EECA - Artigos publicados em periódicos

URI Permanente para esta coleçãohttp://200.137.215.59//handle/ri/1287

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Impedance and electrical conductivity of C-S-H
(2026) Faria, Túlio Honório de; Bonfim, Walter Batista; Matos, Oswaldo Cascudo
The impedance and complex electrical conductivity of C-S-H have not been directly measured, even though electromagnetic measurements are a key non-destructive technique for probing cement systems. Here, we evaluate the frequency-dependent electrical conductivity of C-S-H using molecular dynamics simulations for the first time. The effect of nanopore size is assessed for pores spanning the interlayer to the gel range, showing that interlayer conductivity is governed by subdiffusive ion dynamics while Fickean dynamics drives gel pores behavior. Ionic self-correlations dominate the conductivity, while water–ion and solid–ion contributions are smaller but non-negligible. By combining molecular dynamics with mean-field homogenization, we obtain gel-scale estimates consistent with available data (i.e., with ratio between gel conductivity and pore solution conductivity on the order of 1/100). As with other transport properties, accounting for anisotropy and associated dimensionality loss is critical for understanding electrical conductivity bottom-up. Our results provide direct evaluation of the frequency-dependent conductivity of C-S-H, offering valuable input for multiscale modeling and for interpreting electromagnetic measurements of cementitious materials.
Prediction of natural carbonation depths in concretes with ensemble metamodel based on artificial neural networks from time series analysis with 20 years of exposure
(2025) Campos Neto, Tiago Ferreira; Matos, Oswaldo Cascudo
networks, the ensemble architecture stands out due to its ability to combine different predictive models into a single metamodel, increasing the accuracy of predictions. However, applying these cybernetic models requires greater rigor on the completeness and robustness of the databases employed in the training and validation phases of neural networks. Treating the carbonation depth databases as time series can be a favorable strategy to guarantee completeness and robustness. Thus, this article aims to predict the carbonation depths of concrete structures using an AVR-SARIMA-LSTM-MLP ensemble metamodel with hybrid architecture for neural networks associated with time series analysis. The metamodel was based on several individual SARIMALSTM-MLP predictor models trained and validated with information from 36 concretes with different water/binder ratios (0.40, 0.55, and 0.77), types of mineral additions (rice husk ash, fly ash, blast furnace slag, metakaolin, silica fume, and reference – no mineral addition), and curing conditions (wet and dry). The concrete database was made available by the GEDur group and has 2313 depths of natural carbonation measured over 20 years of exposure in a controlled environment. The results of the AVR-SARIMA-LSTM-MLP ensemble metamodel predicted values for about 67 years after the concrete was produced, recording an average correlation coefficient of 0.93 and RMSE between 0.05 and 4.69 mm. These results demonstrate that the ensemble predictor metamodel has high predictive capacity, excellent precision, and accuracy, regardless of the characteristics and properties of the concretes, curing, and exposure conditions.
Effect of different mineral additions on colored self-compacting micro concrete produced with residual sand
(2026) Tassi, Andressa de Andrade; Bacarji, Edgar; Matos, Oswaldo Cascudo
Self-compacting micro concrete differs from traditional plastic concrete in that it eliminates coarse aggregate and has high fluidity and stability in the fresh state. Its use, combined with the use of waste, adds technical, economic, and envi-ronmental value. In addition, it expands the spectrum of applications of Portland concrete. The present work evaluated the effects of the incorporation of different mineral additions in colored self-compacting micro concrete, produced with artificial sand from rock crushing. Three binder: aggregate proportions (by mass) were used: 1:3.0, 1:4.5, and 1:5.5. As additions, a yellow-colored inorganic pigment and two supplementary cementitious materials of pozzolanic nature were used: silica fume and nanosilica. Then, properties were evaluated in the fresh state, such as fluidity, plastic visco-sity, and segregation. In the hardened state, compressive, tensile strengths, and modulus of elasticity were analyzed. Mineral additions implied rheological changes in the mixtures, in general producing an increase in viscosity and a reduction in segregation, as well as being outstanding in terms of increased mechanical strength. The hybrid mixtures composed of pigment, silica fume, and nanosilica, quaternary mixtures with cement, obtained the best results in terms of mechanical performance, showing significant synergy due to the combined use of these materials.
