRANSPORT TECHNOLOGY
RESOURCE PRODUCED BY CSIR BUILDING AND CONSTRUCTION TECHNOLOGY & CSIR ROADS AND TRANSPORT TECHNOLOGY |
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Improving transport accessibility for people with disabilities A cost-benefit approach to the identification of well-located land for low-income housing developmentWater services: is franchising feasible? Improvement of the aggregate interlock equation used in the cncPave software package Building quality index for houses CSIR's fire investigation team in demand SB'04 Africa - Regional Conference on Building and Construction Sustainable building workshops CSIR's Dr Sharon Biermann nominated for prestigious national award E N Q U I R I E S |
Following the upgrading of the old Concrete Pavement Design and Construction Manual (Manual M10, 1995) to a design process based on mechanistic design principles (the cncPave software package), the previous relationship modelling the mechanism of concrete joints in shear (aggregate interlock) was found to be inaccurate, especially for the smaller-sized coarse aggregates used in the construction of concrete. A study was subsequently undertaken at the University of Pretoria to improve the aggregate interlock equation used in the software. The main objective of the study was to investigate existing methods for modelling aggregate interlock shear transfer efficiency and use that as the basis to develop a mechanistic model simulating variations in joint load transfer efficiency with joint opening, load magnitude, sub-base characteristics, and concrete aggregate properties. A secondary objective was to investigate the difference in pavement response to static and moving impulse or dynamic loads (equivalent to traffic loads) in terms of deflections across the joint in the pavement. Brink's paper explains the concept of aggregate interlock, followed by an overview of the research conducted into aggregate interlock in South Africa during the past two decades. A summary of the laboratory programme, the analysis of the data and the application of the model are presented, as well as conclusions reached from the study and recommendations for further research. Related links:
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E M A I L
A paper by CSIR Roads and Transport Technology's Dr Anna-Carin Brink highlights the contribution of a study conducted at the University of Pretoria to the improvement of the aggregate interlock equation used in the new mechanistic concrete pavement design method, cncPave. Dr Brink's paper recently won the award for best paper at the 23rd Annual Southern African Transport Conference in Pretoria.
