Civil Engineer in South Africa - Volume 30, Issue 2, 1988
Volume 30, Issue 2, 1988
Source: Civil Engineer in South Africa 30, pp 63 –66 (1988)More Less
In the early seventies the well established use of polysulphide sealants in water-retaining structures was brought into question by the biological deterioration of a sealant in the Dunkeld Reservoir in Johannesburg. As a result, comprehensive studies were undertaken in South Africa and the UK on the mechanism of the degradation and the factors that influenced it. An accelerated biodegradation test was devised and used to determine the best combination of compounding ingredients for polysulphide sealants that are to be immersed in water. As a result of this work it is now possible to give firm guidelines for the polymer content, curative type and other ingredients to ensure the longevity of polysulphide sealants in any water environment. These recommendations are being confirmed by field trials. Nine years ago a polysulphide sealant designed according to these guidelines was installed in the same Dunkeld Reservoir in Johannesburg. A recent inspection indicated that it is still in perfect condition.
Author G. Van der MeulenSource: Civil Engineer in South Africa 30 (1988)More Less
Robert Leslie died peacefully at his home in Rondebosch on 14 September 1987. He was born 74 years earlier in Edinburgh. His father was a Professor of Economics and the Robert Leslie building at the University of Cape Town carries his name. Robert continued the tradition of lecturing at the University in the 1950s.
Author H. BastaniSource: Civil Engineer in South Africa 30, pp 67 –70 (1988)More Less
The failure of many projects in the Third World, and consequently the failure of the development initiative, is attributed to the application of conventional First World technical and managerial methodologies without regard to the particular characteristics and requirements of the developing areas. This paper reports on initial investigations into the problems involved in the management of planning and implementation of construction projects in the developing areas, suggesting a multidisciplinary approach to their design and structuring, in the light of the attitudes, resources and cultural and developmental characteristics of these areas.
Die mislukking van baie ondernemings in die Derde Wereld, en gevolglik die mislukking van die ontwikkelingsinisiatief, word toegeskryf aan die aanwending van gewone Eerste Wereldse tegniese en bestuursmetodiek sonder agting van die besondere eienskappe en behoefles van die ontwikkelende gebiede. Hierdie verhandeling doen verslag oor aanvangsondersoeke in verband met probleme in die bestuur van beplanning en uitvoering van konstruksieprojekte in die ontwikkelende gebiede en stel voor 'n multi-dissiplinere benadering tot hulle ontwerp en samestelling, in die lig van die houdings, hulpbronne en kulturele en ontwikkelingseienskappe van hierdie gebiede.