Workshops Summary

Speciality Workshop 1: Pavement design and performance: Testing and designing for asphalt fatigue

Workshop Background
Fatigue plays an important role in the performance of a pavement, especially when high loads, both in number and magnitude are considered.  Unfortunately fatigue, as is currently practised, is also a time-consuming during the materials design phase.  For the same reason it is also not a practical parameter to utilise for acceptance and quality control purposes.  Methods are available to relate binder performance testing to asphalt mix performance that are far quicker to perform and is also obtained at lower cost. Will binder testing be enough to control the very important fatigue phenomena?
Workshop focus
The workshop is a speciality session for specialists in the field of asphalt fatigue.  The focus of the workshop will be to discuss different fatigue tests and the time taken for testing during the materials design phase, to evaluate alternative approaches to incorporate fatigue in the asphalt design process, both materials design and pavement design.
Short Presentations as Introduction to Workshop

  • Geoffrey Rowe: Fatigue assessment of conventional and highly modified asphalt materials
  • Andre Molenaar: Fatigue Testing: Unfortunately, a time consuming and costly affair
  • Jo Sias: Overview of Rheological, Fatigue, and Fracture Properties to Evaluate Fatigue and Thermal Cracking of Asphalt Mixtures in Northern US
Workshop 2: Regional and international research: Leadership, cooperation and program development

Workshop Background
Research, research and implementation (RDI) in South Africa, both public and private, is uncoordinated and fragmented. Uncertainty exists regarding the current funders and funding mechanisms, status of RDI programmes and available capacity for undertaking RDI.  There is a need for systems to support and manage coordinated and cooperative RDI addressing rationally identified needs and encompassing:

  • Leadership in technology development
  • Identification and prioritisation of RDI needs
  • Formulation of coordinated and cooperative RDI programmes
  • Management of sustainable deployment of resources (funding, human capital and research infrastructure)
  • Effective technology transfer, embedment and uptake of research outputs/outcomes

Workshop focus
Clarification of the current and medium-term (5 year) situation regarding roads-related research programmes, funding, facilities, human capital and knowledge management.  The Workshop will focus on the following three main aspects:

  • How best to coordinate national RDI activities (programmes and funding)
  • How to re-capacitate and optimally mobilise research resources
  • How to best deal with outputs/outcomes of RDI (guidelines, norms and standards)

Short Presentations as Introduction to Workshop

  • Benoit Verhaeghe:         Current RDI landscape in Southern Africa
  • Chantal Rudman:          Human Capital challenges in RDI
  • Melanie Hofmeyr:          Management of industry documentation: quo vadis
Workshop 3: Asphalt Process Control – Using Digital Technologies to improve construction performance

Workshop Background
Recent advances in construction machinery has seen several new sensors being added to asphalt construction equipment. Digital technologies such GPS, infrared and other sensors, real-time process control and other communication systems enable tracking, visualisation and data mining of key process parameters during asphalt construction such as logistics, temperature homogeneity and compaction consistency. Yet, despite the availability of these technologies, implementation is slow and barriers to technology adoption remain an obstacle. Using the Netherlands as a case, this workshop will address SMART technology implementation for the asphalt construction industry, its benefits, challenges, complications and strategies to make it successful and sustainable.
Workshop focus

  • Addressing variability in the asphalt construction process
  • Digital technologies that will benefit the asphalt construction industry
  • How to implement digital technologies efficiently and effectively
  • How to overcome challenges of implementation, barriers to technology adoption and digitalisation
  • Key organisations to involve in the implementation and sustainable adoption of digital technologies

Short Presentations as Introduction to Workshop

  • Dr. Seirgei Miller: Addressing challenges of variability and construction quality
  • Mahendren Manicum: Digital Technologies – the answer to all our challenges?
  • Dr. Seirgei Miller: First steps to be taken toward a Digital Technology Roadmap
Workshop 4: Selection of Appropriate Seal Types and Binder Combinations

Workshop Background
The primary modes of failure in surfacing seals are early stripping of aggregate and bleeding. These risks can be reduced by appropriate selection of binder and aggregate combinations (seal types), correct design and attention to detail during construction.
Workshop focus
The goal is to find the optimum solutions to produce low-risk, high performance seals. The workshop will focus on:

  • Factors influencing the performance and selection of seal type and binder combinations (low volume, high volume, airports)
  • Exploring practical lessons learnt
  • Improvement in design methods
  • New technologies/products and research to enhance the performance of seals for various applications and environmental conditions.
  • Updating of guidelines/manuals and specifications

Short Presentations as Introduction to Workshop

  • Mr Gerrie van Zyl: Stripping of Seals in Southern Africa: Case Studies and Guidelines for an improved approach to mitigate it
  • Dr Greg White: A Standardised Sprayed Sealing Specification for Australian Airports
  • Prof Gerrit Jordaan: Evaluation of novel winter-seal applications
Workshop 5: Optimal design of Asphalt

Workshop Background
The Asphalt Design Workshop is a follow up of the same workshop held at Capsa’15 where the aim of moving towards performance-based testing and the finalisation of TRH8 which has now been launched.   The new design criteria is already specified in one City and on new Sanral contracts and it is believed that other client bodies will follow.  A RPF Task Group on Manual 35/TRH 8 Implementation has been established that is looking at engaging with all client bodies to ensure broader implementation of the mix design manual.
Workshop Focus
The focus of the workshop will be to engage with industry players on the implementation of the mix design manual and to get feedback on the value of the outputs of the newly adopted performance tests.
Short Presentations as Introduction to Workshop

