Screwsol este una dintre soluțiile recente de fundare de adancime prin piloți de indesare cu spire de tip „surub”. Sistemul este aplicat cu succes in gama de dimensiuni 330/500 pana la 530/700 mm nu doar in Marea Britanie, Franta, ci si in Europa Centrala si de Est, fiind pe deplin reglementat de standardul EN 12699:2015 [1]. Lucrarea prezinta, prin intermediul a peste 250 de teste de incarcare simple si instrumentate, detalii tehnologice, principii constructive si modul de alegere a dimensiunilor, domeniile de aplicare, abordarile de proiectare, precum si evaluarea sustenabilității.

Cuvinte cheie: piloți de indesare, piloți de tip surub, abordare de proiectare, sustenabilitate

Screwsol is one of the recent deep foundation solutions for the “screw” type threaded displacement piling methods. The system is successfully applied in the range 330/500 to 530/700mm not only in Great Britain, France, but also in Central – East Europe, fully covered in by the standard EN 12699:2015. The paper present by means of more than 250 simple and instrumented loading tests the technological details, the constructional principles and the choosing of dimensions, the application possibilities, the design approaches as well as sustainability evaluation.

Keywords: displacement piles; screw piles; design approach; sustainability

The escalating importance of green building practices in tackling environmental challenges necessitates innovative solutions, particularly emphasizing resource conservation, energy efficiency, and occupant well-being. Building Information Modeling (BIM) has emerged as a promising tool to enhance efficiency in construction projects. This sophisticated digital platform enables real-time collaboration and visualization of the construction process. This study aims to explore the potential of BIM in promoting sustainability within smaller-scale building projects. The utilization of Building Information Modeling (BIM) presents a significant opportunity to enhance the design of green buildings. By integrating BIM with building rating systems, architects can ensure that their structures meet the necessary standards for green certification. The study focuses on assessing the impact of Building Information Modeling (BIM) on resource efficiency, energy performance, waste reduction, and cooperative decision-making in small-scale green buildings. Results indicate a positive correlation between BIM adoption and various aspects of sustainability, including early-stage design optimization, energy efficiency analysis, material selection, life cycle assessment, waste reduction, and prefabrication using LEED (Leadership in Energy and Environmental Design), BREEAM (Building Research Establishment Environmental Assessment Method). The findings underscore the significance of incorporating BIM into smaller-scale construction projects to promote eco-friendly practices and achieve sustainable outcomes. By leveraging BIM of smart materials, architects and construction professionals can enhance resource efficiency, improve energy performance, reduce waste generation, and facilitate collaborative decision-making throughout the project lifecycle

Keywords: Building Information Modeling (BIM); LEED (Leadership in Energy and Environmental Design); BREEAM (Building Research Establishment Environmental Assessment Method); Green building; Smart Materials;

Nuclear energy is a source of energy that can restore large areas of land in favor of agricultural exploitation. Also, by means of nuclear energy, the required energy for the sanitation and arrangement of unexploitable land surfaces and for feeding irrigation systems can be ensured. The article makes a comparative study between renewable technologies (nuclear, wind and photovoltaic) addressing both classical high-power (LR) and small-scale systems (SMRs) located in electrical energy consumption centres. The study highlights the advantages of nuclear energy in terms of land use, agricultural production, impact on wildlife and finally the possibility of cogeneration.

Keywords: nuclear energy, RES, agricultural surfaces, thermal island

A fost realizata o versiune imbunatatita a betonului geopolimeric fabricat pe baza de cenusa zburatoare si zgura de furnal granulata prin corelatia rezistentei mecanice inalte a materialului intarit cu lucrabilitatea de nivel mediu a materialului proaspat. Raportul cenusa zburatoare/zgura in compozitia liantului inlocuitor al cimentului Portland a fost redus la limita la care lucrabilitatea a fost afectata, dar aceasta reducere a fost compensata de adaosul aditivului fluidizant (lignosulfonat de calciu). Datorita corelației proprietaților mecanice si acelea ale fluidității, au fost obtinute rezistențe inalte la compresie si incovoiere (57,4 și 10,1 MPa) dupa intarire si stocare pentru 28 zile.

