The effect of silica fume on the washout resistance of environmentally friendly underwater concrete with a high-volume of siliceous fly ash

Kumar, Boddapati Ganesh; Muthu, Murugan; Chajec, Adrian; Sadowski, Łukasz; Govindaraj, V.

doi:10.1016/j.conbuildmat.2022.127058

Cited by 19 publications

(4 citation statements)

References 51 publications

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“…As SF particles are extremely fine as compared to OPC particles, therefore, these can occupy the volume between OPC particles, resulting in increased compaction and densification. SF is a highly reactive pozzolan that can improve the packing density of the concrete particles, leading to a denser mixture [49]. The fine particles of silica fume can fill the voids between the larger particles of the other components, resulting in a more compact mixture.…”

Section: Slumpmentioning

confidence: 99%

Effect of Silica Fume on Engineering Performance and Life Cycle Impact of Jute-Fibre-Reinforced Concrete

Brito

2023

Sustainability

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The brittleness of plain concrete (PC) is a result of its lack of tensile strength and poor resistance to cracking, which in turn limits its potential uses. The addition of dispersed fibres into the binding material has been demonstrated to have a positive impact on the tensile properties of PC. Nevertheless, using new or engineered fibres in concrete significantly increases the overall cost and carbon footprint of concrete. Consequently, the main obstacle in creating environmentally friendly fibre-reinforced concrete is the traditional design process with energy-intensive materials. This study investigated how the engineering properties and life cycle impact of concrete were influenced by varying the volume fractions of jute fibre (JF). The impact of incorporating silica fume (SF) as a partial replacement of Portland cement was also studied. The studied parameters included mechanical behaviour, non-destructive durability indicators, and the life cycle impact of concrete using JF and SF. The efficiency of JF in mechanical performance improved with the increase in age and with the addition of SF. When using both SF and 0.3% JF, there was an improvement of around 28% in the compressive strength (CS). When 0.3% JF was added, in the presence and absence of SF, the splitting tensile strength (STS) improvement was around 20% and 40%, respectively. The addition of JF improved the residual flexural strength (FS) and flexural ductility of PC. The SF addition overcame the drawbacks of the poor resistance of JF-reinforced concrete (JFRC) against water absorption (WA) and rapid chloride ion penetration (RCIP).

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Section: Slumpmentioning

confidence: 99%

Effect of Silica Fume on Engineering Performance and Life Cycle Impact of Jute-Fibre-Reinforced Concrete

Brito

2023

Sustainability

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“…Research has shown that when an ACM, such as fly ash (FA) [12][13][14], granulated blast furnace slag (GBFS) [12], or silica fume (SF) [15], is added to cement, the slow pozzolanic Materials 2024, 17, 752 2 of 17 effect reduces the strength of cement-based materials during the early hydration period, although their strength improves in the later hydration period. The proportion of cement replaced by mineral admixtures in the above studies was mostly 5-20%.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Performance Study of High-Strength and Corrosion-Resistant Cement-Based Materials Applied in Coastal Acid Rain Areas

Wang,

Zhang,

et al. 2024

Materials

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Investigations regarding the preparation and durability of cement-based materials applied in specific coastal acid rain environments are scarce, particularly those involving the addition of four auxiliary cementitious materials (ACMs) to cement for modification. To improve the durability of concrete structures in coastal acid rain areas, a systematic study was conducted regarding the preparation of high-strength and corrosion-resistant cement-based materials using ACM systems composed of fly ash (FA), granulated blast furnace slag (GBFS), silica fume (SF), and desulfurization gypsum (DG) instead of partial cement. Through an orthogonal experimental design, the effect of the water–binder ratio, cementitious ratio, and replacement cement ratio on the compressive strength, corrosion resistance coefficient, and chloride ion permeability coefficient of the materials were analyzed and the mix proportions of the materials were evaluated and optimized using the comprehensive scoring method. The results show that implementing a FA:GBFS:SF:DG ratio of 2:6:1:1 to replace 60% of cement allows the consumption of calcium hydroxide crystals generated through cement hydration, promotes the formation of ettringite, optimizes the pore structures of cementitious materials, and improves the compressive strength, acid corrosion resistance, and chloride ion permeability of the materials. This study provides a reference for selecting concrete materials for buildings in coastal acid rain environments.

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“…The primary conclusions related to the effect of SF involved a loss of workability and compressive strength as the SF percentage increased. Although this study focused on UWC, it did not record the type and doses of Anti-Wash Admixture (AWA) [18]. Another study explored the incorporation of 10% SF with two common AWAs: welan gum and a cellulose-based anti-washout.…”

Section: Introductionmentioning

confidence: 99%

Evaluating Fresh Properties of Non-Dispersive Reactive Powder Concrete: A Novel Approach

Al-Saffar,

Al-Shathr,

Abed

2023

MMEP

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A novel testing methodology was developed in this study to efficiently evaluate the non-dispersibility of Reactive Powder Concrete (RPC) that does not disperse (Non-Dispersive RPC or NDRPC) -a concrete variant derived from the amalgamation of RPC and non-dispersive concrete. To study the fresh behavior of NDRPC, a series of fourteen mixes were prepared, each incorporating an Anti-Wash Admixture (AWA) concentration ranging between 0.5% and 2%. Fresh state properties were identified through a series of Slump Flow, V Funnel, L-box, and Setting Time tests, while washout resistance was determined through modified Stream Test, Turbidity, and pH tests. The findings constitute the first efficient evaluation of the non-dispersibility of fresh Self-Compacted Mortar (SCM) or concrete mixtures when placed underwater, as ascertained by V Funnel and L-box tests under similar conditions. Experimental results indicated a synergistic effect between AWA and High Range Water Reducer Admixture (HRWRA) concentrations on the properties, which could be counterbalanced by increasing the incorporation of silica fume to 30%. Notably, a significant reduction in washout loss was observed when silica fume replacement was increased to 30%.

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The effect of silica fume on the washout resistance of environmentally friendly underwater concrete with a high-volume of siliceous fly ash

Cited by 19 publications

References 51 publications

Effect of Silica Fume on Engineering Performance and Life Cycle Impact of Jute-Fibre-Reinforced Concrete

Effect of Silica Fume on Engineering Performance and Life Cycle Impact of Jute-Fibre-Reinforced Concrete

Preparation and Performance Study of High-Strength and Corrosion-Resistant Cement-Based Materials Applied in Coastal Acid Rain Areas

Evaluating Fresh Properties of Non-Dispersive Reactive Powder Concrete: A Novel Approach

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