Experimental Investigation on Effect of High Temperature, Carbonation & Sulphate Attack on M50 Grade Concrete

The objective of this limited study is to provide an overview of the effects of temperature, carbonation and sulphate attack on high strength concrete. Reinforcement corrosion is major cause of the deterioration of concrete structure. In the carbonation atmospheric carbon dioxide reacts with hydrated cement and destroys its alkalinity. This affected on concrete durability. Sulphate in atmosphere, soil, ground water may cause damage to concrete in structure. Concrete can be affected by a chemical reaction involving sulphate that when present in contaminated hardcore along with a source of moisture, reacts with cement present in the concrete causing it to expand and crack. High temperature effects the compressive strength of concrete. Above 2120F the cement paste begins to dehydrate (loses chemically combined water of hydration), which gradually weakens the paste and paste aggregate bond.