Water absorption of fine recycled aggregates: effective determination by a method based on electrical conductivity

Sosa, María Eva; Carrizo, Leandro; Zega, Claudio Javier; Zaccardi, Yury Villagrán

doi:10.1617/s11527-018-1248-2

Cited by 24 publications

(15 citation statements)

References 27 publications

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“…3 that the water absorption of RFA presents a similar trend, but it was much higher than that of the RCA fractions 3/8 and 8/16 mm. Similar absorption values have been reported in the literature (Sosa et al 2018;Berredjem et al 2020).…”

Section: Aggregatessupporting

confidence: 91%

Unconventional tools for the study of the flow properties of concrete equivalent mortar based on recycled concrete aggregates

Amara

Arabi

Perrot

2021

Environ Sci Pollut Res

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The self-compacting concrete (SCC) mix design is much more complex than that of ordinary concrete. Increased testing on fresh concrete and a substantial volume of materials is consequently needed. The concrete equivalent mortar (CEM) method proposes an approach that simplifies and speeds up the experimental testing programmes. This paper seeks to establish the relationships between the rheological properties of SCC and the corresponding CEM mixes. Another aim is to validate the unconventional tools used to test the flow properties of CEM relative to the procedures applied for SCC. Different series of SCC and CEM mixes, based on natural and recycled aggregates, with various superplasticizer contents were tested. The flow behaviour of SCC was tested in line with procedures recommended by EFNARC; that of self-compacting concrete equivalent mortar (SC-CEM) was carried out with unconventional tools (mini-slump cone, slump flow time T 250 , mini L-Box, 2.5-mm sieve, and mini LCPC Box), described in detail in this paper. A rheometer equipped with vane geometry was also used to show the close relationship between SCC and the SC-CEM yield stress. The experimental results indicate that the fresh properties of the mixture series are congruent with the acceptance criteria of SCC, but they are affected when increasing the superplasticizer dosage and further impacted when recycled coarse aggregates (RCAs) replace natural coarse aggregates (NCAs). The slump flow test appears to be a good practical means for predicting the yield stress of SC-CEM. The cross-referencing results reveal significant relationships between SCC and the corresponding SC-CEM, particularly for filling ability and passing properties. Reasonable correlation coefficients from 0.70 to 0.85 were found.Keywords Recycled concrete aggregates • Concrete equivalent mortar • Self-compacting concrete • Fresh properties

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Section: Aggregatessupporting

confidence: 91%

Unconventional tools for the study of the flow properties of concrete equivalent mortar based on recycled concrete aggregates

Amara

Arabi

Perrot

2021

Environ Sci Pollut Res

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“…Examples of studies adopting fine RAs in cement composite products can be found in Sosa et al [62], Martínez-Aires et al [63], Kim et al [64], and Ho et al [65];…”

Section: 2keyword Analysismentioning

confidence: 99%

Adopting recycled aggregates as sustainable construction materials: A review of the scientific literature

Chen

Jin

et al. 2019

Construction and Building Materials

127

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Adopting a holistic three-step literature review workflow, a total of 1,639 journal articles were used in this study as the literature sample related to recycled aggregate (RA). This study summarized the existing research topics focusing on RA, gaps of current research, suggestions for promoting RA usage, and research directions for future work. A research framework was also proposed linking the existing research themes into trends in RA research. This review work serves as a foundation work to bridge the gap between scientific research and industry practice, as well as to guide the directions in RA-related academic work using an interdisciplinary approach.

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“…Similarly, the IFSTTAR method involves considerable subjectivity on the part of the operator and reports have shown that the WA in the fine fraction tends to be overestimated due to agglomeration of fine particles resulting from capillary forces [34,17]. Other six methods to determine WA have also been applied to FRCA with less diffusion [10,30,31,36,37,38,[40][41]. The wide variety of WA testing methods and the different WA values obtained with them do not contribute to a trustworthy evaluation of FRCA, and hence to a consensus on the real effects of FRCA on concrete properties.…”

Section: Test Methods For the Determination Of The Water Absorption O...mentioning

confidence: 99%

“…An additional problem is the determination of the water absorption (WA) of FRCA. This quantification can lead to significantly different values depending on the method used [9][10]. This variability is of key importance because any miscalculation of the water uptake of FRCA implies a change in the effective w/c ratio.…”

Section: Estimated Effective W/c = (Total Water Content − Aggregates ...mentioning

confidence: 99%

A critical review of the resulting effective water-to-cement ratio of fine recycled aggregate concrete

Sosa

Zaccardi

Zega

2021

Construction and Building Materials

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Water absorption of fine recycled aggregates: effective determination by a method based on electrical conductivity

Cited by 24 publications

References 27 publications

Unconventional tools for the study of the flow properties of concrete equivalent mortar based on recycled concrete aggregates

Unconventional tools for the study of the flow properties of concrete equivalent mortar based on recycled concrete aggregates

Adopting recycled aggregates as sustainable construction materials: A review of the scientific literature

A critical review of the resulting effective water-to-cement ratio of fine recycled aggregate concrete

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