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Browsing by Author "O'Connell, Johannes S"

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Adapting asphalt pavements to climate change challenges

Author: Mokoena, Refiloe ; Mturi, Georges AJ ; Maritz, Johan ; Malherbe, Johan ; O'Connell, Johannes S Date: Oct 2019 Performance grade specifications for bituminous binders focus on the evaluation of bitumen properties based on the loading and environmental conditions under which the material will be subjected to in the field. The temperature of the asphalt ... Read more
Analytical modelling of visco-elastic behaviour of hot-mix asphalt

Author: Komba, Julius J ; Maina, JW ; Anochie-Boateng, Joseph ; O'Connell, Johannes S Date: Jul 2012 As part of the revision of the South African Pavement Design Method (SAPDM), laboratory testing was conducted to obtain the dynamic (Complex) modulus |E*| of hot-mix asphalt (HMA) samples. Dynamic modulus gives an indication of linear ... Read more
Comparative evaluation of an experimental binder in hot-mix asphalt: correlating the predicted performance of the binder with asphalt testing

Author: O'Connell, Johannes S ; Komba, Julius J ; Louw, JG Date: Jul 2014 The binder is an important constituent of an asphalt mix and it affects the overall performance of the mix, especially with regards to permanent deformation and fatigue cracking. The stiffest binder available from the Chevron refinery in the ... Read more
Creep recovery behaviour of bituminous binders - relevance to permanent deformation of asphalt pavements

Author: Mturi, George AJ ; Nkgapele, M ; O'Connell, Johannes S Date: May 2012 The increase in traffic loads and loading time in road pavements worldwide has resulted in the widespread usage of polymer modified binders (PMBs) since they offer increased resistance to pavement distresses. The extensive use of inherently ... Read more
Difficulties monitoring short-term ageing in thin surfacing layers using asphalt concrete

Author: O'Connell, Johannes S ; VdM Steyn, WJ ; Maina, J Date: Dec 2024 Ageing has a profound effect on pavement performance, especially regarding cracking. Due to budgetary constraints, South Africa has pioneered the use of thin asphalt concrete layers. The research described in this paper is based on a short-term ... Read more
Evaluating the efficacy of laboratory ageing of asphalt mix binders as a prediction for field ageing

Author: O'Connell, Johannes S ; Maina, J ; Bredenhann, SJ ; Marais, H ; Komba, J Date: Oct 2023 A Performance-grade Binder Specification (SATS 3208) for South Africa was finalised after CAPSA 2015 and launched at CAPSA 2019. A key feature of the performance-graded binder specification is the regulation of binder performance after long-term ... Read more
Evaluation of bitumen-rubber asphalt manufactured from modified binder at lower viscosity

Author: O'Connell, Johannes S ; Anochie-Boateng, Joseph ; Marais, H Date: Aug 2010 In South Africa, crumb tyre-modified bitumen commnly known as bitumen-rubber binder has viscosity limits specified by the current edition of TG1: The Use of Modified Bituminous Binders in Road Construction. As the crumb rubber is 'digested', ... Read more
Evaluation of the performance of aggregate in hot-mix asphalt

Author: Komba, Julius J ; O'Connell, Johannes S ; Paige-Green, P Date: Jul 2014 The overall performance of an asphalt mix is dependent on, amongst others, the properties of the constituent materials, which include aggregate, binder and filler. The aggregate for production of asphalt mixes is usually sourced from a quarry, ... Read more
Evaluation of the use of polymer modified bitumen in the production of high modulus asphalt for heavily-trafficked roads

Author: Komba, Julius J ; Verhaeghe, Benoit MJA ; O'Connell, Johannes S ; Anochie-Boateng, Joseph ; Nortje, W Date: May 2015 Enrobé à Module Élevé (EME) technology, a High Modulus Asphalt (HiMA), has been introduced to South Africa to provide an optimum solution for the design and construction of heavily trafficked roads. Implementation of EME technology in South ... Read more
Hot-mix asphalt testing for the South African pavement design method

Author: Anochie-Boateng, Joseph ; Denneman, E ; O'Connell, Johannes S ; Mturi, George AJ ; Ventura, D Date: Aug 2010 As part of the revision of the South African Pavement Design Method (SAPDM), a large scale field and laboratory study into the material response of asphalt mixtures will be undertaken. A first step in this process is to review the state-of-the ... Read more
Laser-based approach for determining flakiness index of aggregates used in pavements

Author: Anochie-Boateng, Joseph ; Komba, Julius J ; O'Connell, Johannes S Date: Jul 2011 There are concerns about the standard methods/procedures for quantifying shape properties of rock aggregates used in road and airfield pavements. The CSIR has recently acquired a portable three-dimensional (3D) laser scanning device to address ... Read more
Long-term pavement performance monitoring and the revision of performance criteria for high modulus asphalt in South Africa

Author: Komba, Julius J ; Anochie-Boateng, Joseph ; O'Connell, Johannes S ; Verhaeghe, Benoit MJA Date: Sep 2016 Enrobé à Module Élevé (EME) technology, a High Modulus Asphalt (HiMA), was originally developed in France. The technology is primarily suitable for construction of heavily trafficked routes, airports and container terminals. The key performance ... Read more
Relating the rheology of recovered binders from asphalt surfacing in the field to their fatigue performance

Author: O'Connell, Johannes S ; Maina, J ; Bredenhann, SJ ; Marais, H ; Komba, J Date: Oct 2024 G*.Sind and TC are two of many rheological parameters that have been proposed as potential specification properties for control of fatigue performance for hot mix asphalt. This paper assesses the extent of correlation between the values of ... Read more
Resilient response characterisation of hot-mix asphalt mixes for a new South African pavement design method

Author: Anochie-Boateng, Joseph ; O'Connell, Johannes S ; Denneman, E ; Verhaeghe, Benoit MJA Date: Sep 2011 The South Africa National Road Agency Ltd (SANRAL) is in the process of revising the South African Pavement Design Method (SAPDM). A necessary part of this programme is to develop resilient response models. Dynamic (complex) modulus has been ... Read more
Rheological testing of crumb rubber modified bitumen

Author: Mturi, George AJ ; Zoorob, SE ; O'Connell, Johannes S ; Anochie-Boateng, Joseph ; Maina, J Date: Aug 2011 The development of improved test protocols and procedures for asphalt materials is currently been pursued by the Council for Scientific and Industrial Research (CSIR) to support the revision of the existing South Africa flexible pavement ... Read more
Role of high-level project professionals' perceptions on quality processes in directing the investigation of causes of premature pavement distresses: An exploratory study

Author: Mgangira, Martin B ; Das, Sonali ; O'Connell, Johannes S Date: Jul 2016 Following the observation of physical form of distress that leads to premature failure, investigations are usually initiated in order to identify causes or factors of the observed early pavement distress, which is often due to a combination ... 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

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