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Browsing by Author "De Beer, Morris"

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Exploring the role of motivational and coping resources in a Special Forces selection process

Author: De Beer, Morris ; Van Heerden, Adelai Date: Jul 2014 Orientation: Motivational and coping resources were explored within a military context by means of a mixed-methods survey study involving a group of Special Forces candidates. Research purpose: The purpose was to compare selected and ... Read more
Fate of inorganic contaminants post treatment of acid mine drainage by cryptocrystalline magnesite: Complimenting experimental results with a geochemical model

Author: Masindi, Vhahangwele ; Gitari, MW ; Tutu, H ; De Beer, Morris Date: Mar 2016 This study assessed the fate of inorganic contaminants post treatment of acid mine drainage by cryptocrystalline magnesite. To accomplish that, neutralization and metal attenuation were evaluated and complemented with simulations using ... Read more
Feedback on the Inaugural Meeting of the Cost 347 Accelerated Loading Test (ALT) Action in Europe: June 27th to 29th 2001

Author: De Beer, Morris Date: Nov 2001 Describes in summary the attendance of the author at an invited meeting of the COST 347 ALT (Accelerated Loading Testing) Committee in Cologne, Germany, Europe. The meeting was held at Bast, near Cologne, from 27th June 2001 to 29th June 2001. ... Read more
Field evaluation and computer simulation of undoweled transverse joints in rigid pavements

Author: Balmaceda, P ; De Beer, Morris Date: 1992 A 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
First steps in the development of a resilience measure

Author: De Beer, Morris ; Van Heerden, A Date: Nov 2016 The demands faced by those who work within a military context require individuals to cope with difficult and challenging circumstances – physically, cognitively, emotionally and socially. Thus the understanding and measurement of resilience ... Read more
Impact of tire loading and tire pressure on measured 3D contact stresses

Author: Hernandez, JA ; Al-Qadi, I ; De Beer, Morris Date: Jun 2013 Three-dimensional (3D) tire-pavement contact stresses for two types of tires used by the truck industry (new generation wide-base tire [WBT] and dual-tire assembly [DTA]) were measured and compared. The testing matrix was composed of five ... Read more
Important characteristics of operational force members

Author: Van Heerden, Adelai ; De Beer, Morris Date: Oct 2017 The operational forces military context is generally acknowledged as one of the most stressful contexts as it is demanding of members on a physical, psychological, social level with organisational, intra- and inter-personal demands of an ... Read more
Improved performance evaluation of road pavements by using measured tyre loading

Author: Maina, JW ; De Beer, Morris Date: Nov 2008 This paper presents evaluation of road pavement response under the loading of typical dual and single truck tyre configurations. Locally developed Stress-In-Motion (SIM) technology was used to quantify three-dimensional (3D) shapes of the ... Read more
Initial investigation into development of accelerated pavement evaluation (APE) vehicle

Author: Steyn, WJvdM ; De Beer, Morris Date: Aug 2002 CSIR Transportek has for many years been at the forefront of Accelerating Pavement Testing (APT) technology. The use of the HVS for research purpose has attracted much attention. One aspect of the HVS's capabilities has not been used that ... Read more
Integrated iron(II) oxidation and limestone neutralisation of acid mine water

Author: Maree, JP ; Strydom, WF ; De Beer, Morris Date: 1999 Volumetric iron (II) oxidation rates exceeding 100 g/(l.d) were achieved by dosing powdered limestone to a bio-reactor treating artificial acid mine water. Neutralisation and partial sulphate removal were achieved as well. The rate is highly ... Read more
Interim revision of the South African Mechanistic-Empirical pavement design method for flexible pavements

Author: Theyse, HL ; De Beer, Morris ; Maina, JW ; Kannemeyer, L Date: Sep 2011 Pavement design methods, in combination with network level management systems must enable road authorities to develop reliable long-term financial plans based on the estimated structural capacity of the road network. Inaccurate design models ... Read more
Introduction of new road pavement response modelling software by means of benchmarking

Author: Maina, JW ; Denneman, E ; De Beer, Morris Date: Jul 2008 Pavement response modelling based on the theory of linear elasticity was introduced in South Africa in the late 1960's and early 1970's. Since that time, continuous developments took place, and today it is possible to determine the stress / ... Read more
Learning potential, career interest and coping profile of a group of SOF candidates

Author: Van Heerden, Adelai ; De Beer, Morris Date: Sep 2015 The aim of this mixed method study was to obtain a general profile of candidates (N=251) applying to join the Operational Forces of the South African National Defence Force in terms of their coping (hardiness, sense of coherence, locus of ... Read more
Limestone neutralisation of arsenic-rich effluent from a gold mine

Author: De Beer, Morris ; Mathews, EH ; Krueger, D ; Maree, J ; Mbhele, FN ; Phalanndwa, M ; Novhe, NO Date: Mar 2008 Traditionally acid mine water is neutralised with lime. Limestone is a cheaper alternative for such applications. A case study showed that limestone can be used effectively to replace lime for the neutralization of arsenic rich acid water. ... Read more
Load equivalency factors (LEFs) for abnormal vehicles (AVs) and mobile cranes in South Africa based on the mechanistic-empirical (M-E) design methodology

Author: De Beer, Morris ; Sallie, Ismail M ; Van Rensburg, Yvette ; Kemp, Mauritz J Date: Jul 2009 This paper describes the proposed new methodology for the determination of the Permit Mass Fees for Abnormal road Vehicles (AVs) based on the estimation of road damage. The existing South African mechanistic-empirical (M-E) pavement design ... Read more
Mechanistic design optimisation of thin asphalt surfacings using measured non-uniform tyre-road contact and incorporating rectangular contact shapes and layer cross-anisotropy

Author: De Beer, Morris ; Maina, J ; Van Rensburg, Yvette ; Fisher, Colin Date: May 2018 Mechanistic design and construction of flexible pavements with relatively thin (< 50 mm) asphalt road surfacings still remain an art today and are aimed especially towards first-class user experiences. Risks for surfacing failures are difficult ... Read more
Mechanistic modelling of weak interlayers in flexible and semi-flexible road pavements: Part 2

Author: De Beer, Morris ; Maina, JW ; Netterberg, F Date: Apr 2012 This paper (Part 2 of a two-part set of papers) discusses models and illustrates the adverse effects of weak layers, interlayers, laminations and/or weak interfaces in flexible and semi-flexible pavements, also incorporating lightly cemented ... Read more
Modelling tyre-road contact stresses in pavement design and analysis

Author: Maina, JW ; De Beer, Morris ; Van Rensburg, Yvette Date: Jul 2013 Growing traffic volumes, increasing construction and maintenance costs continually drive for more innovative approaches and methodologies towards sustainable road infrastructure. At the current price levels of around R6000 per metric tonne, ... Read more
Neutralization and attenuation of metal species in acid mine drainage and mine leachates using magnesite: a batch experimental approach

Author: Masindi, Vhahangwele ; Gitari, WM ; Tutu, H ; De Beer, Morris ; Nekhwevha, N Date: Aug 2014 This paper evaluates the potential application of amorphous magnesite for remediation of Acid Mine Drainage (AMD). Magnesite was mixed with simulated AMD at specific S/L ratios and agitated in an orbital shaker and its capacity to remove ... Read more
Overview of the South African mechanistic pavement design analysis method

Author: Theyse, HL ; De Beer, Morris ; Rust, FC Date: 1996 A historical overview of the South African mechanistic pavement design method, from its development in the early 1970s to the present, is presented. Material characterization, structural analysis, and pavement life prediction are discussed, ... Read more

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