Sustainable Infrastructure Development Research Articles

Mechanical properties and durability of asphalt-concrete composites enhanced with recycled concrete and porcelain aggregates.

Mechanical properties and durability of asphalt-concrete composites enhanced with recycled concrete and porcelain aggregates.

SorpVision: A Comprehensive Dataset for Cementitious Sorptivity Analysis Powered by Computer Vision

As the construction industry advances toward more efficient methods for assessing durability, the need for automated sorptivity evaluation has become increasingly critical. Consequently, this study introduces SorpVision, a dataset of 7,384 images (5,000 real and 2,384 synthetic) designed to support our custom computer vision-based framework for automated sorptivity evaluation in cementitious materials. Traditional methods, such as ASTM C1585, depend on manual weighing, which is time-consuming and limits measurement intervals. SorpVision, combined with a cost-effective USB camera setup and a robust vision algorithm, facilitates real-time water level detection in cementitious systems. The framework, trained using 1,440 data points from pastes with water-to-cement (w/c) ratios of 0.4–0.8 and curing durations of 1–7 days, achieves high predictive accuracy for initial and secondary sorptivities (R2 > 0.9 for cement pastes). Moreover, it generalizes well to mortar and concrete, yielding R2 values of 0.96 and 0.87 for initial sorptivity and 0.74 and 0.65 for secondary sorptivity, respectively. SorpVision offers an accurate, data-driven foundation for scalable, automated durability evaluations, supporting sustainable infrastructure development.

Comparative study of highway performance using Recycled Asphalt (RAP) and conventional asphalt in supporting sustainable development

This study compares the performance of roads using recycled asphalt pavement (RAP) and conventional asphalt in supporting sustainable development. The research was conducted using a literature review and secondary data analysis from various laboratory test results and field projects in Indonesia. The findings indicate that asphalt mixtures with RAP content ranging from 30–50% can achieve Marshall stability equivalent to or even higher than conventional asphalt, with material cost savings of up to 35–40% per ton. Additionally, RAP significantly reduces the consumption of new aggregates, construction waste, and carbon emissions, thereby supporting the principles of green roads and resource efficiency. However, the use of high levels of RAP requires the addition of rejuvenating agents to maintain the flexibility and durability of the mixture. Therefore, optimising the use of RAP through proper proportioning, mixing technology, and supportive policies can serve as a strategic solution for environmentally friendly, efficient, and sustainable road infrastructure development in Indonesia.

Sustainable Infrastructure Development: Integrating Karst Seepage Field Characteristics with Water Inrush Prediction Models of the Qigan Mountain Tunnel

[Objective] This study aims to assess and predict the risks of water inrush and leakage during tunnel excavation in karst regions, where groundwater intrusion poses serious threats to construction safety and long-term hydrogeological sustainability. [Study area] This study is conducted in the Qigan Mountain, involving detailed hydrogeological surveys and hydrochemical analyses to understand the subsurface conditions. [Methods] Numerical simulation methods are employed to model the regional seepage field distribution under natural conditions and two excavation conditions, using MODFLOW. [Challenges] One of the main challenges is accurately estimating tunnel water inflow under varying geological and hydrological conditions. [Results] The simulation results indicate that under excavation with blocking conditions, tunnel water inflow reaches 31,932 m3/d, whereas without blocking, inflow surges to 359,199 m3/d. In contrast, the theoretical calculation estimates a water inflow of 131,445 m3/d, revealing considerable discrepancies between the methods. [Recommendations] These findings highlight an important point of reference for the prevention of water influx in karst tunnel construction.

