Cement

الوصف

Low C3A Content: Sulphate salts present in these soil combine with moisture and tri-calcium alumnate (C3A) , one of the constituents of cement to form a compound known as Sulpho. Alumnate off Hydrated Calcium. This compound is highly expansive and gradually results in the destruction of concrete. However, if a C3A content is very low , it is rendered inert and there is thus no reaction at all. British and Pakistani standards specify that in a Sulphate Resistant Cement, the C3A content must not exceed 3.5%. ***** Sulphate Resistant Cement has a much lower C3A content, making the cement highly effective against Sulphate attacks. Low Heat of Hydration: Heat of hydration is the heat generated on reaction of cement and water. This is undesirable because it produces a corresponding thermal expansion which deforms the concrete. Upon cooling down, there is a thermal contraction which causes the concrete to crack. ***** Sulphate Resistant Cement has a low heat of hydration making it EXTREMELY SUITABLE for BULK POURING and MASS CONCRETING. High Strength: As with any type of cement, strength is the fundamental property of Sulphate Resistant Cement *****. Sulphate Resistant Cement achieves high strength through finer grinding and better particle distribution. In term of strength, , it not only exceeds by far the standards specified for Sulphate Resistant Cement, but also exceeds those of Ordinary Portland cement Low Alkali Content: Certain aggregates contain alkali sensitive ingredients, which under unfavorable conditions , can result in expansion leading to cracking of concrete. The presence of alkali also causes staining and other undesirable effects on concrete. American Standards specify that a cement can be termed low-alkali if its alkali content does not excced 0.6% *****. Sulphate Resistant Cement has an alkali content below 0.6 and a unique distinction of being a Sulphate Resistance Cement that can also be classified as low - alkali cement.