Isotherm goes green!
<BR>ACSA kick-starts construction of new central terminal building
<BR>e-go Solutions expands Africa operations to include satellite broadband solutions
<BR>Sinkhole adds to traffic blues
<BR>PHD joins Golder
<BR>Chryso admixtures for multi-billion dollar Qatar airport
<BR>Clay Brick Association predicts boom in building industry will continue
<BR>Product design awards
<BR>Update on SAPPMA
<BR>Developments in Port Elizabeth
<BR>Potain tower crane eases constraints on tight site
<BR>Bigen Africa to relocate to SA's first science park
<BR>Creative concrete in transport
<BR>New ownership initiative structured from solid foundations
<BR>Upgrading of the Pretoria State Theatre
This paper descriptionbes the essential features of a comprehensive scheme for the rational application of quality control in road construction. Methods are developed to determine the optimum values, from economic considerations, of the sample size, the percentage defect associated with the acceptance limit. The relationship between gain and the degree of compliance is studied and the results are of interest to both the contractor and the client. The availability of the required cost data is also discussed.
Recycling of water through domestic and industrial consumers could lead to more efficient use of water but the disposal of the final saline effluent presents a problem. The use of effluents for supplementary irrigation purposes suggests itself as a possible means of disposing of the soluble salts they contain. Such a scheme is feasible provided water, plant and soil are compatible, drainage is adequate and irrigation return flows do not enter the Vaal river above the Barrage.