This paper presents the results of a series of studies and monitoring evaluations along with remedial construction activities directed toward reducing seepage and pollution migration by the proper use of tailings management.
In view of the fact that the practising design engineer is on occasion faced with conflicting data and recommendations regarding the evaluation of punching shear capacity of reinforced concrete slabs, a fairly extensive laboratory test programme has been undertaken in this field. The test results have generally been compared with a suitable selection of current code approaches, principally through the use of the examination of certain structural case studies. The research findings are summarized diagrammatically and some design recommendations are proposed.
In 1983, a section of the M2 motorway in Johannesburg was showing signs of severe distress and the Johannesburg City Council commissioned the National Institute for Transport and Road Research to evaluate the pavement structure and recommend remedial measures. Alternative methods of rehabilitation were considered and reasons are given for the chosen method. This basically consisted of removing the existing structure at night using a milling contractor and resurtacing departmentally during the day. The work was well planned and given wide publicity. The method used for controlling traffic and details of the rehabilitation work together with unique problems encountered and final costs are discussed in the paper.