M.Com. (Mineral Economics) / South Africa support is one of the world's fastest growing populations. By the year 2000 AD, South Africa's population is predicted to be 225% larger than it was in 1970. By 2000 AD the total population will have grown to over 54 million people, representing a compound growth rate of some 2,7% Per annum over the preceding 30 years. How will this hlrgeoning population be housed? Where will the growth be? It has been predicted, from numerous sources, that the non-European urban population will soar and thereby account for the bulk of the forecast growth. 'Ibis group will grow from 6 million in 1970 to 25 million by the year 2000, a rate of 4,9% Per annum, Whereas, the urban European population growth shall be :relatively static. Clearly, this phase of mass-urbanization will have to be accompanied by general socio-economic upliftment of the community as a whole. In this regard, the demand for housing, particularly low cost housing, will rise sharply. In South Africa today, many a prospectiive entrepreneur has identified this situation as an opportunity to establish a building-materials manufacturing plant. Because a brickworks is commonly believed to be a relatively simple operation to ,establish and run profitably, many entrepreneurs have applied their resources to this field. In reality, a small scale operation is found to be barely profitable and financial failure in this regard is relatively common. 'Ibis dissertation investigates why such a paradox should exist. A host of variables, which can become major pitfalls to a fledgling brick making business, are discussed. Possible hurdles facing such an operation range from raw material properties, the plant's . financial structure, to characteristics of the brick market be understanding of the interactions between these relatively complex facets of brick making, requires a multi-disciplinary approach. The discipline of Mineral Economics is ideally suited to address the range of problems facing the entrepreneurs, who attempt to establish a small brick plant.

The main purpose of the study is to determine strategies for retaining valuable current customers and acquiring attractive new customers for Corobrik; therefore, the problem to be investigated is the reason for Corobrik’s inability to gain significant market share in the brick market over the last five years. Although there has been tremendous growth in the building industry, Corobrik has not been able to fully capitalise on the situation despite increasing its own capacity. A competitive-strength evaluation will form the basis of this study in order to determine customer preferences, as well as competitor performance relating to these preferences. The study will be limited to the Gauteng Province owing to the enormous number of customers in South Africa as well as to time constraints. The market in Gauteng is substantial enough to yield a fair representation of what is to be achieved with the study. A questionnaire will be distributed to Architects, Contractors and Distributors, which represent the different market segments, and the data will be collected by means of telephonic interviews. McDonald & Dunbar (2004) expounded on a method of competitive-strength evaluation, entailing a method of understanding the customers’ preferences and understanding their views of competitor performance in relation to the customers' own preferences. Based on this method, a questionnaire was drafted which will be distributed to role players in the market in order to collect the required data. This research study can be seen as exploratory, since future research tasks could be discovered during the study. This study will be a ‘snapshot in time’ because of time constraints, and could possibly yield different results if repeated at any other time. The questionnaire is such that the data could be analysed and certain propositions could be compared with the ratings. Therefore, a semi-quantitative study is possible, i.e. people’s perceptions can be measured. It is important that the study be done in a ‘field setting’ to reflect what would occur under actual conditions. In addition, exactly the same questionnaire was used for all respondents, minimising the possibility of the respondents or the researcher manipulating the ratings reflected in the survey. The main findings revealed that sales to Distributors and Contractors constitute approximately 85 per cent of the total product sales of Corobrik and that Distributors and Contractors perceived Corobrik as expensive, Price being rated as their most important DBC. Architects rated Quality and Aesthetics as the most important DBCs and they rated Corobrik the best performer in these categories. This finding implies that Corobrik manages to satisfy Architects’ most important needs; however, Price was also Corobrik’s worst performing DBC in terms of the Architect ratings. Corobrik does satisfy the needs of Architects fairly well; however, this study was limited to the brick industry and did not attempt to compare face bricks with rival materials such as glass, aluminium, wood, plaster and paint and others. Consequently, Corobrik’s performance was not compared with that of the manufacturers of these rival products with regard to the relevant DBCs. It is, therefore, recommended that such a study be conducted in order to determine how well Corobrik performs in comparison with the rival companies. In addition, Corobrik should consider a marketing objective of developing new products for existing market segments (Architects), i.e. products that are able to compete with glass, aluminium and other rival materials, or that could even be used to compliment one another. This initiative could lead to increased market share, not only in the brick market but also in the bigger construction market. It appears that Corobrik has to date followed the marketing strategy of supplying existing products to new segments such as the residential market, and the researcher’s impression is that this new segment does not really want the product because of its affordability. Therefore, Corobrik needs to consider developing new products for the relatively new residential market, but with the emphasis on affordability. / Graduate School of Business Leadership / M.B.L.

