bluuebunny/crossref_metadata_2025 huggingface dataset:
Pengaruh E-Service Quality Terhadap Kepuasan Pasien BPJS Pengguna Mobile JKN Di Rumah Sakit Umum Daerah Doloksanggul Kecamatan Doloksanggul Humbang Hasundutan Tahun 2024
Authors: Siboro Kino , Hutagaol Dewi Ayu Lestari , Sinaga Megasilvia , Purba Dika Emersaida
Published: December 2024

Aplikasi JKN mobile merupakan trobosan terbaru BPJS dalam bentuk mobile application yang memudahkan penggunanya untuk melakukan kegiatan administrasi di fasilitas layanan kesehatan seperti pendaftaran online dan akses informasi lain terkai kepesertaan, tagihan, fasilitas rujukan tingkat lanjut dimana saja dan kapan saja, serta memudahkan pengguna mobile JKN untuk menyampaikan saran ataupun keluhan. Penelitian ini bertujuan untuk menganalisis pengaruh E-Service Quality terhadap kepuasan layanan pendaftaran pasien BPJS pengguna aplikasi Mobile JKN. Sampel penelitian ini terdiri dari 96 responden. Data dianalisis menggunakan uji chi-square dengan derajat kebebasan (df) sebesar 1 dan nilai tabel chi-square sebesar 3.841. Hasil penelitian menunjukkan bahwa beberapa dimensi E-Service Quality memiliki pengaruh signifikan terhadap kepuasan layanan, sementara yang lainnya tidak. Dimana, bukti fisik dengan nilai chi-square hitung (x²) 6.259, ≥ nilai tabel chi-square (3.841), sehingga hipotesis alternatif (Ha) diterima. Keandalan dengan nilai chi-square hitung (x²) 4.909, ≥ nilai tabel chi-square (3.841), sehingga hipotesis alternatif (Ha) diterima. Tanggapan dengan nilai chi-square hitung (x²) 5.014 ≥ nilai tabel chi-square (3.841), sehingga hipotesis alternatif (Ha) diterima. Namun, empati tidak berpengaruh dengan nilai chi- square hitung (x²) 3.262 < nilai tabel chi-square (3.841), sehingga hipotesis nol (Ho) diterima. Jaminan tidak berpengaruh signifikan dengan nilai chi-square hitung (x²) 0.849, < nilai tabel chi-square (3.841), sehingga hipotesis nol (Ho) diterima. Dengan demikian, dapat disimpulkan bahwa bukti fisik, keandalan, dan tanggapan memiliki pengaruh signifikan terhadap kepuasan layanan pendaftaran pasien BPJS pengguna aplikasi Mobile JKN, sedangkan empati dan jaminan tidak memiliki pengaruh signifikan.
Analisis Parameter Fisik Air Sumur sebagai Sumber Air Bersih di Desa Singaraja Kabupaten Indramayu Tahun 2024
Authors: Najmalia Risa Nurun , Nuraeni Tating , Nisa Roifatun , Fitriyah Sukhriyatun
Published: December 2024

Pada tahun 2019 sekitar 3,21% rumah tangga di Kabupaten Indramayu masih menggunakan air sumur sebagai sumber air minum dengan jumlah penduduk yang memiliki akses air minum dengan risiko rendah dan sedang yaitu 52,1%. Di Desa Singaraja Kabupaten Indramayu, masih banyak rumah-rumah yang memiliki sumur dengan jarak yang dekat dengan sumber pencemar seperti tempat pembuangan limbah, jamban, septic tank, kandang binatang ternak, dan sebagainya. Kondisi ini dapat menimbulkan risiko pencemaran pada sumber air yang dapat berdampak negatif pada kesehatan. Tujuan penelitian ini untuk mengetahui Gambaran Parameter Fisik (Suhu, Total Dissolved Solid, dan Bau) Air Sumur sebagai Sumber Air Bersih Di Desa Singaraja Kabupaten Indramayu Tahun 2024. Metode Penelitian menggunakan metode deskriptif dengan pendekatan kuantitatif. Teknik pengambilan sampel dilakukan secara Purposive Sampling dengan kriteria yang telah ditentukan. Hasil pengukuran parameter suhu air pada 38 sampel (100%) telah sesuai dengan standar baku mutu. Pada pengukuran parameter Total Dissolved Solid (TDS) didapatkan hasil, 36 sampel (95%) air sumur tidak sesuai dengan standar baku mutu, sementara 2 sampel (5%) lainnya sesuai dengan standar baku mutu. Sedangkan untuk pengukuran parameter bau pada air sumur diperoleh 8 sampel (21%) tidak sesuai dengan standar baku mutu dan 30 sampel (79%) lainnya telah sesuai dengan standar baku mutu dari Permenkes RI No. 2 Tahun 2023.
Calendario Meteorológico 2025
Authors:   Agencia Estatal de Meteorología (España)
Published: December 2024

