Engenharia Civil
URI Permanente desta comunidade
Programa de Pós-Graduação em Engenharia Civil
Centro: CT
Telefone: (27) 4009 2146
URL do programa: http://www.civil.ufes.br/pos-graduacao/PPGEC
Navegar
Navegando Engenharia Civil por Autor "Alledi, Carla Therezinha Dalvi Borjaille"
Agora exibindo 1 - 4 de 4
Resultados por página
Opções de Ordenação
- ItemAvaliação do coproduto siderúrgico KR como estabilizador para diferentes tipos de solo(Universidade Federal do Espírito Santo, 2024-03-28) Fardin, Henrique Delboni; Gomes, Guilherme José Cunha ; https://orcid.org/0000-0001-9510-4600; http://lattes.cnpq.br/1437609255681568 ; Pires, Patrício José Moreira ; https://orcid.org/0000-0001-5445-1753 ; http://lattes.cnpq.br/0913529658589507 ; https://orcid.org/0009-0005-5351-6021 ; http://lattes.cnpq.br/7146116210406485 ; Ribeiro, Wagner Nahas; https://orcid.org/0000-0002-4130-9093 ; http://lattes.cnpq.br/1143022421703767 ; Alledi, Carla Therezinha Dalvi Borjaille ; https://orcid.org/0000-0002-8429-731X ; http://lattes.cnpq.br/4542859765962073Brazilian road transport sector is responsible for 65% of freight transportation and faces challenges, with only 12.4% of its road network paved. The research highlights the shortage of materials for paving, driving the study of the steel co-product KR (CP KR) as a soil stabilizer. As this residue demonstrates technical and environmental feasibility for use in pavements, the aim of the work was to evaluate the performance of the steel co-product type KR as a soil stabilizer for paving. Laboratory tests were conducted to evaluate the physical, mechanical, and mechanistic parameters of soils with different percentages of fines and related to results obtained by other authors. The study on CP-KR for paving revealed its potential in modifying the physical indices of soils and increasing mechanical strength. The greatest increases in strength occur in soils with 55% fines, while the Resilient Modulus increased more in less clayey soils, reaching a strength increase of 275%. The soils showed a significant reduction in plastic deformation, with an average decrease of 72%. The results demonstrated the potential of CP-KR as a soil stabilizer for the composition of road pavements
- ItemAvaliação do uso de escória de aciaria LD com diferentes emulsões asfálticas para microrrevestimento asfáltico a frio(Universidade Federal do Espírito Santo, 2025-04-04) Scotá, Nadia Maria Drago; Pires, Patrício José Moreira ; https://orcid.org/0000-0001-5445-1753; http://lattes.cnpq.br/0913529658589507; https://orcid.org/0009-0005-5170-2509; http://lattes.cnpq.br/6399701824213203; Rebelo, Karla Maria Wingler ; https://orcid.org/0000-0001-6972-2528; http://lattes.cnpq.br/6432874252149858; Alledi, Carla Therezinha Dalvi Borjaille ; https://orcid.org/0000-0002-8429-731X; http://lattes.cnpq.br/4542859765962073The asphalt coating undergoes aging due to the demands imposed by vehicle loads and weather conditions. Micro surfacing is a type of treatment available for the maintenance and preservation of pavements, as it reduces the evolution of defects, rehabilitates functional conditions, and increases the lifespan of the roadway. In search of alternative aggregates to meet the demand for natural aggregates, which also provide satisfactory performance for micro surfacing mixtures, the use of LD steel slag is evaluated, as it exhibits high mechanical resistance and adhesion with asphalt binders. Thus, the research aims to verify, through the evaluation of the mechanical behavior and performance of the mixtures, the feasibility of using LD steel aggregates compared to natural aggregates associated with two different asphalt emulsions in the production of micro surfacing mixtures. For this analysis, six mixtures were used, combining three aggregate compositions: 100% natural aggregate (type 1), 50% natural aggregate and 50% steel aggregate (type 2), and 100% steel aggregate (type 3) with two different asphalt emulsions designated A and B. The methodology is divided into three stages and is based on the national standard DNIT-ES 035/2018 and the international standard ISSA-A 143/2010. The first stage refers to the complete characterization of natural and steel aggregates, the second focuses on defining the granulometric composition of the three aggregate compositions, and the third presents the dosage study of the mixtures with the definition of emulsion content and evaluation of the behavior, compatibility, and performance of micro surfacing mixtures in the laboratory. In addition to the tests defined by the national standard, the compatibility characteristics of type B mixtures were evaluated through a more rigorous test called Schulze - Breuer and Ruck (ISSA TB 144/2019). All mixtures presented an optimal emulsion content lower than the minimum content. Overall, mixtures type 1, type 2, and type 3 showed satisfactory results and meet national usage specifications, with type 1 mixtures achieving the best results. Furthermore, regardless of the aggregate composition, the mixtures subjected to the Schulze - Breuer and Ruck test did not meet the minimum score required to be suitable for use in micro surfacing
