Author:De Beer, MorrisDate:1992This paper summarises some of the main effects of non-linear, ie stress stiffening (in this case) behaviour of resilient elastic moduli of typical granular base pavement structures on the calculated deflection basin. The basin was characterized ...Read more
Author:Balmaceda, P; De Beer, MorrisDate:1992A methodology for evaluating the condition of jointed portland cement concrete pavements (JCP) by non-destructive deflection testing was recently applied on the National Route 4 (N4) between Middelburg and Witbank. A set of two calibrated ...Read more
Author:Grobler, JE; Rust, FC; Molenaar, PDate:Jul 1992This paper addresses the development of a design procedure for large-stone asphalt, the implementation thereof in two sets of trial sections, the correlation of engineering properties obtained in the laboratory with field properties, the ...Read more
Author:Van Assen, EJ; Vlok, M; Rust, FCDate:Aug 1992The poor performance of asphalt surfacings either during construction or in-service, can be very traumatic to contractor, client, consultant, road-user and ultimately to the taxpayer. The binder is quite often blamed, with or without ...Read more
Author:Rust, FC; Grobler, JE; Myburgh, PA; Hugo, FDate:Aug 1992This paper addresses the development of an analytically based design procedure for large-aggregate asphalt and its application in thirteen trial sections. The physical and engineering properties of the various materials are discussed and ...Read more
Author:Rust, FC; Coetser, K; Verhaeghe, Benoit MJADate:Aug 1992Large amounts of money are spent annually on sealing or overlaying cracked road pavements, however, the reflection of cracks through these materials is a problem experienced worldwide. In countries with well-developed road infrastructures ...Read more
Author:Horak, E; Rust, FCDate:Aug 1992Emulsion treatment of granular bases is used mostly as a rehabilitation option in South Africa. Emulsion treated bases (ETBs) have been used on an ad hoc basis in South Africa in the past. Considerable work has gone into the mix design of ...Read more
Author:Sanders, P; Van Huyssteen, S; De Beer, Morris; Venter, JHDate:1993Some important aspects relating to structural damage caused by abnormally loaded vehicles on a range of typical South African pavement types are described. A summary of a detailed case study is given as is the determination of pavement damage. ...Read more
Author:Semmelink, CJ; De Beer, MorrisDate:1993The paper briefly describes the K-mould and the dynamic loading and data acquisition system that was developed for the Division of Roads and Transport Technology (Transportek) K-mould. The loading system allows for the selection of the loading ...Read more
Author:Wolff, H; Visser, AT; De Beer, MorrisDate:1993A brief review of the theory of material behavour is given as background to a discussion on the behaviour of granular materials as determined, from accurate measurments of elastic and plastic strains under fullscale Heavy Vehicle Simulator ...Read more
Author:Van Aswegen, G; Mendecki, AJDate:Jan 1993In the present study, a method is proposed method to estimate strong ground motion from possible large events. The method was demonstrated in two ways. Firstly, the magnitude of ground motion was estimated at distances away from a vertical ...Read more
Author:Rust, FC; Du Plessis, L; Verhaeghe, Benoit MJA; Grobler, JEDate:Oct 1993Internationally, interest in accelerated pavement testing (APT) is increasing, in particular testing with mobile machines which allow the performance of in-service roads to be assessed. The Californian Department of Transportation (CALTRANS) ...Read more
Author:Meyer, CFDate:Nov 1993The aim of this project was to establish the needs of the industry with regard to bord and pillar ventilation requirements. In addition, the aim was to establish whether sufficient research has already been done by the mining industry and if ...Read more
Author:CSIRDate:1994This report provides highlights on the activities and achievements of CSIR in the year 1994. An outline of the CSIR structure and financial reports are also presented in the report.Read more
Author:Pardoe, DR; Molesworth, DVDate:Jan 1994In 1992, a proposal was submitted to SIMRAC for a two year programme of work with the overall objective of conducting a general review of problems and techniques related to underground colliery illumination, particular emphasis on identifying ...Read more
Author:Esterhuizen, GSDate:Jan 1994The mechanism of most seismic events is shear displacement along geological faults. Seismicity occurs if the slip takes place violently and kinetic energy is released into the surrounding rock. The rock surrounding the fault plane may be seen ...Read more
Author:Cichowicz, ADate:Jan 1994This report discusses the assessment of safety risk and the analysis of Falls Of Ground (FOG) in mines due to seismic events and mining layout during the period of 1991-1992 on a single mine. The multivariate analysis was used to obtain a ...Read more
Author:Hill, RWDate:Feb 1994The safety hazards associated with multiseam mining have been recognised and will depend on the mining sequence and method. Multiseam mining will continue in South Africa for the foreseeable future in order to maximize reserves at collieries. ...Read more
Author:Phillips, HR; Landman, GVRDate:Mar 1994The principal objective of this project has been to provide SIMCOL and its two sub-committees (COLEEAG and COLREAG) with a discussion document on research priorities. Work on the project commenced at the end of March 1993 and an interim report ...Read more
Author:Ashworth, SGE; Peake, AVDate:Mar 1994This report summarises both the statistical analysis of accident data and detailed accident case studies in attempt to make a complete conclusions of what causes the accidents in gold and platinum mines. And also discusses the recommendations ...Read more