Prediction of Corrosion Resistance of Concrete Containing Natural Pozzolan from Compressive Strength

2nd International Conference on Innovative Materials, Structures and Technologies

Al-Swaidani, A.M.^1,2 ; Ismat, R.^2 ; Diyab, M.E.^2 ; Aliyan, S.D.^3

Arab International University (AIU), Faculty of Architectural Engineering, Damascus, Syria^1

Order of the Syrian Engineers, Damascus, Syria^2

Syrian Arab Organization for Standardization and Metrology (SASMO), Damascus, Syria^3

关键词: Accelerated corrosion tests;    Concrete mix design;    Concrete specimens;    Correlation equation;    Corrosion initiation;    Corrosion performance;    Effective approaches;    Reinforcement corrosion;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/96/1/012007/pdf
DOI  :  10.1088/1757-899X/96/1/012007

来源: IOP

【 摘 要 】

A lot of Reinforced Concrete (RC) structures in Syria have suffered from reinforcement corrosion which shortened significantly their service lives. Probably, one of the most effective approaches to make concrete structures more durable and concrete industry on the whole - more sustainable is to substitute pozzolan for a portion of Portland cement (PC). Syria is relatively rich in natural pozzolan. In the study, in order to predict the corrosion resistance from compressive strength, concrete specimens were produced with seven cement types: one plain Portland cement (control) and six natural pozzolan-based cements with replacement levels ranging from 10 to 35%. The development of the compressive strengths of concrete cube specimens with curing time has been investigated. Chloride penetrability has also been evaluated for all concrete mixes after three curing times of 7, 28 and 90 days. The effect on resistance of concrete against damage caused by corrosion of the embedded reinforcing steel has been investigated using an accelerated corrosion test by impressing a constant anodic potential for 7, 28 and 90 days curing. Test results have been statistically analysed and correlation equations relating compressive strength and corrosion performance have been developed. Significant correlations have been noted between the compressive strength and both rapid chloride penetrability and corrosion initiation times. So, this prediction could be reliable in concrete mix design when using natural pozzolan as cement replacement.