1. Analysis of carbonation and hydration of BOF steel slag for application as railway ballast

Abstract The reutilization of waste is a valuable alternative for the preservation of natural resources and the environment. In this sense, Basic Oxygen Furnace (BOF) steel slag is one of the most residues generated in steel the industry. It is estimated that for each ton of steel produced, about 150 kg of steel slag is generated in the BOF process. Generall

REM, Int. Eng. J.. Publicado em: 2020-12

2. Estudo experimental do fluxo de umidade em argamassas de cal aérea

RESUMO Uma parte significativa do património histórico construído ao redor do mundo é constituída de alvenaria estrutural, com juntas preenchidas com argamassa. Nesses sistemas estruturais, a argamassa usualmente representa uma parcela pequena/moderada do volume total da estrutura, no entanto, a argamassa é reconhecida como a principal fonte de movimen

Matéria (Rio J.). Publicado em: 25/11/2019

3. Propriedades mecânicas e análise microestrutural de um concreto produzido com agregado da região Amazônica brasileira

RESUMO Em virtude da escassez de agregado em algumas regiões na Amazônia, o presente trabalho tem como objetivo, avaliar as propriedades de concretos produzidos com agregado proveniente do leito do rio Oiapoque. Fazendo um estudo comparativo relacionando as características entre os agregados graúdos utilizados na construção civil, em especial o materia

Matéria (Rio J.). Publicado em: 25/11/2019

4. Kinetics of the Carbonation Reaction of Lithium Orthosilicate Using a Typical CO2 Concentration of Combustion Gases

The aim of this work was to investigate the carbonation kinetics of lithium orthosilicate (Li4SiO4) by thermogravimetry and via thermodynamic simulations, using CO2 concentrations of 15 vol.% (typical of combustion gases) and 100 vol.%. Tests were performed in a thermogravimetric analyzer, in two sequential steps: (1) pre-treatment at 750 ºC with N2 and (2)

Mat. Res.. Publicado em: 05/09/2019

5. Durability of Concrete After Fire Through Accelerated Carbonation Tests

Degradation of mechanical properties and durability of reinforced concrete structures occur when they are subjected to fire situations, depending on the characteristics of the material, fire duration and the ways of fire extinguishing. Mechanical properties such as compressive strength, tensile strength and elasticity modulus are some examples of typically a

Mat. Res.. Publicado em: 18/07/2019

6. Evaluation of reinforced concrete structural durability in the post-occupation phase - A case study in Novo Hamburgo/RS

Abstract Researches on building performance have been developed over time. The Brazilian Performance Standard - NBR 15575 - deals with the issues of durability applied to residential buildings, establishing criteria and parameters to classify the systems into minimum, intermediate and higher performance levels. In relation to the service life, studies are al

REM, Int. Eng. J.. Publicado em: 2019-03

7. Behaviour of cementitious matrices subjected to the combined action of chloride ions and carbonation

ABSTRACT Carbonation and chloride action are the two leading causes of degradation in reinforced concrete structures. Despite the combined action of these two mechanisms being a reality, there is little research on the effect of this combination in cementitious matrices. Furthermore, the incorporation of fly ash in cementitious matrices has been frequently u

Matéria (Rio J.). Publicado em: 18/10/2018

8. Efeito da adição de fibras híbridas na durabilidade de compósitos cimentícios avançados em ambientes úmidos e agressivos

ABSTRACT Reactive powder concrete (RPC) is one type of advanced cementitious composite that has been increasingly used. Its high mechanical strength enables the application of the composite in bolder structures. Considering its recent history of use, there is a lack of knowledge about this materials durability. Therefore, this paper aimed to evaluate the beh

Matéria (Rio J.). Publicado em: 18/10/2018

9. Monitoring reinforcement corrosion of concretes designed for nuclear facilitie

ABSTRACT The facilities designed for the peaceful activities of nuclear energy are made with different materials, among them, reinforced concrete. This material, in addition to being structural, is a barrier for isolation and confinement from the environment of the radioactive materials. One of its degradation mechanisms is the corrosion of the reinforcement

Matéria (Rio J.). Publicado em: 19/07/2018

10. FIXAÇÃO DE CO2 EM EFLUENTE SALINO DE INDÚSTRIA PETROQUÍMICA

In various industrial processes, such as the process of obtaining potassium by solution mining or in the oil industry, fuels are burnt concurrently to the formation of saline effluents. The opportunity to sequester carbon through capturing the CO2 from the flue gas by carbonation of these effluents and reducing the potential of scaling of the water is eviden

Quím. Nova. Publicado em: 2017-08

11. THE USE OF A HIGH LIMESTONE CONTENT MINING WASTE AS A SORBENT FOR CO2 CAPTURE

Abstract In this work, a high limestone content waste was evaluated as a potential material for CO2 capture. The influence of calcination conditions on the CO2 capture capacity was evaluated using 5 cycles of calcination-hydration-carbonation reactions. A Central Composite Design of Experiments was set using calcination temperatures and time as variables. Th

Braz. J. Chem. Eng.. Publicado em: 2016-09

12. EFFECT OF SORBENT PORE VOLUME ON THE CARBONATION REACTION OF LIME WITH CO2

Abstract The reaction of calcium oxide with carbon dioxide is one of the most important methods for the capture and concentration of greenhouse gas from the flue gases of industrial plants. In this work, the carbonation reaction of CaO obtained from various sources with CO2 was investigated by a thermogravimetric method. These sources include commercial lime

Braz. J. Chem. Eng.. Publicado em: 2016-06