Subject:
All Disciplines Arts & Humanities Biology & Life Sciences Business & Economics Chemistry & Materials Science Computer Science & Mathematics Engineering Environmental & Earth Sciences Medicine & Pharmacology Physical Sciences Public Health & Healthcare Social Sciences
Sort:
Most Viewed Latest Alphabetical (A-Z) Alphabetical (Z-A)
Filter:
All Topic Review Biography Peer Reviewed Entry Video Entry
Topic Review
Resilience and Systems
Resilience is a growing area of interest and study, but it has a variety of origins and apparent inconsistencies across disciplines. 
  • 608
  • 11 Jul 2022
Topic Review
Soil Erosion Due to Defective Pipes
Sinkholes are a significant underground hazard that threatens infrastructure and lives and sometimes results in fatalities. The annual cost of sinkhole damages exceeds $300 million, although this estimate is likely underestimated due to the need for national tracking. Sinkholes can also alter natural drainage patterns, leading to increased flood risk. While natural sinkholes occur, those in urban areas are predominantly manmade, caused by soil erosion from defective pipes, typically due to aging. Climate change, storm surges, and urbanization have accelerated subsidence in urban environments, posing greater risks to critical infrastructure and densely populated areas. Extensive research has focused on soil erosion in dams; however, this knowledge does not necessarily apply to erosion through orifices, where gravity and other factors play significant roles. 
  • 604
  • 11 Aug 2023
Topic Review
Construction Workforce Safety
Construction work is a hazardous job. Some construction site jobs include: building houses, roads, tree forts, workplaces and repair and maintain infrastructures. This work includes many hazardous task and conditions such as working with height, excavation, noise, dust, power tools and equipment. The most common fatalities are caused by the fatal four: falls, being struck by an object, electrocutions, and being caught in between two objects. Construction work has been increasing in developing and undeveloped countries over the past few years. With an increase in this type of work occupational fatalities have increased. Construction workforce safety is a multidisciplinary field concerned with the safety, health, and welfare of people at a construction site. The goal of the construction workforce safety is to foster a safe and healthy construction environment.
  • 594
  • 31 Jan 2021
Topic Review
Waste as Cement Replacement in Foamed Concrete
Foamed concrete is a lightweight construction material that has gained popularity due to its excellent thermal and acoustic insulation properties. Foamed concrete production involves using cement as a binding agent, which results in a high carbon footprint. In response to sustainable development goals (SDG), there has been a growing interest in exploring alternative materials that can replace cement to improve energy efficiency, climate change, resource efficiency, and overall improvement of foamed concrete properties.
  • 592
  • 22 Mar 2023
Topic Review
Factors Affecting Carbonate Crystallization in EICP Treatment
Urea hydrolysis involves the breakdown of urea in water. The result of this reaction forms calcite in the presence of a calcium source. The reaction can be 10 to the power of 14 times faster than the chemical (un-catalysed) urea hydrolysis in the presence of a catalyst (urease enzyme). The improvement in EICP treatment is based on the precipitation of calcium carbonate within the treated soil matrix. It is thus important to shed light on the crystallographic patterns, such as size, shape, and distribution of precipitates since they play a significant role in defining the mechanical properties of EICP bio-cemented soils. The main factors that affect crystallization are the temperature, urease activity, pH level of the cementing solution, and concentration of cementation solution. These factors are discussed in some detail below.
  • 591
  • 24 Jan 2022
Topic Review
Mine Tailings-Based Geopolymers: Durability Properties
The mining industry produces a considerable amount of stone waste and tailings, posing an environmental danger. It is recyclable by a variety of methods, including the promising geopolymerization method. This literature evaluation indicates knowledge gaps that must be addressed to enhance mine tailings composites for geopolymers.