Magnetite-Modified Asphalt Pavements in Wireless Power Transfer: Enhancing Efficiency and Minimizing Power Loss Through Material Optimization

Wireless power transfer (WPT) is recognized as a critical technology to advance carbon neutrality in transportation by alleviating charging challenges for electric vehicles and accelerating their adoption to replace fossil fuel. To ensure durability under traffic loads and harsh environments while avoiding vehicle obstructions, WPT primary circuits should be embedded within pavement structures rather than surface-mounted. This study systematically investigated the optimization of magnetite-modified asphalt material composition and thickness for enhancing electromagnetic coupling in WPT systems through integrated numerical and experimental approaches. A 3D finite element model (FEM) and a WPT platform with primary-side inductor–capacitor–capacitor (LCC) and secondary-side series (S) compensation were developed to assess the electromagnetic performance of magnetite content ranging from 0 to 25% and pavement thickness ranging from 30 to 70 mm. Results indicate that magnetite incorporation increased efficiency from 80.3 to 84.7% and coupling coefficients from 0.236 to 0.242, with power loss increasing by only 0.25 W. This enhancement is driven by improved equivalent permeability, which directly enhances magnetic coupling efficiency. A critical pavement thickness of 50 mm was identified, beyond which the reduction in transmission efficiency increased significantly due to magnetic flux dispersion. Additionally, the nonlinear increase in power loss is partially attributed to the significant rise in hysteresis and eddy current losses at elevated magnetite content levels. The proposed design framework, which focuses on 10% magnetite content and a total pavement thickness of 50 mm, achieves an optimal energy transfer efficiency. This approach contributes to sustainable infrastructure development for wireless charging applications.

Identification and Ranking of Human Resource-Related Risks Considering Secondary and Residual Risks in Water Transfer Projects Using the DEMATEL–MARCOS Method

In competitive organizations and projects, assessing risks related to human capital is essential for improving workplace conditions and ensuring project success. This study evaluates primary, secondary, and residual human capital risks in urban water transfer projects using an innovative hybrid DEMATEL–MARCOS approach. The DEMATEL method was employed to analyze causal relationships and interdependencies among risks, while the MARCOS method ranked their significance. The key findings reveal that “accidents during material transportation” (primary risk), “corrosion” (secondary risk), and “pipeline pressure” (residual risk) are the most critical factors influencing human capital in such projects. The study provides a structured framework for prioritizing risk mitigation strategies, offering actionable insights for policymakers and project managers to enhance safety, efficiency, and workforce well-being. By integrating multi-criteria decision-making techniques, this research bridges a gap in the water industry’s risk management practices and contributes to safer, more sustainable infrastructure development.

High-Level Risk Analysis in the Construction Project of RSUD Dr. H. Slamet Martodirdjo in Pamekasan

The construction of the Regional General Hospital Dr. H. Slamet Martodirdjo in Pamekasan Regency faces several challenges, particularly concerning high-level risks that may impact project success. This study aims to identify and analyze major risks affecting project completion and propose effective mitigation strategies. Using a survey method, data were collected from key stakeholders and processed using the Severity Index and Probability and Impact Matrix to assess risk levels. The findings identified 25 potential risks, with eight categorized as high-level risks: implementation method errors, difficulties in installing cross foundations, delays in critical path tasks, late material procurement, labor shortages, non-compliance with occupational safety regulations, lack of teamwork among workers, and adverse weather conditions. These risks significantly impact the project timeline, budget, and overall quality. The study also reveals that poor coordination among stakeholders, inefficient risk management practices, and regulatory constraints contribute to project delays. To mitigate these risks, strategic planning, improved procurement management, workforce training, and strict adherence to occupational safety regulations are recommended. Additionally, the adoption of technology-driven solutions, such as digital monitoring systems and e-procurement platforms, can enhance project oversight and efficiency. By implementing a systematic risk management framework, construction projects can minimize potential disruptions, ensure timely project delivery, and maintain cost efficiency. The findings of this study provide valuable insights for project managers, contractors, and policymakers in the construction industry, particularly for large-scale healthcare infrastructure projects. A proactive risk mitigation approach is essential to achieving successful project execution and sustainable infrastructure development.