The main purpose of the study is to determine strategies for retaining valuable current customers and acquiring attractive new customers for Corobrik; therefore, the problem to be investigated is the reason for Corobrik’s inability to gain significant market share in the brick market over the last five years. Although there has been tremendous growth in the building industry, Corobrik has not been able to fully capitalise on the situation despite increasing its own capacity. A competitive-strength evaluation will form the basis of this study in order to determine customer preferences, as well as competitor performance relating to these preferences. The study will be limited to the Gauteng Province owing to the enormous number of customers in South Africa as well as to time constraints. The market in Gauteng is substantial enough to yield a fair representation of what is to be achieved with the study. A questionnaire will be distributed to Architects, Contractors and Distributors, which represent the different market segments, and the data will be collected by means of telephonic interviews. McDonald & Dunbar (2004) expounded on a method of competitive-strength evaluation, entailing a method of understanding the customers’ preferences and understanding their views of competitor performance in relation to the customers' own preferences. Based on this method, a questionnaire was drafted which will be distributed to role players in the market in order to collect the required data. This research study can be seen as exploratory, since future research tasks could be discovered during the study. This study will be a ‘snapshot in time’ because of time constraints, and could possibly yield different results if repeated at any other time. The questionnaire is such that the data could be analysed and certain propositions could be compared with the ratings. Therefore, a semi-quantitative study is possible, i.e. people’s perceptions can be measured. It is important that the study be done in a ‘field setting’ to reflect what would occur under actual conditions. In addition, exactly the same questionnaire was used for all respondents, minimising the possibility of the respondents or the researcher manipulating the ratings reflected in the survey. The main findings revealed that sales to Distributors and Contractors constitute approximately 85 per cent of the total product sales of Corobrik and that Distributors and Contractors perceived Corobrik as expensive, Price being rated as their most important DBC. Architects rated Quality and Aesthetics as the most important DBCs and they rated Corobrik the best performer in these categories. This finding implies that Corobrik manages to satisfy Architects’ most important needs; however, Price was also Corobrik’s worst performing DBC in terms of the Architect ratings. Corobrik does satisfy the needs of Architects fairly well; however, this study was limited to the brick industry and did not attempt to compare face bricks with rival materials such as glass, aluminium, wood, plaster and paint and others. Consequently, Corobrik’s performance was not compared with that of the manufacturers of these rival products with regard to the relevant DBCs. It is, therefore, recommended that such a study be conducted in order to determine how well Corobrik performs in comparison with the rival companies. In addition, Corobrik should consider a marketing objective of developing new products for existing market segments (Architects), i.e. products that are able to compete with glass, aluminium and other rival materials, or that could even be used to compliment one another. This initiative could lead to increased market share, not only in the brick market but also in the bigger construction market. It appears that Corobrik has to date followed the marketing strategy of supplying existing products to new segments such as the residential market, and the researcher’s impression is that this new segment does not really want the product because of its affordability. Therefore, Corobrik needs to consider developing new products for the relatively new residential market, but with the emphasis on affordability. / Graduate School of Business Leadership / M.B.L.

