Influence of Cooling Methods on the Residual Mechanical Behavior of Fire-Exposed Concrete: An Experimental Study

Carvalho, Espedito Felipe Teixeira de; Neto, João Trajano da Silva; Soares, Paulo Roberto Ribeiro; Maciel, Priscila de Souza; Fransozo, Helder Luis; Bezerra, Augusto César da Silva; Gouveia, Antônio Maria Claret de

doi:10.3390/ma12213512

Cited by 12 publications

(3 citation statements)

References 45 publications

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“…Because the interfacial transition zone (ITZ) is the weakest connection between cement paste and aggregate, it can enhance crack propagation. As a result, increasing temperature raises internal stresses, which accelerates material cracking, multiplies defects, and thereby lowers strength [21,22].…”

Section: Compressive Strengthmentioning

confidence: 99%

Effect of elevated temperature on strength and durability properties of concrete using nano-silica and alccofine

Ashwini¹,

P²

2021

Res. Eng. Struct. Mater.

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The strength and durability properties of concrete using nano-silica and alccofine after exposed to higher temperatures were investigated in this study. Concrete with 3% nano-silica and 15% alccofine were prepared and water cured for 28 days. In an electric boogie furnace, concrete specimens with and without nano-silica and alccofine were heated to 400°C and 800°C for 4 hours. The specimens then were allowed to cool until they reached room temperature. The compressive strength test was used to determine strength, whereas the water absorption, porosity, and rapid chloride permeability tests were conducted to check durability properties. SEM images were used to examine the microstructure of concrete specimens at elevated temperatures. According to the test results, the strength and durability properties of concrete using nanosilica and alccofine deteriorated at high temperatures. At room temperature, concretes containing alccofine and nano silica performed better than control mixes. A severe loss in strength and a significant increase in charge pass, water absorption and porosity were observed at 800°C for concrete using alccofine and nano silica. The microstructural analysis using scanning electron microscopy methods also reported that the porosity increased with increase in temperature.

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Section: Compressive Strengthmentioning

confidence: 99%

Effect of elevated temperature on strength and durability properties of concrete using nano-silica and alccofine

Ashwini¹,

P²

2021

Res. Eng. Struct. Mater.

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“…In such scenarios, fires are typically promptly extinguished through the application of water. This can lead to adverse consequences, such as the deterioration of the mechanical properties of concrete and steel bars [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Repairing of One-Way Solid Slab Exposed to Thermal Shock Using CFRP: Experimental and Analytical Study

Shhabat,

Ashteyat,

Abdel-Jaber

2024

Fibers

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This research was conducted to investigate, experimentally, theoretically, and numerically, the use of CFRP materials for repairing a reinforced concrete one-way solid slab exposed to thermal shock. Nine slabs, measuring 1800 mm in length, 500 mm in width, and 100 mm in depth, were cast. Seven of these slabs underwent thermal shock at a temperature of 600 °C, rapidly cooled by immersion in water for 15 min. Three primary parameters were examined: the type of CFRP (rope, strip, and sheet), spacing (100 and 200 mm), and the number of sheet layers (one and two). The experimental results revealed a significant decrease of approximately 45.4% in the compressive strength of the concrete after exposure to thermal shock. The thermally shocked RC slab showed a reduction in ultimate capacity by 15.4% and 38.5% in stiffness compared to the control slab. The results underscored the efficacy of CFRP materials, with all repair configurations exhibiting a substantial increase in maximum load capacity and stiffness. Capacity enhancement ranged from 23.7% to 53.4%, while stiffness improvement ranged from 27.6% to 57.1%. Notably, all repair configurations effectively minimized the maximum deflection. This reduction in deflection ranged from 5.2% to 26% compared to the control slab. Numerical results demonstrated strong concurrence with experimental results for both capacity and deflection. The enhancement in capacity ranged from 0.7% to 10.4%, while deflection decreased within a range from 0.95% to 14.16% compared to experimental results.

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“…There is mature, dependable high-quality automation available on the in international market [13]. The techno-logical difficulties with which portable biogas plants were opposes two decades ago have been resolved [14]. Different methods of desulphurization have been successfully accepted and combustion motors liberal to biogas that have proven their performance available in the market.…”

Section: Introductionmentioning

confidence: 99%

Optimized Biomethanization Of Grinded Organic Waste Using Catalyst

Shyamala,

Arulmozhi,

Ramesh

et al. 2023

E3S Web Conf.

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Research work was conducted to investigate the production of biogas using mesophilic anaerobic digestions. The organic waste utilized for bio gas appeared to produce less bio gas in the initial state up to 5 days due to temperature changes, then the gas production gradually increases. From the experimental set up, it was discovered that biogas generation was not uniform. Cow dung, food waste and agriculture wastes were used as organic waste for loading the anaerobic digester. Catalyst such as lime, hydrogen peroxide and silica gel were added to enhance the reaction. From above investigation, it is conceivable that the COD reduced gradually in the digester. Biogas production were fluctuating throughout the study period. The ideal measure of gas production in the range of 320 mg/l was obtained by adding hydrogen peroxide but for a period of 30 days experiment cumulative bio gas production measure is 4697 mg/l, which is achieved by adding lime as catalyst. Efficient bio methanation of grinded organic waste can be achieved by adding lime in most economical way.

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Influence of Cooling Methods on the Residual Mechanical Behavior of Fire-Exposed Concrete: An Experimental Study

Cited by 12 publications

References 45 publications

Effect of elevated temperature on strength and durability properties of concrete using nano-silica and alccofine

Effect of elevated temperature on strength and durability properties of concrete using nano-silica and alccofine

Repairing of One-Way Solid Slab Exposed to Thermal Shock Using CFRP: Experimental and Analytical Study

Optimized Biomethanization Of Grinded Organic Waste Using Catalyst

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