Effect of carbonated recycled coarse aggregates on the mechanical and durability properties of concrete

Russo, Nicoletta; Lollini, Federica

doi:10.1016/j.jobe.2022.104290

Cited by 29 publications

(18 citation statements)

References 28 publications

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“…Table 8 shows the results, which demonstrate the advantage of carbonation, not only for granules, but also for increasing the composite's strength when granules are in it. These results reflect the fact that when CO 2 reacts with calcium hydroxide, calcium carbonate is formed, which increases hardness and decreases porosity [46]. Table 9 shows information about the 3D printed concrete compositions.…”

Section: Three-dimensional Printing Compositionsmentioning

confidence: 66%

Influence of Carbonated Bottom Slag Granules in 3D Concrete Printing

et al. 2023

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This study investigates the possibility of utilising bottom slag (BS) waste from landfills, and a carbonation process advantageous for the use of artificial aggregates (AAs) in printed three-dimensional (3D) concrete composites. In general, the main idea of granulated aggregates is to reduce the amount of CO2 emissions of printed 3D concrete objects (wall). AAs are made from construction materials, both granulated and carbonated. Granules are made from a combination of binder (ordinary Portland cement (OPC), hydrated lime, burnt shale ash (BSA)) and waste material (BS). BS is a waste material left over after the municipal waste burning process in cogeneration power plants. Whole printed 3D concrete composite manufacturing consists of: granulating artificial aggregate, aggregate hardening and sieving (adaptive granulometer), carbonation of AA, mixing 3D concrete, and 3D printing. The granulating and printing processes were analysed for hardening processes, strength results, workability parameters, and physical and mechanical properties. Printings with no granules (reference 3D printed concrete) were compared to 3D printed concretes with 25% and 50% of their natural aggregate replaced with carbonated AA. The results showed that, theoretically, the carbonation process could help to react approximately 126 kg/m3 CO2 from 1 m3 of granules.

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Section: Three-dimensional Printing Compositionsmentioning

confidence: 66%

Influence of Carbonated Bottom Slag Granules in 3D Concrete Printing

et al. 2023

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“…As demonstrated in several studies, CO 2 curing treatment is seemingly effective in increasing RCA quality and improving the hardening properties of RC, especially its mechanical properties. Conversely, research on the durability properties of concrete obtained with carbonated RCA is still limited and does not adequately optimize the concrete mix design for effective environmental benefits (65).…”

Section: Relationship Between the Water Absorption Of Treated Rc Aggr...mentioning

confidence: 99%

Effect of enhancement treatments applied to recycled concrete aggregates on concrete durability: A review

et al. 2023

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Recycled concrete aggregates (RCAs) have been demonstrated as an alternative source to exhaustible natural aggregates. In this paper, we focus on the enhancement treatments for coarse and fine RCAs and the effect of these treatments on the durability of recycled concrete (RC) made from treated RCAs by the weakening and strengthening of the cement paste adhered to their surface. We conducted comparative analyses on the improvement of durability and mechanical properties. The results showed that the reduction of water absorption in RCAs increases the compressive strength of RC and that there is a strong linear trend of improvement in the carbonation depth, chloride ion penetration, and compressive strength of RC. For fine and coarse RCAs, the treatment mechanism and particle size are determinants in efficiently improving RC durability.

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“…Therefore, the different treatments in the RCA reduce the percentage of water absorption, minimizing the error associated with moisture adjustment and, in turn, improving mechanical and durability performance. The use of treatments from chemical, thermal and mechanical processes has been reported to improve the quality of RCA, which can be classified into two main groups: the first group focuses on weakening the residual bonded cement paste in RCA by heating/grinding [17][18][19], crushing with a jaw or ball mill [20][21][22], cleaning/scrubbing [23,24] or even soaking (acid) [25][26][27][28]; the second group focuses on strengthening the microstructure and surface of the RCA by using CO 2 curing [29][30][31][32][33][34], biodeposition [35][36][37], coating (silica fume, fly ash, blast furnace slang) [38][39][40][41][42] and soaking (acid solution) [43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Carbonation Behavior of Mortar Made from Treated Recycled Aggregates: Influence of Diammonium Phosphate

et al. 2023

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This research aims to improve the quality of recycled concrete fine aggregates (RFA) by using diammonium hydrogen phosphate (DAP). We aimed to understand the effect of DAP treatment on durability performance due to the carbonation action of mortars with the partial and total substitution of treated RFA. The results showed a maximum reduction in the RFA water absorption of up to 33% using a minimum DAP concentration due to a pore refinement as a consequence of the formation of calcium phosphates such as hydroxyapatite (HAP). The carbonation phenomenon did not have a significant effect on the durability of mortars with DAP-treated RFA, as we did not find a decrease in the compressive strength; the carbonation depth of the mortars with 100% treated RFA decreased up to 90% and 63% for a w/c of 0.45 and 0.50, in comparison with mortars with 0% treated RFA. An inversely proportional relationship was found between the accelerate carbonation and the compressive strength, showing that higher percentages of treated RFAs in the mortar promoted an increase in compressive strength and a decrease in the carbonation rate, which is behavior associated with a lower permeability of the cement matrix as one of the consequences of the microstructural densification by DAP treatment.

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Effect of carbonated recycled coarse aggregates on the mechanical and durability properties of concrete

Cited by 29 publications

References 28 publications

Influence of Carbonated Bottom Slag Granules in 3D Concrete Printing

Influence of Carbonated Bottom Slag Granules in 3D Concrete Printing

Effect of enhancement treatments applied to recycled concrete aggregates on concrete durability: A review

Carbonation Behavior of Mortar Made from Treated Recycled Aggregates: Influence of Diammonium Phosphate

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