RELATIONSHIP OF SUPERPAVE GYRATORY COMPACTION PROPERTIES TO HMA RUTTING BEHAVIOR
This report presents the findings of a research project to examine whether there is a relationship between any property of hot mix asphalt (HMA) measurable with the Superpave gyratory compactor and the rutting behavior of HMA pavements in service. Its main finding is that the parameter N-SRmax, the number of gyrations at maximum stress ratio, may be used within certain limits to identify mix designs likely to show gross instability under the shear stresses produced by traffic in HMA pavements. The report will be of particular interest to materials engineers in state highway agencies, as well as to materials suppliers and paving contractor personnel responsible for HMA design and quality control.
Effect of Lab. Compaction Effort on Evaluation of Modified HMA Specimens
The only way to estimate the future performance of any asphalt pavement is reached through the laboratory test which was made for evaluating its expected lifetime. For that purpose the laboratory compaction considered as the main important factor that influence the expected lifetime of any asphalt pavement. In this study we evaluated the effect of compaction effort on the performance properties of asphalt pavement through examining two compaction methods which are the Marshall hammer compactor and the Superpave gyratory compactor (SGC), that conducted the best method which provides the best simulation of what really happen in the field compaction, through making many of laboratory tests involving the volumetric properties and the performance properties for the both methods. Two types of modifiers were used with two percentages which are polypropylene (1% and 2%) by weight of total mix,  and hydrated lime (1% and 2% ) by weight of the total mix as replacer part of the filler content, and then the results were compared for evaluating the most simulating method to the field compaction for control and modified mixes. The results showed that the Superpave gyratory compactor provide the best simulation to the field compaction compering to the Marshall Compaction method, The mixes compacted by using SGC have lower optimum asphalt content than those prepared by Marshall compaction method by about (1% and 2%) for binder and base course respectively. The volumetric and performance properties of mixes prepared by using the SGC were better than those of mixes prepared by Marshall compaction method. Keywords: Superpave Gyratory Compactor, Marshall Hammer, Indirect Tensile Strength, Tensile Strength Ratio
As práticas profissionais no campo público de atenção à saúde bucal: o caso de dois municípios da Bahia
This paper examines the working facilities and processes of dentists in the primary healthcare systems of two towns in Bahia State, Brazil, striving to analyze the extent to which factors related to dental care, training, placement and professional profiles influence their practices. Semi-structured interviews were conducted with nine dentists in both towns, with work process organization patterns in Municipality C being closer to the structuring principles of Brazil's National Health System than in Municipality E. This seems to be related to management characteristics, with networking links among individual, collective, and preventive clinical activities and planning noted in Municipality C. Despite these differences, the practitioners presented similarities in terms of dual militancy and perceptions of the public and private healthcare fields. The hegemony of the private sector seems to be influencing the professional practices of dentists in the public health system.