Numerical and parametric analysis of precast concrete composite beams with shear pockets and low interface stiffness under bending
(2026) Araújo, Daniel de Lima; Bernardes, Efraim Soares
Full-depth precast deck panels can enhance constructability and productivity while reducing construction costs for highway bridges. This paper presents a finite element model (FEM) for direct shear tests and of precast concrete composite beams with discrete connections made with shear pockets and U-shaped steel connectors. Constitutive laws are proposed for these interfaces to accurately represent the resistance, interface slip, and strain in the U-shaped steel connectors observed during testing. Additionally, a parametric analysis of precast composite beams was conducted to investigate the influence of interface slip, shear interface stiffness, and the degree of shear connection on the flexural strength of composite beams with discrete connections. The results indicate that appropriate constitutive laws are essential for accurately representing the behavior of connections utilizing shear pockets and U-shaped steel connectors. Furthermore, parametric analysis shows that the bending resistance of precast concrete composite beams with discrete connections and low interface stiffness can be estimated using simplified analytical models, independent of the interface stiffness, with results within 15% of those obtained from finite element models.
Manufacturing and characterization of high-performance fiber-reinforced concrete with locally available materials
(2025) Araújo, Daniel de Lima; Silva, Erlucivânia Bueno da; Cândido Saavedra, Eduardo Augusto da Silva; El Debs, Mounir Khalil
Commercial ultrahigh-performance fiber-reinforced concrete (UHPFRC) is expensive because of its use of complex materials and proprietary mix designs, which are often not locally available. In this study, high-performance fiber-reinforced concrete (HPFRC) using locally available materials and conventional technologies was developed for producing prefabricated structural elements. Two different types of steel fibers were analyzed. The developed HPFRC mixtures were characterized by using their compressive strength, modulus of elasticity, stress–strain relationship under uniaxial compression, and tensile strength. The tensile stress–strain relationship of the HPFRC specimens was also determined using various methods, including the modified double edge wedge splitting (DEWS) method proposed in this paper and a back-calculation approach involving finite element modeling. The HPFRC achieved a compressive strength of 100 MPa at 28 days and 130 MPa at 170 days after casting. By using steel fibers with a low aspect ratio, the compressive strength was reduced by up to 17%. Additionally, the developed concrete with 2% steel fibers did not exhibit compression softening behavior. The tensile stress–strain relationships of the HPFRC depend on the method used, and the results show that an inverse analysis from the four-point bending test on unnotched prisms provided a more accurate tensile property for the UHPFRC. The HPFRC with 2% steel fibers exhibited flexural-hardening behavior and met the minimum post-cracking tensile strength required for commercial UHPFRC. This resulted in ductile behavior in tension, making it suitable for use in structural members without the need for reinforcing steel.
Mechanism of tensile load sharing in hybrid reinforced concrete flexural members
(2026) Pleesudjai, Chidchanok; Patel, Devansh; Araújo, Daniel de Lima; Oliveira, Carlos A. S.; Toledo Filho, Romildo Dias; Mobasher, Barzin
This paper investigates the flexural behavior of Hybrid Reinforced Concrete (HRC), a composite material combining conventional rebars and short, randomly distributed fibers. The synergy between these components enhances serviceability stiffness, deflection control, ultimate strength, and load-sharing efficiency. Flexural experiments were conducted on nine HRC beams with varying proportions of flexural, skin, and fiber reinforcement. A closed-form analytical model was used to predict the moment-curvature and load-deflection responses, showing good agreement with experimental data for sectional strain, neutral axis depth, and deflection throughout the loading history. Results demonstrate that fiber significantly improves structural performance by delaying crack instability and increasing post-cracking stiffness. Replacing 50–80 % of longitudinal reinforcement with a 1.25 % volume fraction of steel fibers increased the serviceability moment capacity by 43–65 %. The fiber bridging mechanism was found to carry a substantial portion of the tensile load (74–92 %) in the cracked concrete matrix within the serviceability range, leading to higher stiffness retention. However, reducing the longitudinal reinforcement by as much as 80 % and replacing it with up to 1.25 % fibers decreased the ultimate load by 10–50 %.