Public-Private Partnerships for Sustainable Infrastructure Development

Objectives: To analyze the role of Public–Private Partnerships (PPPs) in sustainable infrastructure development. To examine the effectiveness, challenges, and opportunities of PPPs in realizing long-term economic, environmental, and social benefits. To assess global trends, best practices, and policy recommendations for enhancing PPP models aligned with sustainability goals. To explore the role of PPPs in achieving the United Nations’ Sustainable Development Goals (SDGs), particularly in energy, transportation, and urban development. Methods: Analyzing global trends and best practices in the use of PPPs for infrastructure development. Reviewing policy recommendations aimed at strengthening PPP models. Investigating how PPPs can align with the SDGs and contribute to sustainability in key sectors like energy, transportation, and urban development. Results: PPPs provide a viable strategy for financing and managing infrastructure, leveraging private sector investment, expertise, and innovation. Successful PPPs are governed by strong frameworks, transparent contracts, and fair risk-sharing arrangements. PPPs can contribute to long-term economic, environmental, and social benefits when effectively managed. PPPs have a significant role in achieving the SDGs, particularly in energy, transportation, and urban development sectors. Conclusion: PPPs are essential for addressing infrastructure deficits and driving sustainable development. To maximize their potential, PPPs must be governed by strong frameworks with clear contracts and equitable risk-sharing. The study provides valuable insights for policymakers, investors, and stakeholders seeking to enhance infrastructure resilience, enable green growth, and advance sustainable development goals globally.

EVALUATING HOUSING QUALITY AND LIVEABILITY IN JOS NORTH LOCAL GOVERNMENT AREA: IMPLICATIONS FOR HEALTH AND URBAN DEVELOPMENT

This study examines Housing Quality and Liveability in Jos North Local Government Area: implications for health and urban development. First, it explores the concept of liveability and housing quality, as well as liveability in Nigerian urban environments; secondly, it explores liveability vis-à-vis health; and finally, it analyses its implications for health and urban development. A quantitative approach was employed, and primary data focusing particularly on two districts, Utan Village and ECWA Staff Neighbourhood, were employed, and data were collected by administering questionnaires to selected households. The survey covered perception of safety, distance to health facilities, satisfaction with health services, health issues, and implications for urban development. Key outcomes show variations in housing quality and its impact on health, such as respiratory and water-borne diseases, amongst others. Key outcomes reflect variations in the quality of housing and liveability of the people living in both neighbourhoods vis-à-vis implications for health and urban development. The study accentuates the need for sustainable housing guidelines, infrastructure development, and equitable urban planning to deal with these issues and enhance the standard of living in Jos North LGA. The study recommends promoting quality housing, improving infrastructure, supporting inclusive urban policies, and expanding healthcare access in underserved areas, among others.

ANFIS modelling of the strength properties of natural rubber latex modified concrete

The increasing demand for sustainable construction materials has driven research into innovative modifications to enhance concrete performance while reducing environmental impact. This study investigates the optimization of Natural Rubber Latex Modified Concrete (NRLMC) using an Adaptive Neuro-Fuzzy Inference System (ANFIS), a hybrid AI model that integrates fuzzy logic and neural networks for precise property prediction. The justification for this study stems from the need for an eco-friendly, high-performance alternative to conventional concrete, leveraging renewable natural rubber latex (NRL) to improve mechanical properties and durability. Laboratory experiments were conducted to evaluate the effects of varying NRL and calcium sulfate (CaSO4) contents on compressive, flexural, and splitting tensile strength. Results showed that an optimal mix of 10% NRL and 2% CaSO4 achieved a compressive strength of 44.27 MPa, while 9% NRL and 1.8% CaSO4 yielded peak flexural and splitting tensile strengths of 12.33 MPa and 5.1 MPa, respectively. Beyond these thresholds, mechanical properties declined due to matrix destabilization. Microstructural analysis using Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy confirmed NRL’s role in reducing porosity and enhancing matrix uniformity. The ANFIS model demonstrated exceptional accuracy, with low RMSE and MAPE values and a strong R2 correlation, offering a superior predictive framework compared to traditional modeling techniques. Furthermore, SHAP analysis reveals that OPC (%) and NRL (%) are the primary contributors to compressive and tensile strength, while CaSO4 (%) has a moderate impact, particularly on flexural and tensile properties, providing valuable insights for optimizing material composition in construction applications. This research holds significant implications for sustainable infrastructure development, promoting renewable resource utilization while enhancing the durability and resilience of concrete structures. Future studies should explore hybrid AI models, long-term field performance, and additional material combinations to further optimize NRLMC’s applicability in various structural environments.

