Papers by Keyword: Silica Fume

Abstract: The partial substitution of cement with ground blast furnace slag (GGBS) and silica fume (HS) in the concrete mix has the potential to reduce the carbon footprint associated with cement production. The objective of this study is to evaluate the feasibility of this partial replacement as a strategy to promote greater sustainability in construction. The research looks at four replacement percentages with different ratios: 10% HS, 10% GGBS, a combination of 10% GGBS and 10% HS, and 13% GGBS with 10% HS. The results indicate that the mixtures obtained not only reach but exceed the required strength of f´c=280 kg/cm² and have a reduced carbon footprint compared to conventional concrete. This highlights the environmental benefits of using industrial by-products as partial replacements in concrete manufacturing, helping to mitigate the negative impacts of cement production.

Abstract: In this experiment cement was exchanged with varying amounts of rice husk ash and silica powder sf such as 10%,15% and 20% to examine the features of the resulting concrete according to research M30 grade demonstrates great compressive and split tensile strength and performs best in 15% transfer the effects of substituting 15% of cement with RHA and SF on the overall properties of concrete are demonstrated in detail which contributes to a better understanding and development of building practices.

Abstract: In the construction sector, concrete is indispensable. Non-structural uses account for a significant portion of concrete production. Foamed concrete (FC) is incredibly porous, and as the number of voids increases, the material's thermal characteristics decrease. Since these uses need a substantial amount of concrete, researching them might yield useful information for optimizing concrete's material efficiency and making better use of its waste products. FC is excellent in compression but poor in tension because it creates multiple microcracks. FC cannot withstand the tensile stress induced by the applied forces without additional reinforcement elements. Hence, this research investigates the mechanical properties of polypropylene (PP) fibers based foam concrete. The utilization of effective materials such as cement, flyash, silica fume and PP fibre were used in this investigation. In this study, a novel invention is proposed for designing and strength prediction of foam concrete and find out the strength properties such as compressive strength, split tensile strength and flexural strength of fibre reinforced foam concrete were determined and the experimental and predictive value of compressive strength were also determined with the help of python. The results provide a clear idea of ​​the efficient use of fly ash and silica fume for the manufacture of light weight based products that promote profitability, sustainability and entrepreneurship for youth in developing countries such as India, and it is important by conserving natural resources through savings in the consumption of cement and aggregates.

Abstract: Production of the hollow concrete blocks is always facing the issues on its weight and carbon emission. The use of alternative materials may help to reduce the weight and environment issue in producing the hollow concrete blocks. This paper investigates the use of alternative materials in fabricating the hollow concrete blocks. Three alternative materials used in this study were silica fume (SF), coated expanded polystyrene beads (CEPS) and powder free latex glove (PFLG). CEPS and PFLG were used to replace partial of sand in mixtures. Meanwhile, SF was used to replace the partial of cement in mixture. All these three materials were used in different mixtures of concrete mortar. There were 18 specimens fabricated made of each mixture (control specimen, SF, CEPS and PFLG). The specimens then tested with compressive strength, water absorption, density and initial rate of suction. The results show that the compressive strength and density of the hollow concrete blocks made of SF was higher than the control samples. But the water absorption percentage and initial rate of suction of hollow concrete blocks made of SF were lower than control specimens. Contrary, the compressive strength, water absorption, density and initial rate of suction of the specimen made of CEPS beads and PFLG were lower than control specimens. It was concluded that the SF can increase the compressive strength and make the blocks denser. Meanwhile, CEPS beads and PFLG can reduce the weight but the compressive strength also decrease about 40%-50%.

Abstract: The present study investigates the effect of incorporating metakaolin and silica fumes in the production of high-strength concrete along with partial replacement of coarse granite aggregates in the high-strength concrete. The higher compressive strength, refined microstructure, and decreased permeability of high-strength concrete are some of the properties responsible for its trending use in the modern construction industry. The main purpose of this research is to evaluate the effect of the replacement of coarse granite aggregates with natural aggregates on the mechanical and durability properties of high-strength concrete. For understanding the effect of metakaolin, silica fume, and granite aggregates on the properties of high-strength concrete, various specimens such as cubes, cylinders, and cylindrical discs were cast and tested after 7, 14, and 28 days of curing. Various concrete mixes were prepared by adding silica fume at 5%, 7.5%, and 10% and metakaolin at 5%, 7.5%, 10%, 12.5%, and 15% in concrete production. Furthermore, High-strength concrete mixes were also prepared by replacing natural coarse aggregates with granite coarse aggregates by 25%, 50%, 75%, and 100% to study the effect of replacement percentage on the concrete properties. Test results indicated that the compressive strength and split tensile strength of the concrete mix increased with the increase in the replacement percentage of granite aggregates, with the highest strength seen at complete replacement with granite aggregate due to the enhanced compressive strength of such aggregates in comparison with the natural coarse aggregates. In various mixes cast using metakaolin and silica fume, the highest compressive strength was seen in a mix containing 10% metakaolin and 7.5% silica fume, and results of other mixes indicated that the use of silica fume and metakaolin are viable options for high-strength concrete production in our experimental study.

