Temporal flowability evolution of slag-based self-compacting concrete with recycled concrete aggregate

Revilla‐Cuesta, Víctor; Skaf, Marta; Santamarı́a, Anton; Hernández-Bagaces, Jorge J.; Ortega-López, Vanesa

doi:10.1016/j.jclepro.2021.126890

Cited by 47 publications

(12 citation statements)

References 44 publications

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“…None of the RCA fractions, including 100 % initial coarse RCA, hindered such high flowability levels, thanks to careful dosing of the SCC. This good fresh performance was also supported by the results of viscosity, passing ability, and segregation resistance reported elsewhere [50].…”

Section: Filling Abilitysupporting

confidence: 86%

“…The limestone powder reduced the spread of the SCC, due to the higher amount of particles between 0.25 mm and 0.50 mm in size that are dragged within the cement paste with greater difficulty when using this aggregate powder [25]. However, RCA powder caused the highest loss of slump flow, because of its very angular and irregular shape [50]. This trend was noted when comparing mixes with the same amount of fine RCA.…”

Section: Filling Abilitymentioning

confidence: 92%

“…The composition of the SCC was adjusted accordingly, to maintain this slump-flow class when the content or nature of any component was modified. It was therefore possible to show that the use of large amounts of RCA was no impediment to obtaining high levels of self-compactability [50].…”

Section: Designmentioning

confidence: 99%

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Hammer rebound index as an overall-mechanical-quality indicator of self-compacting concrete containing recycled concrete aggregate

Revilla‐Cuesta

Ortega-López

Faleschini

et al. 2022

Construction and Building Materials

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Section: Filling Abilitysupporting

confidence: 86%

Section: Filling Abilitymentioning

confidence: 92%

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Hammer rebound index as an overall-mechanical-quality indicator of self-compacting concrete containing recycled concrete aggregate

Revilla‐Cuesta

Ortega-López

Faleschini

et al. 2022

Construction and Building Materials

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“…Further replacement failed to fulfil the minimal compliance requirements of concrete. The presence of adhered mortar was the culprit that weakened the interfacial transition zone (ITZ) and became responsible for earlier failure of bonding between the packed aggregate regards TRCA-based SCC [80,81]. In addition, relative compressive strength revealed maximum differentiation, specifically in SET-2 at the age of 7 days as in Fig.…”

Section: Compressive Strength Of Sccmentioning

confidence: 99%

Implementation assessment of calcined and uncalcined cashew nut-shell ash with total recycled concrete aggregate in self-compacting concrete employing Bailey grading technique

Tantri

Nayak

Shenoy

et al. 2022

Innov. Infrastruct. Solut.

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The present study concentrates on the performance evaluation of calcined and uncalcined cashew nut-shell ash (UCCNA and CCNA) with treated total recycled concrete aggregate (TRCA) in self-compacting concrete. The achievement of sustainable self-compacting concrete (SCC) is possible by the implication of four stages, which includes TRCA treatment process, gradation selection process through Bailey aggregate grading technique, by considering TRCA replacement percentage with an increment of 25% and up to 100% and by considering UCCNA or CCNA replacement with an increment of 5% and up to 20%. Hardened and fresh properties of SCC have been performed and analyzed based on the compliance requirements of SCC. In addition finding results through microstructure assessment was in line with the findings of the hardened and fresh properties of SCC. In addition, quality and dynamic instability assessments of SCC were analyzed through ultrasonic pulse velocity and drying shrinkage aspects. Besides CO2, the emission rate and the efficiency rate of SCC, composites were analyzed in detail. Overall findings revealed that CCNA-based SCC mixes performed effectively than UCCNA-based SCC; specifically, incorporation of 75% of TRCA with 15% CCNA was found to be optimal. But with regard to shrinkage performance UCCNA found to be better by imputing less shrinkage compared to CCNA-based SCC mixes. Further with regard to efficiency rate of SCC composites revealed the gain of maximum efficiency of about 0.156 MPa/kg CO2/m3 and 0.160 MPa/kg CO2/m3 for 15% and 20% CCNA-based SCC mixes.

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“…Of greater concern is the role of the residual hardened cement paste present on the recycled aggregates and its tendency to absorb water over time. Indeed, it is generally reported that the initial workability of concrete mixes containing RCA is usually satisfactory [19,20,21], but tends to worsen rapidly thereafter [7]. Not too surprisingly, this loss of workability depends on the percentage of RCA in the concrete mix, thus laying the grounds for putting a cap on the amount of recycled aggregates in the norms.…”

Section: Rheological Properties Of Recycled Concretementioning

confidence: 99%

Challenges in material recycling for postwar reconstruction

et al. 2022

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Besides the fact that concrete recycling allows to avoid landfills disposal and contributes to a closed-cycle economy, such option may be very much in demand in war struck regions such as Ukraine, which after the end of the war, are faced with the problem of rebuilding and reconstructing. Beyond this emergency, even in peacetime extensive parts of the building stock will sooner or later need to be replaced and concrete recycling is called to play an increasing role there. However, depending on the technology and degree to which aggregates are recycled, concrete may be characterized by poor workability, reduced mechanical properties, increased shrinkage and reduced durability. This deterioration in the properties of recycled concrete is usually attributed to the characteristics of the old cement mortar remaining on the surface of the recycled aggregates, which is best considered as an additional volume of hardened cement paste with fine aggregate and additional porosity. This article attempts to underline how such key concepts help frame the current state of knowledge about concrete recycling, understand the implications of existing regulations, in order to define pragmatic and efficient routes for broadening the use of concrete recycling in war struck regions, with specific examples regarding Ukraine.

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Temporal flowability evolution of slag-based self-compacting concrete with recycled concrete aggregate

Cited by 47 publications

References 44 publications

Hammer rebound index as an overall-mechanical-quality indicator of self-compacting concrete containing recycled concrete aggregate

Hammer rebound index as an overall-mechanical-quality indicator of self-compacting concrete containing recycled concrete aggregate

Implementation assessment of calcined and uncalcined cashew nut-shell ash with total recycled concrete aggregate in self-compacting concrete employing Bailey grading technique

Challenges in material recycling for postwar reconstruction

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