Effect of nylon fibres on mechanical and thermal properties of hardened concrete for energy storage systems

Ozger, O.; Girardi, Fabrizio; Giannuzzi, Giuseppe; Salomoni, Valentina; Majorana, C. E.; Fambri, Luca; Baldassino, Nadia; Maggio, R. Di

doi:10.1016/j.matdes.2013.04.085

Cited by 83 publications

(49 citation statements)

References 34 publications

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“…Ozger et al [46] prepared and tested a plain concrete (PC), composed of natural aggregates such as gravel, limestone sand from crushed dolomite, with a type II cement (CEM II/A-L 42.5N, [47]) as binder, and a FC, prepared with the same aggregates of PC, added with 0.5% v/v of recycled synthetic fiber. Characterization of thermal properties was carried out at 623 K.…”

Section: Storage Materials Selected From Literature Review On Sensiblmentioning

confidence: 99%

“…A linear rule of mixture based on available A4 mix proportion has been used for the estimation. The stability of above reported properties has been assessed by characterization tests performed at different temperatures [9,12,46]. Further, the selection of these specific storage materials has been driven by the fact that their thermal properties at high temperatures are reported.…”

Section: Storage Materials Selected From Literature Review On Sensiblmentioning

confidence: 99%

“…Finally, thermal behavior of experimental geopolymer concrete has been preliminarily evaluated according to the following procedure: cubic geopolymer concrete specimens (5 cm edge) were submitted to thermal treatments starting from room temperature (298 K), cubic specimens were directly exposed to high temperature in a thermostatic oven for 30 min, then cooled down to 298 K and again placed directly in oven for another interval of 30 min. At first the test was carried out at 423 K, to evaluate possible spalling phenomena [46]. A second test was then performed at 723 K, that represents the actual limit for thermal storage in solid media [6].…”

Section: Lightweight Concretes and Geopolymeric Concrete Tested For Smentioning

confidence: 99%

See 2 more Smart Citations

Finite Element Method Modeling of Sensible Heat Thermal Energy Storage with Innovative Concretes and Comparative Analysis with Literature Benchmarks

et al. 2014

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Efficient systems for high performance buildings are required to improve the integration of renewable energy sources and to reduce primary energy consumption from fossil fuels. This paper is focused on sensible heat thermal energy storage (SHTES) systems using solid media and numerical simulation of their transient behavior using the finite element method (FEM). Unlike other papers in the literature, the numerical model and simulation approach has simultaneously taken into consideration various aspects: thermal properties at high temperature, the actual geometry of the repeated storage element and the actual storage cycle adopted. High-performance thermal storage materials from the literatures have been tested and used here as reference benchmarks. Other materials tested are lightweight concretes with recycled aggregates and a geopolymer concrete. Their thermal properties have been measured and used as inputs in the numerical model to preliminarily evaluate their application in thermal storage. The analysis carried out can also be used to optimize the storage system, in terms of thermal properties required to the storage material. OPEN ACCESSEnergies 2014, 7 5292The results showed a significant influence of the thermal properties on the performances of the storage elements. Simulation results have provided information for further scale-up from a single differential storage element to the entire module as a function of material thermal properties.

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Section: Storage Materials Selected From Literature Review On Sensiblmentioning

confidence: 99%

Section: Storage Materials Selected From Literature Review On Sensiblmentioning

confidence: 99%

Section: Lightweight Concretes and Geopolymeric Concrete Tested For Smentioning

confidence: 99%

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Finite Element Method Modeling of Sensible Heat Thermal Energy Storage with Innovative Concretes and Comparative Analysis with Literature Benchmarks

et al. 2014

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“…A wide variety of discontinuous fibrous materials including steel [2]- [4], glass [5]- [7], nylon [8]- [10], polypropylene [11]- [15], and carbon [16]- [21] have been used as reinforcement to improve many resilience-related factors such as the resistance to crack development, arrest of crack propagation, strength, toughness, absorption of impact energy, durability in wear, ductility, and dimensional stability. A previous study [22] on the ceramic fiber-reinforced geothermal well cement composites demonstrated that the ideal fibers were required to meet the following material criteria: 1) good dispersion and mixing workability to achieve a uniform distribution in the cement slurry; 2) a thermal-and hydrothermal-resistance of ≥300˚C; 3) a minimum susceptibility to reactions with brine containing alkali-and alkaline earth-metals; and, 4) a moderate adherence to the cement matrix.…”

