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Browsing Journal Articles by Author "De Beer, Morris"

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Analytical approach for predicting three-dimensional tire-pavement contact load

Author: Hernandez, JA ; Gamez, A ; Al-Qadi, IL ; De Beer, Morris Date: Dec 2014 Three-dimensional tire–pavement contact loads of two truck tires—a new-generation wide-base tire (WBT) and a dual tire assembly (DTA)—were measured and analyzed. Extreme and typical values of tire inflation pressure (552, 690, 758, and 862 ... Read more
Complete sulphate removal from neutralised acidic mine drainage with barium carbonate

Author: Swanepoel, H ; De Beer, Morris ; Liebenberg, L Date: Mar 2012 The most widespread method used for the treatment of acidic mine drainage (AMD) is neutralisation through the addition of lime to the effluent in order to raise the pH. As a result, dissolvedmetals precipitate as metal hydroxides while partial ... Read more
Conversion of calcium sulphide to calcium carbonate during the process of recovery of elemental sulphur from gypsum waste

Author: De Beer, Morris ; Maree, JP ; Liebenberg, L ; Doucet, FJ Date: Nov 2014 The production of elemental sulphur and calcium carbonate (CaCO(sub3)) from gypsum waste can be achieved by thermally reducing the waste into calcium sulphide (CaS), which is then subjected to a direct aqueous carbonation step for the generation ... Read more
Efficiency of ball milled South African bentonite clay for remediation of acid mine drainage

Author: Masindi, Vhahangwele ; Gitari, MW ; Tutu, H ; De Beer, Morris Date: Dec 2015 The feasibility of using vibratory ball milled South African bentonite clay for neutralization and attenuation of inorganic contaminants from acidic and metalliferous mine effluents has been evaluated. Treatment of acid mine drainage (AMD) ... Read more
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
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
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
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
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
The psychological coping, learning potential and career preferences profiles of operational force military candidates

Author: De Beer, Morris ; Van Heerden, Adelai Date: 2017 The aim of this study was to profile the psychological coping, learning potential and career-related interests of 251 candidates for operational force military selection for the South African National Defence Force (SANDF) – 26 of whom were ... Read more
Removal of boron from aqueous solution using magnesite and bentonite clay composite

Author: Masindi, Vhahangwele ; Gitari, MW ; Tutu, H ; De Beer, Morris Date: Mar 2015 The removal of boron from industrial effluents using the composite was studied in batch equilibration technique. The effects of equilibration time, adsorbent dosage, concentration and pH on removal of boron were investigated. The experiments ... Read more
Stress-In-Motion (SIM) system for capturing tri-axial tyre-road interaction in the contact patch

Author: De Beer, Morris ; Fisher, C Date: Aug 2013 A unique measuring system for the quantification of tri-axial (3-D) tyre contact force (or stress) distributions was designed, developed and used in several studies since 1994. The uniqueness of the system is defined by a textured measuring ... Read more
A study of crumb rubber modified bitumen used in South Africa

Author: Mturi, George AJ ; O'Connell, Johannes S ; Zoorob, SE ; De Beer, Morris Date: May 2014 In South Africa, an empirical characterisation of crumb rubber modified (CRM) bituminous binders has historically been the only means of predicting their performance in pavement layers, short of constructing pavement test sections. An improved ... Read more
Synthesis of cryptocrystalline magnesite–bentonite clay composite and its application for neutralization and attenuation of inorganic contaminants in acidic and metalliferous mine drainage

Author: Masindi, Vhahangwele ; Gitari, MW ; Tutu, H ; De Beer, Morris Date: Dec 2015 The primary aim of this study was to synthesize cryptocrystalline magnesite–bentonite clay composite by mechanochemical activation and evaluate its usability as low cost adsorbent for neutralization and attenuation of inorganic contaminants ... Read more
Synthesis of high-purity precipitated calcium carbonate during the process of recovery of elemental sulphur from gypsum waste

Author: De Beer, Morris ; Doucet, FJ ; Maree, JP ; Liebenberg, L Date: Aug 2015 We recently showed that the production of elemental sulphur and calcium carbonate (CaCO3) from gypsum waste by thermally reducing the waste into calcium sulphide (CaS) followed by its direct aqueous carbonation yielded low-grade carbonate ... Read more
Toward using tire-road contact stresses in pavement design and analysis

Author: De Beer, Morris ; Maina, JW ; Van Rensburg, Yvette ; Greben, JM Date: Oct 2012 Optimization of road pavement design, especially towards the surface of the pavement, requires a more rational approach to modeling of truck tire-road contact stresses. Various road surfacing failures are given in this paper as examples, and ... Read more
Towards Understanding Tyre-Pavement Contact in APT Research on Flexible Pavements

Author: De Beer, Morris ; Fisher, Colin Date: Sep 2016 An important element of Accelerated Pavement Testing (APT) is the selection of appropriate test tyre(s) to be used for APT testing. By far the majority of full scale (or scaled) APT devices uses pneumatic rubber tyres. Tyres differ not only ... Read more
Treatment of acid and sulphate-rich effluents in an integrated biological/chemical process

Author: Maree, JP ; Greben, HA ; De Beer, Morris Date: Apr 2004 A novel chemical/biological process is described in which sulphate and sulphide are removed simultaneously during biological treatment. Partial sulphate removal is achieved during chemical pre-treatment. In the biological stage sulphate is ... Read more
Using tire road contact stresses in road pavement design and analysis

Author: De Beer, Morris ; Maina, JW Date: 2011 Simple tire-pavement contact analysis reveals that higher contact stresses from truck tires could result in increased potential for road pavement failures. Read more

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