The construction industry's continuous quest for sustainable practices has led to the exploration of alternative construction materials that minimize environmental impact while maintaining structural integrity. Aggregate constitutes the major part of any concrete construction. Conventional aggregates are obtained directly from nature. The major problem associated with conventional aggregates is the depletion of resources. The project work describes the utilization of industrial slag which is dumped as landfill. Slag, a byproduct of various industrial processes, have emerged as promising candidates for use as construction aggregates in concrete. This study explores the feasibility of replacing traditional coarse aggregates with slag. This project aims to investigate the performance and feasibility of incorporating different types of slags, including Copper Slag (CS), and Steel Slag (GGBS), as raw material and alkaline solution as binding material in the manufacture of coarse aggregate. Through laboratory testing, mechanical properties analysis, and environmental assessments, the study seeks to provide valuable insights into the development of eco-friendly and high-performance coarse aggregate for the production of concrete. The results of the manufactured aggregate shows that the properties tested are nearer to the aggregate properties suggested by Indian standards (IS 456- 2000, IS 383, and IS 9103-1999). The study also focuses on the effect of curing temperature to enhance the properties of the manufactured aggregates in the Phase-II of the project.

Keywords: Conventional Aggregate, Copper slag, Ground granulated blast furnace slag (GGBS), Geopolymer, Pelletization

This study investigates the use of Computational Fluid Dynamics (CFD) simulations, employing PyroSim and the Fire Dynamics Simulator (FDS), to analyze fire dynamics in a textile warehouse. The research focuses on modeling a specific fire scenario to assess fire propagation, temperature distribution, smoke movement, and visibility conditions. The results are intended to inform fire safety strategies and evaluate the effectiveness of existing fire prevention measures in such facilities

Keywords: PyroSim, Fire Dynamics Simulator, statistical analysis, fire simulation, warehouse

The increasing demand for sustainable and energy-efficient cooling solutions highlights the potential of ice-slurry systems due to their high latent heat capacity and superior cooling performance. Integrating these systems with renewable energy sources, such as solar and wind power, further enhances their efficiency and sustainability. This study explores the theoretical principles, mathematical modeling, numerical simulations, and experimental validation of ice-slurry air conditioning powered by renewables. Additionally, it provides a detailed analysis of photovoltaic and wind energy utilization in conjunction with ice-slurry cooling. Findings demonstrate that this integration significantly reduces operational costs and carbon footprint while ensuring reliable and efficient thermal management in commercial and industrial buildings.

Keywords: Ice-Slurry, Energy Storage, Renewable Energy

The paper presents the importance and approach of sustainability, with particularization for the construction works. A way of determining by score and qualitative appreciation of sustainability is provided.

Keywords: sustainability, installations, construction

This paper analyses a thunderstorm downburst record measured by a monitoring system installed on a 50 m high telecommunication lattice tower. The structure is located in the suburbs of Afumați, Ilfov County, approximately 15 km from Bucharest, the capital city of Romania. The monitoring system was developed under the SEVAST research project which aims at identifying the full-scale behaviour of a telecommunication lattice tower subjected to synoptic and non-synoptic winds. Since its implementation, the system has captured more than 10 thunderstorms. In this paper, the statistical parameters of the wind velocity measured during a thunderstorm downburst measured on May 7th 2024 are evaluated.

Keywords: thunderstorm downburst, full-scale monitoring, lattice tower, wind

The paper presents the political, economic, and social trends pertaining to water demand, extraction, and management in the EU countries and beyond, alongside the measures taken by the Romanian government to align with EU policies. Information sourced from international organizations, research, and documents from European and national agencies has been synthesized. In the current context of globalization, as the global population continues to increase, the demand for food and water is anticipated to escalate, precipitating instability, poverty, and the globalization of insecurity. Hence, there is a pressing need to heighten focus on the efficient utilization, conservation, pollution mitigation of water sources, and augmenting their reuse percentage.