  • 589
  • 27 Dec 2022
Topic Review
Natural Pozzolan in Concrete
For several decades, class F fly ash has been an attractive supplementary cementitious material, at least in part, due to its ability to reduce Portland cement consumption and mitigate alkali-silica reactions in concrete. However, fly ash availability is becoming uncertain as the energy industry decommissions coal burning power plants as it transitions to renewable energy production. This situation creates a need to identify viable and sustainable alternative supplementary cementitious materials. There are several types of supplementary cementitious materials, such as natural pozzolans, metakaolin, or ground granulated blast-furnace slag, which appear to be potential alternatives to fly ash in concrete. In this research, a locally available natural pozzolan (pumicite) was selected to replace fly ash in concrete. After conducting alkali-silica reaction tests on mortar mixtures, rheological and strength properties, shrinkage, resistance to freezing and thawing, and chloride ion permeability of concrete mixtures containing different amounts of fly ash and natural pozzolan were evaluated. The results showed that pumicite was more effective than fly ash at mitigating the alkali-silica reaction, and a pumicite content of 20% was necessary to mitigate the alkali-silica reaction. Ternary mixtures containing both pumicite and fly ash were the most effective cementitious materials combinations for mitigating the alkali-silica reaction expansion. Additionally, pumicite provided acceptable compressive strength and modulus of rupture values (greater than 4.0 MPa) that exceeded the flexural strengths provided by established mixtures containing only fly ash. Shrinkage and durability factor values for all mixtures were less than 710 μstrain and greater than 75, which are generally considered acceptable. Additionally, all mixtures with acceptable alkali-silica reaction expansions had very low chloride permeability. These results indicate that pumicite can be a reliable alternative for fly ash.
  • 585
  • 16 Nov 2023
Topic Review
Sustainable Road Safety in Saudi Arabia
Understanding the causes and effects of road accidents is critical for developing road and action plans in a country. The causation hypothesis elucidates how accidents occur and may be applied to accident analysis to more precisely anticipate, prevent, and manage road safety programs. Driving behavior is a critical factor to consider when determining the causes of traffic accidents. Inappropriate driving behaviors are a set of acts taken on the roadway that can result in aberrant conditions that may result in road accidents.
  • 584
  • 25 May 2022
Topic Review
Systematic Literature Review of Open Infrastructure BIM
Representation and modeling using the building information modeling (BIM) methodology of civil works have become the subject of increasing attention, thanks to the potential offered by Open Infrastructure BIM (I-BIM). However, the complexity of infrastructure works, i.e., the variety of construction and technological systems, makes Open I-BIM very complex and challenging. The lack of systemic knowledge on the subject is another challenging factor. 
  • 582
  • 07 Jul 2023
Topic Review
3D Printing in the Building Industry
The technology of additive manufacturing, especially 3D concrete printing (3DCP), has been adopted in the construction industry as a viable alternative to traditional construction methods. Although the technology offers a wide variety of structural, economic, and environmental benefits, it is still restricted in use due to certain limitations that are still under research.
  • 580
  • 14 Apr 2023
Topic Review
Durability Aspects of Basalt Fiber Reinforced Concrete
The creation of sustainable composites reinforced with natural fibers has drawn the interest of both industrial and academics. Basalt fiber (BF) stands out as the most intriguing among the natural fibers that may be utilized as reinforcement due to their characteristics. Numerous academics have conducted many tests on the strength, durability, temperature, and microstructure characteristics of concrete reinforced with BF and have found promising results. However, because the information is dispersed, readers find it problematic to assess the advantages of BF reinforced concrete, which limits its applications.
  • 579
  • 02 Mar 2023
Topic Review
Causes of Asphalt Pavement Blistering
No theoretical model effectively explains the blistering process, which provokes functional distress in asphalt pavements worldwide. Over the years, it has been possible to observe blistering on many asphalt pavements, collect information related to the specific contexts of its occurrence, and formulate hypotheses on the potential causes.
  • 579
  • 13 Mar 2024
Topic Review
Performance of Unreinforced Masonry Walls in Compression
Unreinforced masonry (URM) is a construction of brick or concrete block unit that is joined together using mortar, without steel reinforcement. Because of the heterogeneous nature and difference in mechanical properties of the masonry elements, analyzing and capturing the structural behaviour of URM walls under various loading conditions is therefore complex. 
