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INDONESIA
Civil Engineering Journal
Published by C.E.J Publishing Group
ISSN : 24763055     EISSN : 24763055     DOI : -
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture
Civil Engineering Journal is a multidisciplinary, an open-access, internationally double-blind peer -reviewed journal concerned with all aspects of civil engineering, which include but are not necessarily restricted to: Building Materials and Structures, Coastal and Harbor Engineering, Constructions Technology, Constructions Management, Road and Bridge Engineering, Renovation of Buildings, Earthquake Engineering, Environmental Engineering, Geotechnical Engineering, Highway Engineering, Hydraulic and Hydraulic Structures, Structural Engineering, Surveying and Geo-Spatial Engineering, Transportation Engineering, Tunnel Engineering, Urban Engineering and Economy, Water Resources Engineering, Urban Drainage.
Arjuna Subject : -
Articles 24 Documents
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Search results for , issue "Vol. 11 No. 12 (2025): December" : 24 Documents clear
The Influence of the Fine Earth Composition of the Soil Mixture on the Parameters of Its Filtration, Moisture Content, and Density Bekbasarov, Isabai; Suienshbayeva, Kuralay; Atenov, Yerlan; Shanshabayev, Nurzhan
Civil Engineering Journal Vol. 11 No. 12 (2025): December
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-12-013

Abstract

The article presents the results of laboratory studies on the patterns of change in the filtration coefficient of the fine-grained component (fine earth) of the soil mixture from a number of influencing factors. The study was conducted to assess the impact of the fine earth fractional composition of a soil mixture on its filtration parameters and density-moisture state. The experiments were conducted using a compression device, the use of which is regulated by the standard of the Republic of Kazakhstan. One hundred and twenty-six fine earth samples were tested, containing 50 to 75% (by weight) of various fractions with particle sizes smaller than 5 mm. An analysis of the test results revealed that for large fractions (with particle sizes of 5 mm or less, but more than 1 mm), the filtration coefficient of fine earth increases as the weight content of fractions in it increases (from 50 to 75%), while for small fractions (with particle sizes of 1 mm or less), it decreases. It was determined that similar patterns are characteristic of the increase in moisture content and increase in the density of fine earth, which occur when water is filtered through it. The scientific novelty of the research lies in the fact that, based on the identified patterns, correlation dependencies were established between the filtration coefficient and the weight content of various fractions, as well as the increase in moisture content and the increase in the density of fine earth. Correlation dependencies of the filtration coefficient on the weight content of various fractions, as well as on the increase in moisture content and increase in the density of fine earth, were established. Based on the established relationships, formulas were developed for predicting the filtration coefficient, moisture content, and density of fine earth, which adds practical value to the research. These formulas are recommended for use in selecting optimal fine earth compositions for soil mixtures used in dam construction.
Influence of Polypropylene Fiber on Mechanical and Shrinkage Behavior of Porcelain Based Geopolymer Klingsad , Rada; Israngkura Na Ayudhya, Borvorn
Civil Engineering Journal Vol. 11 No. 12 (2025): December
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-12-024

Abstract

This study examines the effects of polypropylene (PP) fiber content and initial curing temperature on shrinkages, mechanical properties, and microstructural characteristics of porcelain-based geopolymers. Geopolymer mixes were prepared with PP fiber dosages of 0.5%, 1.0%, 1.5%, and 2.0% by weight and initially cured at 60 °C, 75 °C, 90 °C, and 105 °C. Autogenous and drying shrinkage were monitored at 24 h, 72 h and 3, 7, 14, 21, 28, 60, 90, and 120 days, while compressive and splitting tensile strengths were tested at 3, 7, 14, 21, and 28 days. The results demonstrated that the incorporation of PP fiber not only shortened the setting time but also significantly reduced both autogenous and drying shrinkage of the geopolymer mortar. The most favorable performance was observed in specimens containing 2.0% PP fiber cured at 105 °C, which exhibited the lowest shrinkage values. Autogenous shrinkage was 439 μɛ at 24 h and 392 μɛ at 120 days, while drying shrinkage was 544 μɛ at 24 h and 194 μɛ at 120 days. Increasing fiber content decreased porosity, producing a more compact, homogeneous matrix and improving mechanical performance of concrete specimens, particularly splitting tensile strength; the optimal dosage was 2%, yielding 28‑day compressive strength of 41.03 N/mm² and splitting tensile strength of 7.65 N/mm².
Improving Thermal Comfort and Air Quality: PET and CO₂ Evaluation of School Courtyard’s Orientation Salameh, Muna; Touqan, Basim
Civil Engineering Journal Vol. 11 No. 12 (2025): December
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-12-023

Abstract

This study aims to investigate the thermal conditions related to the variations in the school courtyard’s orientation, focusing on mass temperature (Tm), outdoor air temperature, and Physiological Equivalent Temperature (PET). A qualitative methodology based on ENVI-met software was adopted. Simulations for the existing school building were performed in the four basic orientations on 21 March and 21 September to assess the thermal impact of the courtyard’s orientations. Results showed that orientation produced slight but meaningful differences in Tm, with variations of 0.16°C in September and 0.20°C in March. Though modest, these differences become significant when scaled to the large mass of the school buildings, where even small reductions affect energy demand and comfort. For outdoor air temperature, the south orientation achieved reductions of 0.53–1.13°C in September and 1.1–1.9°C in March compared to ambient conditions. PET and wind maps supported these findings, with the south orientation allowing better airflow and better thermal comfort. Furthermore, analysis of CO₂ concentration confirmed that the south-facing courtyard provided the healthiest air quality. The study highlights that courtyard orientation should not be overlooked in large educational buildings, as even slight orientation-driven improvements become critical, reinforcing the importance of integrating orientation into holistic passive design strategies.
BIM Utilization to Eliminate Claims, Risks, and Improve Productivity in Construction Projects Bakr, Emad Hashem; Elbeltagi, Emad; Tantawy, Mohamed
Civil Engineering Journal Vol. 11 No. 12 (2025): December
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-12-011

Abstract

Delays, cost overruns, and disputes have traditionally plagued the construction industry. These issues arise from poor management and the complexities of construction projects. Given this situation, this research sought to identify and quantitatively prioritize the factors leading to claims/disputes, risks, and the construction activity productivity. At the same time, it aimed to measure the extent to which the BIM approach mitigates such factors. A mixed methodological approach was utilized, which included a structured questionnaire survey and two case studies. For quantitative data analysis, advanced techniques and tools of IBM SPSS and AMOS were used, which included mean analysis, Standard Deviation (SD), Relative Importance Index (RII), Confirmatory Factor Analysis (CFA), Exploratory Factor Analysis (EFA), and Structural Equation Modeling (SEM). The findings confirmed the hypothesis of this research, showing BIM implementation directly and substantially improves productivity, as evidenced by the 28% reductions in disputes, 31% in communication efficiency, and 24% in overall productivity. Moreover, SEM results confirmed the existence of positive causal relationships regarding BIM adoption and cost control, schedule compliance, and safe work performance. This study conclusively demonstrates that BIM is a dynamic management approach to enhancing stakeholder coordination, minimizing disputes, and ultimately ensuring project viability.

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