Topic Review
Mine tailings-based geopolymers:  leaching properties
The mining sector generates a substantial quantity of stone waste and tailings, which constitutes an environmental risk. It can be recycled using a number of processes, such as the promising geopolymerization technique. This review identifies knowledge gaps that must be filled in order to advance mine tailings composites for geopolymers.
  • 15
  • 03 Dec 2022
Topic Review
Mine tailings-based geopolymers: properties
The mining sector generates a substantial quantity of stone waste and tailings, which constitutes an environmental risk. The most prevalent method for disposing of this industrial waste is dumping, which contributes to soil deterioration and water contamination while acquiring precious land. It can be recycled using a number of processes, such as the promising geopolymerization technique, which transforms waste into value. This study reviews current developments in the manufacturing of mine tailings-based geopolymer composites from industrial waste as a possible sustainable building material. This paper also gives in-depth studies on the characteristics and behaviors of mine tailings composites used in geopolymer manufacturing, including durability, microstructure, thermal and leaching properties. This review also identifies knowledge gaps that must be filled in order to advance mine tailings composites for geopolymers.
  • 26
  • 03 Dec 2022
Topic Review
Retrofitting and Strengthening of Structures
In civil engineering since antiquity, structural repair has been a very particular problem. Throughout history, human-constructed buildings have been destroyed due to time, natural disasters, and even building mistakes. In this respect, the field of engineering related to structural reconstruction and recovery seeks to identify methods and techniques to accomplish this important task. The pace of the degradation of concrete buildings throughout the world is frightening. It has now been verified that even if the structural design complies with all particular building code criteria such as concrete quality, cover, and so on, there is still an acceptable high risk of concrete degradation and reinforcing corrosion. Steel corrosion has been identified as the most severe cause of reinforced concrete degradation, capable of causing fractures, spalling the concrete cover, reducing the effective c/s area of the reinforcement, and ultimately leading to collapse. In order to repair and rehabilitate other buildings, this study sought to compile the main ideas, methods, and technologies used by these influential engineers. In fact, this report contains case studies on functional restoration. The document further addresses various types of building, such as pre-stressing, post-tensioning, deployment, and pre-stressing.
  • 25
  • 03 Dec 2022
Topic Review
Ultra-high-performance fiber-reinforced concrete: Fresh properties
UHPC is a cement-based composite that is used in new construction and/or renovation of existing structures to increase their service life. It is a unique composite material that may be used as an alternative to concrete in harsh conditions. Following decades of research and development, a wide range of commercial UHPC compositions are now accessible across the world to fulfill the growing number of applications and demand for high-quality construction materials. Although UHPC has significant advantages over conventional concrete, its use is limited because of rigid design restrictions and excessive pricing. As a consequence, a detailed analysis of UHPC's durability qualities is necessary to provide critical information for material testing requirements and methods, as well as to widen its practical applications. The goal of this study is to learn more about UHPC and to encourage more research and use of UHPC.
  • 23
  • 03 Dec 2022
Topic Review
Ultra-high-performance fiber-reinforced concrete: Applications
UHPC is a type of cement-based composite used in new construction and/or rehabilitation of existing buildings to extend service life. It is a novel composite material that can serve as an alternative to concrete construction in hostile climates. Following decades of study and production, a diverse variety of commercial UHPC compositions are now available globally to meet the rising number of applicants and demand for high-quality building materials. Although UHPC offers major benefits over normal concrete, its utilization is restricted due to restrictive design rules and exorbitant costs. As a result, a thorough examination of the durability properties of UHPC is required to give important information for material testing requirements and processes, as well as to broaden its practical uses. This report is aimed at increasing basic understanding of UHPC and supporting more UHPC research and applications.
  • 32
  • 03 Dec 2022
Topic Review
Optimal Scheduling of Hydro-Wind-Solar Hybrid Systems
In order to establish a hydro-wind-solar hybrid system, the control of multiple power sources and the coordination and real-time scheduling between multiple power sources must be solved. The realization of a multi-energy complementary system first needs to pay attention to the form in which dozens or even hundreds of wind and solar power plants participate in power generation scheduling, how to predict and describe their power generation laws, and the risks brought about by their uncertainties, in addition to to paying attention to the coordinated operation of hydropower stations and large-scale wind power stations on multiple time scales.
