1. Technological properties of a self-bloating clay and expanded-clay aggregate for the production of lightweight concrete

Abstract The global interest in an increasingly sustainable economy, with a reduction in the consumption of raw materials and energy, can be supported by the growth in the use of lightweight concrete (LC) produced with expanded-clay aggregates (EA). The main qualities of natural self-bloating clay for the production of EA were studied, analyzing the paramete

Cerâmica. Publicado em: 2023

2. Optimum design of steel columns filled with concrete via genetic algorithm: environmental impact and cost analysis

Abstract The use of concrete-filled tubular columns as part of structural systems has steadily increased throughout the years. The growing demand for structural elements of this nature is a direct result of the possibility to use various cross-section shapes that have increased strength, along with resistance to fire and other corrosive agents. The main obje

REM - International Engineering Journal. Publicado em: 2022

3. Pressed roofing tile based on cementitious material and basalt powder: Technological and toxicological characterization

Abstract This study aims to develop a pressed concrete roofing tile from powder technology containing basalt powder in substitution of fine sand (aggregate) for application in building covers. Specimens were submitted to technological and toxicological characterization. Hence, pressed specimens based on cement and basalt powder were analyzed. In the bending

REM - International Engineering Journal. Publicado em: 2022

4. Evaluation of the influence of sodium and magnesium lignosulfonates on the hydration kinetics of cementitious paste

Abstract Motivated by their low cost, lignosulfonate-based water reducers are the most used type of admixture in the concrete industry worldwide. Due to the plurality of types of lignosulfonates (LSs) and the recent update to the Brazilian standard for admixtures for concrete, the objective of this work was to investigate the impact of sodium (Na-LS) and mag

Cerâmica. Publicado em: 2022

5. Mullite macro-needles for reinforcement of refractory castables

Abstract Ceramic macro-needles incorporation as reinforcement in commercial refractory castable was studied. Ceramic macro-needles (Ø2x20 mm) were made from kaolinite clay and gibbsite to obtain mullite as the main crystalline phase. Specimens with the ceramic reinforcement were evaluated by compression after being treated at two temperatures (815 and 1400

Cerâmica. Publicado em: 2022

6. Evaluation of the use of blast furnace slag as an additive in mortars

Abstract Clinker is the raw material used in the manufacture of cement. However, this material is very harmful to the environment, since it is estimated that for every ton of clinker produced, about 1.0 ton of CO2 is released into the atmosphere. For this reason, alternatives were sought for the use of other materials that are less harmful to the environment

REM - International Engineering Journal. Publicado em: 2022

7. Durability, life cycle cost and life cycle assessment of binary mixtures with fly ash, rice husk ash and concrete demolition waste

Resumo Este estudo analisa, por meio do custo do ciclo de vida e da avaliação do ciclo de vida, a produção de misturas binárias de concreto constituídas por pozolanas artificiais e resíduos de demolição de concreto. Foram desenvolvidas dez formulações diferenciando-as quanto aos traços, conteúdo de ligantes e agregados, a fim de verificar o pote

Ambiente Construído. Publicado em: 2022

8. Numerical analysis of reinforced concrete beam subject to pitting corrosion

Resumo Neste artigo é apresentado um estudo numérico sobre os efeitos da corrosão induzida por cloreto na vida útil de elementos estruturais. Um modelo mecânico bidimensional geometricamente não linear baseado no Método dos Elementos Finitos (MEF) foi desenvolvido para a análise de estruturas de concreto armado. O estágio de iniciação da corrosão

Ambiente Construído. Publicado em: 2022

9. Colorectal Cancer: Comparative Analysis Between Two Series of Patients Separated by More Than Three Decades

Abstract Aim This study characterizes Colorectal Cancer (CRC) incidence in the University Hospital Ramon and Cajal, Madrid, and analyzes variations over time. It establishes risk groups, aiming to discover whether diagnosis can be determined in less advanced stages of disease. Method Evolutionary epidemiological study of genetic and environmental factors c

Journal of Coloproctology (Rio de Janeiro). Publicado em: 2022

10. ROBÓTICA EDUCACIONAL, ENSINO DE QUÍMICA E APRENDIZAGEM COOPERATIVA: UMA PROPOSTA PARA O CURSO DE ENSINO SUPERIOR EM ENGENHARIA CIVIL

Students, generally, are afraid of studying chemistry because they understand that it is a very complex area of knowledge and that it doesn’t has use in daily lives and in intended profession, which is a problem we identified in a Civil Engineering course. With this, we proposed a project in this course, based on educational robotics and educational cooper

Química Nova. Publicado em: 2022

11. Numerical formulation for nonlinear analysis of concrete and steel shells with deformable connections

Abstract A two-dimensional interface finite element capable of associating flat shell elements positioned one above the other was developed. The implemented interface element can physically simulate the contact between the flat shell elements and connect the reference planes of the shell elements above and below it. The formulation presented allows considera

REM, Int. Eng. J.. Publicado em: 2021-09

12. Study of the interaction of concrete walls with the foundation structure

Abstract This article presents a study of the factors that influence the mechanism of soil-structure interaction with a pilot building having concrete walls and their impact on their performance. To illustrate the studies carried out, a numerical modeling of a four-floor concrete wall pilot building was performed, subjected to vertical actions, supported by

REM, Int. Eng. J.. Publicado em: 2021-06