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Browsing by Author "Komba, Julius J"

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Advanced and automated laser-based technique to evaluate aggregates

Author: Anochie-Boateng, Joseph ; Komba, Julius J ; Mvelase, Gculisile M Date: Nov 2011 The Council for Scientific and Industrial Research (CSIR) is undertaking a research project to investigate the use of laser-based scanning technology to quantify the morphological/shape properties (i.e., form - flatness, elongation and ... Read more
Aggregate surface areas quantified through laser measurements for South African asphalt mixtures

Author: Anochie-Boateng, Joseph ; Komba, Julius J ; Tutumluer, E Date: Feb 2012 For several decades, efforts have been made by engineers and researchers in the road and airfield pavements, and railroads to develop methods/procedures for accurate quantification of aggregate shape and packing properties. The difficult part ... Read more
Analytical and laser scanning techniques to determine shape properties of aggregates used in pavements

Author: Komba, Julius J Date: Jun 2013 The work presented in this dissertation contributes to the current innovative research at the Council for Scientific and Industrial Research (CSIR) in South Africa, to automate the measurement of aggregate shape properties. The CSIR’s present ... Read more
Analytical and laser scanning techniques to determine shape properties of mineral aggregates

Author: Komba, Julius J ; Anochie-Boateng, Joseph ; Steyn, WJvdM Date: Jan 2013 The fundamental shape attributes of aggregates used in pavements i.e., form, angularity, and surface texture have not been accurately quantified historically, because of their irregular and non-ideal shapes. This paper presents selected results ... 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
Assessment of the quality of test results from selected civil engineering material testing laboratories in Tanzania

Author: Mbawala, SJ ; Komba, Julius J Date: Dec 2017 Civil and geotechnical engineering material testing laboratories are expected to produce accurate and reliable test results. However, the ability of laboratories to produce accurate and reliable test results depends on many factors, among ... Read more
Assessment of traffic data for road rehabilitation design: A case study of the Korogwe-Mombo road section in Tanzania

Author: Komba, Julius J ; Mataka, M ; Malisa, JT ; Walubita, LF ; Maina, JW Date: Jun 2018 Traffic loading is one of key inputs for new and rehabilitation designs of pavement. Heavy vehicles cause the most structural damage to pavements; hence, as part of the pavement design process, heavy vehicle volume, and axle load surveys are ... Read more
Comparative assessment of the interlayer shear-bond strength ofgeogrid reinforcements in hot-mix asphalt

Author: Walubita, LF ; Nyamuhokya, TP ; Komba, Julius J ; Tanvir, HA ; Souliman, MI ; Naik, B Date: Dec 2018 With the increasing use of geogrid reinforcements to mitigate reflective cracking in hot-mix asphalt (HMA) overlays, interlayer (interface) bonding has become an even more critical aspect of HMA placement/construction to mitigate delamination ... 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
Contiguous aggregate packing as common principle for benchmarking asphalt density, stiffness and permeability control

Author: Horak, E ; Komba, Julius J ; Maina, J ; Sebaaly, H ; Muller, J Date: Mar 2022 Contiguous aggregates are aggregate sizes that consecutively follow a typical aggregate grading curve. Porosity calculation is possible for a binary or longer ranges of contiguous aggregates. Porosity is a fundamental density indicator and ... Read more
Correlating the asphalt-binder high-temperature properties (DSR) to HMA permanent deformation (RLPD) and field rutting: A laboratory-field study

Author: Walubita, LF ; Mahmoud, E ; Fuentes, L ; Prakoso, A ; Lee, SI ; Souliman, M ; Komba, Julius J Date: Nov 2020 Asphalt-binders are part of the key material constituents affecting the performance of hot-mix asphalt (HMA), and ultimately, the field performance of flexible pavement structures. Quite often, it is desired/useful to predict the HMA permanent ... Read more
Correlating the asphalt-binder MSCR test results to the HMA HWTT and field rutting performance

Author: Walubita, LF ; Ling, M ; Fuentes, L ; Komba, Julius J ; Mabrouk, GM Date: Sep 2022 Asphalt binder is one of the key constitutive components of hot-mix asphalt (HMA) that considerably affects its rutting performance. In particular, the high-temperature rheological properties measured from the multiple stress creep and recovery ... Read more
Correlating the HWTT laboratory test data to field rutting performance of in-service highway sections

Author: Walubita, LF ; Fuentes, L ; Prakoso, A ; Pianeta, LM ; Komba, Julius J ; Naik, B Date: Mar 2020 Rutting is one of the common distresses occurring in hot-mix asphalt (HMA) pavements that can be mitigated through adequate laboratory testing during the HMA mix-design screening stage. The Hamburg Wheel Tracking Tester (HWTT) is one of the ... Read more
Crushing damage estimation for pavement with lightly cementitious bases

Author: De Beer, Morris ; Van Rensburg, Yvette ; Komba, Julius J Date: Jul 2014 Crushing (or compression) failure and associated surface deformation of lightly cementitious (stabilised) materials used for base/sub-base course layers in pavements has been well established in the South African pavement design practice since ... Read more
Design and construction of sustainable climate resilient rural access road infrastructures

Author: Komba, Julius J ; Langa, R ; Paige-Green, P ; Verhaeghe, Benoit MJA ; Mokoena, Refiloe Date: Dec 2021 The chapter is organized and structured as follows; the introduction section is followed by an overview of climate change-related challenges affecting Mozambique. The study methodology (approach) is then described, followed by a discussion ... Read more
Distribution of air voids in compacted Hot-Mix Asphalt samples – laboratory vs field

Author: Komba, Julius J ; Maina, JM ; Horak, E ; Steyn, WJ ; O’Connell, Johannes S Date: Oct 2019 The research work presented in this paper investigated the spatial distribution of air voids in compacted Hot-Mix Asphalt (HMA) core samples under different compaction levels and layer/briquette thicknesses. A medium-graded HMA mix was used ... Read more
Effect of sample geometry on bulk relative density of hot-mix asphalt mixes

Author: Anochie-Boateng, Joseph ; Komba, Julius J ; Ventura, D ; Verhaeghe, Benoit MJA Date: Sep 2011 This study emanated from the revision of South African mechanistic-empirical pavement design method. At the CSIR road pavement laboratory, the bulk relative density (BRD) of compacted hot-mix asphalt (HMA) mixes is determined on cores and ... Read more
Evaluation of 3D laser device for characterizing shape and surface properties of aggregates used in pavements

Author: Anochie-Boateng, Joseph ; Komba, Julius J ; Makulenga, N ; Maharaj, A Date: Aug 2010 A new three-dimensional (3D) laser scanning device has been acquired by CSIR Built Environment to determine rock aggregates shape and surface properties. The overall objective is to employ laser-based techniques to accurately determine ... Read more
Evaluation of selected effects of pavement riding quality on logistics costs in South Africa

Author: Steyn, WJvdM ; Bean, W ; King, D ; Komba, Julius J Date: Dec 2011 The efficient operation of a country’s economy depends, among other things, on an efficient logistical system to ensure that goods can be transported efficiently between producers and users. The costs of logistics include aspects such as ... 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

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