Papers

@article{Seara-Paz2022,

title = {Deformation recovery of reinforced concrete beams made with recycled coarse aggregates},

author = {Sindy Seara-Paz and Belén González-Fonteboa and Fernando Martínez-Abella and Javier Eiras-López},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85118871013&doi=10.1016%2fj.engstruct.2021.113482&partnerID=40&md5=221a54bbbde46059a94466c544542535},

doi = {10.1016/j.engstruct.2021.113482},

issn = {01410296},

year  = {2022},

date = {2022-01-01},

urldate = {2022-01-01},

journal = {Engineering Structures},

volume = {251},

publisher = {Elsevier Ltd},

abstract = {The purpose of this research is to analyse the long-term deformations of reinforced concrete beams made of recycled coarse aggregates (RCA), using four different replacement ratios, 0%, 20%, 50% and 100%. For said purpose, three different loading stages were carried out: firstly, loading and sustained load for 1300 days, secondly, unloading and recovery where the deformations were registered over a one year period, and lastly, testing the concrete beams up to failure in order to analyse the effect of recycled aggregates on pre-cracked concrete members. The results led to the analysis of deformations under sustained load, as well as those produced after removing the load and the performance of pre-cracked members, while identifying the effect of recycled coarse aggregates on concrete performance in terms of plastic deformation, recoverability and concrete stiffness, and also on structural design. © 2021 The Authors},

note = {cited By 6},

keywords = {aggregate; deformation; loading; reinforced concrete; stiffness; structural component, Concrete aggregates, Concrete beams and girders; Cracks; Recycling; Reinforced concrete; Stiffness; Structural design; Unloading, Concrete stiffness; Cracked analysis; Deformation recovery; Flexural performance; Long-term deflection recovery; Long-term deflections; Recoverability; Recycled aggregate concrete; Recycled coarse aggregate; Reinforced concrete beams},

pubstate = {published},

tppubtype = {article}

}

@article{Seara-Paz2018593,

title = {Long-term flexural performance of reinforced concrete beams with recycled coarse aggregates},

author = {Sindy Seara-Paz and Belén González-Fonteboa and Fernando Martínez-Abella and Diego Carro-López},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85047087715&doi=10.1016%2fj.conbuildmat.2018.05.069&partnerID=40&md5=bad657562380dbbc313f3f87460c0502},

doi = {10.1016/j.conbuildmat.2018.05.069},

issn = {09500618},

year  = {2018},

date = {2018-01-01},

urldate = {2018-01-01},

journal = {Construction and Building Materials},

volume = {176},

pages = {593-607},

publisher = {Elsevier Ltd},

abstract = {The aim of this study is to investigate the behaviour of recycled aggregate concrete subjected to sustained loading. For the tests, eight reinforced concrete beams were manufactured with recycled coarse aggregate, using water-to-cement ratios of 0.50 and 0.65, and four replacement percentages: 0%, 20%, 50%, and 100%. First, the basic concrete properties, mechanical strength and modulus of elasticity, were determined after 28 d, and at the ageing load. The beam specimens were then loaded at 42 d, using a four-point bending test. Bending moments and deformations were obtained during the loading process, when cracking and serviceability conditions were reached, as well as the long-term deformations of recycled concrete beams up to 1000 d. Based on these results, it can be reported that long-term deformations are greater for recycled aggregate concrete than for conventional concrete, regarding both strain and deflection. Furthermore, a direct relationship was found between these deformations and the replacement percentage used. Lastly, code-based expressions were used to calculate the long-term deflections of RC beams subjected to sustained loading, which included the recycled coarse aggregate content and corrections previously proposed to predict the mechanical properties, creep, and shrinkage of recycled aggregate concrete. © 2018 Elsevier Ltd},

note = {cited By 42},

keywords = {Aggregates; Concrete beams and girders; Creep; Recycling; Reinforced concrete, Concrete aggregates, Flexural performance; Long-term deflections; Recycled aggregate concrete; Recycled coarse aggregate; Reinforced concrete beams; Serviceability conditions; Sustained loads; Water to cement (binder) ratios},

