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Browsing by Author "Mturi, George AJ"

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African case studies: Developing pavement temperature maps for performance-graded asphalt bitumen selection

Author: Mokoena, Refiloe ; Mturi, George AJ ; Maritz, Johan ; Mateyisi, Mohau ; Klein, Pieter Date: Jan 2022 The reliable performance of roads is crucial for service delivery, and it is a catalyst for domestic and cross-border spatial development. Paved national roads are expected to carry higher traffic volumes over time as a result of urbanization ... Read more
Analytical techniques to quantify modifiers in bitumen for the South African asphalt pavement industry

Author: Makhari, A ; Hawes, Nomashaka BN ; Mturi, George AJ ; Ojijo, Vincent O Date: Jul 2021 Modifying bitumen is currently a common practice in South Africa. The asphalt pavement industry has seen an increase in use of different types of modifiers in an attempt to improve or extend the properties of bitumen. Common modifiers used ... Read more
A benchmarking study of anionic bitumen emulsion properties for slurry seals

Author: Hawes, Nomashaka BN ; Johannes, PT ; Hlangothi, P ; Mturi, George AJ Date: Oct 2019 Bitumen emulsions are the most commonly used bituminous products for roads in Southern Africa because they are relatively inexpensive to apply, in comparison with hot bituminous binders. Although there have been great strides taken in the ... Read more
Correlation of extensional bitumen properties with 4-point bending beam asphalt mixture fatigue life

Author: Maluke, N ; Mturi, George AJ ; Hesp, SAM Date: Oct 2018 In South Africa, over the last two decades, there has been a need to improve on the ductility specification test and to better simulate ageing of the asphalt bitumen in the laboratory for the control of fatigue cracking distress. Focusing on ... 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
Current developments in performance testing of bituminous emulsions used in chip seals

Author: Johannes, PT ; Bahia, HU ; Mturi, George AJ Date: Aug 2015 The use of bitumen emulsions in surface treatments has become prevalent due to advancements in emulsifier development, formulation techniques, and design of surface treatments. However, current practice for testing and selecting emulsion ... Read more
Elongational rheology of bitumen film samples as a fingerprinting technique

Author: Nkuna, A ; Abreu, J ; Mturi, George AJ Date: Oct 2019 The development of improved test methods for modified bituminous binders is currently being pursued at the Council for Scientific and Industrial Research (CSIR). The ductility test laid the initial ground work for all extensional testing of ... Read more
Evaluation of the suitability of the automated mixing test in determining the workability of slurry surfacing mixes

Author: Johannes, PT ; Bahia, HU ; Mturi, George AJ Date: Oct 2019 Slurry seals and micro-surfacing systems are widely used as primary surface treatments for extending pavement life and restoring the serviceability function of structurally adequate pavements. Beside their prevalent use, current test methods ... Read more
Fluxing as a new tool for bitumen rheological characterization and the use of time-concentration shift factor (ac)

Author: Zoorob, SE ; Mturi, George AJ ; Sangiorgi, C ; Dinis-Almeida, M ; Habib, NZ Date: Jan 2018 he concept of temperature shift factor (aT) as defined by Doolittle, relating the free volume of a viscoelastic material at the current and reference states is briefly examined together with the resultant William-Landel-Ferry equation. This ... Read more
Force ductility: a 5 year feedback of performance results

Author: Mturi, George AJ ; Nkgapele, M Date: Jul 2013 The development of improved test protocols and procedures for modified bituminous binder materials is currently been pursued by the Council for Scientific and Industrial Research (CSIR). The determination of the cohesive strength of modified ... 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
Investigating the use of isothermal calorimetry for predicting physical properties of cements

Author: Mokoena, Refiloe ; Motau, T ; Mturi, George AJ Date: Sep 2021 Isothermal calorimetry is a useful technique for studying the cement hydration process that measures the heat flow of cement paste during hydration. Standard cement properties, such as compressive strength, setting times and compatibility can ... 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
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
The use of plastic waste in road construction

Author: Mturi, George AJ ; O’Connell, Johan S ; Akhalwaya, Imraan ; Ojijo, Vincent O ; Mofokeng, Tladi G ; Ncolosi, Nonzwakazi ; Smit, Michelle A Date: Dec 2021 Recycled plastics are being investigated worldwide not only as a green investment, but also for improved pavement durability (Milad et al., 2020). The objectives of the study were to screen, evaluate and implement existing international ... Read more

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