Time-dependent behaviour of structural concrete made with recycled coarse aggregates. Creep and shrinkage

Seara-Paz, Sindy; González-Fonteboa, Belén; Martínez-Abella, Fernando; González-Taboada, Iris

doi:10.1016/j.conbuildmat.2016.06.050

Cited by 110 publications

(44 citation statements)

References 48 publications

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“…In general, RC's compressive strength is lower than that of conventional concrete, decreasing when the coarse aggregate incorporation ratio increases (2,(24)(25)(26)(27). However, the extent of this decrease mainly depends on the recycled aggregate's content, concrete production method (9) and recycled aggregates' type, size and origin (22).…”

Section: Compressive Strength (F C )mentioning

confidence: 97%

“…Regarding RC with low replacement ratios (20-30%), different researches revealed that its shrinkage presents values slightly higher than those obtained in conventional concrete (increments of 3-8%) (2,10,78). When replacement get up to 50%, the shrinkage deformations in RC are 13-33% higher than those registered in conventional concretes.…”

Section: Shrinkagementioning

confidence: 99%

“…Although most authors conclude that shrinkage increases up to 35-80% in concrete with 100% recycled aggregate (2,49,62,77,78), a few have stated that this concrete may show similar shrinkage deformations to that obtained in conventional concrete, even with replacement ratios of 100%, when using high-quality recycled aggregate or different mixing methods (10,69,79,80). Kou et al (10) analysed the effect of using recycled aggregates with different water absorption coefficients and composition.…”

Section: Shrinkagementioning

confidence: 99%

“…In this context, recycled concrete (RC) has been recognised as a means to preserve natural resources and reduce space for waste storage (2). However, the use of this concrete is not yet widespread despite the great number of studies involving RC's behaviour and the establishment of trustworthy design guidelines (2)(3)(4)(5)(6)(7)(8).…”

Section: Introduction and Objectivesmentioning

confidence: 99%

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Recycled concrete with coarse recycled aggregate. An overview and analysis

González-Fonteboa

Seara-Paz

Brito³

et al. 2018

Mater. construcc.

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ABSTRACT:The construction field has contributed to environmental degradation, producing a high amount of construction and demolition waste (C&D waste) and consuming large volumes of natural resources. In this context, recycled concrete (RC) has been recognised as a means to preserve natural resources and reduce space for waste storage. During the last decades, many researchers have developed works studying different recycled concrete properties.This review focuses on structural RC made with coarse recycled aggregate from concrete waste. The main objective is to provide a state of the art report on RC's properties and an analysis on how to predict them taking into account relevant research works. Moreover, the study tries to collect and update RC findings, proposing equations to define RC's performance, in terms of mechanical strength, modulus of elasticity, stress-strain, creep and shrinkage. RESUMEN:Hormigón reciclado con árido grueso reciclado. Una visión general y análisis. El campo de la construcción ha contribuido a la degradación del medio ambiente, produciendo gran cantidad de residuos de construcción y demolición y consumiendo grandes volúmenes de recursos naturales. En este contexto, el hormigón reciclado se ha presentado como una opción para preservar los recursos naturales y reducir el espacio destinado a vertedero. Así, durante las últimas décadas, muchos investigadores han desarrollado trabajos para estudiar las propiedades del hormigón reciclado.Este artículo se centra en el hormigón estructural fabricado con árido reciclado grueso procedente de residuos de hormigón. El principal objetivo es desarrollar un estado del arte que recoja las principales propiedades del hormigón reciclado y un análisis de cómo calcularlas teniendo en cuenta un gran número de trabajos relevantes en este ámbito. Adicionalmente, el estudio recopila y actualiza el conocimiento sobre estos hormigones, proponiendo ecuaciones que permitan definir sus resistencias mecánicas, módulo de elasticidad, tensión-deformación, fluencia y retracción.

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Section: Compressive Strength (F C )mentioning

confidence: 97%

Section: Shrinkagementioning

confidence: 99%

Section: Shrinkagementioning

confidence: 99%

Section: Introduction and Objectivesmentioning

confidence: 99%

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Recycled concrete with coarse recycled aggregate. An overview and analysis

González-Fonteboa

Seara-Paz

Brito³

et al. 2018

Mater. construcc.

