Effect of Formwork Liner on Durability and Corrosion Characteristics of Self Compacting Concrete

Abstract

Recent advancements in improving the quality of cover concrete opened a new pathway known as controlled permeable formwork (CPF). In CPF liner, the air and water molecules were trapped in the concrete/formwork interface to spill/drain from concrete surface, at the same time retaining smaller cement and other fine particles. This novel approach, lowers the porosity of concretes surface area thereby mutually tends to improve/enrich the cement content. Another key advantage of this CPF liner system is its tendency to lower the proportion of w/c ratio (water-to-cement). The present experimental research work intends to analysis the impact of CPF liner regarding factors such as durability, corrosive nature along with chloride ingress of self compacting concrete (SCC) (reinforced) sample. For experimentation, initially the castings of concrete samples were done in relation to CPF liner and impermeable formwork (IMF) samples. Followed by various tests at different operating stages to evaluate rapid chloride penetration, chloride regress, chloride migration and accelerated rebar corrosion. On experimentation it can therefore be summed up as, CPF concrete attained phenomenal ability towards Cl ion ingress by 52%–71%. Moreover, the results also indicated that time for concrete cracking in relation to CPF liner was increased to about 1.8 times in comparison with conventional IMF concrete.