  • Joanne Muller: Superpave 5.0
  • Wim Hofsink: HWTT – Possible pitfalls
  • Steph Bredenhann: Feedback from asphalt Fatigue workshop
Workshop 6: Research Outcomes for Cost-Effective Provision of Low Volume Sealed Roads

Workshop Background
ReCAP has conducted research into the performance of low volume sealed roads that have been constructed using locally-available materials that do not meet conventional specifications. A project titled ‘Development of specifications for low volume sealed roads through back analysis’ has produced exciting findings that show that these road sections have performed remarkably well over the design period in conditions of high rainfall and, in a number of cases, higher than expected traffic loading. These findings provide promising evidence for cost-effective provision of low volume sealed roads.
Workshop Focus

  • Review of performance data gathered from previous projects and combined with further studies on existing roads in 4 African countries
  • Review complementary findings from another ReCAP study on alternative surfacings for LVR in three West African countries as types of surfacing and their maintenance requirements have a significant bearing on the service life of sealed roads.
  • Discussion of identified performance trends and lessons to be learnt
  • Discussion of study conclusions with respect to specifications for material quality and pavement structures; traffic loading limits for LVSR; and use of thin amalgamated surfacings.
  • Recommendations on fit-for purpose design guidelines for LVSR

Short Presentations as Introduction to Workshop

  • Andrew Otto, Kenneth Mukura: Widening the scope of pavement materials for use in the provision of low volume sealed roads – Outcomes from ReCAP research 
  • Anton Hartman, T Amara, J Reynolds: Alternative surfacings for low volume roads in West Africa
  • Matthew Townsend: Assessment of Cost-Effectiveness of Alternative Surfacings for LVSR using Life-Cycle Costing Analysis
Workshop 7: Bituminous binders testing and standard

Workshop Background
Standards and the testing to ensure that standards are reached and maintained are very important issues. Quite often differences in laboratory testing during construction lead to disputes. To ensure consistent results it is necessary to follow a set of protocols. Laboratory methods also need constant scrutiny to assess appropriateness and to ensure that modern trends and materials are acknowledged and incorporated.
Workshop Focus
The focus of the workshop will be to discuss issues with standards and testing methods. Special emphasis will be put on protocols for testing.
Short Presentations as Introduction to Workshop

  • Estimé Mukandila: Possibility of using a Weatherometer as an aging calibration tool for bitumen binder
  • Elaine Goosen: Extraction and Recovery of Bituminous Binders from Chip Seal Samples
  • Ashiel Rampersad: A proposed national protocol for performing frequency sweeps on bituminous binder
Workshop 8: Innovation in road maintenance techniques and procedures

Workshop Background
The current approach to road maintenance needs a rethink with heavy backlogs evident and the quantum being well known by RSA roads authorities and Political Leaders. There is no easy way to clear this backlog. A new approach could endeavour to arrest this system through the implementation of an asset management-based approach to ensure the efficient use of the funding provided. Road maintenance is currently used as a development tool in creating sustainable contractors (managed contracts, main contractor managing smaller contractors). National Treasury (NT) currently allows terms contracts, so there is no reason why not to engage NT with a proposal to ensure a sustainable and efficient methodology of outsourcing road maintenance.
There is also a question of the length of the contracts, there are so many prospective tenderers who demands higher rotation in order to get their share. The debate is real when it comes to what is a sustainable duration for these contracts.
Workshop Focus

  • Elevation of maintenance in road provision.
  • Procurement regime
  • Different types of road maintenance models by road authorities / international organisations.
  • The standalone management contract where the main contractor does not tender any rates for undertaking the works? Rates discrepancies between main contractor and subcontractors.
  • Client centric (who is our clients).
  • Realise the value proposition presented by the technology applications.
  • Treasury requirement on the procurement and its consequences?

Short Presentations as Introduction to Workshop

  • Douglas Judd: The role of the PPP project in road maintenance
  • Marco Capazario/Ayanda Chagwe: Digitising the entire road maintenance process
  • Ricardo Louw: Term maintenance contracts – an international case study
  • Prasanth Mohan/ W Maphakela: Exploring National Treasury limits
Workshop 9: Recent Advancements in Innovative Bituminous Materials

Workshop Background
The developments in bituminous and other materials used in flexible pavement structures has grown significantly. Advances are linked to innovative materials, evaluation and testing, specialised applications, improved durability and performance. In particular, industry needs are being addressed through the innovation. This workshop focusses on 4 innovative products and technologies that are impacting on pavement performance. Strengths, challenges and barriers, advantages, disadvantages, developmental and implementation issues will be debated for these and other materials. Questions such as “So what?” and “What is needed for a conducive environment for innovation?” will be addressed and discussed. 
Workshop Focus
Workshop Focus

  • High priority needs of industry being addressed through material innovation
  • New technologies that will benefit industry, communities and the environment
  • New and novel ways of evaluation and performance testing
  • How to implement the new technologies efficiently and effectively
  • Key organisations to involve in the implementation

Short Presentations as Introduction to Workshop

  • Prof Wynand Steyn: Evaluation of materials treated with organo-silane (nano) emulsion
  • Bernhard Botes: Fit-for-purpose tack coats
  • Johannes Lambert: High shear, low flow emulsion tack
  • Mafuma Tafadzwa: New crumbed rubber technology