Strategic Contract Oversight for Sustainable Infrastructure Development Across Nationally Significant Construction Sectors

Strategic Contract Oversight for Sustainable Infrastructure Development Across Nationally Significant Construction Sectors

Public-private partnerships (PPP) in infrastructure financing: A comparative study of developed and developing economies

Public-private partnerships (PPPs) facilitate risk-sharing and asset financing to encourage private sector involvement in infrastructure development, particularly in developing countries facing growing infrastructure needs. This research compares PPP frameworks in developed and developing nations, focusing on risk management, financial structures, and sustainability practices. Developed countries benefit from stable legal systems, robust financial instruments, and effective risk-sharing mechanisms that attract private investment. In contrast, developing economies often struggle with weak regulations, market instability, and limited institutional capacity. Multilateral institutions like the World Bank, Asian Development Bank, and International Finance Corporation support PPPs by offering risk mitigation tools and sustainable financing. The study emphasizes that sustainability, through ESG assessments, green finance, and climate-resilient infrastructure, is crucial to long-term PPP success. Findings reveal that generic PPP models often fall short without tailored strategies. Effective partnerships require strong institutional frameworks, collaborative governance, and innovative financing. Ultimately, PPPs must adopt transparent, adaptable, and climate-responsive approaches to overcome regulatory, financial, and environmental challenges, positioning them as vital mechanisms for sustainable infrastructure development.

A case study on developing asphalt mix performance grading (Mix-PG) system in Ontario

Road infrastructure plays a crucial role in facilitating the movement of goods and people, promoting global economic growth, trade, and connectivity. Achieving sustainability and resiliency within road systems extends their lifespan, stabilizes economies, enhances climate adaptability, and reduces both maintenance costs and environmental impact. With the increasing use of recycled materials and chemical additives in asphalt mixes, relying only on asphalt binder Performance Grading (PG) is insufficient for predicting field performance of asphalt pavements and material resilience under various climatic projections and severe weather events. Therefore, this study introduces the concept of asphalt mixture PG system (Mix-PG system) for evaluating asphalt materials resilience. The proposed Mix-PG system is demonstrated using the following three laboratory tests: (1) the Disc-Shaped Compact Tension (DC(T)) test assessed low-temperature cracking resistance, establishing a minimum threshold for fracture energy to determine the continuous low-temperature PG, (2) the Hamburg Wheel Tracking (HWT) test measured rutting resistance, with a maximum threshold for creep slope defining the continuous high-temperature PG, and (3) the Illinois Flexibility Index Test (I-FIT) evaluated intermediate-temperature cracking resistance, ensuring mixes meet a minimum Flexibility Index (FI) threshold value. This research revealed that meeting a single threshold value of a laboratory test, at a single temperature, may not result in a comprehensive evaluation of mix performance and durability at various climatic projections and material resilience under severe weather events. However, a mix PG assessment diagram—integrating low- and high-temperature PGs and FI values—offers a comprehensive framework for assessing asphalt materials’ resilience for major decisions and high-profile projects based on expected climate performance and projections. The Mix-PG system is not intended for routine mix design or quality control/assurance. Instead, it is proposed for critical decision-making scenarios—such as evaluating alternative mix designs or incorporating innovative materials—particularly in high-profile projects like major highways, high-traffic intersections, or projects where climatic resilience is a key design objective. Additionally, the proposed framework may be applied at the network level to assess typical climatic resilience using common mixture types, thereby helping to identify potentially vulnerable areas under various climate change scenarios. Ultimately, this approach may be used in supporting the development of resilient and sustainable road infrastructure.

Investment Risk Assessment and Countermeasure Strategies for Highway PPP Projects in Western China: A Dynamic Risk Accumulation Modeling Approach

This study develops a dynamic risk modeling approach incorporating stock-and-flow structures to comprehensively evaluate the investment risks of highway PPP projects in Western China, aiming to promote sustainable infrastructure development. Through establishing a risk accumulation model with scenario simulation and sensitivity analysis, this study systematically examines the risk factors and their propagation pathways in Western China’s highway PPP projects. The research demonstrates the dynamic complexity of project risks, particularly highlighting the prominence of operation, maintenance, and government risks. Sensitivity analysis identifies five critical risk factors: financial support adequacy, public health contingencies, legal/regulatory robustness, inflation volatility, and project uniqueness. The study proposes targeted risk management strategies emphasizing the establishment of early-warning systems and emergency response plans for critical risks. Methodologically, this research advances infrastructure risk assessment by adapting stock-and-flow modeling conventions for threshold-driven risk screening, particularly suited to underdeveloped regions like Western China. The developed rapid risk determination tool provides practical decision support for stakeholders in similar socio-economic contexts.