pubstate = {published},

tppubtype = {article}

}

@article{Seara-Paz201832,

title = {Flexural performance of reinforced concrete beams made with recycled concrete coarse aggregate},

author = {Sindy Seara-Paz and Belén González-Fonteboa and Fernando Martínez-Abella and Javier Eiras-López},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85034022704&doi=10.1016%2fj.engstruct.2017.11.015&partnerID=40&md5=4ebb8ab46cfb200f8a4ca07ff5ac479d},

doi = {10.1016/j.engstruct.2017.11.015},

issn = {01410296},

year  = {2018},

date = {2018-01-01},

urldate = {2018-01-01},

journal = {Engineering Structures},

volume = {156},

pages = {32-45},

publisher = {Elsevier Ltd},

abstract = {This work deals with the flexural performance of recycled concrete subjected to increasing loads up to failure. For this purpose, eight reinforced concrete beams were made with recycled coarse aggregates using two different water to cement ratios (0.50 and 0.65) and four replacement percentages (0%, 20%, 50% and 100%). Firstly, the basic concrete properties were determined (mechanical strengths and modulus of elasticity) and then, beam specimens were loaded up to failure using a four-point bending test at 28 days. As a result, bending moments, deflections, strains and curvatures were obtained at different load levels (cracking, service, yielding and ultimate state conditions), and also, the crack pattern. On the basis of these results, it can be noted that service, yielding and ultimate state of recycled concrete exhibits, in general, a similar trend to that of conventional concrete. However, the cracking behaviour shows differences between recycled and conventional concrete. Finally, code-based expressions were used to calculate bending moments and deflections under flexural load, taking into account the different content of recycled coarse aggregate. © 2017 Elsevier Ltd},

note = {cited By 75},

keywords = {aggregate; bending; cracking (fracture); curvature; deflection; flexure; performance assessment; reinforced concrete; strain; structural component, Aggregates; Bending moments; Concrete beams and girders; Concretes; Crack initiation; Cracks; Deflection (structures); Recycling; Reinforced concrete, Concrete aggregates, Flexural performance; Four-point bending test; Recycled coarse aggregate; Recycled concrete coarse aggregate; Recycled concretes; Reinforced concrete beams; Serviceability; Water to cement (binder) ratios},

pubstate = {published},

tppubtype = {article}

}

@article{Martínez-García2017570,

title = {Performance of mussel shell as aggregate in plain concrete},

author = {Carolina Martínez-García and Belén González-Fonteboa and Fernando Martínez-Abella and Diego Carro-López},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85002061878&doi=10.1016%2fj.conbuildmat.2016.09.091&partnerID=40&md5=0703e7f7f68b08e6bd314e51fa4477d5},

doi = {10.1016/j.conbuildmat.2016.09.091},

issn = {09500618},

year  = {2017},

date = {2017-01-01},

urldate = {2017-01-01},

journal = {Construction and Building Materials},

volume = {139},

pages = {570-583},

publisher = {Elsevier Ltd},

abstract = {In this work the performance of mussel shell as aggregate in plain concrete has been studied. The mussel shell used came from the cannery industry, which produces more than 1 million tonnes of shell by-product a year worldwide. The mussel shell has been heat-treated at 135 °C for 30 min and then crushed and sieved into sand and gravel. The new aggregates have been studied by X-ray diffraction (XRD), TGA and SEM microscopy. Then two different conventional concretes were designed, a non-structural concrete (NSC) and a plain structural concrete (SC). In both of them the natural aggregates (sand, gravel, and both sand and gravel) were replaced with mussel shell aggregates at different percentages. All concretes were characterized in fresh and hardened states (microstructure, workable life progression, workability, compressive and splitting strength, longitudinal modulus of elasticity, weight loss and water permeability). The results lead to establishing that with this treatment, mussel shell replacement should be limited to 25% of fine or coarse aggregates, or 12.5% of both fine and coarse aggregates. With these percentages the NSC and the SC will display a correct behaviour. © 2016 Elsevier Ltd},

note = {cited By 124},

keywords = {Aggregates; Concrete beams and girders; Concretes; Gravel; Lead removal (water treatment); Mechanical permeability; Mechanical properties; Mining laws and regulations; Molluscs; Shells (structures); X ray diffraction, Coarse aggregates; Conventional concrete; Natural aggregate; Non-structural concretes; Shell by-products; Splitting strength; Structural concretes; Water permeability, Concrete aggregates},

