Bond Loss between Metakaolin-Incorporated Structural Lightweight Self-Consolidating Concrete and Corroded Steel Reinforcement


Sancak E., Hossain K. M. A. , Lachemi M.

JOURNAL OF MATERIALS IN CIVIL ENGINEERING, cilt.29, 2017 (SCI İndekslerine Giren Dergi) identifier identifier

Özet

There has been inadequate investigation into the effect of steel reinforcement corrosion on the bond strength between steel rebar and structural self-consolidating lightweight concrete (SCLWC). This study investigates the physical and mechanical properties of developed SCLWC mixtures and their effectiveness in reinforcement corrosion prevention. Cylindrical pullout specimens made of SCLWC mixtures [incorporating 2-4% of metakolin (MK) and 10-12% of fly ash by weight of total cementitious materials] with a centrally embedded 20-mm-diameter reinforcing bar were used to study the effect of corrosive environment on bond behavior. A 5% NaCl solution was used as a corrosive environment and 0.05A of direct current was applied for accelerated corrosion during the duration of testing. For noncorroded specimens, the highest bond strength was exhibited by specimen made of SCLWC with 0% MK. The specimens made of SCLWC with 4% MK showed highest bond strength (both normalized and unnormalized) when exposed to accelerated corrosion for a theoretical reinforcement mass loss of 2 and 5%. Besides, specimens with 4% MK showed highest resistance against chloride ion penetration. (C) 2016 American Society of Civil Engineers.