Showing papers in "Cement based composites in 2023"
TL;DR: In this article , steel fibers were employed to replace 1, 1.5, 2, and 2.5 percent of the total volume of concrete, and a total of five mixed designs were conceived and constructed.
Abstract: The engineering properties of high-strength concrete are significantly different from those of ordinary concrete, and as a result, this concrete has become popular in a variety of applications, including the construction industry, particularly for tall buildings, bridges with long spans, and precast members. Reinforcing high-strength concrete using fibers is a common method for increasing ductility without losing strength. In this study, steel fibers were employed to replace 1, 1.5, 2, and 2.5 percent of the total volume of concrete, and a total of 5 mixed designs were conceived and constructed. The findings showed that the addition of steel fibers up to 2% by volume boosted the compressive strength and decreased at 2.5% by volume. The incorporation of steel fibers has diminished the mixes' durability.
TL;DR: In this article , the authors studied the tensile behavior of lightweight structural concrete containing steel fibers and nanosilica reinforcing pozzolan, using tensile strength as one of the influencing factors.
Abstract: The low strength of lightweight aggregates diminishes the strength of lightweight concrete, and the concrete's fragility impedes the ductile behavior of structures subjected to seismic stresses. The use of reinforcing materials and fibers may increase the strength of lightweight concrete by compensating for the impact of reduced strength caused by the use of lightweight particles and preventing the rapid breakdown of concrete. The performance of the materials used is an effective determinant of structural member behavior. Therefore, for computational analysis of finite elements to accurately anticipate the behavior of structural parts, precise behavioral models of materials are required. This study studied the tensile behavior of lightweight structural concrete containing steel fibers (at a volume percentage of 1%) and nanosilica reinforcing pozzolan (at a weight percentage of between 1 and 3%), using tensile strength as one of the influencing factors. together with the strain corresponding to the maximal stress. The inclusion of steel fibers and nanosilica had the largest influence on enhancing the tensile behavior of lightweight concrete, according to the data. By adding 3% nanosilica and 1% steel fibers to light concrete, the direct tensile strength has risen by 74%. In addition, the indirect tensile strength is somewhat greater in all samples than the direct tensile strength.
TL;DR: In this paper , the authors examine the long-term strategy in civil engineering and explore the role of environmental sustainability throughout the various stages of the civil design process, including the conceptual stage, the technical design stage, and the building stage.
Abstract: In terms of the impact of human activity on the natural environment, civil engineering is one of the most significant productive pursuits. The production and use of building materials, the advancement of engineering and construction, the use of the project after it is completed, the removal of discarded components, and other procedures all require significant energy expenditure and ongoing waste generation, which can have severe consequences for the natural environment. To meet the demands of both economic and social development, advancements in civil engineering must be made while also protecting the natural world, limiting the use of natural resources, and promoting sustainable development. This study examines the long-term strategy in civil engineering and explores the role of environmental sustainability throughout the various stages of the civil design process, including the conceptual stage, the technical design stage, and the building stage. The research finds that the construction industry should adopt practices that adhere to sustainability principles such as environmentally-friendly design, durability, energy efficiency, waste reduction, improved indoor air quality, water conservation, and the use of sustainable building materials in construction.
TL;DR: In this article , glass powders are replaced with cement (by weight) at 0, 5, 10%, 15% and 20% and mechanical and durability performances are investigated, compressive and flexural strength, flow test, abrasion resistance, sulfate resistance and capillary water absorption test were conducted.
Abstract: Lately, because of the pollution caused by cement production waste materials that can be used instead of cement aroused interest by researchers. Glass is one of these waste materials. Glasses due to their nonbiodegradable properties, cause serious environmental risks and recycling this waste material would minimize these environmental concerns. Therefore, finely granulated glass powders, due to their high silicious content are being used as pozzolanic admixture. In this study, glass powders are replaced with cement (by weight) at 0%, 5%, 10% and 15%. And mechanical and durability performances are investigated. Compressive and flexural strength, flow test, abrasion resistance, sulfate resistance and capillary water absorption test were conducted. Results indicated that an increase in glass powder dosage in cement mortars leads to decrease in mechanical properties.