Identification of frost-susceptible recycled concrete aggregates for durability of concrete

Gökçe, Ahmet; Nagataki, Shigeyoshi; Saeki, Tatsuhiko; Hisada, Makoto

doi:10.1016/j.conbuildmat.2010.11.054

Cited by 87 publications

(25 citation statements)

References 5 publications

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“…While these components could be inert in mineral carbonation, there are reports in the literature indicating that during several mechanical stages in the concrete recycling process, the amount of mortar attached to the coarse aggregates is reduced. In this case, the cement paste would accumulate in the fine fraction of the concrete (De Juan and Gutiérrez, 2009;Gokce et al, 2011;Silva et al, 2014).…”

Section: Methodsologymentioning

confidence: 99%

Valorization of waste concrete through CO2 mineral carbonation: Optimizing parameters and improving reactivity using concrete separation

Ghacham

Pasquier

Cecchi

et al. 2017

Journal of Cleaner Production

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The use of CO 2 mineral carbonation represents an attractive approach to recycling waste concrete. In this study, the effect of gas pressure, Liquid/Solid (L/S) ratio (w/w), Gas/Liquid (G/L) ratio (v/v) and reaction time for CO 2 sequestration were investigated. While carbonation of such matrix is already described, this study opens new insights in concrete carbonation. To increase the reactivity potential of concrete, the fine fraction (<500 μm), which contains mostly cement paste, was separated from the inert coarse aggregates. Separation was conducted by crushing and sieving. The ground fine concrete fraction showed enhanced reactivity with 75% of CO 2 removed (corresponding to 0.057 g CO 2 removed/sample) compared to that of raw concrete, with 54% of CO 2 removed (corresponding to 0.034 g CO 2 removed/sample). Tests were conducted under 144 psi of gas pressure (9.93 Bars) at ambient temperature for 10 min. On the other hand, the resulting aggregates fraction have an improved potential recycling value. The new proposed approach allows better carbonation efficiency and increases the overall valuation of waste concrete. © 2017. AbbreviationsCO 2 c CO 2 converted CO 2 r CO 2 removed (sum of CO 2 dissolved and CO 2 converted)

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Section: Methodsologymentioning

confidence: 99%

Valorization of waste concrete through CO2 mineral carbonation: Optimizing parameters and improving reactivity using concrete separation

Ghacham

Pasquier

Cecchi

et al. 2017

Journal of Cleaner Production

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“…Expansion of pore water after freezing increases the void spaces within the specimen which results in a looser soil structure and causes a decrease in the resilient modulus. RCA has a significant amount of cement adhered to the particle surfaces (Gokce, Nagataki, Saeki, & Hisada, 2011;Juan & Gutierrez, 2009;Saeed et al, 2006). The amount of cement paste attached to the particle surfaces depends on the process used to produce RCA and the properties of the original concrete (Chini, Kuo, Armaghani, & Duxbury, 2001).…”

Section: Rcamentioning

confidence: 97%

Climatic effect on resilient modulus of recycled unbound aggregates

Soleimanbeigi

Shedivy

Tinjum

et al. 2015

Road Materials and Pavement Design

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The effect of temperature on plastic strain and resilient modulus (M R ) of different sources of recycled asphalt pavement (RAP) and recycled concrete aggregate (RCA) was evaluated from the results of laboratory temperature-controlled M R tests, with a conventional Class 5 aggregate serving as the control. Freeze-thaw tests were also conducted on samples of RAP and RCA. Five years (spring-summer-fall-winter) of field falling weight deflectometer (FWD) tests were conducted on three pavement sections with RAP, RCA, and Class 5 as the unbound base course. Laboratory test results showed that temperature rise increased plastic strain and reduced M R of RAP under cyclic loads but had a negligible effect on plastic strain and M R of RCA. Freeze-thaw cycles steadily reduced the M R of RAP; however, long-term freeze-thaw cycles increased the M R of RCA. Thermal preloading reduced the plastic strain and increased the M R of the compacted RAP. Construction of a pavement system made with RAP is thus recommended during warm seasons to induce thermal preloading. The elastic modulus backcalculated from the FWD tests did not show a consistent trend with respect to temperature change. No significant change on elastic modulus of RAP, RCA, and Class 5 aggregates due to freeze-thaw cycles was observed over five years.

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“…The overall quality of recycled concrete aggregates is generally lower than that of natural aggregate, due to the mortar that remains attached to the natural aggregate [4]. Studies on the use of recycled concrete aggregates in concrete show that the compressive strength [3,4], drying shrinkage [3], creep [5], shear resistance [5], freeze and thaw resistance [6,7], abrasion resistance [4], sulphate content [4] etc. can be improved, if the attached mortar can be separated better from the recycled aggregates.…”

Section: Introductionmentioning

confidence: 99%

Fines extracted from recycled concrete as alternative raw material for Portland cement clinker production

Schoon

Buysser

Driessche

et al. 2015

Cement and Concrete Composites

139

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Identification of frost-susceptible recycled concrete aggregates for durability of concrete

Cited by 87 publications

References 5 publications

Valorization of waste concrete through CO2 mineral carbonation: Optimizing parameters and improving reactivity using concrete separation

Valorization of waste concrete through CO2 mineral carbonation: Optimizing parameters and improving reactivity using concrete separation

Climatic effect on resilient modulus of recycled unbound aggregates

Fines extracted from recycled concrete as alternative raw material for Portland cement clinker production

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