Material-Structural Synergy in Ultra-High-Performance Concrete-Optimized Prestressed Concrete Cylinder Pipes: Achieving Lightweight Design for Sustainable Infrastructure.

While a large diameter is critical for maintaining water delivery efficiency in prestressed concrete cylinder pipes (PCCPs), excessive weight fundamentally limits their practical application. This study proposes a weight reduction strategy through material optimization and structural redesign. A full-scale experimental model of 2.8 m inner diameter PCCP was used to validate the finite element analysis method. Comparative numerical models were established to analyze strain/stress distribution in mortar coatings when using ultra-high-performance concrete (UHPC) versus conventional concrete cores. The key findings reveal that UHPC implementation reduces maximum coating strain by 20-30% compared to its conventional concrete counterparts. Multivariate linear regression analysis yielded a predictive formula that explicitly correlates the elastic modulus of the concrete core, core thickness, and mortar stress. This relationship permits the direct optimization of core thickness reductions according to the elastic modulus characteristics of UHPC materials. Verification through two case studies demonstrated a 25-35% core thickness reduction compared to the Chinese standard specifications while maintaining structural integrity, corresponding to an 18-22% total weight reduction. The proposed methodology successfully resolves the inherent weight limitation of conventional PCCPs while achieving equivalent hydraulic capacity, providing an effective pathway for sustainable infrastructure development through material-efficient design.

Gauteng’s Infrastructure Sustainability Development: Smart Initiatives

Gauteng, South Africa's preeminent economic hub, confronts the imperative of achieving sustainable infrastructure development amidst rapid urbanization. The strategic integration of smart initiatives is crucial for fostering economic growth, environmental resilience, and societal well-being. This paper presents a critical review of Gauteng's infrastructure sustainability efforts through smart initiatives, employing a conceptual model that delineates Infrastructure Sustainability Development (ISD) as the dependent variable. Four independent variables—Smart Energy Systems, Smart Transportation, Smart Water Management, and Smart Urban Planning—are examined, each further defined by five sub-variables to ensure a comprehensive evaluation of their impact. This analysis evaluates the efficacy of provincial smart infrastructure initiatives, including the flagship Lanseria Smart City project, in promoting sustainability and aligning with the United Nations Sustainable Development Goals (SDGs). The study draws upon relevant theoretical frameworks, including Sustainable Development Theory, Systems Theory, Innovation Diffusion Theory, and the Smart Cities Framework, to provide a robust analytical foundation. The findings highlight achievements, challenges, and prospects, culminating in policy implications and recommendations for enhancing sustainable infrastructure development in Gauteng.

AFRICAN LATERITIC SOILS AND PAVEMENTS FAILURE: A REVIEW

African lateritic soils, prevalent in many regions of the continent, are widely used in the construction of pavements. However, these soils often experience failure in road infrastructure due to their inherent properties, such as high moisture sensitivity, poor compaction, and variable strength. This review investigates the primary causes of pavement failure associated with African lateritic soils and highlights issues such as inadequate soil stabilization, seasonal fluctuations in moisture content, and the low shear strength of untreated soils. The swelling and shrinkage behavior of lateritic soils under different environmental conditions exacerbate pavement distress, leading to cracks, rutting, and erosion. The lack of proper maintenance and inadequate design methods contribute to the accelerated deterioration of pavements in Africa. To mitigate these challenges, several solutions are proposed. These includes the use of chemical or natural stabilizers, such as cement, lime and pozzolans, to enhance soil properties and reduce moisture sensitivity. The adoption of modern engineering techniques, such as soil grading optimization, and the introduction of geosynthetics in pavement layers are also recommended. Implementing these approaches would enhance the durability and improvement of pavements constructed on lateritic soils, thus reducing maintenance costs and ensuring sustainable infrastructure development in Africa.

