Thermal deformability of recycled self-compacting concrete under cyclical temperature variations

Revilla‐Cuesta, Víctor; Skaf, Marta; Chica, J.A.; Fuente-Alonso, José A.; Ortega-López, Vanesa

doi:10.1016/j.matlet.2020.128417

Cited by 33 publications

(8 citation statements)

References 10 publications

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“…These properties, along with the thermal properties, are useful for defining the validity of an SCC to be used from a functional point of view. A first approach to this thermal behavior is shown in a previous study of the authors (Revilla-Cuesta et al, 2020b). In this study, the thermal deformability of the SCC made with RCA was evaluated under both positive and negative cyclical temperature variations.…”

Section: Results and Discussion: Hardened Behaviormentioning

confidence: 99%

“…4: The higher content of fine RCA particles smaller than 0.25 mm in comparison with siliceous sand, caused this by-product to increase the initial slump flow. It therefore compensated the other negative effects of fine RCA, such as its angular shaped particles (Revilla-Cuesta et al, 2020b). However, the high water absorption of the fines hindered the temporal evolution of the slump flow (Gonz alez-Taboada et al, 2017b), and the slump-flow percentages gradually decreased.…”

Section: Slump-flow Spreadingmentioning

confidence: 99%

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

Revilla‐Cuesta

Skaf

Santamarı́a

et al. 2021

Journal of Cleaner Production

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Section: Results and Discussion: Hardened Behaviormentioning

confidence: 99%

Section: Slump-flow Spreadingmentioning

confidence: 99%

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

Revilla‐Cuesta

Skaf

Santamarı́a

et al. 2021

Journal of Cleaner Production

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“…The total porosity of concrete greatly varies with the dry and saturated conditions of the RA [ 15 ]. The linear thermal expansion coefficient of concrete will increase due to the addition of recycled coarse aggregate [ 16 ]. Kwan et al found that RAC would expand during water curing, and the higher the RA content, the higher the expansion would be [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Mixed Recycled Aggregate on the Mechanical Strength and Microstructure of Concrete under Different Water Cement Ratios

et al. 2021

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Mixed recycled aggregate (MRA) is a kind of recycled aggregate containing discarded bricks and other impurities that is inferior to ordinary recycled concrete aggregate. To study the effect of MRA in concrete, specimens with 100% MRA under different water–cement ratios (W/C) of 0.50, 0.42, 0.36 and 0.30 were prepared, and the mechanical properties and microstructure were tested. Results show that compared with ordinary concrete, the compressive strength of mixed recycled aggregate concrete (MRAC) with the same W/C was reduced by more than 50% at 28 days, but the axial compression ratio was relatively high, reaching over 0.87. Affected by the high water absorption of MRA, the hydration rate of cement slowed, which was beneficial to the long-term development of the properties of MRAC. An appropriate increase in cement content could strengthen MRA and densify the pore structure of MRAC. The research results of this article prove that MRA has high utilization value and could be used to prepare MRAC with application potential using optimal gradation, which is of positive significance for promoting the consumption of construction waste.

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“…Table 16 shows the characteristic strength according to the normal distribution and the best-fit distribution (Weibull or gamma) for each mixture. In addition, this table also shows the normalized value according to the Spanish Instruction of Structural Concrete EHE-08 [29], calculated by approximating the value obtained to the standard series (20,25,30,35,40,45,50,55,60,70,80,90, and 100 MPa). Figure 10 shows the calculation of the 5% percentile for each mixture in the best-fit distribution (Weibull or gamma).…”

Section: Normal Distributionmentioning

confidence: 99%

Statistical Approach for the Design of Structural Self-Compacting Concrete with Fine Recycled Concrete Aggregate

et al. 2020

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The compressive strength of recycled concrete is acknowledged to be largely conditioned by the incorporation ratio of Recycled Concrete Aggregate (RCA), although that ratio needs to be carefully assessed to optimize the design of structural applications. In this study, Self-Compacting Concrete (SCC) mixes containing 100% coarse RCA and variable amounts, between 0% and 100%, of fine RCA were manufactured and their compressive strengths were tested in the laboratory for a statistical analysis of their strength variations, which exhibited robustness and normality according to the common statistical procedures. The results of the confidence intervals, the one-factor ANalysis Of VAriance (ANOVA), and the Kruskal–Wallis test showed that an increase in fine RCA content did not necessarily result in a significant decrease in strength, although the addition of fine RCA delayed the development of the final strength. The statistical models presented in this research can be used to define the optimum incorporation ratio that would produce the highest compressive strength. Furthermore, the multiple regression models offered accurate estimations of compressive strength, considering the interaction between the incorporation ratio of fine RCA and the curing age of concrete that the two-factor ANOVA revealed. Lastly, the probability distribution predictions, obtained through a log-likelihood analysis, fitted the results better than the predictions based on current standards, which clearly underestimated the compressive strength of SCC manufactured with fine RCA and require adjustment to take full advantage of these recycled materials. This analysis could be carried out on any type of waste and concrete, which would allow one to evaluate the same aspects as in this research and ensure that the use of recycled concrete maximizes both sustainability and strength.

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Thermal deformability of recycled self-compacting concrete under cyclical temperature variations

Cited by 33 publications

References 10 publications

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

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

Effect of Mixed Recycled Aggregate on the Mechanical Strength and Microstructure of Concrete under Different Water Cement Ratios

Statistical Approach for the Design of Structural Self-Compacting Concrete with Fine Recycled Concrete Aggregate

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