This research aimed the characterization of the current production of construction waste in the city of Manaus, Amazonas, Brazil, and its impacts on the environment of the Amazon Region. The significance of this research work is to contribute to the improvement of the environmental management of waste in the construction sites of the city of Manaus, with the aim of preserving the Amazonian environment. This research also sought to characterize the existing problems in the environmental management of construction waste in four construction sites, with areas greater than 9,000 square meters. The methodology adopted was based on the application of an in situ survey in four construction sites in the city of Manaus, Amazonas, Brazil, administered by three companies representing the construction sector in the Amazon Region. Data were collected at the construction sites in question in the second half of 2018, regarding the types of construction waste produced, respective volumes, destination and associated costs. A comparison was made between constructed areas and volumes of waste produced, characterizing the current situation of construction waste production in the city of Manaus. After analysing the results obtained, it was concluded that due to the high associated costs, companies avoid recycling construction waste, and opt to discharge it in municipal or clandestine landfills, with significant environmental impacts. For this reason, a greater participation of the Public Administration is recommended regarding the adequate management of waste in construction sites, namely offering financial incentives for companies to promote the recycling and reuse of construction waste.

This work presents a study of the physical and mechanical performance of tests on two different traces of porous concrete, popularly known as permeable concrete. Currently problems related to flooding in areas of excessive occupation of impermeable soil has worried experts in urban drainage, the use of the type of concrete used in this research facilitates the surface runoff helping in the acceleration of the permeability of water coming from rains that cause flooding and floods mainly in poorly planned urban areas. Cement and water were used for the preparation of the samples and in order to ensure a greater safety in the variation of tensile strength of the specimens, 10 samples were made in the last proposed test until a difference rate was reached minimum between the result of the compression analyzes thus making a material that resists to areas related to the traffic of people like sidewalks, catwalks and even bike paths.

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This research studies the carbonation phenomenon of cement due to the reaction of its components with water. In this chemical reaction occurs the formation of calcium carbonate and the absorption of CO2 in the atmosphere, which contributes to the reduction of the Greenhouse Effect. However, carbonation also causes pathologies such as efflorescence, staining and corrosion of steel in concrete. This research shows the results of experiments with specimens of concrete permeable, made with cement and big aggregates (calcareous stone) in the ratio of 1: 4.4 (cement: stone) and a factor of 0.3 for water / cement. The specimens were kept in contact with water containing different amounts of CO2 - distilled, ionized alkaline, carbonated, and tap water. After the experiments were carried out, an increase in pH, a mean compressive strength of 12.3 MPa and a permeability rate of 1.28 l / h was observed. The results show that the permeable concrete did not present any pathologies resulting from the carbonation during the period of the research, which recommended the same for use in road pavements.

This article is based on the production of concrete with vegetable fiber (buriti), emphasizing the effect of carbonation as a form of prevention in relation to pathological causes caused in reinforced concrete. The structuring of this project is done through the preparation of a conventional concrete as the basis of the study to be applied as addition and / or replacement of cement in 0.5% and 1.0% of buriti fiber. After the rupture at 28 days, these materials were exposed and the chemical indicator of phenolphthalein was applied to be observed at 7, 28, 63, 91 and 120 of the spray.