Experimental Investigation of Chloride Ion Penetration and Reinforcement Corrosion in Reinforced Concrete Member

Abstract

This paper represents the experimental investigation of chloride penetration into plain concretes and reinforced concretes. The main objective of this work is to study the main influencing parameters affecting corrosion of steel in concrete. Plain cement concrete and reinforced cement concrete with different water-cement ratios and different cover depth were subjected to ponding test. Ponding of specimens were done for different periods into 10% NaCl solution. Depth of penetration of chloride solution into specimens was measured after ponding. Specimens were crushed and reinforcements were washed using HNO 3 solution and weight loss due to corrosion was calculated accordingly. There was a linear relationship between depth of penetration and water-cement ratio. It was also observed that, corrosion of reinforcing steel increases with chloride ponding period and with water-cement ratio. Corrosion of steel in concrete can be minimized by providing good quality concrete and sufficient concrete cover over the reinforcing bars. Water-cement ratio has to be low enough to slow down the penetration of chloride salts into concrete.

The effect of Caspian Sea water on mechanical properties and durability of concrete containing rice husk ash, nano $${\varvec{\hbox {SiO}_2}}$$, and nano $${\varvec{{\hbox {Al}}_{2}{\hbox {O}}_{3}}}$$

“…Therefore, an increase in the percentage of NA, RHA, and NS reduces the depth of water and chloride ion penetration. Al Mamun and Islam 104 reported the same decrease in the penetrability of the chloride ions with the increase in RHA dosage.

Figure 10 Average depth of water penetration at 28 days for different percentages of RHA, NS, NA replacement.

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Performance of Sustainable Green Concrete Incorporated With Fly Ash, Rice Husk Ash, and Stone Dust

“…The most concerning matter of the FA-based concrete is the low strength development rate at an early age due to a low reactivity [25]; but it can gain strength over a long period. Moreover, an ordinary concrete slows down the strength gaining at around 56 days of curing, sometimes stopping altogether, but the FA concrete shows a gradual improvement in strength over a long period of time [3,26]. The improvement in strength depends on the class and fineness of the FA and other ingredients and admixtures.…”