PhD (Sociology) / Department of Sociology

Archaeology consists of many sub-fields, three of which are addressed in this thesis. Historical archaeology, urban archaeology and industrial archaeology are all recent additions to the field. These terms narrow the focus and imply integration of two areas of study. However, in most cases only one portion is emphasized. This relegates the other data source to a supporting role instead of an equal partner. To overcome this the participants in both fields need to understand the methodologies, techniques and values of each discipline to the other. The historical method is a relatively simple technique but one which is virtually ignored by archaeologists. In a similar manner, documents are treated only as information banks when in reality much can be learned from archival material treated as an archaeological artifact. Brickmaking began on southeastern Vancouver Island less than 10 years after Fort Victoria was established. The manufacturing process, consisting of a variety of methods, changed very little over the centuries Development and organization of the industry in the study area paralleled the growth of the region. From simple estate production to nucleated complex, brickmaking rose and fell mirroring the economic state of the area. Ownership of the industry was almost exclusively British even though the yards were operated mainly by Chinese. This relationship is reflected in the larger society. A culture can be viewed as a complex system composed of sub-systems each interacting with each other on various levels. Brickmaking can be viewed as a system from two perspectives. The manufacturing process itself is a closed system yet operation of the industry is closely tied to demand from the larger system of which it is part. Although only one production site remains relatively intact, archaeological investigations of brickmaking are possible at all sites. A well designed research plan is necessary to realize the full potential of the sites and manage the archeological resources.

The focus of the study was two-fold, firstly to determine the effect of age on the capacity of manual materials handling workers and secondly to determine the effect of increasing task mechanisation on the workers’ responses to task demands. The first component of this study, namely Part I, 101 male and 12 female ‘unskilled’ manual workers – of various ages – from a brick manufacturing industry were assessed. Anthropometric, health and strength factors were measured to improve the understanding of the South African manual worker capacity and more specifically, the effect of age on this capacity. Data collection was done between 7.30am and 9.30am in a laboratory-type setting on-site. Anthropometric characteristics (including body mass index, waist to hip ratio, waist circumference and body fat percentage) provided information on the state of obesity and the impact of age in the South African context. Linked to this, the health factors (including blood pressure, resting heart rate and a self-reported questionnaire) provide an extra snapshot of the disease profile in South Africa, and could potentially influence other capacity factors. Isometric strength capacities (of eight different areas, namely: back, leg, bicep, shoulder, pinch, pinch and pull) demonstrated whether South African manual workers show the same decline in strength with aging as seen in industrially advanced countries. The second component of the study, Part II, was performed in situ and measured the workers’ responses to task demands of three brick palletising tasks, one manual (n=21) and two with increasing mechanisation (n=12 each). Spinal kinematics, joint forces and working heart rate were assessed on normal work days during a 30-lift duration and body discomfort measures were taken at the start, middle and end of the work-shift. Spinal kinematics were measured dynamically using a lumbar motion monitor, whereas the spinal forces were estimated using the three dimensional static strength prediction program. The worker capacity results showed that waist to hip ratio, waist circumference and body fat percentage increased significantly with aging, whereas body mass index was not affected by age. All body morphology values were within ‘normal’ ranges. Although diastolic blood pressure increased significantly with age, systolic was not affected significantly by age. Both groups, however, showed an increasing prevalence of hypertension with aging. There were no significant changes in resting heart rate with aging, with a range of 66 bt.min⁻¹ to 74.86 bt.min⁻¹, therefore within normal ranges. Of the strength factors, age only affected shoulder and push strength significantly: Showing a decrease in shoulder strength from 49.89 kgF to 39.91 kgF in the men aged 20-29 to the 50-59 respectively and an increase in push strength from men aged 30-39 and 40-49 to those aged 50-59. Part II results revealed highly frequent lift rates and large degrees of sagittal flexion and lateral bending in all three tasks. These postures adopted for long durations are likely to lead to the development of musculoskeletal disorders. Heart rates of workers from the three tasks were significantly different and heart rates for two tasks were above the recommended 110 bt.min⁻¹. Similarly the body discomfort ratings of the three tasks differed, although a common trend was seen in that lower back pain was the most commonly reported area of discomfort in all tasks. South African manual materials handling males did not show the same responses to aging as men from industrially advanced countries, calling for further research into these differences. Due to the high risks of the three tasks assessed, future research and interventions are required to reduce the risk of injury in the assessed tasks.

