Electrochemical study on the effect of high volume fly ash on the corrosion of reinforcement in self compacting concrete slab panels

Abstract

In aggressive environmental conditions, corrosion of rebars affects the life of RC structures. Pathways for quick ingress of chloride and water are the pores, voids and cracks in concrete which affect the load bearing capacity and life of structures. Use of pozzolanic materials in concrete provide good protection to the reinforcement from chloride attack due to the pores filling and microstructural refinement internally. The present work investigates the maximum load carrying capacity, peak deflection, residual flexural strength, energy absorption capacity, mass loss and compressive strength of M20 grade High volume fly ash SCC slab panels when exposed to saline environment by partial replacement of cement (0%, 25%, 35%, 45%) at 0%, 5% degree of corrosion using accelerating corrosion technique justifying the suitability of HVFA SCC for structural concrete applications. HVFA SCC one-way slab panels of 700mmx300mmx60mm are cast with steel reinforcement having yield strength of 500 MPa. In a particular fly ash percentage and corrosion percentage level, one slab panel was tested. Experimental results show that the maximum load carrying capacity, peak deflection, energy absorption capacity, mass loss, residual flexural strength, compressive strength of HVFA SCC is less than 20% compared to 0% fly ash SCC specimens.