Keywords: potable water, issue, globalization

Asigurarea conservării energiei termice în casele tradiționale de locuit pe timp de iarnă în localitățile rurale din Republica Moldova constituie o problemă actuală pe motiv ce prețurile la resursele de creare a energiei termice sunt în permanentă creștere. Progresele din industria construcțiilor indică o schimbare spre eficiență energetică cu consum minim sau chiar aproape de zero. Autorii își propun să efectueze o analiză amănunțită a tehnologiilor și metodelor actuale care vizează sporirea eficienței energetice a caselor tradiționale de locuit, respectând principiile de sustenabilitate. Studiul își propune analiza materialelor de izolare termică a pereților și recomandarea de soluții practice, care să contribuie la promovarea locuințelor tradiționale eficiente din punct de vedere energetic.

Cuvinte Cheie: energie termală, casă tradițională, sustenabilitate

The conservation of thermal energy in traditional winter homes in rural areas of the Republic of Moldova represents a current challenge due to the sustained increase in the prices of thermal energy resources. The construction industry is witnessing a shift towards greater energy efficiency, with minimal or even near-zero consumption. The main aim of this study is to conduct a comprehensive examination of current technologies and methodologies designed to enhance the energy efficiency of traditional residential structures while adhering to sustainability principles. The authors aim to carry out the analysis of thermal insulation materials for walls and to recommend practical solutions to help promote traditional energy-efficient housing.

Keywords: thermal energy, traditional house, sustainability

În această lucrare, este prezentată opinia noastră cu privire la "Cum vedem schimbările climatice în refrigerare", axată pe studiul comparativ al agenților frigorifici. Decarbonizarea este obiectivul UE până în 2050. Reducerea emisiilor de dioxid de carbon prin utilizarea surselor de energie cu emisii reduse de carbon, este un obiectiv important, ceea ce duce la o producție mai mică de gaze cu efect de seră în atmosferă.

Cuvinte Cheie: decarbonizare, schimbări climatice, seră

In this paper, is presented our opinion regarding „How do we see Climate Changes in Refrigeration” focussed by comparative study of refrigerants. Decarbonization is the goal of EU by 2050. Reduction of carbon dioxide emissions by using low-carbon energy sources, resulting in less production of greenhouse gases in the atmosphere is an important target.

Keywords: decarbonization, climate changes, greenhouse

The rising interest in absorption cycles for refrigeration and air conditioning systems is driven by their significant benefits in reducing carbon emissions. Among these cycles, the NH3/H2O absorption cycle is particularly appealing. This paper provides a comprehensive overview of the system process, simulation methodology, and mathematical NH3/H2O cycle model, including a detailed description of the modeling technique.

Keywords: absortion cycle, carbon emissions

The present work seeks to establish some practical working relationships for determining the values of overall heat transfer coefficient, k, related to plate heat exchangers. This problem is experimentally solved by the manufacturers of such heat exchangers in the world, so our work has more of an educational-research character, which can serve to some users of plate heat exchangers in district heating systems or indoor central heating installations.

Keywords: plate heat exchanger, overall heat transfer coefficient

Spre deosebire de majoritatea rețetelor de fabricare a materialelor geopolimerice conținând cenușă zburătoare, lucrarea curentă a adoptat asocierea cărămizii de argilă și beton rezultate din demolarea clădirilor împreună cu metacaolin și zgură de furnal, ca materiale cu proprietăți de cementare și pozzolanice adecvate pentru înlocuirea cimentului Portland extrem de poluant. Exceptând compoziția originală a amestecului material, autorii au adoptat propriul lor regim de întărire a pastei proaspete la 80 ℃ pentru 24 ore, urmat de tradiționala stocare la temperatura ambiantă pentru 7-28 zile. Proprietățile cărămizii geopolimerice au fost excelente prin corelarea adecvată a caracteristicilor mecanice și fizice.

Cuvinte Cheie: demolarea clădirii, metacaolin, zgură de furnal, deșeu de beton, cărămidă geopolimerică.

Unlike most manufacturing recipes of geopolymer materials containing fly ash, the current work adopted the association of clay brick and concrete resulting from building demolition together with metakaolin and blast furnace slag as materials with cementitious and pozzolanic properties suitable for substituting the extreme pollutant-Portland cement. Except for the original composition of the material mixture, the authors have adopted their own curing regime of fresh pasta at 80 ℃ for 24 hours, followed by traditional storage at room temperature for 7-28 days. Geopolymer brick properties were excellent through the appropriate correlation of mechanical and physical features.

Keywords: building demolition, metakaolin, blast furnace slag, concrete waste, geopolymer brick.