- ItemAvaliação em laboratório e em campo por meio de simulador linear de tráfego móvel de solos estabilizados com coproduto KR, cimento Portland e Blindasolo®(Universidade Federal do Espírito Santo, 2019-05-09) Furieri, Elaine Cristina; Pires, Patricio Jose Moreira; https://orcid.org/0000000154451753; http://lattes.cnpq.br/0913529658589507; https://orcid.org/; http://lattes.cnpq.br/5817644700538134; Ribeiro, Romulo Castello Henriques; https://orcid.org/; http://lattes.cnpq.br/2908680315943772; Alledi, Carla Therezinha Dalvi Borjaille; https://orcid.org/0000-0002-8429-731X; http://lattes.cnpq.br/4542859765962073; Teixeira, Jamilla Emi Sudo Lutif; https://orcid.org/0000000178054218; http://lattes.cnpq.br/8494517346511042Pavements are multi-layer structures, responsible for absorbing and distributing the traffic load of vehicles that circulate through them. The tensions and deformations to which the structure is subjected depend mainly on the thickness of the layers and the rigidity of the materials used. The layers, which constitute a pavement, are often constructed with improved soils and / or soils with other materials, a procedure called soil stabilization. The local soil does not always have adequate characteristics for use in sub-base and base of pavements, and in order to make feasible the work, the stabilization of the local soil becomes necessary. There are consecrated and widely used ways to stabilize a soil for paving purposes, such as Portland cement, but it is necessary to search for new materials, given the high cost and scarcity of natural resources. Recent works show that the steel industries started to include in the process the disulfurization step of liquid pig iron in the Kambara reactor, producing a slag commonly called disulfurization slag from the Kambara reactor (KR co-product). Studies show that this type of slag can trigger pozzolanic reactions, conferring some binding quality, as well as other mechanical properties of resistance. This work studies the incorporation of the KR co-product in granulometry from 0 to 19 mm to the two studied soils, in proportions of 15%, 20% and 25% of KR co-product. The chemical stabilization of soils is also studied with an additive named commercially from Blindasolo®, with reagents and product concentrations indicated by the manufacturer. An experimental program was developed in the laboratory to determine the physical and mechanical characteristics of the soils and mixtures studied. Soon after this stage, four experimental tracks were built in the field with the mixes studied as sub-base and base of the tracks, and each of them, submitted to the HVS (Heavy Vehicle Simulator) mobile traffic simulator. for a number of cycles corresponding to 10 years of project life. In each of the tracks a deflectometric survey was carried out along the simulation to analyze the structural quality of each track. It has been demonstrated through laboratory and field trials that the KR co-product is an option in soil stabilization, indicating this as a possible replacement for the traditional stabilization with Portland cement.
- ItemComparação de curvas de retenção e condutividade hidráulica de solos tropicais e temperados não saturados(Universidade Federal do Espírito Santo, 2020-05-28) Poltronieri, Vinicius Rocha; Bicalho, Katia Vanessa; https://orcid.org/0000-0002-2157-7322; http://lattes.cnpq.br/9639299365620025; https://orcid.org/; http://lattes.cnpq.br/9362518542358232; Silva, Maristela Gomes da; https://orcid.org/0000000271041972; http://lattes.cnpq.br/4450263733589061; Araujo, Georgia Serafim; https://orcid.org/0000-0002-2029-6334; http://lattes.cnpq.br/4707150428037806; Dantas, Bruno Teixeira; https://orcid.org/0009-0008-9921-7205; http://lattes.cnpq.br/9702567694302789; Alledi, Carla Therezinha Dalvi Borjaille; https://orcid.org/0000-0002-8429-731X; http://lattes.cnpq.br/4542859765962073Knowledge of the soil water retention curve (SWRC) and the hydraulic conductivity curve (HCC) is important in understanding the behavior of unsaturated soils. The called pedotransfer functions (PTFs) are used to transform easy to measure data, such as the soil particle size distribution, into data that are difficult to measure, such as SWRC and HCC. This dissertation investigates the influence of the particle size distribution and textural classes on the SWRC and the HCC of a hydrophysical database of Brazilian soils. The equation proposed by van Genuchten (1980) is adopted to define the SWRC and HCC curves of these soils. The experimental data were separated according to three classifications: (a) classification in 10 subgroups based on the percentage of fines (Fc), (b) classification in 5 textural classes based on the textural triangle called FAO (Food and Agriculture Organization of the United Nations) and (c) classification in 12 textural classes based on the USDA (United States Department of Agriculture) textural triangle. The analyzes were compared with results obtained in the literature for temperate soils. The results suggest that the influence of Fc is not observed in the adjustment parameters of the van Genuchten equation (1980) for soils with Fc> 10% for HYBRAS soils and Fc> 30% for UNSODA soils. These parameters should not be interpreted as having physical meaning. The influence of the soil particle size distribution on saturated hydraulic conductivity and HCC is limited for the three investigated classifications. In general, the information limited on the soil particle size distribution is not enough to describe the variability of SWRC and HCC for the soils investigated in this research. It is recommended caution in the use of PTFs for soils different from those used to define these mathematical functions.