CO2-induced evolution of chemical, structural and mechanical properties of reinforced concrete: A review

Xue, Quan; Zhang, Liwei; Mei, Kaiyuan; Li, Xiaochun; Newell, Pania; Wang, Yan; Cheng, Xiaowei; Zheng, Wei

doi:10.1016/j.conbuildmat.2022.129069

Cited by 6 publications

(1 citation statement)

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“…precipitation further promotes the expansion of microcracks. Finally, the structural failure and strength loss occur in cement-based materials caused by excessive carbonation [50,51]. Under the influence of high pressure and high concentration of CO 2 , cement-based materials are prone to excessive carbonation, which induces the porosity to decrease but weakens the strength of cement-based materials.…”

Section: Figurementioning

confidence: 99%

Perspective Chapter: Pore Structure Evolution of Cement and Concrete Induced by CO2 Carbonation

Zhang,

Gan,

Xue

2024

Transport Perspectives for Porous Medium Applications

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This chapter explores the profound impact of CO2 carbonation on the pore structure of cement and concrete. Carbonation, resulting from the reaction of CO2 with calcium hydroxide and calcium silicate hydrate in cement, is a complex process that affects the durability and performance of cement-based materials. In this chapter, the changes in pore structure of cement and concrete induced by carbonation are examined. Under low pressure CO2, cement carbonation leads to the formation of dense carbonation regions. For wellbore cement exposed to high pressure and high concentration of CO2, a calcite precipitation layer with very low porosity is formed in cement, and two highly porous layers due to dissolution of calcite and cement hydration products are formed at both sides of the calcite precipitation layer. For concrete exposed to atmospheric pressure CO2, carbonation causes hydration products to form CaCO3 and precipitate in pores. Different from wellbore cement, no distinct calcite precipitation layer is formed in concrete. However, for concrete exposed to 1 MPa CO2, excessive accumulation of CaCO3 eventually leads to expansion and cracking of pores, which causes the compressive strength of concrete to decrease after reaching the peak.

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Section: Figurementioning

confidence: 99%