Influence of carbonated recycled concrete aggregate on properties of cement mortar

Zhang, Jiake; Shi, Caijun; Li, Yake; Pan, Xiaoying; Poon, Chi Sun; Xie, Zhihui

doi:10.1016/j.conbuildmat.2015.08.087

Cited by 263 publications

(80 citation statements)

References 25 publications

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“…Furthermore, the carbonation treatment not only improved the new ITZs between the old adhered mortar and new mortar, but also improved the old ITZs between the aggregate and the old adhered mortar, as shown in Fig. 11 (Zhang et al 2015b). These findings agreed with Shi et al (2018), who explained that the carbonation treatment enhanced the quality of both old and new ITZs by achieving a greater micro-hardness and denser structure.…”

Section: Carbonation Techniquesupporting

confidence: 77%

Quality Improvement Techniques for Recycled Concrete Aggregate: A review

Shaban

Yang

et al. 2019

ACT

134

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The main problem in using recycled concrete aggregate (RCA) as a construction material is due to the weak adhered mortar which usually has higher porosity and water absorption. It also has lower strength compared to natural aggregate (NA), and it often forms weak interfacial transition zones in the recycled aggregate concrete (RAC). These weak zones lead to negative effects on the mechanical properties and durability performance of RAC. In order to utilize RCA in more effectively as aggregate in concrete, it is necessary to improve the quality and enhance the properties of the attached weak mortar. This paper reviews different treatment methods of RCA based on the published research, and systematically analyses the strengths and weaknesses as well as the applicability and limitations of each method. The advantages and disadvantages of each treatment method, in terms of their technical feasibility, efficiency, economic and environmental impacts, are also discussed, in view of facilitating the selection of the most suitable treatment method for RCA. Although most techniques have been examined and trialed under laboratory conditions, further investigations are required to determine the most effective approach for treating RCA, with consideration not only given to the laboratory scale, but also on a commercial production scale.

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Section: Carbonation Techniquesupporting

confidence: 77%

Quality Improvement Techniques for Recycled Concrete Aggregate: A review

Shaban

Yang

et al. 2019

ACT

134

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“…Major improvements of the microhardness of the old mortar and the new ITZ are a cause of this. As a result, properties of mortar and concrete prepared using treated recycled aggregates were significantly improved: carbonation treatment increased the flowability and compressive strength of the mortar [142] and compressive and flexural strength of concrete [140]. Furthermore, a decrease in chloride diffusivity was observed [142].…”

Section: Concrete Recyclingmentioning

confidence: 98%

“…For example, Li et al [139] suggested adjusting the concrete mixing sequence, while Zhang et al [141] suggested using a surface treatment of recycled aggregates using nanoparticles. Another promising approach seems to be a carbon dioxide treatment of recycled concrete aggregate [140,[142][143][144]. This approach uses accelerated carbonation for short periods (1 day-1 week) to improve the quality of recycled aggregates.…”

Section: Concrete Recyclingmentioning

confidence: 99%

Carbonation of cement paste: Understanding, challenges, and opportunities

Šavija

Luković

2016

Construction and Building Materials

568

218

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Cement paste is known to react with atmospheric carbon dioxide. Carbonation of cement paste has long been recognized as one of the causes of reinforcement corrosion. On the other hand, carbonation causes numerous chemomechanical changes in the cement paste, most notably changes in strength, porosity, pore size distribution, and chemistry. Furthermore, it can cause shrinkage and cracking of the cementitious matrix. The present review summarises the state of the art regarding the understanding and consequences of carbonation of cement paste. Apart from the passive process of reaction of atmospheric CO2 with cement paste, carbonation is sometimes used on purpose in order to improve certain properties of cementitious materials. This review further summarises recent efforts regarding active use of carbonation as a tool for manipulating certain properties of cement based materials.

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“…The moisture content of RCA significantly influenced the carbonation percentage since the dry matrix could not provide sufficient water for the carbonation reactions and the pores in the water saturated matrix was filled with water blocking CO2 penetration. Furthermore, the carbonation process proceeded rapidly within the first 2 h but slowed down sharply after that [26][27][28][29][30].…”

Section: Carbonationmentioning

confidence: 99%

Načini Poboljšanja Recikliranog Agregata – Pregledni Rad

Despotović¹

2016

Zbornik GFS

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Influence of carbonated recycled concrete aggregate on properties of cement mortar

Cited by 263 publications

References 25 publications

Quality Improvement Techniques for Recycled Concrete Aggregate: A review

Quality Improvement Techniques for Recycled Concrete Aggregate: A review

Carbonation of cement paste: Understanding, challenges, and opportunities

Načini Poboljšanja Recikliranog Agregata – Pregledni Rad

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