Abstract: This investigation inspects the concurrent influence of steel fibers with different materials such as Fly Ash(FA), Silica Fume(SF) and aggregates on the mechanical behaviour of geopolymer concrete (GPC) mixes. A range of 8 to 16 molar NaOH molarities variation was observed in the experimental work. Sodium hydroxide molar (NaOH) and sodium silicate solution (NaOH) were utilised as alkaline activators in proportions of 1, 1.5, and 2 (Na₂SiO₃/NaOH). Steel crimped fibers having aspect ratio of 60 were added in the geopolymer concrete. Geopolymer concrete properties considering type of fly ash, the quantity of fly ash, silica fume, the content of fine aggregate and coarse aggregate, effect of sodium hydroxide concentration, content of sodium silicate solution and inclusion of 0.2% of steel fibers in the geopolymer concrete are analyzed.

Abstract: The rapid construction activity in Malaysia has increased the demand of concrete. One of the key ingredients in concrete is cement. The production of cement emits carbon dioxide (CO₂) which is harmful to the environment. To overcome this issue, waste materials such as eggshell powder (ESP) and silica fume (SF) are incorporated in concrete as partial replacement to cement. In this research, the characterization and strength activity index (SAI) of ESP and SF as partial cement replacement were performed. The results showed that only SF was classified as pozzolanic materials of Class F, as specified in ASTM C618. Meanwhile, ESP had higher loss on ignition (LOI) than SF, hence contained higher amount of unburnt carbon. SF mortar had the highest SAI and compressive strength due to the small size of SF particles. Although ESP mortar fulfilled the minimum requirement of SAI as specified in ASTM C618, its compressive strength was lower than the Ordinary Portland Cement (OPC) mortar because the LOI content of ESP was more than 20%.

Abstract: The high demand of concrete has increased the rate of the ecosystem as well as increase the carbon emissions of the cement industry. The rapid growth of construction puts a severe strain on our natural resources and endangers the environment. Therefore, there is a pressing need for a green alternative that will protect the environment and preserve resources. Hence, this study is carried out to reduce the usage of cement in concrete production. The new replacement technique utilized the magnesium-rich synthetic gypsum (MRSG) and silica fume (SF). The MRSG and SF will be used as partial replacement of cement in the range of 5% to 30% with a water to cement ratio of 0.55. These mixtures were formed into cube specimens of 100 x 100 x 100 mm size. Then, the compressive strength was conducted to determine the strength of the specimens. The results indicated that 10% cement replacement from 5% of MRSG residue and 5% of SF gives an optimum strength compared to the control specimen with 24.6 MPa and 25.8 MPa, respectively. In addition, the increased percentage of MRSG residue, increased the water absorption of the mix. The replacement of MRSG residue in concrete would not only provide economic relief but also help to create a sustainable and pollution-free environment as the disposing of this waste creates many inconveniences to the living organism.

Abstract: Ordinary Portland Cement (OPC) used in building structures has a negative impact. The presence of CO2 emissions produced becomes very dangerous. To reduce this impact, materials that are more environmentally friendly are used. Silica Fume and liquid carbon dioxide (CO2) are among them. In this study, silica fume and liquid carbon dioxide were used as a substitute for cement. The effect of the stiffness of the two materials and the earthquake lateral load was tested by looking at the response of the high-rise building. Through numerical simulations, we compare the mode shape, displacement of the structure, and the sheer force experienced by the structure.

Abstract: The construction industry has recently focused on the use of sustainable and innovative building materials, which called for the production of many supplementary cementitious materials with concrete to make the concrete produced durable and sustainable. Since high-strength concrete has many advantages other than its high strength, it has recently been used in non-traditional applications after for a long time confined to well-known traditional applications. This study presents the effect of micro Ferrosilicon (FS) and mineral materials on high-strength concrete properties, where silica fume (SF), FS, and metakaolin (Mk) were used as additives to cement.Besides the consistency test, all-ages compressive strength, splitting tensile strength, modulus of elasticity strengthand water permeability were investigated on the produced HSC.Microstructure analyses are carried out by SEM and EDX tests. The results showed a continuous decrease in a slump with the increase in mineral material, however, 15% FS and 15% MK were determined as the optimum percentage of the desired mechanical property. HSC performs up to 88 MPa compressive strength, 7.49 MPa tensile strength, and 39.89 GPa modulus of elasticity, as well as good durability properties. Finally, the high-strength concrete under consideration is suitable for use in both conventional and non-conventional applications and supports sustainable development and infrastructure development.