This research combines technical, environmental, and economic aspects regarding the utilization of Bege Bahia marble waste (BB) in clinker production. Three different eco-friendly clinkers were produced, investigated, and compared with one that is commercially available. BB was used to replace 49.2%, 77%, and 80.3% of the limestone by total amount of clinker. Two clinkers were selected to produce cement pastes, and their impact on compressive strength at 28 days was examined. The results suggest that substituting limestone with BB does not adversely affect the compressive strength of cement paste. Moreover, employing 77% or 80.3% BB in clinker production does not significantly influence the alite and belite contents but slightly increases the tricalcium aluminate and ferrite phases while reducing the periclase content. A life cycle analysis was conducted to assess the effects of replacing limestone with marble waste. The results revealed a substantial decrease in abiotic depletion, leading to conservation of substantial natural resources. Consequently, the utilization of BB in clinker production makes a significant contribution to environmental preservation while providing an effective alternative to limestone. In addition, the resulting clinkers serve as useful repositories, providing a permanent and sustainable destination for waste that is currently deposited in landfills. Finally, the economic viability was also examined under various scenarios based on the distance between marble and cement plants. The results highlight the transport distance of marble waste as the primary determinant of economic feasibility in utilizing this residue as a limestone replacement.

Purpose: – The purpose of this paper was to build the MACTAK methodology, which aims to transform collective tacit knowledge into the explicit one using knowledge elicitation techniques, associated to quality tools structured by systemography, represent it in a symbolic language and production rules and model it in two expert systems which can assist the investigation of defect causes during the metal packaging production process. Design/methodology/approach: – The method applied in the research was classified as exploratory, because a preliminary study was conducted, to better suit the mapping methodology for eliciting collective tacit knowledge, to the reality which was intended to be known. Through studies and the application of the systemography technique, a methodology for the elicitation of collective tacit knowledge has been developed. It suggests a systematic sequence of activities, to map and transform collective tacit knowledge into the explicit one, on the production process which was studied. Findings: – The types of tacit knowledge were mapped and became explicit through the application of the methodology proposed. A knowledge management system was created, as such knowledge was validated by other mechanics during their training on the shop-floor, which resulted in a structure of unique and shared knowledge. They became explicit for being stored in a knowledge base and presented to its users through the expert system. It is concluded that the methodology of acquiring collective tacit knowledge helped on the reduction of rework index by standardizing the way used to investigate the cause of the defect, in the studied company. Research limitations/implications: – The MACTAK methodology was developed for exclusive use in industrial processes where the following elements are presented: process, method, environment, raw materials, labor work, measurement and machine. In this method, the detection of the problem occurs from statistical data. Practical implications: – The methodology began in August 2010, and in October 2011, obtained as a result a reduction in rework cost equivalent to US$17,780.95. Originality/value: – The methodology is unique, as it refers to the systematic use of knowledge acquisition techniques and tools of quality, and the methodology has a characteristic of direct application in manufacturing processes. The beneficiaries, in this case, are mechanicals of production and quality inspectors that work at the operation level in the company. For the organizational and tactical level, the beneficiaries are engineers of production.

RESUMO: É evidente que o número de edificações com problemas associados às manifestações patológicas tem crescido nos últimos anos, seja devido às falhas congênitas, construtivas ou adquiridas. Acontece que, por vezes, o diagnóstico e prognóstico envolvem diferentes graus de incerteza e subjetividade. A metodologia GDE/UnB, complementada com ensaios de potencial de corrosão, pode ser uma alternativa interessante para uma análise mais assertiva quanto ao nível de deterioração, facilitando ações de manutenção e recuperação das estruturas de concreto. O procedimento metodológico consistiu na seleção de uma edificação e a realização de ensaio de potencial de corrosão com aplicação da metodologia GDE/UnB para quali-quantificar o nível de deterioração da estrutura. Como resultado, pôde-se identificar pontos de maior criticidade na edificação, além de zonas de maior probabilidade de corrosão dos elementos estruturais indicados pelo mapa de contorno equipotencial. It is evident that the number of buildings with problems associated with pathological manifestations has grown in recent years, either due to congenital, constructive or acquired failures. It turns out that sometimes the diagnosis and prognosis involve different degrees of uncertainty and subjectivity. The GDE / UnB methodology, complemented with corrosion potential tests, can be an interesting alternative for a more assertive analysis regarding the level of deterioration, facilitating actions for the maintenance and recovery of concrete structures. The methodological procedure consisted of selecting a building and conducting a corrosion potential test using the GDE / UnB methodology to qualify the level of deterioration of the structure. As a result, it was possible to identify points of greatest criticality in the building, in addition to areas of greater probability of corrosion of the structural elements indicated by the equipotential contour map.