Effect of Fly Ash and Slag on the Steel Bars Corrosion in Accelerated Carbonation Cured Mortars
SONG Baixing1,3,4,*, SHI Caijun2,*, KE Guojun1,4
1 Key Laboratary in Special High Performance Concrete of Hunan Province, College of Civil Engineering, University of South China, Hengyang 421001, Hunan, China 2 College of Civil Engineering, Hunan University, Changsha 410082, China 3 Department of Civil & Environmental Engineering, National University of Singapore, 117576, Singapore 4 Laboratory in high performance concrete of China nuclear construction, Hengyang 421001, Hunan, China
Abstract: Accelerated carbonation curing has attracted increasing attentions as its advantages such as decreasing the carbon footprint and enhancing the durability of cement-based materials. However, the effects of fly ash and slag on the durability of accelerated carbonation cured cement-based materials, in particular the corrosion behaviors of rebars is unclear yet. To systematically study the effects of fly ash and slag on the corrosion resistance of accelerated carbonation cured cement mortars, the corrosion behaviors of rebars were measured in three corrosion environments, including simulated pore solution, wetting-drying cycling in chloride ions solution as well as under the coupling action of stray current and chloride ions. The results show that the addition of fly ash and slag prolongs the time for the steel bars to form stable passive film and decreases the chloride threshold concentration in accelerated carbonation cured mortars. The reinforcement corrosion resistance of the accelerated carbonation cured mortars decreases with the increase of fly ash and/or slag content, especially when its dosage exceeds 25%.
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2026, Vol. 40 
