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Title: Life Prediction of Concrete Mixed with Nano-CaCO3 in Semi-Immersed Corrosive Environment

Author(s): T. Hakuzweyezu, H. Qiao, C. Lu, J. Twagirumukiza, and B. Yang

Publication: Materials Journal

Volume: 119

Issue: 5

Appears on pages(s): 51-62

Keywords: Birnbaum-Saunders (B-S); durability; life prediction; nano- CaCO3; reliability; sulfate attack

Date: 9/1/2022

Abstract:
External sulfate attack (“sulfate attack” hereafter) is one of the most important factors that influences the long-term durability of concrete structures when exposed to aggressive environments. Concrete can expand, crack, and lose strength as a result of sulfate attack. This paper presents the results from an experimental investigation on nano-CaCO3-modified concrete under sulfate attack. The specimens were exposed to a partially submerged condition in 10% Na2SO4 solution. The mechanical and durability performance were evaluated based on durability evaluation parameters. Eventually, the Birnbaum-Saunders (B-S) life prediction model was used to assess the long-term performance of the tested mixtures. The results show that when the content of nano-CaCO3 is 1%, the resistance of concrete to sulfate attack is greatly increased, and the service life of concrete structures is increased significantly. Moreover, using a reliability approach, the proposed model can effectively describe the degradation process of concrete under sulfate attack.


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