Modification of construction waste derived recycled aggregate via CO2 curing to enhance corrosive freeze-thaw durability of concrete

Peng, Xi; Shi, Feiting; Yang, Jing; Yang, Qiuwei; Wang, Hui; Zhang, Junyi

doi:10.1016/j.jclepro.2023.137016

Cited by 25 publications

(3 citation statements)

References 48 publications

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“…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]. Therefore, carbonation can reduce RCA's porosity.…”

Section: Accelerated Carbonationmentioning

confidence: 99%

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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Section: Accelerated Carbonationmentioning

confidence: 99%

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

Han

Zhao²,

et al. 2023

Buildings

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“…Coating recycled aggregates with graphene oxide can promote the generation of more C-S-H gel at the junction of cement between recycled aggregates and fresh mortar under the action of hydrophilic functional groups, thereby reducing the porosity of ITZ and increasing the elastic modulus and stiffness [ 15 , 16 , 17 ]. The CO 2 curing treatment can not only effectively fill the pores and internal micro-cracks of RCAs but also increase the hardness of the ITZ [ 18 , 19 , 20 , 21 ]. Acid immersion treatment can remove the mortar attached to the surface of RCAs, reducing the porosity of the ITZ between them and the cement matrix [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Freeze–Thaw Cycle Durability and Mechanism Analysis of Zeolite Powder-Modified Recycled Concrete

Yu,

Zhang,

Cao

et al. 2024

Materials

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The inferior mechanical performance and freeze–thaw (FT) resistance of recycled concrete are mostly due to the significant water absorption and porosity of recycled coarse particles. In this study, different dosages of zeolite powder were used in recycled concrete. A series of macroscopic tests were used to evaluate the workability and FT durability of zeolite powder-modified recycled concrete (ZPRC). X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to reveal the micro-mechanisms of FT resistance in ZPRC. The results show that the increase in zeolite powder content leads to a decrease in the slump and water absorption of ZPRC. Additionally, ZPRC with 10% zeolite powder has superior mechanical characteristics and tolerance to FT conditions. The higher strength and FT resistance of the ZPRC can be attributed to the particle-filling effect, water storage function, and pozzolanic reaction of zeolite powder, which results in a denser microstructure. The particle-filling effect of zeolite powder promotes the reduction of surface pores in recycled coarse aggregates (RCAs). The water storage function of zeolite powder can provide water for the secondary hydration of cement particles while reducing the free water content in ZPRC. The pozzolanic reaction of zeolite powder can also promote the generation of hydrated calcium silicate and anorthite, thereby making the microstructure of ZPRC more compact. These results provide theoretical guidance for the engineering application of recycled concrete in cold regions.

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“…In extreme environments, the corrosion of RPC is better than that of the corrosive medium. Meanwhile, the service life of Marine buildings has been extended due to RPC's superior durability and mechanical properties; it is feasible to reduce the influence of chloride ion penetration [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Influence of NaCl Solution External Erosion on Corrosion Resistance of RPC Reinforced with Straw Fiber

et al. 2023

Self Cite

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Straw fiber, as a kind of waste if not properly treated, will pollute the environment. It can be used in cement-based materials as a plant fiber material. Agricultural solid-waste straw fiber has good tensile properties and is expected to be used as a fiber-reinforced material for reactive powder concrete (RPC) and to improve the corrosion resistance of RPC. In this paper, the ultrasonic velocity through specimens, the electrical resistance, the AC impedance spectroscopy and tafel curve were analyzed. The corrosion resistance of the steel bar under the chloride salt freeze–thaw cycles and dry–wet alternations was systematically studied. The result shows that adding a certain content of straw fiber can improve its corrosion resistance. Under the action of two chloride salt environments, the lowest mass loss rate was 0.82% for the sample with 3% straw fiber content and the mass growth rate of the specimens with 4% straw fiber is the highest aqt 0.9%. In terms of ultrasonic velocity, the lowest loss rate was 5.68% for specimens with fiber content of 2%. The specimens were subjected to 0 dry–wet alternations and freeze–thaw cycles; the highest electrical resistance is 19.96 kΩ when the fiber content is 1% and the lowest electrical resistance is 11.105 kΩ when the fiber content is 2%. Under the dry–wet alternations, the content of straw fiber and its corrosion resistance are: 1% > 4% > 0% > 3% > 2%. Under freeze–thaw cycles, the content of straw fiber and its corrosion resistance were as follows: 1% > 0% > 4% > 3% > 2%.

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Modification of construction waste derived recycled aggregate via CO2 curing to enhance corrosive freeze-thaw durability of concrete

Cited by 25 publications

References 48 publications

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

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

Freeze–Thaw Cycle Durability and Mechanism Analysis of Zeolite Powder-Modified Recycled Concrete

Influence of NaCl Solution External Erosion on Corrosion Resistance of RPC Reinforced with Straw Fiber

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