MESMEG / Department of Mining and Environmental Geology / Although clay brick manufacturing has been going on for many years in South Africa, informal small-scale clay brick manufacturing enterprises are not officially regulated. Consequently, informal brick makers in the study area do not adhere to the demanding requirements of the South African National Standards for burnt clay masonry. Therefore, their clay bricks lack uniformity in terms of quality. Preliminary work revealed that over time, buildings constructed with these bricks develop cracks, thereby compromising safety. The importance of product quality management is not well understood in the informal brick manufacturing enterprises. As a result, they do not have any product quality management guidelines. The main purpose of this research was to develop the product quality management guidelines for ensuring quality in small-scale brick making enterprises in Dididi area. The specific objectives were to characterize the raw materials for clay brick manufacturing, identify and assess the technical problems of clay brick production, analyse the process of clay brick production and determine areas where product quality improvement is warranted. The research involved fieldwork which included soil sampling, analysis of clay brick production through the use of questionnaires and onsite observation of the production process, collection of samples of burnt bricks which were examined for compressive strength, water absorption as well as dimension measurements. These were then compared with the prescribed quality standards. Laboratory analyses of samples of raw materials were conducted and these included sieve analysis which was conducted in order to establish the particle size distribution of the raw materials; Atterberg limit tests were conducted in order to establish the physical characteristics of the soil. Chemical and mineralogical analyses were carried out to determine the chemical and mineralogical composition of the soil using XRF and XRD respectively. The textural characterisation of the material revealed abundance of sand sized particles and significantly low amounts of clay and silt. The plasticity of the soil used for bricks manufacturing in the study area was found to be ranging from slight to medium plasticity. Chemical analysis showed elevated silica contents with minor amounts of alumina and iron oxide. XRD analysis revealed the dominance of non-clay minerals with the highest concentration of quartz. The average compressive strengths of the tested brick samples for site A was 3.8, and 2.9 and 3.8 MPa for sites B and C respectively. The water absorption of the bricks was 13.5, 15.0 and 16.1% for samples from Site A, B and C respectively. The bricks dimensions met the recommended standards although their sizes were not uniform. v The survey conducted on brick manufacturing process revealed that the technical inefficiencies were mostly influenced by human and mechanical factors as well as the material inappropriateness. The production process was found to be too manual and labour intensive. Selection of the raw materials for brick manufacturing was based on indigenous knowledge and experience and most of the brick manufacturers lacked the prerequisite experience for making quality bricks. On the basis of the results of this research, it can be concluded that the materials used for manufacturing of clay bricks in Dididi are not well suited for making good quality bricks due to the reduced plasticity of the soil and the high concentration of quartz. These render the bricks brittle. It was also concluded that the production process also contributes to the poor quality of the bricks as the nature of the process was too manual. Selection of materials based merely on knowledge and experience and no scientific tests resulted in selection of inadequate materials which in turn affect the quality of the final bricks. It is therefore recommended that plastic clays be added to the raw clay materials to enhance its moulding property. In addition, materials such as internal fuels and anti-shrinkage materials should be incorporated into the process cycle to prevent cracking during drying and firing. Based on the findings of the analysis of the production process, it is recommended that mechanized techniques be employed in the operation and awareness training conducted to improve the understanding and skills of the brick manufacturers and to ensure production of good quality bricks. / NRF