  • 13
  • 03 Dec 2022
Topic Review
Applications of Kapok Fiber
Photocatalytic Kapok fiber is recognized as one of the most resilient and effective material sources accessible for environmental rehabilitation and energy production due to its exceptional photocatalytic performance, hollow structure, great renewability, and compressibility. There are, however, few detailed reviews on this matter with strong photocatalytic activity. Therefore, the most recent explosive advancement in photocatalytic kapok fiber, including various kapok fiber materials and overall fabrication methodologies, was examined to evaluate this advanced research. Pollutant absorption, photocatalytic degradation, hydrogen production, and CO2 reduction were the main applications of this photocatalytic Kapok fiber.
  • 13
  • 03 Dec 2022
Topic Review
Properties and Applications of Geopolymer Mortar
Classic cement mortar is often utilised as a standard binding and repairing material in various engineering structures. Many scholars have addressed GPM’s viability and potential applications as a suitable replacement for regular cement mortar. Sathonsaowaphak was the first to investigate geopolymer mortar and studied the properties of bottom ash fineness, ash/liquid alkali ratio, NaOH/Na2SiO3 ratio, NaOH dosage, water to ash ratio, and superplasticiser on the behaviour in terms of workability and compressive strength of GPM. Geopolymer mortar has a mechanical strength of 24–58 MPa, and adding NaOH solution improves the workability performance of GPM without reducing strength. According to the results of Detphan and Chindaprasirt, who prepared GPC using rice husk ash and fly ash and activated by NaOH and NaSiO3 solution as a liquid for the mix, they found that the maximum strength of GPM is acquired by employing a Na2SiO3-to-NaOH mass ratio of four. Moreover, more discussion about geopolymer mortar properties is reported in the following sections.  
  • 40
  • 02 Dec 2022
Topic Review
Gowind-Class Corvette
The Gowind design is a family of steel monohull corvettes developed since 2006 by France 's Naval Group, formerly known as DCNS, to conduct missions in littoral zone such as anti-submarine warfare (ASW). The Gowind family includes vessels with lengths from 85 m to 102 m and displacement from 1,000 t to 2,500 t. The Gowind design can deploy Unmanned Aerial Vehicles (UAVs), Unmanned Surface Vehicles (USVs) and Underwater Unmanned Vehicles (UUVs). An aft deck has been provided allowing for a 10-ton class helicopter or Unmanned Aerial Vehicle (UAV) operations. The platform's weapon system consists of a multi-functional radar and MICA SAM. It is armed with Exocet anti ship missiles. The propulsion system is based on Combined Diesel and Diesel (CODAD) and includes water-jets for improved maneuverability in shallow waters and high-speed performance. There is no funnel (smokestack) on these ships. The radar and other sensors are mounted on a single central mast thus allowing 360-degree view. Naval Group offers two variants of the design: Gowind 1000 and Gowind 2500.
  • 9
  • 02 Dec 2022
Topic Review
Over the Shoulder Shot
The over the shoulder shot (OTS) is a camera angle used in film and television, where the camera is placed above the back of the shoulder and head of a subject. This shot is most commonly used to present conversational back and forth between two subjects. With the camera placed behind one character, the shot then frames the sequence from the perspective of that character. The over the shoulder shot is then utilised in a shot-reverse-shot sequence where both subject's OTS perspectives are edited consecutively to create a back and forth interplay, capturing dialogue and reactions. This inclusion of the back of the shoulder allows audiences to understand the spatial relationships between two subjects, while still being able to capture a closer shot of each subject’s facial expression. In film and television, the filmmaker or cinematographer’s choice of an OTS shot’s camera height, the use of focus and lenses affect the way audiences interpret subjects and their relationships to others and space.
  • 7
  • 02 Dec 2022
  • Page
  • of
  • 428
Top
Feedback