Recycled aggregate concretes – A state-of-the-art from the microstructure to the structural performance

Le, Hoai-Bao; Bui, Quoc-Bao

doi:10.1016/j.conbuildmat.2020.119522

Cited by 102 publications

(62 citation statements)

References 132 publications

(136 reference statements)

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“…Several previous studies suggested limiting the substitution of natural sand by recycled fine aggregate; the maximum substitution ratio of 30% is currently proposed, due to the durability concerns of recycled aggregate concretes [ 7 ]. In the present study, only coarse aggregate was substituted by recycled coarse aggregate.…”

Section: Methodsmentioning

confidence: 99%

“…In recent decades, important amounts of construction and demolition (C&D) wastes have been produced due to urbanization. The wastes from demolished concretes cause environmental issues when disposed in landfill sites [ 6 ]; however, these demolished concrete wastes can be recycled to be used as construction materials [ 7 ]. The recycling of C&D wastes has positive effects on the environmental and the economic aspects, so numerous investigations have been carried out on this topic [ 6 , 7 , 8 , 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…The old concrete is crushed, sieved, and cleaned to become recycled concrete aggregates. These recycled aggregates can be used as substitutes (partially or completely) of natural aggregates (coarse or/and fine) [ 7 ]. The recycled aggregates usually contain natural aggregates bonded with old cement mortars.…”

Section: Introductionmentioning

confidence: 99%

“…In RAC, there are two types of interfacial transition zones (ITZ): between the old mortar and the parent natural aggregates, and between the recycled aggregates and the new mortar. The ITZ between the old mortar and the new mortar contributes also to the decrease in mechanical characteristics of RAC; the improvement of this type of ITZ is an interesting topic to be explored [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

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Geopolymer Recycled Aggregate Concrete: From Experiments to Empirical Models

Bui

Tang

2021

Materials

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Ordinary cement concrete is a popular material with numerous advantages when compared to other construction materials; however, ordinary concrete is also criticized from the public point of view due to the CO2 emission (during the cement manufacture) and the consumption of natural resources (for the aggregates). In the context of sustainable development and circular economy, the recycling of materials and the use of alternative binders which have less environmental impacts than cement are challenges for the construction sector. This paper presents a study on non-conventional concrete using recycled aggregates and alkali-activated binder. The specimens were prepared from low calcium fly ash (FA, an industrial by-product), sodium silicate solution, sodium hydroxide solution, fine aggregate from river sand, and recycled coarse aggregate. First, influences of different factors were investigated: the ratio between alkaline activated solution (AAS) and FA, and the curing temperature and the lignosulfonate superplasticizer. The interfacial transition zone of geopolymer recycled aggregate concrete (GRAC) was evaluated by microscopic analyses. Then, two empirical models, which are the modified versions of Feret’s and De Larrard’s models, respectively, for cement concretes, were investigated for the prediction of GRAC compressive strength; the parameters of these models were identified. The results showed the positive behaviour of GRAC investigated and the relevancy of the models proposed.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geopolymer Recycled Aggregate Concrete: From Experiments to Empirical Models

Bui

Tang

2021

Materials

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“…Introducing recycled concrete aggregate (RCA) to the construction industry is an effort to preserve natural resources and to achieve sustainability [ 1 , 2 , 3 , 4 , 5 , 6 ]. However, concerns about variability of recycled aggregate (RA) properties have limited the use of RCA in structural applications.…”

Section: Introductionmentioning

confidence: 99%

Shear Strength of Fiber Reinforced Recycled Aggregate Concrete

Ghoneim

Yehia

et al. 2020

Materials

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In this paper, shear strength of fiber reinforced recycled concrete was investigated. A Self Consolidated Concrete (SCC) matrix with 100% coarse recycled aggregate and different types of fibers were used in the study. Steel (3D and 5D), synthetic and hybrid fibers with a volume fraction of 0.75% were added to the concrete matrix to prepare eight beams. In addition, two beams were cast without fibers as control specimens. All beams were prepared without shear reinforcement and were tested to evaluate concrete contribution to the shear capacity. In addition, optical images were captured to allow for full-field displacement measurements using Digital Image Correlation (DIC). The results showed about 23.44–64.48% improvement in the average concrete shear capacity for fiber-reinforced beams when compared to that of the control specimens. The percentage improvement was affected by fiber type and the steel fiber beams achieved the best performance. The addition of the fiber delayed the crack initiation and improved the post-cracking and ductile behavior of all beams. Moreover, the experimental results were compared to those predicted by codes and proposed equations found in the literature for concrete strength with and without fibers.

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Materials for Making Concrete

2022

Advanced Concrete Technology

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Recycled aggregate concretes – A state-of-the-art from the microstructure to the structural performance

Cited by 102 publications

References 132 publications

Geopolymer Recycled Aggregate Concrete: From Experiments to Empirical Models

Geopolymer Recycled Aggregate Concrete: From Experiments to Empirical Models

Shear Strength of Fiber Reinforced Recycled Aggregate Concrete

Materials for Making Concrete

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