Human–structure interaction during rhythmic jumping on rectangular plates subjected to time-dependent base excitation
(2025) Dias, Phablo Veríssimo Inácio; Prado, Zenón José Guzmán Del
This study examines the dynamic interaction between a human jumper and a thin rectangular plate subjected to time-dependent base excitation. The plate is modeled using the nonlinear von Kármán theory, while a one-degree-of-freedom spring–mass–damper (SMD) system is employed to represent the human biodynamic response. A detailed parametric investigation, grounded in piecewise-smooth contact dynamics, explores the effects of contact loss during the flight phase of jumping cycles. Various jumping strategies and the response of the plate are analyzed for incremental values of the human damping ratio, excitation frequency, and base excitation amplitude. The results reveal the emergence of chaotic responses, hysteresis phenomena, and coexisting attractors, underscoring the system’s sensitivity to parameter variations. Furthermore, variations in the SMD biodynamic properties substantially influence the plate’s behavior, while modifications in physical and geometric characteristics of the plate also affect the human response.
Exploration of active human–structure interaction during rhythmic jumping
(2026) Dias, Phablo Veríssimo Inácio; Prado, Zenón José Guzmán Del
This work presents a mathematical formulation for active human–structure interaction during rhythmic vertical jumping. The structure is represented by a single-degree-of-freedom (SDOF) nonlinear oscillator with cubic stiffness, while the jumper is modeled as a harmonically excited spring-mass-damper (SMD) system whose stiffness varies with the jump frequency. A piecewise-smooth contact dynamics formulation is used to allow the loss of contact between the jumper and the structure. Numerical simulations investigate how variations in propulsion force ratio, damping, and jump frequency influence the response of the coupled system on both non-resonant and resonant structural models. The results show that larger propulsion force values, combined with lower damping ratios, can lead to period-doubling and chaotic motions, whereas higher human damping mitigates these nonlinear effects. With moderate propulsion force levels, the system exhibits responses consistent with experimental results reported in the literature. At lower frequencies, softening bifurcations produce larger displacements for the jumper, while higher frequencies suggest new jumping strategies. When a resonant structural model is considered, the system exhibits sub-harmonic, high-order and chaotic responses driven by the interaction between piecewise leg stiffness and the structures’s cubic non-linearity. These regimes delineate frequency and propulsion force bands that, once further calibrated, can inform preliminary assessments of lightweight floors susceptible to human-induced vibrations.
Analysis of a database of instrumented static load tests on continuous flight auger piles in tropical soils
(2025) Cruz Júnior, Aleones José da; Rodriguez Rebolledo, Juan Felix; Bernardes, Heitor Cardoso; Sales, Maurício Martines
This article assesses the behavior of full-scale static load tests (SLTs) conducted with instrumentation for strain measurements, in order to provide insights into the pile load transfer curves along its length. A collection of instrumented SLTs from a specific region offers a valuable dataset for the geotechnical community, which can be leveraged for machine learning-based neural network studies and probabilistic-statistical analysis, ultimately enhancing the reliability of regional semi-empirical methods. This study presents an analysis of a database containing the results of 80 instrumented SLTs conducted on CFA (continuous flight auger) piles in the metropolitan area of Goiânia, Goiás, Brazil, spanning from 2016 to 2022. It establishes correlations between the pile’s maximum skin friction (ql max) and soil resistance, as well as between the pile shaft and pile base resistances, and relative displacement at the pile-soil interface (δint). The geotechnical surveys accompanying each SLT are also included in the database under examination, aiding in the definition of a representative geotechnical profile of Goiânia’s soil. The ql max values derived from the database exhibit significant dispersion compared to the semi-empirical methods commonly employed in Brazil. Additionally, these values span a broad range of δint, with considerably lower values for the superficial, porous, and structured layer of sandy clay compared to the deeper layers.
