Search

Starting from the context of the principles of Sustainable Development and Circular Economy concepts, the paper presents a synthesis of research in the field of the development of materials of interest, such as cementitious composites or alkali-activated geopolymers. Based on the reviewed literature, the influence of compositional or technological factors on the physical-mechanical performance, self-healing capacity and biocidal capacity obtained was analyzed. The inclusion of TiO2 nanoparticles in the matrix increase the performances of cementitious composites, producing a self-cleaning capacity and an anti-microbial biocidal mechanism. As an alternative, the self-cleaning capacity can be achieved through geopolymerization, which provides a similar biocidal mechanism. The results of the research carried out indicate the real and growing interest for the development of these materials but also the existence of some elements still controversial or insufficiently analyzed, therefore concluding the need for further research in these areas. The scientific contribution of this study consists of bringing together two apparently distinct research directions in order to identify convergent points, to create a favorable framework for the development of an area of research little addressed so far, namely, the development of innovative building materials by combining improved performance with the possibility of reducing environmental impact, awareness and implementation of the concept of a Circular Economy. [ABSTRACT FROM AUTHOR]

The use of waste from industrial activities is of particular importance for environmental protection. Fly ash has a high potential in the production of construction materials. In the present study, the use of fly ash in the production of geopolymer paste and the effect of Fe2O3, MgO and molarity of NaOH solution on the mechanical strength of geopolymer paste are presented. Samples resulting from the heat treatment of the geopolymer paste were subjected to mechanical tests and SEM, EDS and XRD analyses. Samples were obtained using 6 molar and 8 molar NaOH solution with and without the addition of Fe2O3 and MgO. Samples obtained using a 6 molar NaOH solution where Fe2O3 and MgO were added had higher mechanical strengths compared to the other samples. [ABSTRACT FROM AUTHOR]

Sustainable building development involves the use of environmentally friendly materials to reduce carbon footprint, energy consumption and costs. This paper presents natural, customary and innovative materials used in construction. Breathe brick used to filter air from existing pollutants into the atmosphere, Ferrock concrete absorbing carbon dioxide from the atmosphere, nanoparticle thermal insulating materials and metamaterials used in acoustic insulation are future solutions for sustainable development. [ABSTRACT FROM AUTHOR]

The electrodeposition of Zn-Ni alloy was performed on different substrates and by different deposition techniques. The corrosion behavior was investigated in 1% NaCl electrolyte by potentiodynamic and electrochemical impedance spectroscopy. The corrosion resistance of the coatings depends on the deposition technique and substrate used. [ABSTRACT FROM AUTHOR]

The Zn layer was electrodeposited on various substrates by using various electrodepositing methods. The layers corrosion behavior in 1% NaCl solution was measured by potentiodynamic method and by electrochemical impedance spectroscopy method. The coatings corrosion resistance is influenced both on the depositing method and on the substrate nature, respectively. [ABSTRACT FROM AUTHOR]