Stakeholders’concern towards the ecological damage arising out of emissions from the industrial processes has raised serious issues before the industrial sectors.Environmentalists and researchers are raising these is...Stakeholders’concern towards the ecological damage arising out of emissions from the industrial processes has raised serious issues before the industrial sectors.Environmentalists and researchers are raising these issues in various forums.Few industrial sectors are well informed about environmental protection and act accordingly to address these issues by complying with environmental norms.However,some firms are more ethical in their business and proactively redefine their operations and policies beyond the regulatory requirements.What factors compel these firms to go beyond the extant laws to protect the environment?This study statistically analyses India’s cement sector for the factors that may be the drivers of environmental proactivity.Using Structural Equation Modelling(SEM),eight hypotheses were tested.The study’s findings can be helpful for the policymakers,environmental managers,and industrial sectors to frame policies for environmental protection,which will redound to societal benefit.展开更多
The present work consisted in carrying out a study on the effective formulation of concrete for an optimal resistance to compression (fc28) between 20 and 30 MPa for the sites animated by the actors of the informal an...The present work consisted in carrying out a study on the effective formulation of concrete for an optimal resistance to compression (fc28) between 20 and 30 MPa for the sites animated by the actors of the informal and semi-informal sectors of the construction. Studies have been carried out on projects under construction, by taking samples of fresh concrete in order to evaluate their real compressive strengths. These surveys show that there is a problem in the concrete formulation, as nearly 2/3 of the results show the lack of technical knowledge on concrete formulation practices. Indeed, on eight sites surveyed and whose fresh concrete samples were taken, only two sites (7 and 8) report fairly consistent results. Their 28-day compressive strength values are respectively 35.36 and 22.18 MPa. In addition, various formulations proposed with aggregates from different quarries or extracts from the bed of the Congo River, were determined in the laboratory. This study allowed us to obtain fairly objective results overall, which is characteristic of concretes of required quality. Of the six (06) formulation proposals, average resistances of 19.6 MPa at 07 days and 25.28 MPa at 28 days were obtained. These results at 28 days are in the range of 20 to 30 MPa, set as objective in this study. These formulations can be a reliable source for concrete manufacturers in these construction sectors. Similarly, the statistical study based on principal component factor analysis tests has shown that the most appropriate formulation, in terms of mechanical resistance, is that proposed with sand extracted from the Congo River (formulation 3). This is justified by the fact that this sand is consistent and has a good granular distribution.展开更多
文摘Stakeholders’concern towards the ecological damage arising out of emissions from the industrial processes has raised serious issues before the industrial sectors.Environmentalists and researchers are raising these issues in various forums.Few industrial sectors are well informed about environmental protection and act accordingly to address these issues by complying with environmental norms.However,some firms are more ethical in their business and proactively redefine their operations and policies beyond the regulatory requirements.What factors compel these firms to go beyond the extant laws to protect the environment?This study statistically analyses India’s cement sector for the factors that may be the drivers of environmental proactivity.Using Structural Equation Modelling(SEM),eight hypotheses were tested.The study’s findings can be helpful for the policymakers,environmental managers,and industrial sectors to frame policies for environmental protection,which will redound to societal benefit.
文摘The present work consisted in carrying out a study on the effective formulation of concrete for an optimal resistance to compression (fc28) between 20 and 30 MPa for the sites animated by the actors of the informal and semi-informal sectors of the construction. Studies have been carried out on projects under construction, by taking samples of fresh concrete in order to evaluate their real compressive strengths. These surveys show that there is a problem in the concrete formulation, as nearly 2/3 of the results show the lack of technical knowledge on concrete formulation practices. Indeed, on eight sites surveyed and whose fresh concrete samples were taken, only two sites (7 and 8) report fairly consistent results. Their 28-day compressive strength values are respectively 35.36 and 22.18 MPa. In addition, various formulations proposed with aggregates from different quarries or extracts from the bed of the Congo River, were determined in the laboratory. This study allowed us to obtain fairly objective results overall, which is characteristic of concretes of required quality. Of the six (06) formulation proposals, average resistances of 19.6 MPa at 07 days and 25.28 MPa at 28 days were obtained. These results at 28 days are in the range of 20 to 30 MPa, set as objective in this study. These formulations can be a reliable source for concrete manufacturers in these construction sectors. Similarly, the statistical study based on principal component factor analysis tests has shown that the most appropriate formulation, in terms of mechanical resistance, is that proposed with sand extracted from the Congo River (formulation 3). This is justified by the fact that this sand is consistent and has a good granular distribution.
