This study presents a new waste treatment strategy by dealkalizing red mud with simulated aluminum profile wastewater. We investigate the leaching behavior and the effect of the wastewater dropping rate. During dealkalization, the slurry pH significantly decreases while conductivity increases, indicating efficient dealkalization. The increase in Na⁺ in the filtrate and the decrease in Na₂O in the residue confirm the dissolution of alkali, especially structural alkali. The dealkalization efficiency reaches 64.4%. Increasing the dropping rate accelerates the reaction, enhancing efficiency without altering the process. The mechanism involves Al³⁺ combining with hydrolyzed AlO₂⁻ to precipitate Al(OH)₃, effectively removing structural alkali, which is the main restrictive factor in red mud. After dealkalization, the utilization rate of red mud increases from 5% to 15%, positively impacting economic and environmental aspects, particularly land occupation, soil salinization, and human health.
Engineering (General). Civil engineering (General), Building construction
Hesham Algassim, Samad M. E. Sepasgozar, Michael J. Ostwald
et al.
Despite some high-profile exceptions, the architecture service industry has typically adopted new digital technologies slowly. Previous research has examined the influence of user-friendliness and ease of technology use to explain the slow adoption rate, but contextual factors associated with the operations of architectural organizations—such as result demonstrability, training needs, cost factors, environmental expectations, project factors, and client satisfaction—have been largely overlooked. This paper presents a novel architectural technology adoption model (ATAM) encompassing multiple architecture-service-specific factors and their relationships. The key hypotheses embodied in ATAM are that the digital technology adoption process is shaped by industry-specific factors that directly affect perceived usefulness and perceived ease of use by architects and, subsequently, their intention to employ the technology. Furthermore, the impacts of user satisfaction, user behavior, and client satisfaction on technology acceptance are examined. This paper describes the development of an ATAM, drawing on a set of original data collected from 452 participants from a case study country (Saudi Arabia). The ATAM is then validated through extensive hypothesis testing performed using maximum likelihood structural equation modeling in AMOS. The outcomes show that result demonstrability, training needs, cost factors, environmental expectations, project factors, and client satisfaction are significant factors affecting technology adoption. The development of the ATAM addresses the lack of empirical knowledge about technology adoption in architecture. The ATAM offers a novel and rigorous approach to helping organizations understand and overcome the factors that affect technology adoption in the architecture service sector. Fundamentally, the ATAM supports a new understanding of the factors that are critical for organizations to increase user and client satisfaction with technology adoption. The ATAM contributes to the literature on architectural innovation, but it can be modified and replicated in various sectors associated with architectural services where clients’ satisfaction is critical.
Abstract Metakaolin-based geopolymers, which are emerging as a novel and eco-friendly construction material, have garnered significant attention in recent years. This study employs bibliometric techniques to systematically analyze 1,553 relevant publications from the Web of Science database, with the goal of identifying research hotspots and trends over the period from 2003 to 2023 in this field. The findings reveal a pronounced growth trend in the annual publication volume of metakaolin-based geopolymers, particularly entering a phase of accelerated development after 2019. China emerges as the leading country in research output, establishing a close collaborative network with countries such as the USA, Italy, France, and Brazil. Institutions like the University of Modena and Reggio Emilia have demonstrated exceptional performance in this field.Cristina Leonelli boasts the highest publication output, while authors such as Joseph Davidovits and Peter Duxson have made significant contributions, providing valuable theoretical and practical guidance for subsequent research. The journal Construction and Building Materials has been identified as a core publication in this field. Keyword analysis reveals that research hotspots include raw material optimization, synthesis mechanisms, mechanical properties, durability, and environmental applications. The evolution of research hotspots in metakaolin-based geopolymers has progressed through three distinct stages: fundamental exploration, performance enhancement, and application expansion. Through a multidimensional analysis, this study systematically organizes the knowledge structure and development trends in metakaolin-based geopolymer research. It offers macro-level insights for related researchers and provides directions and ideas for future research.
In the introduction, we discuss the need for a material transition in architecture and construction and the challenges it poses. Drawing on innovation research, the multi-level perspective (MLP), and thousands of years of building history, we identify the potential for change, the obstacles that need to be overcome, and the importance of standards, in particular of established industry standards. The introduction also includes a brief description of each article.
Victor ADIR, Nicoleta Elisabeta PASCU, George ADIR
et al.
This paper has tried to explain the importance of the general and special principles in logo design. The study was realized on a lot of logos to understand when a designer could use the principles to create wonderful graphic representations. It is about symmetry, asymmetry, proportion, rhythm and harmony, substitution, juxtaposition, using different geometric shapes, lines, curves, silhouettes and stylizations, mirror and illustrative representation and so on. We have explained how to use graphic representations in some fields of activity and to choose the best symbol for a company/university etc. And, of course, it was a significant part about the redesign working. This paper presents a few interpretations and conclusions concerning the design principles applied for logos.
Architectural engineering. Structural engineering of buildings, Engineering design
Younouss Dıéye, Vincent Sambou, Pape Moussa Touré
et al.
This work deals with characterizing concrete based on baobab trunk fibers for thermal in- sulation in buildings. The aim is to study the effect of the fiber content and the type of fiber treatment on the hygroscopic and thermo-physical properties of the concrete. Therefore, two types of treatment were carried out: an alkaline treatment and a thermo-alkaline treatment. Hygroscopic test results (34.25% to 54.92% for fiber content ranging from 14% to 28%) show that adding fibers to concrete makes them more sensitive to water. However, thermochemical treatment of the fibers reduces this water sensitivity. The thermal conductivities of concrete range from 0.202 to 0.086 W/m.K for the same fiber content. These results show that these biomaterials can be used in construction to improve building insulation.
Materials of engineering and construction. Mechanics of materials, Building construction
This research aims to analyze the development of Guided inquiry-based cladistic worksheet websites in high schools through that website that has already been developed. The research subjects were 36 students of class X at one of the high schools in Bandung. The research was used by using the experimental method. Students were given Guided inquiry-based cladistic worksheet websites. The instrument used was a Guided inquiry-based cladistic worksheet website, a Feasibility Test by expert lecturers, and a critical thinking test. Critical thinking skill use indicators are Simple Explanation, Conclude, Strategy and Tactics, Building basic skills, Make further explanations. The data were analyzed by using the paired sample T-test. The results showed that the cladistic worksheets based on guided inquiry were valid and effective (N-Gain= 0.54). The assessment analysis by the expert judgment was found to be feasible to be tested in the field without revision, besides that Guided inquiry-based cladistic e-worksheets after validation tests by expert lecturers were obtained from various aspects, such as the application of Guided inquiry to 100% cladistic e-worksheets, practical analysis obtained 91.6%, competency aspect analysis of 91.6%, knowledge construction, obtained a value of 80 and conformity or relevance to KD 100%. It can be concluded that the development of this media can improve students’ critical thinking skills.