pubstate = {published},

tppubtype = {article}

}

@article{Seara-Paz201695,

title = {Time-dependent behaviour of structural concrete made with recycled coarse aggregates. Creep and shrinkage},

author = {Sindy Seara-Paz and Belén González-Fonteboa and Fernando Martínez-Abella and Iris González-Taboada},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84976321025&doi=10.1016%2fj.conbuildmat.2016.06.050&partnerID=40&md5=a95c0f5a561f5cc2b94a9db2304197f9},

doi = {10.1016/j.conbuildmat.2016.06.050},

issn = {09500618},

year  = {2016},

date = {2016-01-01},

urldate = {2016-01-01},

journal = {Construction and Building Materials},

volume = {122},

pages = {95-109},

publisher = {Elsevier Ltd},

abstract = {This work is focused on studying the time-dependent properties of recycled concrete, especially shrinkage and creep behaviour. For said purpose, two series of concretes (water to cement ratios of 0.50 and 0.65) were designed with different replacement percentages of recycled coarse aggregate (0%, 20%, 50% and 100%). The experimental program consisted of studying basic properties and time-dependent shrinkage and creep up to 1000 days. The results showed that shrinkage and creep strains increase with the replacement percentage, and the use of pre-saturated recycled aggregates leads to different time-dependent development of shrinkage and creep strains at early ages due to the internal curing effect. Finally, a function to predict recycled concrete shrinkage and creep coefficients was adjusted according to the content of recycled aggregates and concrete age. © 2016 Elsevier Ltd},

note = {cited By 94},

keywords = {Aggregates; Concrete beams and girders; Concretes; Creep; Curing; Recycling; Shrinkage, Concrete aggregates, Creep coefficient; Internal curing; Recycled coarse aggregate; Recycled concretes; Structural concretes; Time-dependent behaviour; Time-dependent properties; Water to cement (binder) ratios},

pubstate = {published},

tppubtype = {article}

}

@article{González-Fonteboa20093406,

title = {Structural shear behaviour of recycled concrete with silica fume},

author = {Belén González-Fonteboa and Fernando Martínez-Abella and Isabel Martínez-Lage and Javier Eiras-López},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-68549122513&doi=10.1016%2fj.conbuildmat.2009.06.035&partnerID=40&md5=3425e5c92b5d3c58449e199d462f3ec6},

doi = {10.1016/j.conbuildmat.2009.06.035},

issn = {09500618},

year  = {2009},

date = {2009-01-01},

urldate = {2009-01-01},

journal = {Construction and Building Materials},

volume = {23},

number = {11},

pages = {3406-3410},

abstract = {This paper is the outcome of the second stage of studies carried out on the structural behaviour of recycled concrete. The first stage determined, using beams specimens, the shear behaviour of recycled concrete with which 50% of the coarse aggregate was replaced by recycled coarse aggregate (obtained from concrete demolition waste). This stage revealed minor differences (recycled concrete - conventional concrete) in ultimate loads and these differences were found to increase when cracking was taken into account. In this study, it was determined that the addition of 8% silica fume to recycled concrete (recycled concrete with silica fume) improved this behaviour. Moreover, the use of this material in recycled concrete produced changes in its structural behaviour similar to those induced in conventional concrete (conventional concrete with silica fume). Finally, experimental results were compared using current codes and it had been seen that all of them were conservative so t can be used for the shear design of recycled concrete beams with silica fume. © 2009 Elsevier Ltd. All rights reserved.},

note = {cited By 54},

keywords = {Coarse aggregates; Conventional concrete; Current codes; Demolition wastes; Recycled aggregates; Recycled coarse aggregate; Recycled concrete; Recycled concrete beam; Recycled concretes; Shear behaviour; Shear design; Structural behaviour; Ultimate loads, Concrete aggregates, Concrete products; Demolition; Oxides; Recycling; Safety factor; Silica; Silica fume},

