Effects of pretreatment methods on the properties of recycled aggregates and prepared concrete under CO2-curing

Cai, Zhedong; Gao, Yueqing; Yin, Yangyang; Ma, Zhiming; Liang, Chaofeng

doi:10.1016/j.cscm.2023.e01826

Cited by 3 publications

(7 citation statements)

References 47 publications

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“…Pozzolanic cementitious slurries can coat RCA surfaces, resulting in decreases in RCA porosity [59]. As demonstrated in published studies [62,63,69], carbonation can reduce the porosity of RCA by 20-50% [23].…”

Section: Porositymentioning

confidence: 91%

“…According to previous studies [3,5,7,62], the porosity variation in RCA is mainly affected by the composition and the content of adhering mortar. The porosity of RCA can be indirectly determined by water absorption, mercury intrusion pores (MIP), and computed tomography.…”

Section: Porositymentioning

confidence: 94%

“…As presented in Figure 5c,d, CO2 can react with adhered mortar (i.e., some hydrates, such as CH and C-S-H) [60][61][62][63]. Typically, the carbonation of CH and C-S-H can increase the solid volume by ~10% and 20%, respectively [64][65][66].…”

Section: Accelerated Carbonationmentioning

confidence: 96%

“…Therefore, the calcium carbonate produced by carbonation can form a dense film around the CH [27,67,68]. The further dissolution of CH and the further diffusion of CO 2 are more difficult [61][62][63]69]. Thus, the CH's carbonation rate may be initially more rapid than that of the C-S-H [61,69,70].…”

Section: Accelerated Carbonationmentioning

confidence: 99%

“…If an excessively thin coating paste is used, the inferiority of the adhered mortar cannot be ameliorated [78]. Carbonation treatments can enhance RCA mortar, and the adhered mortar's average microhardness can be enhanced by about 15% [62]. Generally, longer carbonation times are beneficial for improving RCA's crushing value.…”

Section: Crushing Valuementioning

confidence: 99%

See 4 more Smart Citations

Performance Improvement of Recycled Concrete Aggregates and Their Potential Applications in Infrastructure: A Review

Han

Zhao²,

et al. 2023

Buildings

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In the construction industry, natural aggregates (NA) can be replaced by recycled concrete aggregates (RCA), which can address the issue of construction-waste disposal and resolve the dilemma between demand and supply. This paper aims to systematically review the modification of RCA techniques and their application in producing recycled aggregate concrete (RAC). First, the pretreatment approaches for enhancing the properties of RCA are introduced. Next, the improved efficiency of these approaches and their influences on the workability, mechanical strengths, and permeability of RAC are analyzed and discussed. Subsequently, the effectiveness of different techniques and their cost/environmental impact are compared. Finally, some case studies of the application of RCA in infrastructure are presented, and the remaining challenges and perspectives are discussed. The results of this review work can extend the knowledge of RCA and RAC, as well as serving as a source of inspiration for further studies.

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