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
DOI:
10.14359/51735973
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.