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Literature study
As mentioned previously, there is no specific literature available on the subject of transporting asphalt in Southern Africa. Although there is some similarities in for instance transportation problems of say for instance building materials being delivered to a specific site, it is not the same situation.
The main difference lies in the fact that the asphalt should be seen as the crucial element in a production series, due to the “perishable” nature of hot mixed asphalt. The asphalt should arrive on site at the correct workable temperature and at the correct rate of delivery to suit a specific project. This contrasts sharply with for instance building sand. Furthermore, there might be some time limits imposed on the validity of a specific mix as in a bitumen-rubber blend within which it must be used.
Most other building materials will arrive on site and be stored and be used in a process within the next working day or two, with the exception of ready-mixed concrete.
Asphalt has to be on site on a “just-in-time” basis. If the asphalt arrives too early, it will lead to ineffective utilization of the fleet, and the asphalt being below temperature when the paving process is due to start. If the asphalt arrives at the site too late, or too slow a ratio, there will also be an ineffective utilization of the fleet.
Not only is the time that the asphalt arrives on site critical, but also the rate that the rest of the vehicles arrive on site. If there is an inconsistent flow of material, there will be more stop-start cycles for the paver, resulting in more joints and a paver surface with more undulations.
- CHAPTER 1 – THE PROBLEM AND IT’S SETTING:
- 1.1 The Milieu of the Problem
- 1.2 The importance of the Study
- 1.3 The main problem statement
- 1.4 The sub problems
- 1.5 The hypotheses
- 1.6 The delimitations
- 1.7 The definition of the terms
- 1.8 The assumptions
- 1.9 The importance of the study
- CHAPTER 2 – THE REVIEW OF RELATED LITERATURE
- 2.1 Relationship to theory
- 2.2 Literature study
- 2.3 Findings: Relationship to literature
- CHAPTER 3 – THE DATA
- 3.1 Introduction
- 3.2 The data
- 3.3 Data analysis strategies
- 3.4 Presentation of the results
- 3.5 Methods of achieving trustworthiness
- 3.6 Summary
- CHAPTER 4 – THE SCOPE OF THE WORKS
- 4.1 The project: N3 Old Barn
- 4.2 The project source data
- 4.3 The loading and ordering of material
- 4.4 The weighbridge ticket
- 4.5 The procedure for ordering asphalt
- 4.6 The daily log sheet
- 4.7 The daily data sheet
- CHAPTER 5 – ANALYSIS OF TYPICAL DAILY TRENDS
- 5.1 Introduction
- 5.2 Examination of daily data sheet: 4 May 2002
- 5.3 Analysis of a day with a high production rate
- 5.4 Analysis when there is a paver breakdown
- 5.5 Analysis when working on an intersection
- 5.6 Analysis when a trial section is being done
- CHAPTER 6 – TIME STUDY
- 6.1 Introduction
- 6.2 Time study done on 30 April 2002
- 6.3 Findings from time study
- CHAPTER 7 – FORMULA FOR VEHICLES CALCULATION
- 7.1 Formula for the amount of vehicles required
- CHAPTER 8 – CONCLUSION AND FINDINGS
- 8.1 Introduction
- 8.2 The results in relationship to the hypotheses
- 8.3 Summary and closing comments
- CHAPTER 9 – POSSIBILITIES FOR FUTURE RESEARCH
- 9.1 Future research
- BIBLIOGRAPHY