  • 575
  • 06 Dec 2023
Topic Review
Analysis of the Lignosulfonate Reinforcement Mechanism
As an organic material with large reserves and environmental protection, the application of lignin in loess improvement can greatly improve the engineering properties of loess, such as water loss disintegration and water collapsibility. The microscopic results show that the incorporation of lignosulfonate produces a three-dimensional network structure, which can effectively cement loess particles and improve soil strength and impermeability, and the Quantity of this network structure depends on the amount of lignosulfonate.
  • 574
  • 11 Oct 2022
Topic Review
Time-Cost Optimization Models in Construction Management
The construction sector is a crucial contributor to the national and global economy. Therefore, improving the efficiency and effectiveness of construction projects can have a significant impact on gross domestic product (GDP). However, managing construction projects can be challenging due to the uncertainties and complexities involved. The three primary interrelated constraints of construction projects, namely, time, scope, and cost, require effective management to ensure successful completion. To optimize the time and cost of construction projects, various optimization models and techniques have been proposed. 
  • 574
  • 06 May 2023
Topic Review
Definitions of BIM by Organizations and Standards
The first documented representation of the concept of BIM—“building information modelling” was a scientific article by Giles A. (Sander) van Nederveen and Frits P. Tolman, which so named the techniques for multi-faceted representation of a building using views of its model.
  • 573
  • 27 Dec 2023
Topic Review
Sustainable Recovery of Architectural Heritage
Rey Prendes House is representative of one hundred and forty-five houses made of wood, stamped steel sheet, and deployé that are located in the historical center of San Salvador. Its origin is linked to historical events, such as the strong migration of foreigners to El Salvador in the late nineteenth and early twentieth century, the presidential decrees that encouraged the reconstruction of the city with anti-seismic materials as a result of the earthquakes of 1873 and 1917. More recently, since 2017, Rey Prendes House has been included in the project funded by the Italian Agency for Development Cooperation. The phases of the survey are documented with both materials and degradation analyses, the new design construction with BIM technology for the organization of the educational construction site, the creation of offices and laboratories for restoration and treatments of timber and metal details. 
  • 567
  • 28 Mar 2022
Topic Review
Orthotropic Steel–UHPC Composite Deck
Although orthotropic steel decks (OSDs) have been widely used in the construction of long-span bridges, there are frequently reported fatigue cracks after years of operation, and the bridge deck overlay also presents severe damage due to OSD crack-induced stiffness reduction. Ultra-high performance concrete (UHPC), recognized as the most innovative cementitious composites and the next generation of high-performance materials, shows high strength, ductility, toughness, and good performance on durability. After its first application to the OSD bridge in the early 2000s, the orthotropic steel–UHPC composite deck has been comprehensively studied worldwide.
  • 567
  • 14 Aug 2023
Topic Review
Lime Mortar
Lime is an ancient construction material that has been utilized throughout the world in various forms, providing stable construction methods in usable conditions. Lime mortar is well known for its low carbon footprint in production and carbon absorption throughout its lifespan as a hardened material. The significant benefits of lime mortar were analyzed and reviewed for further research. Ancient lime constructions need proper maintenance for aesthetic and structural strengthening to preserve this cultural architecture of national pride. Hence, the characterization of ancient mortars is mandatory for renovation work. 
  • 565
  • 10 Jun 2022
Topic Review
Urban-Scale Physics-Based Building Energy Modeling
Urban building energy modeling (UBEM) is a practical approach in large-scale building energy modeling for stakeholders in the energy industry to predict energy use in the building sector under different design and retrofit scenarios. UBEM is a relatively new large-scale building energy modeling (BEM) approach which raises different challenges and requires more in-depth study to facilitate its application. 
  • 561
  • 23 Nov 2022
  • Page
  • of
  • 23
Featured Entry Collections
>>

Featured Books

>>
Encyclopedia of Social Sciences
Encyclopedia of COVID-19
Encyclopedia of Fungi
Encyclopedia of Digital Society, Industry 5.0 and Smart City
ScholarVision Creations
Feedback