In recent decades, alkali activated and blended cements have attracted great interest worldwide due to their advantages of low energy cost, high strength, and good durability. This study evaluated the effects of replacing 50% of Portland cement with a mixture of three waste materials: ground granulated blast furnace slag (GGBFS), fly ash (FA), and geothermal waste (GS), with and without external alkaline activation, and activated with different alkali agents: 4 and 7% Na₂O equivalent of sodium hydroxide, sodium silicate (water glass), and sodium sulfate. After 90 days of curing, samples were characterized using compressive strength tests, scanning electron microscopy, X-ray diffraction, and thermogravimetric analyses. The results showed that sodium hydroxide caused an alkali–silica reaction and reduced the strength, while sodium silicate and sodium sulfate improved the strength and hydration products formation. Moreover, the addition of fly ash decreased the compressive strength but increased the workability, while the addition of slag and geothermal waste increased strength and densified the matrix with the formation of additional hydration products. The blended cements without activation also showed better performance than pure cement and a more compact matrix of hydration products. The study demonstrated the feasibility of using waste materials to produce blended cements with low energy costs and high durability.

This article presents a comprehensive analysis of construction and demolition waste (C&D waste) management in European Union (EU) Member States. The study utilizes official data and reports to assess the current C&D waste management status, revealing substantial disparities in recycling rates across countries, ranging from 100% to 24%. These variations emphasize the importance of knowledge sharing and collaborative efforts to improve C&D waste practices. The paper explores the complex factors influencing C&D waste management performance, offering a nuanced discussion of these dynamics. It provides a comprehensive set of practical strategies to address existing challenges, with a focus on reducing C&D waste sent to landfills or incineration. These recommendations align with the EU’s commitment to sustainable resource management and the transition to a circular economy. The research’s informed measures, driven by environmental responsibility and economic prudence, can significantly diminish C&D waste’s environmental impact. Policymakers, environmentalists, and industry stakeholders can utilize these findings to develop and implement improved C&D waste management practices, promoting sustainability and resource efficiency across the EU. This research contributes valuable insights to the field of C&D waste management, offering a road map for improvement and highlighting the need for collaboration among EU Member States to create a more sustainable and resilient future.

This article explores how the construction sector can significantly contribute to minimizing its environmental impact through reuse and recycling practices, in rehabilitation or new construction projects. This research focuses on implementing BIM methodology alongside biomaterials, 3D modeling, and digitization in compliance with the Green Building Code. Two case studies located in Jalisco and Querétaro (Mexico) are examined through a comparative analysis. The simulations are carried out in different geographical areas with two construction systems that allow us to see the output similarities. The results show the clear advantages of biomaterials over traditional materials such as concrete. The construction materials are shown to determine their operational energy consumption. From an economic point of view, this study supports data regarding lower energy costs, and a significant reduction in CO₂ emissions is observed. In conclusion, both the models and simulations, along with the Toolkit, highlight the benefits of biomaterials over conventional industrial materials.

This perspective analysis aims to show the most recent and relevant interventions in a representative sample of selected European railway stations, balancing different criteria by reviewing the most characteristic cases. We analyse its impact at the urban level, assessing whether there is urban regeneration and to what extent; its impact at a functional level, assessing the change in activity as well as the effect on the user, transfer, or dismantling of the railway activity; its impact at an architectural level, assessing whether the actions are global or merely at the level of facade. As a final reflection, we outline the issue of the possibility of reuse in historical railway stations associating it with heritage preservation. The proposed selection contemplates actions in small and large stations and locations; total, partial, and zero dismantling actions in the tracks or the station plot and, finally, new uses ranging from the mixed solution of railway activity and shopping centre to cultural or exclusively leisure solutions. The timeline covers approximately the last three decades (1985–2022).

Urban mobility makes it possible to incorporate new perspectives that make it possible to question and problematize the way in which social links and relations between city dwellers are shaped. In this way, mobility constitutes an increasingly massive, recurrent, and complex social practice, strongly conditioned by the existing levels of inequality and particularly those that entail processes of social exclusion. In the present research, the efficiency of the modality of adapted public transportation for people with disabilities in the city of León, Guanajuato, Mexico, which came into operation in 2012, receiving the 2019 Building Equality Award from the International Center for the Promotion of Human Rights and United Nations Educational, Scientific and Cultural Organization (UNESCO), is analyzed. The management, design, and implementation of Inclusive Urban Transportation (TÜI), demonstrated how the articulation of actors (public, private, and civil society) are of vital importance for the success of the project. In this sense, it is important to count on the permanent participation of focus groups that identify and understand the real needs of users with reduced mobility. The results achieved allow establishing an evaluation that contributes to detect and mitigate the conditions of vulnerability, risk, and segregation of people with disabilities.

The construction and demolition sectors are among the world’s most critical activities, generating large amounts of waste. Thus, these sectors’ waste accumulation problem is related to the environmental protection system and proper waste management. On the other hand, it is well known that proper waste disposal can increase its value. In this way, the economic potential of the trash can be raised again. Therefore, this article will examine the economic potential of construction and demolition (C & D) waste. Different waste management processes will be analyzed to better understand the topic from a financial perspective in this area underway in Spain. Therefore, data from other regions of Spain were collected. This data led to results where the most expensive rooms were Pais Vasco and the Balearic Islands, where disposal of C & D waste had the highest prices, exceeding EUR 30 per ton. Conversely, the lowest prices are found in regions such as Navarre and Andalusia, where prices per ton are EUR 8 and EUR 6, respectively. The values show a direct relationship between the treatment price and the amount of C & D waste disposed of. Therefore, this article will look at different factors influencing sustainable waste management. Such activities have a positive impact, as waste needs to be recycled and reevaluated by waste management operators. The cost of construction waste is an integral part of the budget because it represents the monetary value of the cost of collecting and recycling construction waste. Construction waste is an essential resource for economic and social development, as it contributes to job creation, education and culture, and the protection and preservation of the environment.