Sustainability Analysis of Domestic Wastewater Management System in Gundik Village Using Net Present Value (NPV) and Benefit Cost Rasio (BCR) Methods

The construction of the Centralized Domestic Wastewater Management System (SPALD-T) in Gundik Village realizes the goal of SDGs 2030 point 2 and RPJPN 2025-2045, namely 70% proper sanitation. After four years of operation since 2021, the sustainability of SPALD-T needs to be re-analyzed, especially in terms of the economy. Based on the KPP report and initial observations, there are indications that the economic cycle of this management system has not been running optimally. The method of sustainable economic analysis used the Net Present Value (NPV) and Benefit-Cost Ratio (BCR) methods. The results of the NPV analysis were IDR 25,930,265 (positive) and BCR was 1.22 (more than 1), the SPALD-T project was declared economically feasible and had the potential to provide sustainable benefits. SPALD-T is designed to operate for 20 years or more, providing benefits such as health cost efficiency, improving environmental quality, and strengthening the local economy. The domestic wastewater management system in Gundik Village encourages sustainable infrastructure development to create an independent and equitable society. The economic sustainability of SPALD-T can be a model for domestic waste management that supports sustainable development in Indonesia..

Sustainable Reuse of Waste Palm Oil Fuel Ash in Geopolymer Stabilization of Silty Soil: a Comprehensive Assessment of Mechanical Strength and Leaching Toxicity for Environmentally Conscious Infrastructure Development

Soil plays a vital role in infrastructure development, but certain types, such as silty soil, require stabilization due to their poor load-bearing capacity. With a growing emphasis on sustainable construction highlights palm oil fuel ash (POFA), a byproduct of biomass combustion in palm oil mills, as a viable alternative for soil stabilization, particularly in regions such as Sultan Kudarat, Philippines, where it is readily accessible. This study addresses the limited research on using POFA-based geopolymer for stabilizing silty soils, particularly in evaluating its environmental impact, and applicability in infrastructure development. It aims to assess the effectiveness of POFA-based geopolymer in enhancing the strength, stability, and load-bearing capacity of silty soil in Sultan Kudarat. A post-test-only controlled group experimental design was used to evaluate the effectiveness of POFA-based geopolymer in stabilizing silty soil, and mechanical strength tests were conducted on both the natural soil and treated samples. The study assessed shear strength, compressive strength, and California bearing ratio (CBR) using ASTM-standard methods alongside a Toxicity Characteristic and Leaching Procedure (TCLP) to evaluate environmental safety. Results showed that POFA-based geopolymer significantly improved shear strength, with optimum performance at 27.5% and 30% of POFA after 28 days of curing. Whereas compressive strength and CBR values were lower than in natural soil, treated samples showed enhanced ductility, reduced swell potential, and stable failure modes. TCLP confirmed that all heavy metals tested were below regulatory limits, with a non-corrosive pH of 10.95 and no hazardous reactivity or flammability observed. These results highlight POFA-based geopolymer as a safe, environmentally friendly option for stabilizing silty soils and offer potential for sustainable infrastructure development.

Review of Power Electronics Technologies in the Integration of Renewable Energy Systems

Power electronics (PE) technology has become integral across various applications, playing a vital role in sectors worldwide. The integration of renewable energy (RE) into modern power grids requires highly efficient and reliable power conversion systems, especially with the increasing demand for grid controllability and flexibility. Advanced control and information technologies have established power electronics converters as essential enablers of large-scale RE generation. However, their widespread use has introduced challenges to conventional power grids, including reduced system inertia and stability issues. This article studies the critical role of power electronics in the grid integration of RE systems, addressing key technical challenges and requirements. A special focus is given to the integration of wind energy, solar photovoltaic, and energy storage systems. This paper reviews essential aspects of energy generation and conversion, including the control strategies for individual power converters and system-level coordination for large-scale energy systems. This article additionally includes grid codes that pertain to wind and photovoltaic systems, as well as power conversion and control technologies. Finally, it outlines the future research directions, aimed at overcoming emerging challenges and advancing the seamless integration of RE systems into the grid, thereby contributing to the development of more sustainable and resilient energy infrastructure.