Low computational cost formulation for the analysis of the soil-structure interaction in frames considering the equilibrium in the deformed soil condition
(2026) Carvalho, Thiago Rodrigues; Sales, Maurício Martines; Almeida, Sylvia Regina Mesquita de
Lattice structures have a wide range of applications in real structures. For example, concrete buildings can be modeled as flat or spatial frames, while lattice or ribbed slabs can be modeled as grids. Computer programs frequently used for the design of buildings in Brazil allow the design to be carried out in spatial gantry and grid. Also, some include the possibility of applying calculated support settlements or manually introducing an elastic spring to simulate the behavior of the foundation. However, it is not possible to insert geotechnical data together with the structure for the geotechnical evaluation of soil deformation in an integrated way to obtain an analysis of the interaction between the stresses in the structure and the soil deformations, as well as to take into account the overlapping of stresses applied in the soil mass to evaluate settlements. In this context, classical solutions to analyze these domains together have been proposed with the use of the Finite Element Method (FEM) and by the coupling between the Boundary Element Method (SEM) and FEM. Despite being robust, these techniques are not yet commonly used in calculation offices, due to the high computational cost. In this sense, alternative formulations with lower computational cost, such as the one proposed herein, can be a viable alternative for the analysis of the effects of soil-structure interaction in conventional structures without significantly impairing computational performance. Thus, to approximate the computational analysis to the real behavior of structures, this article proposes an efficient and low-cost computational matrix analysis solution for the integration between structural and geotechnical models, considering the soil-structure interaction. Thus, the integrated model considers the compatibility between the forces calculated in the structure and the settlement prediction, carried out, considering the soil deformation caused by the global contribution of stresses, in such a way as to consider in the analysis of the soil, both the tensions arising from the support itself and those transmitted by the other foundation elements. The proposed alternative formulation was verified for isolated structural analyses, geotechnical isolates and finally considering the coupled form with equilibrium in the deformed condition of the soil, paying attention to the robustness of the implementation.
Foundation practice and design in Brazil: a brief review of past and future developments
(2025) Cunha, Renato Pinto da; Kormann, Alessander Christopher Morales; Gusmão, Alexandre Duarte; Danziger, Bernadete Ragoni; Chaves, Charles Pereira; Tsuha, Cristina de Hollanda Cavalcanti; Monteiro, Fernando Feitosa; Albuquerque Junior, Fernando Saboya; Lopes, Francisco de Rezende; Bernardes, Heitor Cardoso; Giacheti, Heraldo Luiz; Sales, Maurício Martines; Aguiar, Marcos Fábio Porto de; Albuquerque, Paulo José Rocha de
Brazilian experience in the design and execution of foundations to support superstructures of distinct sorts goes way back to the early colonial period of the XVI century, a few years after the discovery of this land (Katinsky, 1994). Since then, the geotechnical technology related to such constructions has been considerably upgraded and expanded to new system types. The present manuscript aims to briefly review some key aspects of the foundation practice in Brazil during its last decades of development, from the mid-20th century to the present daytime. It does not intend to make a state-of-the-art of the subject but rather highlights the most interesting and relevant points in this evolutionary process of design and construction techniques. Prospective or future foundation technologies will also be envisaged. Given space limitations, it will definitively be narrowed, absent or eventually unfair in some topics or comments. Still, it will serve to highlight the importance of this particular field in the context of the special celebration issue of the 75 years of the Brazilian Soil Mechanics Association. It has been collectively written by some of the most experienced and renowned practitioners and researchers of the Brazilian geotechnical society, despite the absence of so many high-quality others that could equally be present herein. Time and space, unfortunately, have deprived this manuscript of a broader participation and scope.