El Calendario contiene datos estadísticos del año anterior correspondientes a diferentes variables meteorológicas a lo largo del territorio español. Además, incluye información adicional de tipo astronómico, hidrológico, fenológico o medioambiental así como artículos divulgativos de carácter meteorológico o climatológico.
Finite Element Analysis of the Influence of Hoop Coefficient on the Axial Compression Performance of Circular Concrete Filled Steel Tubular Columns
Authors: Xiong Xin
Published: December 2024

To study the effect of hoop coefficient on the axial compression performance of circular steel tube reinforced concrete columns, finite element software ABAQUS was used to model, calculate, and verify three existing circular steel tube reinforced concrete column specimens. The hoop coefficient (steel tube strength, steel tube thickness) was used as a variable parameter to conduct an extended analysis of nine specimens, and the influence of each influencing parameter on the axial compression performance of the specimens was explored. The research results indicate that the established finite element model can accurately simulate the axial compressive mechanical behavior of circular steel tube concrete columns, and the load displacement curve and failure mode show a high degree of agreement. With the increase of the confinement coefficient in the column, the ultimate bearing capacity of the specimen increases linearly, with an increase of 0.4 in confinement coefficient and a 95% increase in ultimate bearing capacity. The proposed method for calculating the hoop coefficient has a good degree of agreement.
Research and Application of Rebar Lofting Technique in Construction Engineering
Authors: Dou Wei , Pan Shihe , Zhang Kaiyuan , Lv Meng , Yang Kai
Published: December 2024

Rebar turning sample refers to the construction technicians according to the drawings to calculate the quantity of the detailed processing list and draw the rebar processing sample sketch, turning sample in the past or today is a cumbersome, difficult technical mental labor. The calculation process is complex and cumbersome, requiring rich construction experience, accuracy, rationality and optimization, understanding norms, understanding atlas, understanding drawings, and difficult higher technical occupations. In the practical application process, it is divided into two categories, one is the budget sample, which refers to the steel bar sample of the drawing in the design and budget stage to calculate the content of steel bars in the drawing, for the steel bar cost budget, bidding work, steel bar settlement, etc. The function of rebar flipping mainly includes ensuring the strength and stability of the structure, improving the construction efficiency and construction quality, and avoiding the quality problems of rebar flipping, analyzing the basis of rebar flipping and the thinking of rebar flipping, combining with the examples of rebar flipping, analyzing the rebar flipping technology, optimizing the rebar flipping results, and carrying out the ingredients of the flipping results. This paper describes the application of rebar turning technique in the control of rebar loss rate and construction organization [6].
Mechanical Properties of Sleeve Grouting Connection Based on Water-Binder Ratio Variable
Authors: Xie Yannan , Liu Wenchao , Zhang Kesheng , Ren Baoshuang , Qiao Qiyun
Published: December 2024

Grout is sensitive to water content, and to investigate the effect of different water-cement ratios of grout on the mechanical performance of grout sleeve connections, eight conditions were designed comprising a total of 48 specimens with 12 mm diameter steel bars subjected to uniaxial tensile tests. Complemented by compressive strength adjustments of grout specimens, finite element software was employed to simulate unit fracture criteria, and finite element simulations were conducted on selected specimens. Finally, based on the current research findings, a preliminary derivation of the compressive strength of grout and the calculation process of sleeve tensile strength was achieved. The study indicates: (1) specimens primarily fail due to steel bar pullout when the water-cement ratio exceeds 0.2; failures due to steel bar or thread rupture are predominant when the ratio is below 0.2; (2) the failure mode and load-displacement curves in numerical simulations correspond to experimental trends; (3) there exists a quantitative relationship between calculated load and theoretical steel bar load, with the critical compressive strength of grout during experiments being 63.07 MPa and the critical water-cement ratio being 0.23.
Study on Friction Performance of Saponified Phosphated Corrugated Pipes for Prestressed Safety Shell of “Hualong One” Nuclear Island Containment Building
Authors: Wang Yaning , Wei Desheng , Zhai Lei , Hu Lixin , Qin Huilai , Liu Kang , Liu Jun , Fang Tao
Published: December 2024

The saponification process and friction performance of corrugated pipes utilized in the “Hualong One” nuclear island prestressing system were explored in this study. Two saponification processes utilizing powdered and oily reagent, respectively, were proposed to apply saponification coating (composed of sodium stearate) of no less than 5 g/m2 on the galvanized steel strip surface, achieving stable and uniform saponification effect. An on-site 1:1 scale model experiment was designed and conducted, involving prestressed tendon tension tests for multiple types of corrugated pipes. Based on the test results and associated analyses, domestically saponified phosphated galvanized corrugated pipes exhibited friction coefficients far below the design limit (μ = 0.16), and can fully meet the low friction requirement for “Hualong One” nuclear island prestressing system. However, the number of corrugations and associated possible damage to the steel strip surface (inner wall of the corrugated pipe) caused by the domestic coiling machines may lead to slightly higher friction coefficients.
Energy Efficiency Analysis of Energy-Saving Renovation Technology for Old Residential Buildings in Hexi Region Based on BIM Technology
Authors: Cheng Yulong
Published: December 2024