Section: Introductionmentioning

confidence: 99%

Toughness Improvement of Geothermal Well Cement at up to 300<sup>&deg;</sup>C: Using Carbon Microfiber

Sugama¹,

Pyatina²

2014

OJCM

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This study aimed at assessing the usefulness of carbon microfiber (CMF) in improving the compressive-toughness of sodium metasilicate-activated calcium aluminate/Class F fly ash foamed cement at hydrothermal temperatures of up to 300˚C. When the CMFs came in contact with a pore solution of cement, their surfaces underwent alkali-caused oxidation, leading to the formation of metal (Na, Ca, Al)-complexed carboxylate groups. The extent of this oxidation was enhanced by the temperature increase, corresponding to the incorporation of more oxidation derivatives at higher temperatures. Although micro-probe examinations did not show any defects in the fibers, the enhanced oxidation engendered shrinkage of the interlayer spacing between the C-basal planes in CMFs, and a decline in their thermal stability. On the other hand, the complexed carboxylate groups present on the surfaces of oxidized fibers played a pivotal role in improving the adherence of fibers to the cement matrix. Such fiber/cement interfacial bonds contributed significantly to the excellent bridging effect of fibers, resistance to the cracks development and propagation, and to improvement of the post-crack material ductility. Consequently, the compressive toughness of the 85˚-, 200˚-, and 300˚C-autoclaved foamed cements reinforced with 10 wt% CMF was 2.4-, 2.9-, and 3.1-fold higher than for cement without the reinforcement.

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“…Fiber reinforced concrete is a new class of strong, tough and highly durable material (Banthia and Gupta, 2006;Sivakumar and Santhanam, 2007;Nanni et al, 1993;Li et al, 2004;Ozger et al, 2013). Fiber in the cement based matrix acts as a crack arrester which restricts the growth of flow in the matrix, preventing these from widening under load in to cracks which cause failure (Atis et al, 2013;Song et al, 2005;Sekar, 2004;Karahan and Atis, 2011;Ramadoss and Nagamani, 2008).…”

Section: Introductionmentioning

confidence: 99%

Studies on the Performance of Self Healing of Plastic Cracks Using Natural Fibers in Concrete

Saraswathy¹,

Kwon²,

Karthick³

2014

Journal of the Korean Recycled Construction Resources Institute

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Addition of fibers in cement or cement concrete may be of current interest, but this is not a new idea or concept. Fibers of any material and shape play an important role in improving the strength and deformation characteristics of the cement matrix in which they are incorporated. The new concept and technology reveal that the engineering advantages of adding fibers in concrete may improve the fracture toughness, fatigue resistance, impact resistance, flexural strength, compressive strength, thermal crack resistance, rebound loss, and so on. The magnitude of the improvement depends upon both the amount and the type of fibers used. In this paper, locally available waste fibers such as coir fibers, sisal fibers and polypropylene fibers have incorporated in concrete with varying percentages and l/d ratio and their effect on compressive, split, flexural, bond and impact resistance have been reported.

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Effect of nylon fibres on mechanical and thermal properties of hardened concrete for energy storage systems

Cited by 83 publications

References 34 publications

Finite Element Method Modeling of Sensible Heat Thermal Energy Storage with Innovative Concretes and Comparative Analysis with Literature Benchmarks

Finite Element Method Modeling of Sensible Heat Thermal Energy Storage with Innovative Concretes and Comparative Analysis with Literature Benchmarks

Toughness Improvement of Geothermal Well Cement at up to 300<sup>&deg;</sup>C: Using Carbon Microfiber

Studies on the Performance of Self Healing of Plastic Cracks Using Natural Fibers in Concrete

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Effect of nylon fibres on mechanical and thermal properties of hardened concrete for energy storage systems

Cited by 83 publications

References 34 publications

Finite Element Method Modeling of Sensible Heat Thermal Energy Storage with Innovative Concretes and Comparative Analysis with Literature Benchmarks

Finite Element Method Modeling of Sensible Heat Thermal Energy Storage with Innovative Concretes and Comparative Analysis with Literature Benchmarks

Toughness Improvement of Geothermal Well Cement at up to 300&lt;sup&gt;&amp;deg;&lt;/sup&gt;C: Using Carbon Microfiber

Studies on the Performance of Self Healing of Plastic Cracks Using Natural Fibers in Concrete

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Toughness Improvement of Geothermal Well Cement at up to 300<sup>°</sup>C: Using Carbon Microfiber