Creep of recycled aggregate concrete: Experimental database and creep prediction model according to the fib Model Code 2010

Tošić, Nikola; Fuente, Albert de la; Marinković, Snežana

doi:10.1016/j.conbuildmat.2018.11.048

Cited by 40 publications

(44 citation statements)

References 18 publications

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“…At later ages, the specific creep function is between 15 and 20% higher for concretes with recycled gravel. Such increase of the creep function was already observed by many authors on hardened recycled concrete as indicated by Tošić et al (2019). While the substitution of 30% of natural sand by recycled one increases the specific creep function by 48 %.…”

Section: Compressive Basic Creepsupporting

confidence: 71%

Special Issue: Interdisciplinary approaches for cement-based materials and structural concrete

Azenha¹,

Schlicke²,

Benboudjema³

et al. 2019

ACT

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This special issue of the Journal of Advanced Concrete Technology presents seven invited journal papers, which were selected on basis of outstanding conference contributions during the International RILEM/COST conference SynerCrete'18, held on 24-26 October 2018 in Funchal, Madeira Island, Portugal, which gathered 183 participants. The selection was made by the scientific committee and the chairpersons among 184 contributions. The conference itself dealt with interdisciplinary approaches for cement-based materials and structural concrete, intending to provide added value through collaborations across the entire field of structural concrete-ranging from concrete technology, over simulation and structural design, production and building, up to operation, monitoring and maintenance. Exciting fields of research such as performance-based design, 3D modelling for analysis/design, Building Information Modelling and even robotics (e.g. digital fabrication or robotics design) were included, while retaining focus on multi-scale approaches at time and spatial levels. Overall, the hereby promoted journal papers are representative for the successful balance act between a great versatility of the conference contributions and the targeted synergizing of expertise aiming on the ultimate goal of reliable and durable concrete structures. SynerCrete'18 also marked the end of COST Action TU1404 "Towards the next generation of standards for service life of cement-based materials and structures" (www.tu1404.eu), offering a final forum to the discussions raised during the funded period of the Action from 2014 to 2018. A sense of accomplishment was felt by all the members of the Action, in the view of the important achievements of networking tools that were brought about by the extended Round Robin Testing Programme (RRT+), the Numerical Benchmarking Activities and 24 Short Term Scientific Missions (STSMs). Some of the selected papers in this special issue are the result of fruitful collaborations initiated by COST Action TU1404. A further remark in regard to the wide international institutional support that this conference attained, is about the direct support of RILEM, fib, JCI and ACI. Specifically, with regard to the Japanese Concrete Institute, a mention is given to the special session dedicated to the most recent version of "JCI Guidelines for Control of Cracking of Mass Concrete", as it was indeed one of the most inspiring documents that influenced the genesis of COST Action TU1404.

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Section: Compressive Basic Creepsupporting

confidence: 71%

Special Issue: Interdisciplinary approaches for cement-based materials and structural concrete

Azenha¹,

Schlicke²,

Benboudjema³

et al. 2019

ACT

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“…It was observed that an increase of the creep coefficient up to 80% can be reached for concrete made with 100% recycled aggregate [37]. However, main results coming from the literature report an increase of the creep between 15 and 60% [27,38]. For moderate replacement ratios (between 20-30%), an increase of 5-25% has been reported [27].…”

Section: Introductionmentioning

confidence: 99%

Impact of recycled sand and gravels in concrete on volume change

Delsaute

Staquet

2020

Construction and Building Materials

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The nature and the porosity of sand and gravel impact significantly the development of the free deformation at early age of cement based materials. For recycled concrete, the high porosity and the subsequent internal water curing provided by recycled sand and gravels cause a decrease of the autogenous shrinkage, limit the increase of the CTE during the first days after setting and globally increase the CTE (up to 50%). A new model was developed for the consideration of the internal curing effect on the development of the autogenous strain. It is observed that the autogenous strain development induced by the internal water curing effect of the recycled sand and gravels can be modelled by an exponential law according to the equivalent age and by a sinusoid law according to the hydration degree.

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“…For the modulus of elasticity, Silva et al provided a comprehensive literature review and suggested a predictive expression as an extension of Eurocode 2 . Tošić et al provided empirical equations for predicting the shrinkage strain and creep coefficient of RAC as an extension of MC2010.…”

Section: Introductionmentioning

confidence: 99%

Deflection control for reinforced recycled aggregate concrete beams: Experimental database and extension of the fib Model Code 2010 model

Tošić

Marinković

Brito

2019

Structural Concrete

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Recycled aggregate concrete (RAC) has emerged as a viable solution for solving some of the environmental problems of concrete production. However, design guidelines for deflection control of reinforced RAC members have not yet been proposed. This study presents a comprehensive analysis of the applicability of the fib Model Code 2010 (MC2010) deflection control model to reinforced RAC beams. Three databases of long‐term studies on natural aggregate concrete (NAC) and RAC beams were compiled and meta‐analyses of deflection predictions by MC2010 were performed. First, the MC2010 deflection control model was tested against a large database of long‐term tests on NAC beams. Second, a database of RAC and companion NAC beams was compiled and initial and long‐term deflections were calculated using the MC2010 model. It was shown that deflections of RAC beams are significantly underestimated relative to NAC beams. Previously proposed modifications for MC2010 equations for shrinkage strain and creep coefficient were used, and new modifications for the modulus of elasticity and empirical coefficient β were proposed. The improved MC2010 deflection control model on RAC beams was shown to have equal performance to that on companion NAC beams. The proposals presented in this paper can help engineers to more reliably perform deflection control of reinforced RAC members.

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Creep of recycled aggregate concrete: Experimental database and creep prediction model according to the fib Model Code 2010

Cited by 40 publications

References 18 publications

Special Issue: Interdisciplinary approaches for cement-based materials and structural concrete

Special Issue: Interdisciplinary approaches for cement-based materials and structural concrete

Impact of recycled sand and gravels in concrete on volume change

Deflection control for reinforced recycled aggregate concrete beams: Experimental database and extension of the fib Model Code 2010 model

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