The acceleration of urbanization construction has led to the rapid development of the construction industry, and building energy consumption has become the focus of energy consumption in China. However, China has a vast territory and diverse climate types. Due to its remote inland location, the northwest region has a dry climate in the westerly belt, with cold winters and hot summers. The winter heating period is generally around 160 days. The insulation performance of the enclosure structure of a large number of old residential buildings is poor, the living suitability is poor, and the heat loss is severe, resulting in a large amount of energy waste. The article takes Jiuquan City, Gansu Province, located in the northwest of China, as an example to analyze the energy consumption of energy-saving renovation technologies for maintaining structural walls, roofs, and doors and windows. The energy consumption reduction of old residential maintenance structures after adopting energy-saving renovation technologies is obtained, which is a reference for industry technicians.
BIM Modeling Technology Based on Data Mining Algorithm in Architectural Structure Engineering Design
Authors: Li Qian , Cheng Siyuan
Published: December 2024

In the present day, the construction engineering industry in China is experiencing rapid growth, with the introduction of Building Information Modeling (BIM) technology. However, the current research on the application of computer technology in building structure design is primarily focused on the traditional two-dimensional design approach, which not only proves to be inefficient but also leads to resource wastage. To address this issue, this study explores the integration of BIM technology and data mining techniques in architectural engineering structure design to optimize the process. By leveraging relational databases and XML files, a substantial volume of building model data was processed through data mining techniques, resulting in the construction of a comprehensive model. The findings from the application study of a teaching building’s architectural structure design demonstrate that adopting BIM technology for building structure design yields superior efficiency and fewer complications. Hence, this research provides valuable insights into the potential benefits of utilizing BIM technology in the construction industry.
Analytical Methods for Building Information Modeling Based on RVT Files
Authors: Xu Chun , Xiao Zhengxing
Published: December 2024

With the digital transformation of architecture, construction drawings have evolved from CAD flat maps to three-dimensional building information models (BIM). Commonly, BIM software includes Autodesk’s Revit, Bentley’s MicroStation, Dassault Systèmes’ CATIA, and Trimble’s Tekla. Revit is the most widely used modeling software in the current architectural design market, which can generate project files with the RVT extension. This paper elaborates on an analytical method for building information models based on RVT files. Specifically, by studying the parsing of geometric and semantic information from RVT files and attribute extraction, data representation, and data storage, this study offers results that apply to automated compliance checks during drawing construction. By comparing directory trees between standard models set by teachers and target models by students, automated scoring for architectural engineering education can be accomplished based on a preset rubric. Furthermore, automatic accounting and alerts for building carbon emissions can be conducted by parsing the models to create a bill of quantities database and relying on predetermined carbon emission calculation standards.
Research on Accelerated Infiltration Technology Applied to Soft Foundation Treatment for Sponge City Water Storage
Authors: Liu Shaopeng , Tang Guoyi , Han Jinyang
Published: December 2024

Soft soil foundation is widely distributed in China, especially in coastal, river, and lake urban areas. In recent years, the country has strengthened the construction of sponge cities, requiring cities to enhance their ability to store, infiltrate, and retain water. This study focuses on strengthening the infiltration effect while treating soft soil foundation, and enhancing the city’s ability to regulate and store rainwater. Setting up pile foundations in soft foundation treatment is a conventional and mature approach. This study conducted targeted research by setting sponge permeable piles to enhance the water permeability of pile foundations. Through indoor model tests, the sponge permeable pile structure is in the shape of a tube well, with a height of 1.5 m. The upper part of the sponge pile is 0.5 meters high, and 20% hornblende, 30% rock debris sandstone, and 30% crystalline limestone are selected. A 1m clay layer of absorbent material is set in the lower part to study the effects of different sponge pile diameters, depths, and water volumes on the infiltration head line, The design key parameters of the storage pile foundation used for the treatment of sponge urbanization soft soil foundation that can be used as a storage and drainage promotion sponge.
Mechanical Properties of Macro Basalt Fibre Reinforced Self-Compacted High-Performance Concrete
Authors: Alraeeini Ahmed Saleh , Nikbakht Ehsan
Published: December 2024

The characteristics of self-compacted high-performance concrete (SCHPC) exhibit significant differences when compared to vibrated high-performance concrete (HPC). SCHPC often encompasses a greater proportion of mineral admixtures, higher paste volumes, and reduced binder to water ratios compared to conventional HPC. The incorporation of fibres into HPC results in a substantial improvement in its mechanical characteristics. This study examined the impact of including macro basalt fibres (MBF) on the mechanical properties of SCHPC. Additionally, a comparison was made between the performance of MBF and traditional hooked steel fibres. The MBF is deemed as a type of minibar comprised of basalt fibre reinforced polymers (BFRP). The lengths of the MBF were measured to be 24 mm with diameter of 0.7 mm. The weight percentages of MBF incorporated into SCHPC was 25% only relative to the weight of hooked steel fibre. Hence, this study aimed to evaluate the impact of MBF on several mechanical properties of SCHPC including compressive strength, flexural strength, and tensile strength. The compressive strength and flexural strength exhibited values that demonstrate a comparable level of performance to that of hooked fibres. But the tensile strain of MBF was found to be lower than that of hooked steel fibres. At the end, promoting the use of MBF to replace steel fibre is a novel contribution toward provide durable, sustainable and corrosion free of self-compacted concrete to be used in offshore structure and coastal areas.
Study on Strengthening Treatment of Recycled Aggregate and the Effect on the Mechanical Properties of Concrete
Authors: Yan Xiaohui , Liu Ting , Zhang Bei
Published: December 2024

