Effect of silica fume on durability of self-compacting concrete made with waste recycled concrete aggregates

Sasanipour, Hossein; Aslani, Farhad; Taherinezhad, Javad

doi:10.1016/j.conbuildmat.2019.07.324

Cited by 117 publications

(41 citation statements)

References 50 publications

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“…The other composites were characterized by higher porosity rates. Similar results were presented in [23]. The authors claim that the silica fume can reduce water absorption and porosity.…”

Section: Highly Reactive Pozzolanssupporting

confidence: 78%

The Effect of Aggregate Shape on the Properties of Concretes with Silica Fume

Strzałkowski

Garbalińska

2020

Materials

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The paper examines the impact of aggregate shape on the compressive strength and thermal properties of concretes with silica fume based on two different aggregates: natural round gravel aggregate and crushed basalt aggregate. Compressive strength and thermal properties of individual concretes were determined during the first year of specimens curing. Additionally, porosity tests were conducted using mercury intrusion porosimetry and optical porosimetry. Mercury porosimetry tests showed that the use of silica fume led to a decrease in the content of pores of size smaller than 0.15 µm compared to the reference concretes without the addition of silica fume. However, tests carried out on crushed basalt-based concrete showed the presence of numerous additional pores with diameters ranging from 0.05 to 300 μm. In case of natural round gravel aggregate-based concrete, the addition of silica fume brought about an increase in its compressive strength. In turn, basalt-based concrete exhibited notably lower compressive strength values due to significantly higher porosity within the range of more than 70 μm. In basalt concrete, the obtained λ values are much lower than in concretes with normal gravel aggregate. In addition, the specific porosity structure had its impact on the process of drying of specimens of each group which occurred at a significantly faster rate in the basalt-based concrete. In conclusion, it can be stated that the use of crushed basalt aggregate causes a significant aeration of concrete, even despite the use of silica fume. As a result, the concrete based on crushed aggregate is characterized by a definitely lower compressive strength, but also better thermal insulation properties compared to analogous concrete made on natural round gravel aggregate.

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“…The other composites were characterized by higher porosity rates. Similar results were presented in [23]. The authors claim that the silica fume can reduce water absorption and porosity.…”

Section: Highly Reactive Pozzolanssupporting

confidence: 78%

The Effect of Aggregate Shape on the Properties of Concretes with Silica Fume

Strzałkowski

Garbalińska

2020

Materials

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“…In addition, concrete has been produced with traditional supplementary cementitious materials (SCMs) that possess a high pozzolanic activity [10], such as fly ash (FA) [11][12][13][14], silica fume (SF) [15][16][17] and ground granulated blast slag (GGBS) [2,[18][19][20][21] that yielded notable improvement in strength and durability. Numerous industrial solid by-products containing calcareous siliceous, and aluminous materials (fly ash, ultrafine fly ash, silica fume, etc.…”

Section: Introductionmentioning

confidence: 99%

End-of-Life Materials Used as Supplementary Cementitious Materials in the Concrete Industry

et al. 2020

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A sustainable solution for the global construction industry can be partial substitution of Ordinary Portland Cement (OPC) by use of supplementary cementitious materials (SCMs) sourced from industrial end-of-life (EOL) products that contain calcareous, siliceous and aluminous materials. Candidate EOL materials include fly ash (FA), silica fume (SF), natural pozzolanic materials like sugarcane bagasse ash (SBA), palm oil fuel ash (POFA), rice husk ash (RHA), mine tailings, marble dust, construction and demolition debris (CDD). Studies have revealed these materials to be cementitious and/or pozzolanic in nature. Their use as SCMs would decrease the amount of cement used in the production of concrete, decreasing carbon emissions associated with cement production. In addition to cement substitution, EOL products as SCMs have also served as coarse and also fine aggregates in the production of eco-friendly concretes.

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“…Others studies have made similar observations to those noticed in this investigation. Sasanipour, Aslani [20] also observed a decrease in compressive strength in SSC with silica fumes partial cement replacement. Rantung, Supit [2] observed a decrease in compressive strength in SSC with fly ash partial cement replacement.…”

Section: Compressive Strengthmentioning

confidence: 82%

“…No relationship was observed between moisture absorption and compressive strength. Sasanipour, Aslani [20] observed that silica fumes in SSC (developed with waste concrete aggregates) has less moisture absorption and porosity. In terms of the pore properties, an optimum of 5% silica fume in SSC was observed by Zarnaghi, Fouroghi-Asl [21].…”

mentioning

confidence: 99%

Evaluation of fresh and hardened properties of blended silica fume self-compacting concrete (SCC)

Ofuyatan¹,

Adeniyi²,

Ighalo³

2021

Res. Eng. Struct. Mater.

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Recent technologies now investigate the use of materials that can serve as partial cement replacement and also impact on self-compacting ability in concrete mixtures. In this study, fresh and hardened properties of selfcompacting concrete containing silica fumes as partial replacement for cement were evaluated. Cement was replaced by silica fume in the extent of 15%, 25% and 35% by volume alongside the control mix (0%). The flow test, V-funnel test and L-box test were conducted on the fresh concrete. The compressive strength, flexural strength, water absorption property and microstructural properties of the hardened concrete were determined. Utilisation of silica fume as partial cement replacement improved the fresh state properties of the concrete in the domain of the flow-ability. Higher partial replacement led to lesser compressive and flexural strength due to weak interfacial transition zone, the porosity of the mortar during adhesion to the fine and coarse aggregates. Rapid water absorption was observed after the first day of the concrete preparation which gradually tailed off with time.

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Effect of silica fume on durability of self-compacting concrete made with waste recycled concrete aggregates

Cited by 117 publications

References 50 publications

The Effect of Aggregate Shape on the Properties of Concretes with Silica Fume

The Effect of Aggregate Shape on the Properties of Concretes with Silica Fume

End-of-Life Materials Used as Supplementary Cementitious Materials in the Concrete Industry

Evaluation of fresh and hardened properties of blended silica fume self-compacting concrete (SCC)

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