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“…U posljednje vrijeme istraživanja u predloženom području vrlo su intenzivna. Tako se u literaturi [30] analizira vremenski ovisno ponašanje betona napravljenog od grubog agregata, dobivenog od recikliranog betonskog materijala, te je zaključeno kako se povećava efekt puzanja i skupljanja s povećanjem postotka recikliranoga grubog agregata u betonskoj mješavini. U literaturi [31] predstavljen je numerički model za proračun vremenski ovisnog ponašanja betona prednapetih aramidnim vlaknima koja su ojačana polimerom i/ili čeličnim užadima.…”

Section: Pregledni Prikaz Modela Vremenski Ovisnog Ponašanja Betonaunclassified

An overview of the models for time dependent behavior of concrete

Džolan¹

2017

Zajednički Temelji 2017 - Peti Skup Mladih Istraživača Iz Područja Građevinarstva I Srodnih Tehničkih Znanosti - Zbornik Radova

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SažetakBeton kao građevni materijal, u današnjem obliku, počeo se koristiti krajem 19. stoljeća. Međutim, tlačna čvrstoća betona znatno je veća od vlačne, te se beton armira kako bi armatura preuzela naprezanja u vlačnoj zoni betona. U vlačnoj zoni armiranog betona dolazi do otvaranja pukotina u betonu kada su vlačna naprezanja dostigla vrijednost vlačne čvrstoće betona. Kako bi se izbjegla pojava pukotina ili ograničila njihova širina, osmišljeno je prednapinanje betona. Prednapinjanjem se u beton unose tlačna naprezanja prije njegova opterećivanja, te se time omogućuje tlačna raspodjela naprezanja po visini opterećenog betonskog presjeka, čime se izbjegava pojava pukotina. Prvi pokušaji prednapinjanja su propadali zbog nepoznavanja fenomena puzanja i skupljanja betona. Naime, u betonu se uslijed puzanja i skupljanja pojavljuju naprezanja koja mogu dovesti do otvaranja pukotine prije opterećivanja betona. Puzanje i skupljanje predstavljaju vremenski ovisne deformacije, gdje puzanje, za razliku od skupljanja, ovisi i o opterećenju. Deformacije izazvane puzanjem i skupljanjem mogu biti i nekoliko puta veće od deformacija izazvanih djelovanjem kratkotrajnih statičkih opterećenja, tako da je besmisleno proučavati ponašanje konstrukcija zanemarujući efekte puzanja i skupljanja betona. Ključne riječi: puzanje, skupljanje, prednapinjanje, betonAn overview of the models for time dependent behavior of concrete Abstract Using of the concrete as building material in its present form began at the end of the 19th century. However, the compressive strength of the concrete is considerably higher than the tensile strength and the concrete is reinforced that the reinforcement takes the stresses in the tensile zone of concrete. In the tensile zone of reinforced concrete, concrete cracking occurs when tensile stresses have reached the value of tensile strength of concrete. In order to avoid cracking or limiting their width, the idea of pre-stressing concrete appears. By prestressing, compresive pressures are applied to the concrete before loading the concrete, thereby it is provided compresive pressure distribution at the height of the loaded concrete section, avoiding the occurrence of cracks. The first attempts prestressing haven't been succeed because it was unknown phenomenon of creep and shrinkage concrete. Namely, there are stresses in concrete that are caused with creep and shrinkage and that can cause cracking of concrete before loading of concrete. Creep and shrinkage represent time-dependent deformations, where creep, unlike shrinkage, also depends of the load. Deformations caused by creep and shrinkage may also be several times greater than deformations caused by the action of short-term static loads, so it is meaningless to study the behavior of the structures by neglecting the effects of creep and shrinkage of concrete.

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Applicability of models provided by technical standards to estimate the static modulus of elasticity of concretes produced with recycled coarse aggregates

Sousa

Kazmierczak

Quinino

et al. 2020

Structural Concrete

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This work determines the applicability of models provided by international standards to estimate the static modulus of elasticity of concretes produced with recycled coarse aggregates, identifying the influence of the compressive strength, bulk specific gravity and porosity on the static modulus of elasticity, and the relation between these parameters and the estimated modulus of elasticity. Recycled aggregates produced from concrete and of ceramic blocks were used in a replacement rate of 30% to the natural aggregates, in three classes of strength. The static modulus of elasticity of the concretes produced with recycled aggregates has a higher relationship to the compressive strength than the other properties, the static modulus of elasticity compared to the estimated modulus of elasticity shows good relation only for concretes produced entirely with natural aggregates and the modulus of elasticity of concretes with recycled coarse aggregates cannot be estimated by the models proposed by the technical standards.

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Time-dependent behaviour of structural concrete made with recycled coarse aggregates. Creep and shrinkage

Cited by 110 publications

References 48 publications

Recycled concrete with coarse recycled aggregate. An overview and analysis

Recycled concrete with coarse recycled aggregate. An overview and analysis

An overview of the models for time dependent behavior of concrete

Applicability of models provided by technical standards to estimate the static modulus of elasticity of concretes produced with recycled coarse aggregates

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