EFFECT OF CHLORIDE CONCENTRATION IN SOIL ON REINFORCEMENT CORROSION

ABSTRACT This paper presents results of a study conducted to evaluate the effect of chloride concentration in soil on corrosion of reinforcing steel in concrete. Concrete specimens prepared with Type I, Type V and silica fume cements were exposed to soil with a chloride concentration of up to 3%. The effect of chloride concentration in soil on corrosion of reinforcing steel was evaluated by measuring corrosion potentials and corrosion current density. After 18 months of exposure, the concrete specimens were broken and the extent of corrosion of the reinforcing steel was examined and the gravimetric weight loss due to corrosion was assessed. As expected, the degree of corrosion increased with the chloride concentration in the soil. The type of cement also influenced the reinforcement corrosion. For a particular chloride concentration, least reinforcement corrosion was noted in the silica fume cement concrete followed by Type I and Type V cement concrete. Based on the data developed in this study chloride threshold in soil for the three types of cements are suggested

EFFECT OF CHLORIDE CONCENTRATION IN SOIL ON REINFORCEMENT CORROSION

ABSTRACT This paper presents results of a study conducted to evaluate the effect of chloride concentration in soil on corrosion of reinforcing steel in concrete. Concrete specimens prepared with Type I, Type V and silica fume cements were exposed to soil with a chloride concentration of up to 3%. The effect of chloride concentration in soil on corrosion of reinforcing steel was evaluated by measuring corrosion potentials and corrosion current density. After 18 months of exposure, the concrete specimens were broken and the extent of corrosion of the reinforcing steel was examined and the gravimetric weight loss due to corrosion was assessed. As expected, the degree of corrosion increased with the chloride concentration in the soil. The type of cement also influenced the reinforcement corrosion. For a particular chloride concentration, least reinforcement corrosion was noted in the silica fume cement concrete followed by Type I and Type V cement concrete. Based on the data developed in this study chloride threshold in soil for the three types of cements are suggested

EFFECT OF AGGREGATE QUALITY ON THE PROPERTIES OF CONCRETE

This paper presents results of a study conducted to evaluate the effect of aggregate quality, particularly when they do not comply with the standard requirements, on the properties of concrete. Crushed limestone aggregates from six quarries, five of which did not satisfy one or more of the ASTM C 33 requirements, were utilized to prepare concrete specimens. The concrete specimens were tested to evaluate the mechanical properties, and sulfate- and corrosion-resistance. The results indicate that some of the drawbacks in terms of the C 33 criteria did not affect the physical properties and durability performance of concrete. The excessive magnesium soundness loss noted in some of the aggregates also did not influence the sulfate resistance of concrete

EFFECT OF AGGREGATE QUALITY ON THE PROPERTIES OF CONCRETE

This paper presents results of a study conducted to evaluate the effect of aggregate quality, particularly when they do not comply with the standard requirements, on the properties of concrete. Crushed limestone aggregates from six quarries, five of which did not satisfy one or more of the ASTM C 33 requirements, were utilized to prepare concrete specimens. The concrete specimens were tested to evaluate the mechanical properties, and sulfate- and corrosion-resistance. The results indicate that some of the drawbacks in terms of the C 33 criteria did not affect the physical properties and durability performance of concrete. The excessive magnesium soundness loss noted in some of the aggregates also did not influence the sulfate resistance of concrete