Fracture behaviour of steel fibre reinforced recycled aggregate concrete after exposure to elevated temperatures

Chen, G.M.; Yang, Haitian; Lin, Chaohui; Chen, J.F.; He, Yuding; Zhang, H.Z.

doi:10.1016/j.conbuildmat.2016.10.072

Cited by 65 publications

(32 citation statements)

References 36 publications

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“…Der Einfluss von Stahlfasern auf die Arbeitslinien von Beton unter Druck und Zug bei hohen Temperaturen ist Gegenstand aktueller Forschung und daher nicht in allgemeinen Bemessungsvorschriften enthalten. Versuche von [22] an Stahlfaserbeton mit rezyklierten Zuschlägen und Fasermengen von bis zu 1,5 Vol.‐ % zeigen, dass sich die Zugabe von Stahlfasern im untersuchten Temperaturbereich von bis zu 600 °C positiv auf die temperaturabhängige Druckfestigkeit, den Elastizitätsmodul und das Energie‐Absorptionsvermögen im Vergleich zu Beton ohne Fasern auswirken. Nach [23] wird durch die Zugabe von Stahlfasern die Zugfestigkeit von Beton erhöht, sodass thermisch bedingte Abplatzungen reduziert werden.…”

Section: Analyse Der Brandversucheunclassified

Cytochrome P450 as Dimerization Catalyst in Diketopiperazine Alkaloid Biosynthesis

et al. 2014

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As dimeric natural products frequently exhibit useful biological activities, identifying and understanding their mechanisms of dimerization is of great interest. One such compound is (−)-ditryptophenaline, isolated from Aspergillus flavus, which inhibits substance P receptor for potential analgesic and anti-inflammatory activity. Through targeted gene knockout in A. flavus and heterologous yeast gene expression, we determined for the first time the gene cluster and pathway for the biosynthesis of a dimeric diketopiperazine alkaloid. We also determined that a single cytochrome P450, DtpC, is responsible not only for pyrroloindole ring formation but also for concurrent dimerization of N-methylphenylalanyltryptophanyl diketopiperazine monomers into a homodimeric product. Furthermore, DtpC exhibits relaxed substrate specificity, allowing the formation of two new dimeric compounds from a non-native monomeric precursor, brevianamide F. A radical-mediated mechanism of dimerization is proposed.

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Section: Analyse Der Brandversucheunclassified

Cytochrome P450 as Dimerization Catalyst in Diketopiperazine Alkaloid Biosynthesis

et al. 2014

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“…In this context, it was intended to investigate the new composite performance and to develop possibly materials with improved properties by the combination of fiber‐reinforced concrete with SCC and GPP. Concrete can be caused explosive spalling and strength deterioration which depends mainly on the degree of temperature, exposure duration, rate of cooling, the type and size of the structural element and the fire resistant characteristics when exposed to high temperature . Two main factors attribute the strength deterioration of concrete at elevated temperature: (a) vapor pressure created by the evaporation of free water in concrete; and (b) cracking of the concrete resulting from thermal stresses depending on the temperature gradient of the concrete .…”

Section: Introductionmentioning

confidence: 99%

“…Concrete can be caused explosive spalling and strength deterioration which depends mainly on the degree of temperature, exposure duration, rate of cooling, the type and size of the structural element and the fire resistant characteristics when exposed to high temperature . Two main factors attribute the strength deterioration of concrete at elevated temperature: (a) vapor pressure created by the evaporation of free water in concrete; and (b) cracking of the concrete resulting from thermal stresses depending on the temperature gradient of the concrete . Normal concretes generally do not lose their strength significantly at exposure temperatures below 300°C and loss of strength can be recovered by rehydration, but significant unrecoverable strength losses occurs when the temperature rises above 300°C .…”

Section: Introductionmentioning

confidence: 99%

“…Two main factors attribute the strength deterioration of concrete at elevated temperature: (a) vapor pressure created by the evaporation of free water in concrete; and (b) cracking of the concrete resulting from thermal stresses depending on the temperature gradient of the concrete . Normal concretes generally do not lose their strength significantly at exposure temperatures below 300°C and loss of strength can be recovered by rehydration, but significant unrecoverable strength losses occurs when the temperature rises above 300°C . Sarıdemir et al made an investigation on the mechanical properties of steel fiber reinforced high strength concrete (SFRHSC) with the replacement ratios of 5,10,15, and 20% ground pumice (GP) at the curing ages of 7, 28, and 56 days.…”