Modelagem da suscetibilidade a deslizamentos em taludes infinitos e sua relação com processos erosivos laminares, por meio de técnicas de geoprocessamento, na bacia de contribuição direta da UHE Batalha
(2025) Medeiros, Glacielle Fernandes; Romão, Patrícia de Araújo; Luiz, Gislaine Cristina; Vargas, Carlos Alberto Lauro; Sales, Maurício Martines; Luz, Marta Pereira da; Almeida, João Guilherme Rassi
In areas of irregular relief, slope stability analysis techniques can be applied to estimate safety conditions. The main variables in slope stability analysis include the morphological, pedological and soil physical parameters. In this context, this study applies geoprocessing techniques at a scale of 1:25,000 to analyse the relationship between the stability of infinite slopes and the occurrence of laminar erosion processes in the Direct Contribution Basin (DCB) of the Batalha HPP reservoir. The aim of this research is to estimate a predictive model for landslides on natural slopes, based on the Preliminary Safety Factor (PSF). The methodology was based on the limit equilibrium method for infinite slopes, using techniques available in Geographic Information Systems. Scenarios with zero cohesion and neutral pressure increased the susceptibility to mass movements, reducing the Preliminary Safety Factors. Due tothe proximity of the reservoir to the slopes and considering the seasonality between the dry and wet seasons, there is constant variation in the parameters of cohesion and neutral pressure, resulting in maps with dynamic characteristics in the analysis of slope stability.
Controle de ruídos nos sistemas prediais hidrossanitários: revisão de literatura
(2025) Rocha, Dariane Gomes; Ywashima, Laís Aparecida; Guimarães, Cibele de Moura; Reis, Ricardo Prado Abreu
This systematic literature review explores the state of the art and identifies gaps in the scientific literature regarding noise generated by hydrosanitary systems in residentialbuildings. Both quantitative and qualitative results are presented, along with a framework connecting the current state of research to the needs and opportunities in this field. Although relatively few publications on this subject are found in journals indexed in major research databases, studies addressing the annoyance caused by this type of noise and methods to control it are common. The findings aim to: (a) map the key scientific and technical references available in the literature; (b) with the state of the art of research and discussions relevant to noise control in plumbing systems; and (c) identify the primary research gaps. These results provide a deeper understanding of the acoustic performance of hydro-sanitary systems, supporting efforts to enhance comfort and well-being for users of residential buildings.
Abordagens em pesquisas mercadológicas no mercado imobiliário - uma revisão sistemática
(2025) Brito, Larissa Santos; Brandstetter, Maria Carolina Gomes de Oliveira
All agents involved are interested in reliable and systematized information that helps consumers better absorb real estate market products. To this end, market research is a frequently used path to greater understanding of the forces that govern the market. The assertiveness of the definition of the data source and the method to be used considering the question sought to be answered, in addition to the careful elaboration of the collection instrument, are fundamental for the quality of the expected result. Thus, through a Systematic Literature Review, this study aims to understand what types, data sources and collection techniques are used in market research with clients and users in the real estate market, and for what purposes. The results obtained indicate that the use of secondary data in these researches is more recent, and more frequent when the objective is to evaluate the formation of property prices, while primary data are more used to understand preferences and demands and decision processes –For this purpose, questionnaires and interviews are used more frequently, respectively. Furthermore, the types of characteristics considered in the process also vary depending on the objective of the market research in question.
