The construction industry plays a fundamental role in the economy of a developing country, representing, in most of them, approximately 3.7% to 10.5% of its Gross Domestic Product. However, it is extremely important to search for sustainable alternatives in this sector, aiming to reduce the environmental impacts generated by the production of inputs, waste generation, in addition to the inappropriate disposal of this activity in the environment. Therefore, the work aimed to evaluate the technical and economic feasibility of the incorporation of residues (Marble and Granite Cutting Waste—MW and Construction and Demolition Waste—CDW) in the production of soil cement bricks (SCB). For the development of the present work, physical and mechanical characterization of the soil, residues (CDW and MW), composites (Control, MW15%, MW25%, MW50%, MW100%, MW30%CDW70%) were performed. After manufacturing the bricks, the characterizations mentioned were carried out at 7, 28 and 60 days, in addition to the evaluation of the geometric characteristics, water absorption and strength of the bricks and microscopic analysis of the post-rupture fragments. Additionally, a cost analysis of the use of SCB was performed compared to two different construction systems (ceramic brick and concrete block). From the results of physical characterization, soil was classified as clayey-silty sand (SC-SM), while the CDW was well-graded sand and MW as sandy clay. Soil and composite plasticity characteristics ranged from weakly plastic (MW15% and MW30%CDW70%) to highly plastic (MW100%). In the compaction tests, composites with the addition of MW presented increasing values in terms of optimal moisture. The compressive strength test performed showed satisfactory results for all composites, especially for MW25%, which obtained the most significant result with 13.777 kPa at 28 days. Thus, it is concluded that the incorporation of CDW and MW for the production of SCB represents a sustainable application for civil construction.
Several studies focus on the characteristic curve of the soil, which plays a fundamental role in the mechanics of unsaturated soils and is also an important indicator of the physical quality. Therefore, the objective of this research was to determine the characteristic curve of the soil by the methods of Filter Paper, Richards Pressure Chamber, and Haines Funnel on an erodible slope in the Metropolitan Region of Recife, in the state of Pernambuco, Brazil. The curves were designed by the models of van Genuchten, Fredlund & Xing, Seki, and Dunner. In the suction x humidity ratios, during the wetting and drying processes, the experimental points were very close, making it difficult to define the hysteresis effect. The Richards Chamber and Haines Funnel methods allowed the complementation of the characteristic curve for low suction values, indicating that the techniques can be used simultaneously. The statistical analysis resulted in a numerical model with a significance value greater than 97%.
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