
Prof. Scholz Miklas
University of Johannesburg, South Africa





Open Access
Article
Article ID: 2175
by Khaled Own Mohaisen, Md. Hasan Zahir, Kashif Irshad, Aasif Helal, M. Nasiruzzaman Shaikh
Building Engineering, Vol.3, No.4, 2025;
The development of shape-stabilized phase change materials (SS-PCMs) and their use in construction materials has demonstrated significant potential for improving building energy efficiency and reducing the power consumption of buildings, particularly in desert climates. Despite these benefits, the widespread application of PCMs in civil infrastructure is hindered by their high cost, preparation complexity, leakage issues, and low thermal conductivity. This study addresses these challenges by employing a low-cost, lightweight aggregate (LWA) as a carrier combined with polyethylene glycol (PEG) to develop an LWA/PEG composite PCM. The PEG was incorporated into the LWA pores using a vacuum impregnation technique. Analysis via X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) confirmed that the LWA/PEG composite was successfully prepared without any chemical reactions occurring during the process. However, LWA/PEG composite suffers from leakage problems, which limit its use in building applications. Accordingly, a cement paste coating was developed and applied on LWA/PEG to prepare SS-PCM (CLWA) to prevent the leakage of the composite and enhance its thermal conductivity. Moreover, it was noted that the developed CLWA is chemically stable, and it exhibited outstanding thermal stability after 200 cycles of melting and solidification without signs of leakage. These advantageous characteristics indicate that the CLWA developed can be effectively employed to enhance the thermal efficiency of construction materials to achieve net-zero energy in buildings.
Open Access
Article
Article ID: 3822
by Abdul Aleem, Ahmad Riaz, Tehseen Ullah, Farhan Ali
Building Engineering, Vol.3, No.4, 2025;
The construction industry worldwide experiences significant project delays, particularly in the public sector of the construction industry. Construction delays have a substantial effect on the economic development of areas and employment opportunities for the local population, particularly in underdeveloped regions like Balochistan, Pakistan. This research examines the most significant and influential factors causing delays in government building construction within Balochistan, Pakistan. The study presents mitigation solutions and strategies proposed by experts using a Delphi technique for the critical and influential delay factors. The questionnaire survey to collect responses from participants consists of 24 delay factors, which are derived from existing literature and experts’ consultation. A satisfactory degree of data reliability was demonstrated by the survey's 78% response rate. Cronbach's alpha and split-half reliability tests were used in SPSS to assess internal consistency. Delay factors were categorized and ranked based on perceived relevance using the Relative Importance Index (RII). Additionally, to provide an alternate prioritizing of delay variables, the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) was used with Microsoft Excel and common mathematical formulations. To confirm the stability and robustness of the rankings, a comparison of the RII and TOPSIS results was done. The results establish the groundwork for further studies on building delays and give insightful information for decision-making in the public sector.
Open Access
Article
Article ID: 3980
by Guosong Yang
Building Engineering, Vol.3, No.4, 2025;
The environmental impact of ordinary Portland cement (OPC) production, particularly its high carbon emissions and energy consumption, has prompted the structural engineering community to seek more sustainable alternatives. This review examines a range of materials that can partially or fully replace OPC, including industrial by-products (e.g., fly ash, ground granulated blast furnace slag), geopolymers, natural pozzolans, and recycled construction waste. The article evaluates these alternatives in terms of their mechanical performance, durability, workability, and suitability for structural applications. Environmental and economic assessments, including life cycle analysis and cost considerations, are also discussed to provide a holistic view of sustainability. While many alternatives show promising performance and environmental benefits, wider adoption depends on overcoming technical challenges, regulatory gaps, and market inertia. This review highlights the need for integrated efforts in research, policy, and practice to transition toward more sustainable materials in structural engineering.
Open Access
Article
Article ID: 3764
by Yue Lyu
Building Engineering, Vol.3, No.4, 2025;
The building sector faces a critical “Policy-Carbon Paradox”: while carbon pricing covers 23% of global emissions, it addresses only 12.7% of construction emissions, resulting in a 7.6-fold decarbonization lag. To resolve this, we propose a Threshold-regulated Policy Framework (TPF) that leverages blockchain-AI fusion for dynamic carbon governance. Empirically, we identify two critical carbon price thresholds: a material substitution tipping point at $120 ± 15/tCO2 (p < 0.01) and an energy system transformation point at $200/tCO2 (Internal Rate of Return (IRR) > 8%). Theoretically, these sigmoidal thresholds supersede the conventional Environmental Kuznets Curve, demonstrating a 0.38 R2 improvement over static models. Methodologically, an ISO 14064-3:2019-compliant blockchain-Measurement, Reporting and Verification (MRV) system achieves a 73% reduction in measurement uncertainty (Root Mean Square Error (RMSE) = 0.48 kg CO2e/tonne) and enables real-time policy adjustments with 2.3 ± 0.7-h latency. This activates a self-reinforcing Policy-Technology-Environment (PTE) Loop, driving a 17-fold growth in green bond issuance and increasing prefabrication penetration by 51.4 percentage points. Applied regionally, the framework reduces decarbonization costs by 38.2% in China (φ-adjusted Emissions Trading System (ETS)), cuts embodied carbon by 55% in the EU (Carbon Border Adjustment Mechanism Building Information Modeling (CBAM-BIM) integration), and slashes verification costs by 72.4 ± 5.2% in the Global South (satellite-blockchain MRV). Collectively, this generates $2.8 ± 0.6 billion/year in health co-benefits through PM2.5 reduction. Our findings establish a scalable, data-driven pathway to close the building sector's decarbonization gap with a 92.3% probability of aligning with the 1.5 ℃ climate goal.