2021
DOI: 10.1002/suco.202100407
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Removing attached mortar from recycled aggregate by the combined freeze–thaw cycles and high‐temperature drying

Abstract: The fundamental reason for the poor performance of recycled aggregate (RA) and recycled aggregate concrete (RAC) is the attached mortar, which severely restricts the application of RA and RAC. This research proposes an innovative method for the modification of RA: using the freeze–thaw cycle (FTC) to remove the attached mortar. In addition, to improve the spalling efficiency, high temperature drying is introduced before and during FTCs. The results show that as the lowest temperature of FTC decreases, the spal… Show more

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Cited by 9 publications
(2 citation statements)
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“…• The coarse fraction is composed of particles >4 mm that consist of NA and adhered mortar. 16,17 Compared to coarse NA, the presence of adhered mortar in coarse RA lowers its density, raises its water absorption levels, and lessens its adherence within the new cementitious concrete matrix when used as an aggregate. 18,19 All these aspects decrease concrete workability, strength, and elastic stiffness.…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…• The coarse fraction is composed of particles >4 mm that consist of NA and adhered mortar. 16,17 Compared to coarse NA, the presence of adhered mortar in coarse RA lowers its density, raises its water absorption levels, and lessens its adherence within the new cementitious concrete matrix when used as an aggregate. 18,19 All these aspects decrease concrete workability, strength, and elastic stiffness.…”
Section: Introductionmentioning
confidence: 99%
“…RA is probably the most widely studied sustainable aggregate in the literature 12,13 . Although all RA is sourced from the crushing of unused concrete components, 14,15 a distinction is usually drawn between the behavior of the coarse and the fine fractions: The coarse fraction is composed of particles >4 mm that consist of NA and adhered mortar 16,17 . Compared to coarse NA, the presence of adhered mortar in coarse RA lowers its density, raises its water absorption levels, and lessens its adherence within the new cementitious concrete matrix when used as an aggregate 18,19 .…”
Section: Introductionmentioning
confidence: 99%