With the acceleration of modern industry and urbanization, the construction industry worldwide is also in a period of rapid development, followed by the annual production of tens of millions of tons or even hundreds of millions of tons of construction waste. Building a resource-saving and environment-friendly society and efficiently realizing the reduction and recycling of construction waste are world-recognized important measures to protect the environment. In this paper, the strengthening methods of recycled aggregate and effect on the mechanical properties of concrete are investigated. The methods of physical strengthening, chemical strengthening and microbial sedimentation to improve the properties of recycled aggregate, as well as the effect on the mechanical properties of concrete are reviewed. The existing problems and the direction of further research are analyzed. The research results of this paper could provide theoretical guidance for the durability research and high performance design of recycled aggregate concrete, and provide necessary data and theoretical support for the revision of relevant technical standards in the future.
An Experimental Study on Internal Curing of Concrete with the Inclusion of Recycled Superabsorbent Polymer (SAP)
Authors: Jindal Abhishek , Mehra Divya
Published: December 2024

Concrete, as a widely used construction material, is prone to various issues such as early-age shrinkage, cracking, and reduced durability. Internal curing, a technique aimed at providing a continuous source of moisture within the concrete matrix, has come to light as a possible approach for above mentioned issues. This study investigates the utilization of hydrogel (as a recycled form of SAP) derived from ice gel packs as an Internal Curing Agent (ICA) in concrete. Ice gel packs, commonly used for cold therapy (in many industries such as the medical field, cold storage, etc) contain Superabsorbent Polymers (SAPs) that can absorb and release moisture. By repurposing these gel packs, this study explores the feasibility and effectiveness of the hydrogel in internal curing, evaluating its impact on workability, strength development, water absorption, and its optimal amount/ dosage (i.e. percentage replacement of cement) etc. This study also investigates the mix design considerations, and potential challenges associated with incorporating hydrogel into concrete. The findings show that the mechanical properties were improved i.e. compressive, split tensile, and flexural strength at 28 days were increased by 9.83%, 8.94%, and 17.52% respectively. Also, the optimum amount used for SAP was identified as 0.7% (which is percentage replacement of cement). These findings contribute to advancing knowledge on the use of ice gel pack-derived hydrogel for internal curing, paving the way for more sustainable and durable concrete structures.
Experimental Study on Mix Ratio of High Performance Marine Concrete Mixed with Fly Ash and Mineral Powder
Authors: Wang Fuchang , Sun Yilin , Wang Weiyao , Wang Zhijie , Wang Xueyu
Published: December 2024

Improving the durability of marine concrete and extending the service life of engineering structures are important directions in marine concrete research. This paper designs three cementitious material ratio systems: cement only, cement mixed with fly ash, and cement mixed with both fly ash and mineral powder, and experimentally studies the mixing ratio of high-performance marine concrete. The results indicate that the slump of the newly mixed concrete is more significantly increased by the addition of fly ash than mineral powder. Mineral powder is more effective in reducing the air content of the fresh concrete, with a reduction of 43.4% at a 30% replacement level. The strength of concrete mixed with two types of cementitious materials decreases at 7 and 28 days, and the strength loss in the aged stage is less for concrete mixed with mineral powder. Compared to the cementing material with fly ash, the electrical flux of concrete with mineral powder is lower, indicating better durability. The optimal content of fly ash and mineral powder is proposed to enhance the compressive strength and chloride penetration resistance of marine concrete, providing guidance for the mix ratio design of marine concrete.
Research on the Tensile Properties of Ultra-High Toughness Cement-Based Composites
Authors: Liu Yun , Lai Jie , Liu Yuan
Published: December 2024

To better guide engineering practice, this study investigated the mechanical properties of ultra-high toughness cement-based materials and conducts tensile mechanical experiments related to the materials. The experiments indicated that as the content of aramid fibers increased, the tensile strength initially increased and then decreased, reaching a maximum of 5.67 MPa at a fiber content of 0.1%. The ultimate tensile strain shown an initial decrease followed by an increase, but it did not exceed 3%. In terms of failure phenomena, at the initial loading stage, the stress-strain relationship of the specimen was linear due to the low load, and there was no noticeable change in the specimen. However, as the load increased, the first crack began to appear on the surface of the specimen, entering the elastoplastic phase, and the mode of failure transitions from single crack failure to stable failure with multiple cracks. According to data analysis, only four sets of experiments had ultimate tensile strains exceeding 3%. The failure mode shifts from a single crack to a stable failure with multiple cracks. As the load continues to increase, the width of the surface cracks enlarges
Improvement of Early Strength of Slag Containing Portland Cements
Authors: Kryvenko Pavlo , Rudenko Igor , Konstantynovskyi Oleksandr , Kovalchuk Artem
Published: December 2024