Modelos de prognóstico de produtividade na construção civil: caracterização e análise crítica comparativa em estudo de caso
(2025) Correa, Marcelo Inocencio Ferreira; Brandstetter, Maria Carolina Gomes de Oliveira; Romagnoli, Larsson Diogo Seabra Coelho
The productivity rates used as references by construction companies are generally obtained empirically, either through databases of previous projects or based on reference indices from budgeting manuals. However, the use of average productivity indicators represents an overly simplistic approach considering the current need for a deeper understanding of construction activities, given the large number of content and context factors that can influence services. An alternative for predicting productivity lies in forecasting models, which are systematic approaches used to develop mathematical or computational representations that describe the reality of a system, process, or phenomenon. Thus, this study aims to apply and compare four different modeling techniques for productivity forecasting, including two statistical models and two artificial intelligence models. The productivity forecasting was carried out based on nine content and context input factors deemed significant for concrete formwork execution services. The different models employed were evaluated. The results demonstrate that it is not always possible to find the best accuracy parameters within a single model.
Impact of COVID-19 mild lockdowns on residential water consumption: evidence from Brazil
(2026) Morais, Lucas Salomão Rael de; Campos, Marcus André Siqueira; Baumann, Luis Rodrigo Fernandes; Cobacho Jordán, Ricardo
During the COVID-19 pandemic, the strictness of confinement measures varied widely across regions and countries, potentially influencing household water-use behaviour and leading to different consumption patterns between pre-pandemic and pandemic periods. This study investigates changes in residential water consumption in a mid-rise condominium in Goiânia, Brazil, by comparing data from the pre-pandemic and pandemic phases under conditions of a mild lockdown. Monthly water consumption records from 44 apartments were analysed from January 2018 to December 2022 using a multi-method statistical approach. The data were non-normally distributed, with most monthly consumption values ranging between 5 and 25 m3 . Fewer outliers were observed during the pandemic, along with a general downward trend in water consumption over time. Comparison of means using the non-parametric Kruskal-Wallis test suggested potential differences between the two periods; however, these differences were not statistically significant under the adopted significance threshold. The results diverge from patterns commonly reported in the literature. These can be attributed to the specific local context experienced during the COVID-19 pandemic, characterised by a short period of effective isolation, resistance to restrictive measures, low adherence to social distancing, and recurrent water scarcity in the region.
Microstructural characteristics of sand asphalt mortar
(2025) Curado, Tallyta da Silva; Rezende, Lilian Ribeiro de; Teixeira, Jamilla Emi Sudo Lutif; Kim, Yong-Rak
Fine aggregate matrix (FAM), an intermediate scale of asphalt concrete (AC), helps identify how small-scale mixture components affect overall AC-scale mechanical behavior. However, investigating FAM does not straightforwardly identify the influence of asphalt binders on AC fatigue behavior due to fine aggregates mixed in FAM. To address this limitation and minimize the variability caused by different fine aggregates, some researchers propose using sand asphalt mortar (SAM) to exclusively focus on the binder effect. To better represent binder characteristics using SAM, it is critical to identify the correct binder amount and its volumetric characteristics. This study aims to perform an in-depth evaluation of SAM microstructural characteristics, specifically air void (AV) and binder film thickness (FT). Thus, six SAM samples, fabricated with Ottawa sand and two types of asphalt binder at three contents (6 %, 8 %, and 10 %) were produced in cylindrical bars. Furthermore, one FAM mixture derived from its AC mixture was also evaluated for comparison. To assess location-dependent microstructural characteristics, the samples were cut into three parts (top, middle, and bottom), which were examined for measuring AV and FT. Test results showed that average AV and median FT were the best parameters to consider. SAM specimens were homogeneous in terms of FT for any content or asphalt binder type; however, in terms of AV, homogeneity was only observed at a 6 % binder content. It is noted that FT values were smaller than 60 µm from both SAM and FAM samples, which is significantly lower than the thickness used at parallel plate geometry (i.e., 1–2 mm thick) in typical rheological tests. These findings indicate that SAM is considered a reasonable mix to effectively characterize binder behavior in AC mixtures due to its realistic film geometry, which is significant for understanding the effects of binder on viscoelastic mechanical properties in AC mixtures.
