por Taiwo Ezekiel Adebakin en 30 de abril de 2026 a las 00:00
This study examines the drivers and challenges/barriers faced by built-environment professionals in applying circular economy (CE) principles within Maiduguri, Nigeria’s housing delivery system, a city recovering from prolonged conflict. Using a mixed-method approach, including a literature review, an interview and a questionnaire administered to construction professionals (n = 188), the research assesses awareness and practical implementation. Key drivers for CE adoption include regulatory incentives, increased research funding, potential cost savings, and rising environmental awareness. Major barriers, however, consist of limited technical expertise, weak policy enforcement, and financial constraints. The analysis also reveals significant gaps in on-site waste management and resource recovery practices. To address these issues, this study recommends targeted capacity-building programmes, stronger policy frameworks, and enhanced multi-stakeholder collaboration. Small and Medium Enterprises (SMEs) should be supported to venture into engineering waste recycling and management. These measures aim to promote core CE practices, such as waste minimisation, reuse, recycling, and remanufacturing within the construction industry, aligned with Sustainable Development Goal (SDG) 11 (Sustainable Cities and Communities). The research concludes that integrating CE strategies can foster sustainable housing development in Maiduguri, supporting environmental protection, socio-economic growth, and increased resilience of the built environment in post-conflict contexts.
por Zhoucong Xu en 30 de abril de 2026 a las 00:00
The sustainable utilization of multiple reclaimed pavement materials is a critical pathway toward green highway construction. This study investigates the performance and synergistic mechanisms of cold-recycled mixtures incorporating both Reclaimed Asphalt Pavement (RAP) and Reclaimed Cement-Stabilized Base (RCSB), using emulsified asphalt as the primary binder. A comprehensive experimental program was conducted to evaluate the effects of reclaimed material proportions, mixing sequences, and curing ages on the mechanical strength, moisture susceptibility, and high-temperature stability of the mixtures. Microscopic characterization via Scanning Electron Microscope (SEM) and Energy Dispersive Spectroscopy (EDS) were employed to elucidate the Interfacial Transition Zone (ITZ) evolution. Results indicate that an optimal RCSB incorporation range of 20–40% establishes a robust “stone-to-stone” rigid skeleton, significantly enhancing the splitting strength (up to 0.87 MPa) and durability (Splitting Strength Ratio, TSR > 91%). SEM observations confirm the formation of a dense interpenetrating network structure within this range, where cement hydration products and asphalt films achieve optimal chemo-physical bonding. Exceeding 40% RCSB leads to a moisture-starved state and a sharp decline in dynamic stability due to insufficient binder coating. Micro-morphological characterization reveals that the transition from macro-interfacial debonding to a robust cohesive failure mode is the fundamental driver for the performance peak at 20–40% RCSB. SEM observations confirm the formation of a dense interpenetrating network structure, where cement hydration products successfully anchor into the asphalt film. This optimized ITZ effectively eliminates the stress concentration and aggregate crushing seen in high-RAP mixtures, thereby ensuring superior mechanical integrity. Furthermore, a pre-wetting mixing sequence ensures a high-energy mineral surface that promotes the heterogeneous nucleation of cement. SEM results show that this prevents the competitive adsorption between cement and asphalt, transforming the ITZ from a friable, loose state into a densified crystalline adhesive matrix.
por Rubiyatno Rubiyatno en 29 de abril de 2026 a las 00:00
This study aims to analyse the influence of sustainability knowledge on sustainable lifestyles with attitudes toward sustainability as a mediating variable, within the framework of Stimulus–Organism–Response (SOR). The study respondents were 311 tourism managers in Yogyakarta with various destinations who were selected using non-probability sampling techniques due to limited population access and the specific needs of subjects relevant to sustainability issues. The data analysis uses Structural Equation Modelling–Partial Least Squares (SEM-PLS) with Smart PLS. The results of the study show that sustainability knowledge directly affects sustainable lifestyles; in addition, attitudes towards sustainability partially mediate the influence of sustainability knowledge on sustainable lifestyles. Sustainability knowledge is seen as an external stimulus that influences positive attitudes towards sustainability, which then drives a response in the form of adopting a sustainable lifestyle. Although knowledge is often assumed to directly influence behaviour, theoretical and empirical findings suggest that attitudes play an important role as mediators that bridge knowledge with real behaviour. Other results show that sustainable awareness does not directly affect a sustainable lifestyle. Attitude toward sustainability plays a mediating role in the influence of sustainable awareness on sustainable lifestyles. Individuals or tourism managers who have a deep awareness of environmental, social, and economic issues tend to internalise sustainability values, form positive attitudes, and ultimately adopt sustainable lifestyles. This research is expected to make a theoretical contribution by strengthening the application of the SOR framework in sustainable tourism, as well as a practical contribution through educational programme recommendations that emphasise the importance of forming positive attitudes in behaviour transformation.
por Ziyu Liu en 29 de abril de 2026 a las 00:00
Amid accelerating urbanization, tensions between economic growth and environmental protection have become increasingly salient. Improving Total Factor Carbon Productivity (TFCP) is crucial for achieving sustainable urban development. Drawing on panel data for 282 Chinese prefecture-level cities from 2009 to 2021, this paper examines the effects and underlying mechanisms of the Low-Carbon City Pilot (LCCP) policy on urban TFCP. The results suggest that the LCCP policy noticeably contributes to higher TFCP, and the finding remains valid after robustness checks and endogeneity corrections. The impact of the policy exhibits marked variation, yielding stronger gains in western regions of China, in small- and medium-sized cities, in cities not dependent on resource extraction, and in major transportation nodes. Technological progress, the optimization of industrial structure, and advances in economic development serve as key intermediary mechanisms. Moreover, the LCCP policy exhibits positive spatial spillover effects that help lift TFCP in neighboring cities. These findings provide empirical support for differentiated low-carbon policy design and regional coordinated low-carbon development, and carry considerable practical and strategic significance for balancing high-quality economic development and ecological protection.
por Yelena Shin en 29 de abril de 2026 a las 00:00
Special economic zones (SEZs) are widely used to stimulate investment, employment, and industrial growth. Yet their contribution to sustainable regional development remains poorly measured. This is especially true in Kazakhstan, where zone-level assessment is largely absent from regional planning frameworks. This study addresses that gap. We construct a Regional Sustainable Development Index (RSDI) that integrates economic, social, and environmental indicators across nine Kazakhstani regions hosting active SEZs. Economic performance alone gives an incomplete picture. Omitting social and environmental dimensions distorts policy conclusions and masks structural imbalances. Our results reveal sharp differentiation across regions. In the Atyrau region, high investment volumes correspond closely with sustainability gains. This suggests structural coherence between zone operations and broader regional outcomes. The Pavlodar region presents a contrasting case. There, the leading driver of sustainability performance is not investment volume but the reduction of environmental pollution. This finding underscores why disaggregating sustainability components matters—the composite index alone is not sufficient. A comparison against official target indicators identifies both achievements and systematic shortfalls. Investment and employment targets are frequently decoupled: capital attraction does not reliably generate proportional job creation. The social dimension remains the weakest across most zones. Environmental governance shows formal recognition but limited implementation. The RSDI framework offers a practical diagnostic tool for public authorities. It makes imbalances visible before they become entrenched. Beyond Kazakhstan, the index provides a transferable instrument for resource-dependent emerging economies seeking to embed sustainability criteria into SEZ governance and regional planning.