Effect of Corrosion Inhibitors in Limestone Cement

Evgenia Zacharopoulou,George Batis,Sotirios Tsivilis,Aggeliki Zacharopoulou,Atteyeh Sayedalhosseini

doi:10.4236/msa.2013.412a003

Abstract

In this paper examines the improving durability of different limestone cement and effects of the use of corrosion inhibitor. The target is to experimentally investigate the effect of different types of cement in corrosion of reinforcement in presents of corrosion inhibitors and without it. Three types of cement have been used: CEM II, LC1 and LC2. For this purpose constructed mortar specimens, containing 4 reinforcements, with or without corrosion inhibitors for each group, these exhibited to partial immersion in sodium chloride in 3.5% w.t NaCl solution. The methods, with which the corrosion of reinforcement in concrete was tested, were measurements of corrosion potential, corrosion current and mass loss of reinforcement. The mortars with CEM II cement have better durability than that with limestone cement. The use of VpCI, Cyclohexylammonium benzoate, improves the corrosion protection of mortars with CEM II cement upper 50%. On the other hand, the addition of VpCI, Cyclohexylammonium benzoate, improves the corrosion protection of mortars with limestone cement 30% or lower.

Highlights

The cement industry continues to introduce more sustainable practices and products for constructing and maintaining our concrete infrastructure and buildings
It is known that the concrete or mortars with limestone cement have lower durability as concrete or mortars with CEM I and CEM II cement [13]
It is known that the addition of corrosion inhibitors such as calcium nitrite, N-N’-dimethylaminoethanol increases the protection of rebars of mortars or concrete from corrosion in chloride environment [6,10]

Summary

Introduction

The cement industry continues to introduce more sustainable practices and products for constructing and maintaining our concrete infrastructure and buildings. That sustainable development focus, proposed implementation of more restrictive environmental regulations on cement manufacturing, and a legislation of potential global climate change has prompted the US cement industry to propose provisions for Portland-limestone cements within specifications ASTM C595 [1] and AASHTO M240 [2]. Portland-limestone cements are in common use around the world. Limestone that is provided from the European standard EN 197-1 (CEN 2000) allows cements to contain limestone in three different dosage levels. CEM I, “Portland cement”, may contain up to 5% minor additional constituents, of which limestone is one possible material. CEM II/A-L and CEM II/B-L, both called “Portland limestone cement”, contain 6% to 20% and 21% to 35% ground limestone, respectively. Fine limestone particles may promote silicate hydration by providing nucleation sites for C-S-H precipitation

Methods

Results

Conclusion