Criteria for research productivity grants in Brazil applied to civil engineering: reflections on gender differences and the current context
(2025) Rezende, Lilian Ribeiro de; Castelo Branco, Veronica Teixeira Franco; Savasini, Kamilla Vasconcelos; Luz, Marta Pereira da; Casagrande, Michele Dal Toé; Thives, Liseane Padilha; Lucena, Lêda Christiane de Figueirêdo Lopes; Bernucci, Liedi Legi Bariani
This article addresses gender issues in the context of the professor’s productivity grants (PQ) distribution applied to Civil Engineering. It contributes with reflections on the advancement of knowledge and gender equality through the inclusion of integrity and holistic aspects. A quantitative and descriptive data analysis of public documents revealed that the number of women civil engineers is considerable, and that female professors engaged in postgraduate are capable of competing for scholarships. Nevertheless, less than 20% of PQ scholarships are awarded to female civil engineers, and the current scenario point to a gender disparity in terms of approval PQ demands. Moreover, despite the majority having already reached the pinnacle of their academic careers, only one has been designated at the highest level, and none have attained the rank of Senior. These findings can indicate segregation, structural barriers, lack of support and policies that encourage access to the highest levels of scholarships, possible subjectivity in the judgment that lead to the lack of impartiality and discrimination, and other factors that may still be understood as gender discrimination. Thus, the PQ criteria can be reviewed in light of the Brazilian National Care Policy, Sustainable Development Goal 5, and gender mainstreaming.
Dynamic semicircular bending testing for asphalt mixture fatigue evaluation
(2025) Melo, Karolayne Peres de; Teixeira, Jamilla Emi Sudo Lutif; Rezende, Lilian Ribeiro de
Determining the fatigue life of asphalt mixtures is an important step in predicting the performance of flexible surface courses, and it is necessary to use laboratory tests that adequately represent the mechanisms that lead to the failure of mixtures due to fatigue. Currently, methods such as Indirect Tensile Test (IDT), Four-Point Beam Bending (4PB) and Direct Tension (DT) are used for this purpose. Due to their practicality and speed, static fracture tests such as Semi-Circular Bending (SCB) are also widely used, but they do not allow fatigue life to be determined. This study aims to investigate the viability of the dynamic SCB test as an alternative for obtaining fatigue life coefficients in order to optimize the analyses required for the mechanistic-empirical design of sidewalks. Initially, two systematic mappings were carried out to support the methodological decisions. Static and dynamic SCB tests and IDT fatigue tests were then carried out on two asphalt mixtures. The results were statistically compared to assess the agreement between the methods and indicated that, although there were differences in the fatigue curve coefficients obtained by the dynamic SCB and IDT tests, this was not statistically significant and both had similar fatigue performance ratings. This suggests that dynamic SCB tests are an interesting tool for evaluating fatigue and can optimize asphalt pavement design. The study highlights the importance of developing simplified and effective test methods to ensure sustainability, efficiency and safety in transportation infrastructure projects.
Estudo para produção de amostras do tipo argamassa areia asfalto
(2025) Alves, Leonardo Zanelati; Furtado, Giulia Lobo; Curado, Tallyta da Silva; Rezende, Lilian Ribeiro de
This study aimed to evaluate changes in the air void volume of entire and cut cylindrical specimens of Sand Asphalt Mortar (SAM), produced with binder contents of 6%, 8%, and 10%. To this end, laboratory tests were conducted to evaluate the compaction procedure and the variation in air void volume as a function of the binder content used and the height of the cylindrical sample, which was 50 mm. The tests conducted were sample compaction and volumetric tests, utilizing the Rice method for the uncompacted sample and the hydrostatic balance test for the compacted sample. Statistical studies were carried out on specimens with binder contents of 6%, 8%, and 10%. Through these tests and box plot graphs, it was found that the 10% specimens showed better results, i.e., lower air void volume values, which indicate better compaction. Thus, it’s expected to contribute to the methodology of fatigue studies for asphalt binders, where the SAM sample is obtained simply and economically, allowing for testing in a dynamic shear rheometer and yielding representative and reliable results.

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