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.
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.
The prediction of collapse settlement of soil masses has long been a problematic subject, especially in Southern Africa where the engineer often has to contend with compaction of soil structures In large tracts of semi-arid and arid land and where transported and residual soils with a collapsing grain structure are commonly encountered.
Dr Lloyd delivered his Presidential Address to the Associated Scientific and Technical Societies of South Africa (AS & TS) on 25 November 1987. It is being printed in The Civil Engineer in South Africa by special agreement with the AS & TS.