The implementation of alkali-activated Portland cements (or alkali-activated slag cement as per the Ukrainian National Standard DSTU B V.2.7-181:2009) in materials for repair and retrofitting (repair concretes and mortars, shotcrete concretes, reactive powder concretes) is effective is due to their conformity with modern trends in construction. The actuality to produce of alkali-activated Portland cements using the one-part technology causes the application of sodium silicate as the most effective activator in a solid aggregate state. Application of proposed alkali-activated Portland cements in mentioned materials for repair and retrofitting requires finding ways to maximize early strength. The factors affecting early strength were determined using alkali-activated Portland cement based on sodium metasilicate pentahydrate. Modification of alkali-activated Portland cement with a complex additive of the system “surfactant – salt of a strong acid” resulted in an increase in strength from class 42.5 N to 42.5 R due to a reduction in water content and an increase in the crystallization of hydrates. The application of a complex additive also ensured the extension of initial setting time from 30 min up to 40 min and the final setting time – from 40 min to 50 min. An additional increase in the activity of the cement aluminosilicate component was achieved by increasng the specific surface area and introducing nanosilica. The combination of these recipe and technological factors resulted in a rapid-hardening alkali-activated Portland cement with a strength class of 52.5 R.
The Influence of the Cavitation Phenomenon on the Uniformity of Distribution of Fibrous Reinforcing Fillers in Cement Compositions
Authors: Fakhritdinovich Bakhriev Nuritdin , Safarovich Maxammatov Muzaffar , Ugli Shomirzaev Shokhrukh Bokhodir , Shokhsanam Alieva
Published: December 2024

Scientific research and analysis of available data show that the production of roofing sheet materials based on basalt fibers is rich in extremely relevant and innovative ideas. This article presents the results of scientific research in the production of basalt fiber composite roofing materials – aimed at solving problems in terms of obtaining a uniformly dispersed molding suspension. Unlike asbestos-cement molding mixtures, basalt-cement molding mixtures have some unique features. The problem is that when basalt fiber structures are mixed with water and cement, large lumps of basalt fiber are formed. Solving the problem of dispersing fiber elements and uniform distribution throughout the entire volume creates a very favorable promise for obtaining a high-strength roofing sheet. The authors made an attempt to implement the idea by using effective non-asbestos composite sheet roofing materials based on basalt fiber elements using cavitation intensification of the process of mixing the molding sand.
Suitability of Industrial Plastic Waste and Cement for Fabrication of Compressed Stabilised Earth Blocks
Authors: Deboucha Sadek , Ziani Hocine
Published: December 2024

The availability of local materials such as soils and industrial plastic waste (IPW) encourages us to investigate this research, to contribute to the reduction of construction costs. This research studied materials in terms of mechanical properties in order to make compressed stabilized earth blocks (CSEB) with suitable characteristics. The addition of 5% to 15% of IPW and 2% to 4% cement to the soil under 3 MPa and 4 MPa static compaction. The results obtained showed that the addition of IPW and cement improved the characteristics of CSEB by increasing compressive strength, which reached 3 MPa and 1.8 MPa in wet and immersed conditions, respectively, under 3 and 4 MPa compaction pressure. Furthermore, the addition of IPW and cement ranged the flexural strength between 3 and 4.5 MPa for both wet and immersed conditions under 3 and 4 MPa compaction pressure. Based on these results, local soil, IPW, and cement can be used to produce CSEB as construction materials.
Experimental Investigations on the Production of Ceramic Tiles Using Glass Powder
Authors: Pillai Geethika G
Published: December 2024

In industry, as well as in cities, a large amount of solid waste is produced, some of which is partially recycled or is disposed of in its entirety in landfills, thereby generating negative environmental effects. Industrial waste glass from numerous applications as a major source of pollution because only an estimated 30% is reused globally. In the search for an alternative outcome for waste, various applications have arisen, some of which are related to constructions sector. Here, the use of waste from glass bottles, soda- lime and window glass, used in its entirety as a raw material in the manufacture of ceramic tiles. The use of these wastes contributes to environmental sustainability and generating more friendly building products. This project explores the development of ceramic tiles using glass powder through eco-friendly and natural methods without the reliance on machine setups. By incorporating glass powder into traditional ceramic tile production, the study aims to reduce environmental impact while maintaining product quality. Natural methods such as hand-mixing and sun-drying are employed to eliminate the need for machinery, making the process accessible and sustainable. The project investigates the feasibility, durability, and aesthetic appeal of these tiles, considering their potential application in eco-conscious construction practices. Through experimentation and analysis, this research contributes to sustainable material innovation in the field of ceramic tile production.
Optimization of Sectional Capacities of Cold-Formed Steel Channel Sections with Perforations
Authors: Vu Quoc Anh , Pham Ngoc Hieu , Thinh Van Thanh , Nguyen Ngoc Thang
Published: December 2024

