Pre- and post-fire behaviour of glass concrete from wet packing density perspective

Journal of Building Engineering, Год журнала: 2024, Номер 86, С. 108758 - 108758

Опубликована: Фев. 6, 2024

Recycled glass can be ground into different particle sizes to partially replace cement or aggregates, which is important for developing sustainable concrete production. In this study, a total of 16 mixes containing powder (GP), silica fume (SF) and sand (GS) were designed investigate the fresh harden material properties at ambient temperature, heat transfer mechanism temperature development, mass loss, apparent change surface texture as well residual compressive strength elastic modulus after exposure elevated temperatures (400–1000 °C). Results show that possesses larger slump flow suffers less loss are believed caused by improved wet packing density (WPD) existence more abundant excess water. Besides, replacing with GP up 15% and/or SF 10% would enhance 11.6% 4.7% respectively 4.5% 5.3% concrete. At temperatures, core was lower, indicating could provide an effective solution in improving concrete's heat-insulation capacity due enhanced WPD. After 400, 600, 800 1000 °C, incorporation enhancing maximum 15.2%, 38.3%, 9.1% 37.5% 7.5%, 17.3%, 19.4% 19.5%, WPD re-solidification GP/GS its molten state strengthened interface transition zone.

Язык: Английский

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A Review on the Carbonation of Steel Slag: Properties, Mechanism, and Application

Materials, Год журнала: 2024, Номер 17(9), С. 2066 - 2066

Опубликована: Апрель 28, 2024

Steel slag is a by-product of the steel industry and usually contains high amount f-CaO f-MgO, which will result in serious soundness problems once used as binding material and/or aggregates. To relieve this negative effect, carbonation treatment was believed to be one available reliable methods. By slag, phases f-MgO can effectively transformed into CaCO3 MgCO3, respectively. This not only reduce expansive risk improve utilization further but also capture store CO2 due mineralization process carbon emissions. In study, based on physical chemical properties mechanism, factors affecting process, application carbonated were reviewed. Eventually, research challenge discussed.

Язык: Английский

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Fillers to improve the ductility and impermeability of crumb rubber concrete

Construction and Building Materials, Год журнала: 2024, Номер 425, С. 136073 - 136073

Опубликована: Апрель 1, 2024

Язык: Английский

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Green engineered cementitious composites with enhanced tensile and flexural properties at elevated temperatures

Cleaner Materials, Год журнала: 2024, Номер 12, С. 100240 - 100240

Опубликована: Март 18, 2024

This study provides new insights in the design of green hybrid polyethylene (PE)-steel fibre reinforced high strength engineered cementitious composite (HSECC) with superior tensile and flexural at both ambient elevated temperatures. Blends volume ground granulated blast furnace slag (GGBFS), dolomite powder fly ash were utilized to achieve a 60 % cement replacement for HSECC mixes. These mixes then exposed 20–600 °C total 210 specimens tested assess their residual stress–strain behaviour, load–displacement response, toughness. Results indicate that GGBFS can be very effective limiting surface damage retaining A combination 1.5 PE-0.75 steel quaternary blend GGBFS, demonstrated least 40 retention 600 °C, respectively. was significantly better than traditional control silica fume mix considered this as well results reported many previous literatures on HSECC. Microstructural examination further conducted understand mechanism deterioration justify resulting change pseudo-hardening behaviour temperature rise. Findings obtained clearly effectiveness PE-steel hybridisation confirmed right binder selection, performance achieved even level.

Язык: Английский

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Iron sand heavy-weight concrete – pre- and post-fire characteristics from wet packing density perspective

Construction and Building Materials, Год журнала: 2024, Номер 435, С. 136728 - 136728

Опубликована: Май 28, 2024

Heavy-weight concrete (HWC) is currently the most widely used radiation shielding material in nuclear industry. However, pre- and post-fire mechanical behavior of HWC containing Iron sand (IS) and/or fly ash (FA) not thoroughly studied. This paper fills research gap by testing 12 mixes, which replaced river (RS) with 50% or 100% IS ordinary Portland cement (OPC) 15%, 25% 35% FA volume. The temperature-time curve, mass loss, surface change, onset spalling, failure modes, residual compressive strength, elastic modulus stress-strain curve after having exposed to 400, 600, 800 1000°C were investigated. Additionally, chemical compositions analyzed X-ray diffraction. Results demonstrated that flowability increased / replacement ratio due more spherical shape improved packing structure. Replacing RS 15% OPC could effectively enhance thermal insulation capacity, strength (increased 9.5% at 25°C 400°C, 12.9% 600°C, 46.0% 800°C 63.6% compared normal concrete) 26.3% 25°C, 17.5% 20.5% 120% HWC. Lastly, all obtained results suggested characteristic explicable/predictable theory wet density.

Язык: Английский

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Improving the passing ability of SSCA-IS ultra-heavy-weight concrete by optimizing its packing structure

Magazine of Concrete Research, Год журнала: 2024, Номер unknown, С. 1 - 13

Опубликована: Июнь 11, 2024

Heavy-weight concrete (HWC) is a widely adopted radiation shielding material in the nuclear industry. In this study, two kinds of high-density aggregate, namely, iron sand (IS) and steel slag coarse aggregate (SSCA), were to fully replace river natural respectively, producing ultra-heavy-weight (UHWC) with unit weight >3800 kg/m 3 , ensure excellent performance. However, IS SSCA seriously impaired passing ability UHWC as cement paste could not hold firmly aggregates, owing their high density. To overcome this, rheology should be optimised by partially replacing superfine silica fume (SSF) using suitable amount superplasticiser (SP) enhance wet packing density (WPD). A total 28 mixes different replacement ratios SSF SP dosages tested for segregation width, flowability, L-box ability, WPD. Results revealed that incorporating an appropriate quantity improved WPD UHWC, resulting resistance, enhanced increased higher weight. Lastly, there positive correlation between

Язык: Английский

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Experimental investigation on the flexural behavior of SFRC beams reinforced with hybrid reinforcement schemes

Engineering Structures, Год журнала: 2024, Номер 309, С. 118054 - 118054

Опубликована: Апрель 22, 2024

Язык: Английский

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Investigation of electromagnetic interference shielding performance of ultra-high-performance mortar incorporating single-walled carbon nanotubes and steel fiber

Journal of Building Engineering, Год журнала: 2024, Номер 89, С. 109286 - 109286

Опубликована: Апрель 11, 2024

Язык: Английский

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Packing coupled post-fire behavior of ultra-heavy-weight concrete

Construction and Building Materials, Год журнала: 2025, Номер 477, С. 141008 - 141008

Опубликована: Апрель 19, 2025

Язык: Английский

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Experimental and theoretical study of fire resistance of steel slag powder concrete beams

Engineering Structures, Год журнала: 2024, Номер 325, С. 119402 - 119402

Опубликована: Ноя. 29, 2024

Язык: Английский

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