Cuvinte cheie: beton geopolimeric, activator alcalin, proces de întărire, lignosulfonat de calciu, rezistență mecanică, lucrabilitate

The improved version of geopolymer concrete manufacturing based on fly ash and granulated blast furnace slag was made by correlating the high mechanical strength of the hardened material with the medium level-workability of the fresh material. The fly ash/slag ratio in the composition of the substitute binder for Portland cement was reduced to the limit where the workability was affected, but this reduction was compensated by fluidizing additive (calcium lignosulfonate) addition. Due to the correlation of mechanical properties and those of fluidity, high compression and flexural strengths were obtained (57.4 and 10.1 MPa) after curing and 28 days-storage.

Keywords: geopolymer concrete, alkaline activator, curing process, calcium lignosulfonate, mechanical strength, workability.

This article examines a partially overturned retaining wall designed to protect the Taher Treasury Administration in Jijel Province, Algeria, from the sliding of the slope on which it is constructed. Although the wall remained intact, it led to the project being suspended by local authorities due to concerns about its stability. Despite several expert assessments, the root cause was not identified, necessitating in-depth analysis. Field investigations revealed unexpected results: the presence of a plastic sheet behind the wall hindered the drainage of rainwater and exacerbated the pressures on the surface layer of the backfill material. In particular, the wall's anchoring proved insufficient, barely affecting the intermediate layer. This configuration was critical for understanding the dynamics of soil pressures leading to superficial and partial sliding, which impacted the retaining wall's stability. Comparisons between field observations and our numerical model highlighted discrepancies in design dimensions and construction practices. Our revised model proposes a larger, deeper, and better-anchored retaining wall configuration, contrasting with the initial designs. This study concludes that errors in both design calculations and construction implementation contributed to the wall's instability, underscoring the importance of meticulous planning and adherence to geotechnical principles in future projects.

Keywords: Diagnosis, partial and superficial sliding, Retaining wall, lateral detachment, overturning, investigations, numerical simulation

In the current climate context regarding the reduction of net greenhouse gas emissions, the article proposes the creation of an ecological fuel obtained from the trimming of Paulownia trees and plant residues (stems and leaves of Sunflower and corn), residues that are not used in other purposes. For the proposed blends (66.66% Paulownia, 16.67% Sunflower and 16.67% Corn) the calorific value was determined and compared to a sample with 100% Paulownia. The results show that for the mixtures obtained, a decrease in calorific value of 37.32% and 29.74% respectively (depending on the humidity of the mixture) was found compared to the Paulownia standard sample (20,000 J/g), but which is close or even higher than that of other commercial mixtures (sample S4-beech+oak-9,482 J/g). right.

Keywords: ecological fuel, biomass residues, recovery, calorific value

Today, the best option - and only one that is feasible - for obtaining sustainable solutions for the responsible use of resources is to approach the energy efficiency of an HVAC system by recognizing and seizing the opportunities offered by automation and optimization seen as a whole, in close connection.

Keywords: geothermal system, heat pumps, sustainability

The paper presents a case study regarding the feasibility of implementing a waste heat recovery system from combustion gases emitted by an electrostatic painting line. Our proposed recovery system aims to bring two main benefits: from an economical point of view, we want to decrease the costs of gas consumption for heating domestic hot water; from a climate and air pollution standpoint, we aim to considerably reduce the amount of combustion gases dumped into the environment, thereby diminishing the greenhouse effect.

Keywords: waste heat recovery, combustion gas, domestic water heating

The acceleration of global climate change, along with its adverse effects on the sustainability of the built environment, is closely linked to rising greenhouse gas emissions and energy consumption. The construction sector, as one of the largest energy consumers, accounts for nearly 40% of total energy usage and carbon dioxide emissions, with heating, ventilation, and air conditioning (HVAC) systems contributing a significant share. Consequently, the development of sustainable materials to enhance the energy efficiency of HVAC systems is critical. Ice cooling, though ancient in origin-dating back 5,000 years to the use of ice blocks for food preservation-offers modern opportunities for sustainable cooling solutions. With dwindling natural resources and a growing emphasis on environmentally friendly technologies, there is renewed interest in cooling methods that maximize performance while minimizing ecological impact. This paper presents a detailed analysis of water-ice air conditioning systems, discussing their theoretical principles, mathematical models for heat transfer, numerical simulations applied to a hypothetical case, and validation through experimental and theoretical data. Simulations and calculations for a water-ice mixture air conditioning system demonstrate its capability to effectively cool large areas for extended periods, significantly reducing energy consumption. The validation of results confirms that this system is well-founded and represents a viable solution for commercial and industrial buildings requiring efficient and environmentally friendly climate control.