Perforated cold-formed steel members are extensively used to facilitate the installation of technical systems. The presence of these holes, however, can diminish the capacities of such members. To address this concern, the capacities of such steel sections are determined by using the Direct Strength Method according to the AISI S100-16. This approach employs elastic buckling analyses to predict the strengths of cold-formed steel (CFS) sections or members. Applying this method, the study investigates the influence of varying web hole sizes on the sectional strengths of CFS channel sections. The elastic buckling analyses are carried out by utilizing a CUFSM software module introduced by the American Iron and Steel Institute. Obtained results provide insights for analyzing and selecting suitable web hole dimensions to enhance the strengths of these channel sections. It revealed that the sectional capacities can reach the optimal values with the hole heights varying between 0.4 and 0.5 times of the investigated section depths.
Development Mix Design Alkali-Activated Cement Powder Concrete
Authors: Helevera Oleksandr , Razsamakin Andrii , Rudenko Igor , Konstantynovskyi Oleksandr , Smeshko Volodymyr
Published: December 2024

The development of reactive powder concretes based on alkali-activated cements for the construction and protection of critical infrastructure is of worldwide importance for improving the safety of their exploitation. The factors influencing the kinetics of strength gain and drying shrinkage of reactive powder concretes using sodium silicate pentahydrate as an alkaline activator were determined. It was shown that increasing the ratio of alkali-activated cement to sand from 1/3 to 1/1 and using the activator in the liquid state increased the concrete strength gain: the compressive strength was 52.3 MPa, 85.0 MPa, 100.6 MPa, and 116.7 MPa at 1, 3, 28, and 90 d. The ratio of compressive strength to flexural strength was in the range of 5.3…5.9 after 28 d, indicating high fracture toughness of the concrete. Higher content of alkali-activated cement caused a decrease in the influence of sand granulometry on concrete strength. This was due to “floating” placement of aggregate in the cement matrix. The introduction of fine calcite as an additive ensured to reduce the shrinkage of concrete by 1.3…1.5 times at 90 d due to the densification of the microstructure and the intensification of crystallization processes. The implementation of these measures resulted in high strength alkali-activated cement reactive powder concrete of strength class C80/95, high fracture toughness, and reduced drying shrinkage.
Analysis of Hengshan Reservoir Dam Breach Flood Evolution and Impacts Based on Mike Modeling
Authors: Li Hanze , Wang Liang , Wu Wenhua , Fan Yazhou , Li Da , Zhang Xinhai
Published: December 2024

Carrying out dam-break flood simulation and accurately predicting the propagation and advancement process of dam-break flood are important measures to effectively deal with reservoir dam failure. This paper takes the Hengshan Reservoir in Ningbo, Zhejiang as the research object, diagnoses and analyzes the dam failure forms under different influencing factors through the accident tree method, and couples DB-IWHR and Mike21 technology to construct a flood evolution model under the reservoir dam failure scenario. The development process of dam-break flood under 6 different working conditions when the dam breaks instantly and gradually is simulated. The flood elements such as the submerged water depth and arrival time of each control section and control point in the study area are obtained to evaluate the regional life and economic losses. The research results can provide decision-making basis for local flood control command departments at all levels to fight against floods, rescue and disaster relief, reduce the impact of flood disasters, and provide technical support for regional urban construction comprehensive planning.
Comprehensive Impact Assessment Technology for Inter-Basin Water Transfer
Authors: Fan Xinying , Yan Dengming , Jing Laihong , Li Chaoqun , Du Lin , Zhang Yu , Lu Yisi , Cang Bo
Published: December 2024

In recent decades, with the significant increase in the number of inter-basin water transfer projects, their comprehensive impact assessment has become one of the core issues in the feasibility study of large-scale inter-basin water transfer projects. This article systematically summarizes the current practical problems and needs in the comprehensive impact research of inter-basin water transfer projects through a combination of literature research and engineering practice. This paper compares and analyzes the advantages and disadvantages of comprehensive impact assessment techniques from the aspects of comprehensive impact assessment index system, comprehensive impact assessment methods and models, and proposes a comprehensive impact assessment method for inter-basin water transfer. This study provides a reference for scientifically evaluating the comprehensive impact of future inter-basin water transfer projects on ecological environment, economy and society, and optimizing water transfer plans.
An Integrated Use of Geographical Information System (GIS), Entropy, Multivariate Methods, and Map Overlay Techniques for Spatiotemporal Variability Analysis of Surface Water Quality in Baitarani River Basin, Odisha
Authors: Das Abhijeet
Published: December 2024

