Effect of elevated temperatures on the mechanical behavior of basalt textile reinforced refractory concrete

Rambo, Dimas Alan Strauss; Silva, Flávio de Andrade; Filho, Romildo Dias Toledo; Gomes, Otávio da Fonseca Martins

doi:10.1016/j.matdes.2014.08.060

Cited by 114 publications

(60 citation statements)

References 11 publications

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“…However, until 150°C, the evaporation of free and structural water of the AH x gel also takes place. For temperatures between 200°C and 300°C, the remaining hydrates AH 3 and C 3 AH 6 are almost completely dehydrated, but they can still be observed in the results at 400°C obtained by XRD [27]. We can say that C 12 A 7 is the rst observable dehydration product, which is formed from amorphous dehydrated CA at the temperature 400°C.…”

Section: Calcium-aluminous Cement (Cac)mentioning

confidence: 79%

“…e impact of high temperature starts with dehydration of metastable hydration products CAH 10 (CaO·Al 2 O 3 ·10H 2 O) and C 3 AH 8 (3CaO·Al 2 O 3 ·8H 2 O). According to XRD performed by [27], these hydration products (CAH 10 and C 3 AH 8 ) were not detected after exposure to 200°C. However, until 150°C, the evaporation of free and structural water of the AH x gel also takes place.…”

Section: Calcium-aluminous Cement (Cac)mentioning

confidence: 98%

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Development of Composite for Thermal Barriers Reinforced by Ceramic Fibers

Holčapek

Koťátková

Reiterman

2018

Advances in Civil Engineering

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e paper introduces the development process of fiber-reinforced composite with increased resistance to elevated temperatures, which could be additionally increased by the hydrothermal curing. However, production of these composites is extremely energy intensive, and that is why the process of the design reflects environmental aspects by incorporation of waste material-fine ceramic powder applied as cement replacement. Studied composite materials consisted of the basalt aggregate, ceramic fibers applied up to 8% by volume, calcium-aluminous cement (CAC), ceramic powder up to 25% by mass (by 5%) as cement replacement, plasticizer, and water. All studied mixtures were subjected to thermal loading on three thermal levels: 105°C, 600°C, and 1000°C. Experimental assessment was performed in terms of both initial and residual material properties; flow test of fresh mixtures, bulk density, compressive strength, flexural strength, fracture energy, and dynamic modulus of elasticity were investigated to find out an optimal dosage of ceramic fibers. Resulting set of composites containing 4% of ceramic fibers with various modifications by ceramic powder was cured under specific hydrothermal condition and again subjected to elevated temperatures. One of the most valuable benefits of additional hydrothermal curing of the composites lies in the higher residual mechanical properties, what allows successful utilization of cured composite as a thermal barrier in civil engineering. Mixtures containing ceramic powder as cement substitute exhibited after hydrothermal curing increase of residual flexural strength about 35%; on the other hand, pure mixture exhibited increase up to 10% even higher absolute values.

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Section: Calcium-aluminous Cement (Cac)mentioning

confidence: 79%

Section: Calcium-aluminous Cement (Cac)mentioning

confidence: 98%

Development of Composite for Thermal Barriers Reinforced by Ceramic Fibers

Holčapek

Koťátková

Reiterman

2018

Advances in Civil Engineering

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“…The threshold temperature for the composite based on ordinary Portland cement is 400°C, when the portlandite -Ca(OH) 2 decomposes to water and lime. The influence of elevated temperatures on the composite on the basis of CAC starts by a dehydration of CAH 10 and C 2 AH 8 [19]. The C 12 A 7 is the first observable dehydration product.…”

Section: Calcium Aluminous Cement (Cac)mentioning

confidence: 99%

Applicability of Carbon Fibres in Refractory Cement Composites

2018

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The main objective of this article is to present the influence of high temperatures on mechanical properties of advanced refractory cement composite reinforced with carbon fibres. The presented material is suitable for industrial applications and can withstand elevated temperatures up to 1000 °C. The action of high temperatures was investigated on two temperature levels 600 °C and 1000 °C and was compared to reference specimens dried at 105 °C. The carbon fibres with flexural strength of 4100MPa were applied in dosage 0.50 %, 0.75% and 1.00% of the total volume. The second investigated modification was mutual ratio between aluminous cement and fine ceramic powder. The influence of high temperatures was investigated by measuring the bulk density, compressive and flexural strength, dynamic modulus of elasticity and fracture energy; all measured on prismatic specimens 40 × 40 × 160 mm. The workability of fresh mixture was limited by the maximum dosage of carbon fibres in 1% of the total volume. Based on the workability and evaluation of residual mechanical properties after temperature loading, the best was found to be the combination of carbon fibres in dosage of 0.75% by volume.

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“…In studies [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28], the structural capacity of TRC alone (not on a different substrate) under elevated or high temperature has been investigated. However, in [12][13][14][15][16][17][18][19][20][21], the maximum temperature that was tested was 650 • C, and only in publications [22][23][24][25][26][27][28], TRC was investigated under temperatures of 700 • C-1000 • C, which corresponds to the realistic temperatures developed in case of a cellulosic fire [29]. Moreover, out of the last group of publications, only in [26,28] tests have been performed on TRC specimens according to the standard fire curve proposed by EN1363 ( [29]), while using glass or carbon fiber reinforcement, which are the most commonly used in structural applications.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical Behavior of Textile Reinforced Cementitious Composites Subjected to Fire

et al. 2019

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The mechanical behavior of textile reinforced cementitious composites (TRC) has been a topic of wide investigation during the past 30 years. However, most of the investigation is focused on the behavior under ambient temperatures, while only a few studies about the behavior under high temperatures have been conducted thus far. This paper focused on the thermomechanical behavior of TRC after exposure to fire and the residual capacity was examined. The parameters that were considered were the fiber material, the thickness of the concrete cover, the moisture content and the temperature of exposure. The specimens were exposed to fire only from one side and the residual strength was measured by means of flexural capacity. The results showed that the critical factor that affects the residual strength was the coating of the textiles and the law of the coating mass loss with respect to temperature. The effect of the other parameters was not quantified. The degradation of the compressive strength of TRC was quantified with respect to temperature. It was also concluded that a highly asymmetrical design scheme might lead to premature failure.

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Effect of elevated temperatures on the mechanical behavior of basalt textile reinforced refractory concrete

Cited by 114 publications

References 11 publications

Development of Composite for Thermal Barriers Reinforced by Ceramic Fibers

Development of Composite for Thermal Barriers Reinforced by Ceramic Fibers

Applicability of Carbon Fibres in Refractory Cement Composites

Thermomechanical Behavior of Textile Reinforced Cementitious Composites Subjected to Fire

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