Keywords: climate, greenhouse, HVAC

Lucrarea are ca obiectiv o analiza asupra reglajului efectuat asupra puterii electrice absorbite de pompa de caldura pentru asigurarea reglajului termic al instalatiei de incalzire centrala. S-a considerat situatia in care pompa de caldura este singura sursa care alimenteaza instalatia de incalzire. Pompa de caldura, se impune in consecinta sa fie dimensionata a avea capacitatea de a acoperii necesarul de incalzire de calcul al consumatorului. Se prezinta in cadrul lucrarii Importanta pincipiului de dimensionare al instalatiei de incalzire : instalatie de temperatura ridicata, temperatura medie si temperatura joasa. Se remerca si importanta zonei climatice asupra capacitatii pompei de caldura.

Cuvinte cheie: pompă de căldură, reglaj termic

The objective of the work is an analysis of the adjustment performed on the electric power absorbed by the heat pump to ensure the thermal regulation of the central heating installation. The situation in which the heat pump is the only source that supplies the heating system was considered. The heat pump must therefore be sized to have the capacity to cover the consumer's calculated heating needs. It is presented in the work the importance of the dimensioning principle of the heating system: high temperature, medium temperature, and low temperature heating systems. The importance of the climatic zone on the capacity of the heat pump is also required.

Keywords: heat pump, thermal adjustment

Photovoltaic energy represents an outstanding solution for combating climate change and promoting sustainable development, offering benefits such as extensibility and clean energy source. Its integration into buildings as a vital component in modern architecture and sustainable construction has multiple advantages, from saving materials to generating sustainable energy and reducing dependence on fossil fuels. However, the high initial cost and dependence on sunlight are important disadvantages, but using innovative technologies and creative approaches, photovoltaic energy can play an essential role in ensuring a sustainable future and providing functional, aesthetic and sustainable building facades. The case study proposes the modernization of an existing building by installing photovoltaic panels on the western facade and on the roof, thus resulting in an annual electricity production of 16.73 MWh.

Keywords: photovoltaic panels, architecture, solar energy, energetic efficiency

This comprehensive study investigates the influence of air conditioning (AC) systems on aerosol dispersion within Intensive Care Units (ICUs), emphasizing the critical context of patient cough events. This research uses advanced Computational Fluid Dynamics (CFD) simulations to analyze airflow patterns, aerosol behavior, and potential exposure risks within ICU settings, offering valuable insights for healthcare facility design and infection control protocols.

Keywords: Aerosol Dispersion, ICU Airflow Patterns, CFD Simulation.

O nouă variantă a compoziției betonului geopolimeric incluzând agregat reciclat din demolarea clădirilor a fost testată în acest experiment. Au fost încercate diferite proporții masice împreună cu agregatul natural (nisip de râu) și au fost efectuate determinări ale caracteristicilor mecanice și fizice ale geopolimerului. În condițiile în care principalul efect al adăugării agregatului reciclat a fost creșterea rezistențelor la compresiune și încovoiere, în timp ce celelalte caracteristici au scăzut, soluția adoptată a fost corelația corespunzătoare a valorilor caracteristicilor pentru a obține un produs cu proprietăți optime (varianta 3): 2105 kg·m-3-densitatea, 4,3 %-absorbția apei, 54,9 MPa-rezistența la compresiune, 9,2 MPa-rezistența la încovoiere, și 22,9 GPa-modulul de elasticitate.

Cuvinte cheie: beton geopolimeric, agregat reciclat, demolarea clădirii, zgură granulată de furnal, rezistența la compresiune

. A new version of the geopolymer concrete composition including recycled aggregate from the demolition of buildings as fine aggregate was tested in this experiment. Different weight proportions were tried together with the natural aggregate (river sand) and determinations of mechanical and physical characteristics of the geopolymer were carried out. Given that the main effect of the recycled aggregate addition was increasing compressive and flexural strengths, while the other characteristics decreased, the solution adopted was corresponding correlation of characteristic values to obtain a product with optimal properties (version 3): 2105 kg·m-3-density, 4.3 %-water-absorbing, 54.9 MPa-compressive strength, 9.2 MPa-flexural strength, and 22.9 GPa-elasticity modulus.

Keywords: geopolymer concrete, recycled aggregate, building demolition, granulated blast furnace slag, compressive strength