Section: Introductionmentioning

confidence: 99%

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High temperature effect on the mechanical behavior of steel fiber reinforced self‐compacting concrete containing ground pumice powder

Karataş

Dener

Benli

et al. 2019

Structural Concrete

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This study reports the results of high temperature effects on the properties of steel fiber reinforced self-compacting concrete (SFRSCC) fabricated by replacing cement with ground pumice powder (GPP) as mineral additive at different substitution rates. The mixtures had the same amounts of steel fiber and the binding material with constant water to binder (w/b) ratio of 0.37. In this context, five SFRSCC series were prepared by replacing Portland cement (PC) with 5, 10, 15, and 20% of GPP including the control mix. Sixty cube samples with a dimension of 150 × 150 × 150 mm were fabricated and exposed to curing aged 3, 7, 28, and 90 days to conduct compressive strength tests and a total of 100 × 100 × 350 mm 18 beam samples cured at 28 days were fabricated to perform the flexural strength tests. Durability tests were performed on the 18 cube samples of 100 × 100 × 100 mm subjected to water curing at 28 days. In addition, the relation between the compressive strength and Ultrasonic Pulse Velocity (UPV) of SFRSCC samples was compared aged 1, 3, 14, and 28 days. Samples of SFRSCC were subjected to the temperatures of 200, 400, 600, and 800 C after being cured at 28 days then cooled to room temperature before conducting tests. The results revealed that the compressive strength of all SFRSCC mixes enhanced at 200 C by 5.34 and 3.55% for control and GPP10 mixes respectively. The strength loss of mixes incorporating GPP is about 60% at 800 C. K E Y W O R D Scompressive strength, elevated temperature, ground pumice powder, steel fiber reinforced selfcompacting concrete, UPV

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“…While the elevated temperature behavior of fiber reinforced concretes is reported in a number of studies, the effect of various elevated temperatures on the properties of fiber reinforced recycled aggregate concretes attracted little attention. The only reported study is by Chen et al where compressive and cracking behavior of steel fiber reinforced recycled aggregate concrete at various elevated temperatures up to 600 °C is presented. The results show that after exposure to 200 °C, the recycled aggregate concrete with and without steel fibers showed about 15% reduction in compressive strength followed by about 59 and 31% reduction at 400 and 600 °C, respectively.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of concrete containing recycled coarse aggregate at and after exposure to elevated temperatures

Shaikh

2017

Structural Concrete

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This paper presents the effect of recycled coarse aggregate (RCA) of 50% and 100% by wt. on compressive strength and elastic modulus of concrete at elevated temperatures of 600 and 800 °C. The residual compressive strengths of above recycled aggregate concretes after exposure to elevated temperatures are also evaluated and compared to those measured during heating. The effect of polypropylene (PP) fibers on residual compressive strength and cracking behavior of above recycled aggregate concretes after exposure to elevated temperatures is also evaluated in this study. Results show that the loss of compressive strength of recycled aggregate concretes at 600 and 800 °C is slightly higher (about 10%) than its counterpart control concrete containing natural coarse aggregates. Concrete containing 100% RCA exhibited about 50% loss of its ambient temperature compressive strength at 800 °C, which is about 25% less in concrete containing 50% RCA. The residual compressive strength, which is measured after cooling of heated specimens, of both recycled aggregate concretes and control concrete is higher at both elevated temperatures. The measured elastic modulus of both recycled aggregate concretes show no significant reduction compared to their counterpart control concrete at both elevated temperatures. A strong correlation between elastic modulus and square root of compressive strength of recycled aggregate concretes is observed at elevated temperatures. The model proposed in Eurocode to predict the elevated temperature compressive strength and elastic modulus agrees well with the measured values for recycled aggregate concretes. The addition of PP fibers reduced the residual compressive strength of concrete containing 100% RCA at both temperatures with significant reduction at 800 °C. However, mixed results are obtained in the case of concrete containing 50% RCA. The cracking patterns of concrete containing RCA and those containing PP fibers also correlated well with the observed residual compressive strength results.

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Fracture behaviour of steel fibre reinforced recycled aggregate concrete after exposure to elevated temperatures

Cited by 65 publications

References 36 publications

Cytochrome P450 as Dimerization Catalyst in Diketopiperazine Alkaloid Biosynthesis

Cytochrome P450 as Dimerization Catalyst in Diketopiperazine Alkaloid Biosynthesis

High temperature effect on the mechanical behavior of steel fiber reinforced self‐compacting concrete containing ground pumice powder

Mechanical properties of concrete containing recycled coarse aggregate at and after exposure to elevated temperatures

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