The present study area has a growing need for surface water of superior quality. The study area’s continued urbanization and extensive irrigation are gravely endangering the quality of the surface water. So, this study examines the surface water quality in Baitarani Watershed, Odisha. Water samples were collected from eleven sampling locations. This investigation relies on entropy (E) and multivariate statistical techniques including cluster analysis (CA), Geographical Information System (GIS), principal component analysis (PCA), to assess the variations of surface water quality in the selected regions. The statistical results show the cations’ predominant decreasing order: Ca2+>K+>Fe2+, and in anions, Cl–>SO42–>NO3–>PO43–. The study’s results of entropy were mapped out using GIS technology. Based on the EWQI, 30.77% were unsuitable for drinking. The CA method employed in this study, generated three clusters according to the similarity of their respective characteristics. A total of five components, as determined through PCA, explained 93.248% of the observed variance. From the results, surface runoff, storm runoff, organic waste, soil weathering, leaching, domestic discharge and agricultural runoff were identified as significant contributors to the deterioration of surface water quality. The majority of the water samples (9 locations) in the vicinity are acceptable for consumption, according to the current investigation. Three water sites such as L-(8), (11), (12) and (13) indicate polluted drinking water quality. Therefore, this study emphasizes the relevance and efficacy of entropy, CA and PCA for accomplishing sustainable water resource management while recognizing the sources of water quality variations. Hence, the present study will support planners of surface water treatment initiatives in susceptible areas.
Analysis of the Influence of Constrained Shape on the Bulging Deformation of Geomembrane
Authors: Chen Fengzhen , Yang Zhe , Liu Xueqin , Wang Wansheng , Pu Yongcheng , Li Wanglin
Published: December 2024

The bulging deformation constraint environment of the anti-seepage geomembrane for the plain reservoir is relatively complex, but it is not the ring restrained currently used. Based on the research results of the laboratory bulging deformation test and numerical simulation of the geomembrane under ring restrained, the numerical simulation under the non-ring constraint conditions of the triangle, quadrilateral, and Pentagon was carried out using mechanical simulation and numerical simulation, and then the influence of the constraint shape on the bulge deformation characteristics of the geomembrane was analyzed. The results show that the failure mode and location of the bulging deformation of the geomembrane under different constraint shapes are similar, all occurring at the crown in an elliptical tearing shape. The change in constraint shape does not affect the failure trend of the bulging deformation of the geomembrane. With the increase in the number of constraint sides (ring as n sides), geomembrane bulging deformation bulging pressure and the number of constraint edges is positively related to the height of the bulging was negatively related to it. The research results can be used to analyze the damage of geomembrane bulging deformation.
Numerical Analysis of Offshore Anchor Pile Under Uplift Forces
Authors: Sharma Abhishek , Singh Kanwarpreet
Published: December 2024

Mooring is the process of securing a vessel, offshore structure, or other floating structures in a fixed position relative to a reference point. The success of mooring systems depends on factors like vessel dimensions, site environment, and water depth. A thorough analysis and realistic behavior prediction, appropriate methodologies and mathematical models, are essential to have a successful mooring system. Various offshore structures, such as Floating Production and Storage Offloading (FPSO), Tension Leg Platforms (TLP), Mobile Offshore Production Units (MOPU), and semi-submersibles, underscore the broad applications, require robust mooring solutions. This study investigates the performance of anchor pile beneath the sea bed, emphasizing its suitability for safeguarding offshore structures against various forces such as wind, waves, and earthquakes. Unlike previous research primarily focused on land applications, the current study focuses on analysing how anchor pile parameters beneath the seabed respond to uplift loads during mooring. The study explores the influence of anchor pile geometry, specifically variations in diameter and length, on soil-pile interaction. Prescribed displacements of 10%, 15% and 20% of the pile diameter was applied on the pile top to the mooring system and the result load was calculated. The findings of the study suggest that increasing both anchor pile diameter and length improves uplift capacity. Furthermore, a slight increase in uplift capacity with higher displacement is linked to improved soil compaction, causing alterations in particle arrangement and reinforcing resistance. In conclusion, the study asserts that anchor pile systems are well-suited for offshore structures, especially in addressing uplift forces.
Influence Mechanism of Loading Rate and Size Effect on Altered Rock Mechanical Properties
Authors: Li Xiaolong , Zhang Chong , Zhang Shunli
Published: December 2024

Rock is a typical heterogeneous material, and its mechanical properties are influenced by its own material characteristics and external loading methods. For altered rocks, this characteristic is more pronounced. Taking surface granite-altered rock in the underground engineering of a Hydropower Station as research object, loading rate and size effect on altered rock mass mechanical properties were tested, peak stress, peak strain, elastic modulus, and failure mode of the specimens were studied sequentially. Results show that peak strength increases with the increase of loading rate, which is similar to that of hard brittle rock mass without alteration. At the same loading rate, peak strength decreases with the increase of specimen size. Relationship between peak strain, elastic modulus and loading rate of specimens with different sizes is discrete. Failure mode of the specimen is still the brittle rock mass, which indicates that the surface alteration carried out in this experiment will not significantly change the failure characteristics of the granite sample.
Microseismic Activity Characteristics of Rockmass Failure in the Drainage Tunnel Under Excavation Disturbance at Yebatan Hydropower Station
Authors: Zhang Shunli , Hao Jianjun , Li Xiaolong , Zhu Xinhao , Wang Qing
Published: December 2024

