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This paper presents the effects of silica fume on compressive strength, splitting tensile strength, resistance against …
This research aims at investigating the effect of adding Fly ash (FA) and Silica Fume (SF), water/cement ratio (w/c), and curing time (t) on the compressive strength (CS), flexural strength (FS) and tensile strength (TS) of normal strength concrete (NSC) high strength concrete (HSC) up to 90 days of curing. This research mainly aims to …
Granulated blast furnace slag, class F fly ash and silica fume were used in this study. Their chemical composition determined by X-ray fluorescence (XRF) is presented in Table 1.The specific surface areas of slag, fly ash and silica fume were 426, 305 and 18,650 m 2 /kg, respectively. Fig. 1 shows the particle size distributions of slag, fly ash and silica fume.
The production of cement releases an enormous amount of CO2 into the environment. Besides, industrial wastes like silica fume and fly ash need effective utilization to reduce their impacts on the environment. This research aims to explore the influence of silica fume (SF) and fly ash (FA) individually and combine them as binary cementitious …
Abstract. This study focuses on the various strength and durability performance of high-strength concrete (HSC) combining different low-carbon and high-silica content percentages of Rice Husk Ash (RHA) and Silica fume (SF). RHA with proportions of 5%, 10%, 15% and 20% and 10% SF by weight of cement was compared with control …
Some researchers used to add the silica in the construction material i.e. concrete. And some of them replace the some other material with silica fume. The effect of adding and replacing the silica on the mechanical properties of concrete as studied by various scientists and researchers are discussed in this section. 6.
Breathing in very small ("respirable") crystalline silica particles, causes multiple diseases, including silicosis, an incurable lung disease that leads to disability and death. Respirable crystalline silica also causes lung cancer, chronic obstructive pulmonary disease …
This paper presents the effect of silica fume and glass fibre in High Performance Concrete (HPC). In this study, High Performance Concrete mixes with silica fume of 0, 10, and 20% with addition of ...
Micro silica and silica fume, which were used in different proportions as cement substitutes, had different effects on the void ratios. While the void ratios of the mortars containing silica fume were lower than those of the control samples, the void ratios of the micro silica-containing mortars were higher than the control samples.
Thus, the current experimental study was carried out to investigate the effect of silica fume (SF) replacement (5, 10 and 15%) on mechanical properties of concrete for water to binder ratios (0.5 ...
Kumar R, Dhaka J (2016) Partial replacement of cement with silica fume and effects on concrete properties. Int J Technol Res Eng 4(1):86–88. Google Scholar Memon FA, Nuruddin MF, Shafiq N (2013) Effect of silica fume on the fresh and hardened properties of fly ash-based self-compacting geopolymer concrete. Int J Mine Metal Mater …
The micro-filler effect and pozzolanic effect of silica fume improve the bonding between cement paste and steel fibre. This improvement encourages the anti-cracking effect of steel fibre in RAC beam. The incorporation of 1% steel fibres could increase the fracture toughness of RAC by over 50% at below 200 ℃ and by over …
Considering that the use of silica fume anticipated the formation of the peak but reduced its intensity, it can be inferred that its effect during the first hours of curing consists mainly in ...
Silica fume's benefits are already evident in the fresh concrete state before it begins to harden. Its small particle size which is 100 times finer than ordinary portland cement complements the finess modulus of concrete and provides a ball-bearing effect, which improves thixotropic behavior, in effect modifying concrete viscosity. Because of ...
In this paper fly ash based geopolymer concretes with different percentages of silica fume were made by using NaOH/sodium silicate and cured in an oven at 100 °C. Workability, compressive strength, flexural and tensile strengths were determined. Portland cement concrete was used as a reference. Sodium hydroxide (14 M) and sodium silicate …
Güçlüer et al. investigated the effect of silica fume as a cement replacement, and fly ash was completely replaced with siliceous aggregates. In their study, 3%, 5%, 9%, and 12% of cement were …
The unique physical and chemical properties of silica fume enhance the compressive strength and water resistance of cement mortar. The study aims to investigate the effect of silica fume in cement mixes in terms of strength-gaining characteristics and water-resistance attributes. The silica fume was added in amounts of 0%, 10%, 20%, …
Silica fume is very active and has very good pozzolanic properties. Silica fume is frequently used due to its usefulness in concrete [29, 30].With the introduction of silica fume plasticizers, it has been used as an additive in concrete or as an additive in cement production in recent years [31–34].For the reasons stated, it is considered the …
effects of Silica Fume and Fly Ash on the properties of concrete. Water-binder ratio was kept 0.42 for all cases and the specimens were tested at ages of 7, 14 and 28 days.10% Silica
Silica fume has a specific surface area of about 20000 m 2 /kg as that of 225 to 300 m 2 /kg of cement, which is responsible for the compressive strength and durability of concrete.Silica fume is also known as …
Data indicate that silica fume accelerates cement hydration at high water/cementitious ratios and retards hydration at low water/cementitious ratios. On the other hand, fly ash retards cement hydration more significantly at high water/cementitious ratios. When silica fume and fly ash are added together with cement, the reactivity of the …
Adding about 8% of silica fume in the filling material can improve the filling, stability, and mechanical properties of the backfill slurry. The silica fume mixed into the …
The quality of silica fume is associated with the quantity of silica content [45, 46]. The use of SF in the concrete increases the water requirement because of its ultra …
The study aims to investigate the effect of silica fume in cement mixes in terms of strength-gaining characteristics and water-resistance attributes. The silica fume was added in amounts of 0%, 10 ...
The effect of silica fume on compressive strength at early ages was not significant, even up to 28 days. It became obvious at late ages (i.e. 56 and 90 days). Coarse silica fume agglomeration results in nonefficient improvement on compressive strength. The size of agglomerated silica fume controls the properties of blended cement pastes.
However, fume at W/B= 0.35 significant difference can be perceived in case of comparing 10% and 15% silica fume content 3.2 Tensile strength of concrete 118 CESDOC 2016 Results of splitting tensile strength of concrete with varying percentages of silica fume at water-binder ratio of 0.30 is shown in Fig. 3.
The synergistic effect of nano-silica and silica fume increases hydration products, optimizes pore structure and reduces porosity. The synergistic effect of silica fume with nano-silica can increase the hydration products, reduce the total porosity and optimize pore size distribution at different ages, which can improve the strength of concrete.
🕑 Reading time: 1 minute Silica fume concrete is composed of cement, silica fume, fine aggregate, coarse aggregate, and water. Fresh and hardened properties of silica fume concrete is superior to conventional concrete. For instance, it has higher compressive and flexural strength. The durability of this type of concrete is superior to conventional …
Silica Fume. Silica fume (SF) is a very fine noncrystalline silica produced in electric arc furnaces as a by-product of elemental silicon, which maintains the pozzolanic reactivity and has a bulk effect when incorporated into cementitious matrices. From: Construction and Building Materials, 2022. View all Topics.
Silica fume (SF) is a very fine noncrystalline silica produced in electric arc furnaces as a by-product of elemental silicon, which maintains the pozzolanic reactivity and has a bulk …