pubstate = {published},

tppubtype = {article}

}

@article{González-Fonteboa2008429,

title = {Concretes with aggregates from demolition waste and silica fume. Materials and mechanical properties},

author = {Belén González-Fonteboa and Fernando Martínez-Abella},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-36549023911&doi=10.1016%2fj.buildenv.2007.01.008&partnerID=40&md5=7add142ef3e9a3a277f4ecc1a98a74ca},

doi = {10.1016/j.buildenv.2007.01.008},

issn = {03601323},

year  = {2008},

date = {2008-01-01},

urldate = {2008-01-01},

journal = {Building and Environment},

volume = {43},

number = {4},

pages = {429-437},

abstract = {The purpose of this paper is to provide new data related to the field of recycled concrete in Spain. In keeping with this, several procedures were established, on the basis of which conclusions have been drawn regarding the suitability or non-suitability of recycled aggregates in Spain. Standard tests were carried out to determine the density, water absorption, grading, shape index, flakiness index and fragmentation resistance. Subsequently, proportion parameters were defined for average performance fresh and hard concrete made with these aggregates. These parameters were used to produce conventional concrete (CC) and conventional concrete with silica fume (CCS). The mixes were then adjusted for the production of recycled concrete (RC) and recycled concrete with silica fume (RCS) both containing 50% recycled coarse aggregates. Tests were conducted to determine the properties-both physical (density and water absorption) and mechanical (compressive and tensile splitting strength and static modulus of elasticity). © 2007 Elsevier Ltd. All rights reserved.},

note = {cited By 218},

keywords = {aggregate; concrete; demolition; mechanical property; silica; sustainable development, Compressive strength; Concrete aggregates; Density (specific gravity); Elastic moduli; Recycling; Silica fume; Tensile strength; Water absorption, Compressive strength; Density (specific gravity); Elastic moduli; Recycling; Silica fume; Tensile strength; Water absorption, Concrete aggregates, Eurasia; Europe; Southern Europe; Spain, Flakiness index; Fragmentation resistance; Recycled aggregates; Tensile splitting strength},

pubstate = {published},

tppubtype = {article}

}

@article{González-Fonteboa200553,

title = {Recycled aggregates concrete: Aggregate and mix properties},

author = {Belén González-Fonteboa and Fernando Martínez-Abella},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-24944494420&doi=10.3989%2fmc.2005.v55.i279.198&partnerID=40&md5=1dd10ac776af0babcbeb286775d2c49b},

doi = {10.3989/mc.2005.v55.i279.198},

issn = {04652746},

year  = {2005},

date = {2005-01-01},

urldate = {2005-01-01},

journal = {Materiales de Construccion},

volume = {55},

number = {279},

pages = {53-66},

publisher = {Inst. de Ciencias de la Construccion Eduardo Torroja},

abstract = {This study of structural concrete made with recycled concrete aggregate focuses on two issues: 1. The characterization of such aggregate on the Spanish market. This involved conducting standard tests to determine density, water absorption, grading, shape, flakiness and hardness. The results obtained show that, despite the considerable differences with respect to density and water absorption between these and natural aggregates, on the whole recycled aggregate is apt for use in concrete production. 2. Testing to determine the values of basic concrete properties: mix design parameters were established for structural concrete in non-aggressive environments. These parameters were used to produce conventional concrete, and then adjusted to manufacture recycled concrete aggregate (RCA) concrete, in which 50% of the coarse aggregate was replaced by the recycled material. Tests were conducted to determine the physical (density of the fresh and hardened material, water absorption) and mechanical (compressive strength, splitting tensile strength and modulus of elasticity) properties. The results showed that, from the standpoint of its physical and mechanical properties, concrete in which RCA accounted for 50% of the coarse aggregate compared favourably to conventional concrete.},

note = {cited By 32},

keywords = {Aggregates; Compressive strength; Concrete mixtures; Concrete products; Elastic moduli; Grading; Recycling; Tensile strength; Water absorption, Aggressive environment; Concrete productions; Conventional concrete; Physical and mechanical properties; Recycled aggregates; Recycled concrete aggregates; Recycled concretes; Splitting tensile strength, Concrete aggregates},

pubstate = {published},

tppubtype = {article}

}