The underground powerhouse of the Yebatan Hydropower Station is subject to high ground stress, with the rockmass displaying well-developed native and structural features, including faults, squeezed and crushed zones, and joint fractures. Construction projects frequently encounter rockmass failures, which result in delays to the construction schedule. Microseismic monitoring technology was used to analyze the microseismic activity characteristics related to rockmass block failures caused by excavation disturbances at the intersection of Drainage Tunnel #2 and the outlet shaft. The results reveal that microseismic events are concentrated in macroscopic failure zones. Initially, the cumulative energy rises rapidly, then increases slowly, and subsequently rises quickly again. The stress concentration distribution the energy index continuously increases and remains high before suddenly decreasing, growing slowly, and then decreasing abruptly again before increasing. The cumulative apparent volume experiences a rapid increase, followed by a gradual rise, and ends with a sudden increase. Furthermore, this study offers a comprehensive analysis of the damage evolution and mechanisms of the surrounding rock, with the findings providing valuable insights and practical guidance for construction practices.
Laboratory Study on Settlement Performance of Floating Stone Column
Authors: Ng Kok Shien , Ghani Mohamad Irfan Bin Ab , Azahari Muhamad Hariz Bin , Omar Nik Aslam Hafiz Bin Nik , Azmi Yusof Iskandar Bin
Published: December 2024

Floating stone columns have been used occasionally to improve soft soils. However, the efficiency of the floating columns is questionable due to the untreated zone below the columns’ tip. This study aimed to investigate the effect of column length and area replacement ratio on the settlement performance of improved ground with floating stone columns. A small-scale unit cell model tank was used in this experimental study where the influential area of a single column was considered. Uniform loading was applied on the stone column improved soil, and the consolidation settlement was recorded. The results on the end bearing columns and floating column were compared. Laboratory results showed the beneficial impacts of larger area replacement and longer column on reducing the settlements and increasing the consolidation rate. The results were further compared with existing solutions where good agreement was obtained. The experimental findings presented in this study contributed to a better understanding of the behavior of large group floating stone columns.
Correlation Analysis Between Compressibility Index and Physical Property Index of Cohesive Soil in Guinea Coastal Site
Authors: Duan Qingsong , Zhou Huan , Ding Jihui
Published: December 2024

With the continuous development of infrastructure construction in Guinea by China, research on the geotechnical properties of Guinea has become increasingly important. The clay layer of a coastal site in Guinea is mainly within a range of 25 m, ranging from very soft clay to stiff clay. The variation range of moisture content, density, porosity, liquid limit, and plasticity index is large. By conducting statistical and regression analysis on the main physical indicators and compression index of the cohesive soil in the site, the correlation and related fitting expressions of the main physical indicators of the coastal clay are given; The correlation and fitting expression between compressibility index and main physical index; Among the existing fitting formulas for the compression index Cc, the fitting formula between the compression index Cc and the liquid limit wL has a large degree of discreteness, followed by the fitting formula between the compression index Cc and the porosity e, while the fitting formula between the compression index Cc and the moisture content w has the smallest discreteness; The fitting formulas for Azzouz’s compression index Cc and moisture content w, as well as compression index Cc and porosity e, are basically consistent with the accuracy of the fitting formulas in this article. ranging from very soft clay, soft clay to hard clay,
Experiment on the Influence of Saturation on Poisson’s Ratio of Soil
Authors: Wu Fan , Zhao Zhi , Xu Liang , Ding Rui , Tao Shuai
Published: December 2024

Small strain stiffness characteristics are critical to predict the deformation caused by the interaction between soil and structures, especially masonry foundations and settlement-sensitive structures. Among them, the importance of Poisson’s ratio has not attracted enough attention in the study of small strain stiffness of unsaturated soils in the past. For fine-grained soils with significant volume change, the compression characteristics of soils under different saturations are different, which means that Poisson’s ratio is a function of saturation or matric suction. Using the relative humidity control method, the variation law of Poisson’s ratio with saturation was obtained through indoor elastic wave velocity and volume change test. The results show that when the sample is saturated, the value of Poisson’s ratio ν is between 0.49 and 0.5, and the soil is in an approximate incompressible state. With the decrease of saturation, the ν decreases linearly with the saturation. The ν of the silt decreases rapidly when the saturation is between 96 and 85%, and then fluctuates around 0.37 without obvious change. Compared with sand and silt, the saturation has a more significant effect on the Poisson’s ratio of clay.
Bayesian Probabilistic Approach for Underwater Blast Damage Identification of Gravity Dams Based on Modal Parameters
Authors: Liu Yijia , Zhou Chuiyi , Wang Yongming , Ren Jinming , Zhong Weibin , Li Ruize
Published: December 2024

In response to the challenge of identifying damage caused by underwater explosions in gravity dams, this paper proposes a Bayesian probability method for damage identification in gravity dams based on modal parameters. The support vector regression based on particle swarm optimization (SVR-PSO) method is employed for modal parameter estimation. According to the single-damage identification results obtained in gravity dam blasting craters, it is observed that the damage identification model based on dominant frequencies and mode shapes exhibits significantly improved performance in damage identification and noise resistance compared with a model considering only dominant frequencies. In the context of identifying multiple types of damage, such as blasting craters, dam heel cracking, and slope cracking in gravity dams, it is evident that the damage to the dam heel and slope has a far larger impact on the dam’s modes than blasting craters. Consequently, the identification results of heel cracking and slope cracking exhibit higher reliability than those of blasting craters.