DALMIA 43 GRADE
The 43 Grade OPC cement manufactured at Dalmia units possesses superior level of quality. Our test certificates (see test certificate section on site) of the product depicts vividly that the quality level of the 43 Grade OPC cement is far superseding the specified requirements of the product. Some of the salient features of the product are given below:-
1. Gigantic compressive strength for superior grade of concrete and for economizing the project:
Dalmia Cement manufacturing units are blessed with consistent quality of cement grade Lime stone, which makes it possible to go for the most stringent quality standards and hence the compressive strength obtained for Dalmia 43Gr.OPC is superior and at least 10 Mpa higher than the specified requirements of BIS standards for all ages viz 3 days, 7days and 28days.
2. Volume stability:
Volume stability is an important character of the cement that affects the durability. The volume stability of the cement is mainly influenced by two parameters viz. Free Lime and Magnesia. These ingredients, when present in cement, exhibit a strange phenomenon as explained below. While other components undergo normal hydration, they remain dormant in the beginning and goes for a late reaction which involves expansion after a period of 5-7 years, when the whole structure has totally hardened.
3. Corrosion Resistance:
Chloride is another deleterious content in ordinary cement that attacks the steel reinforcement of RCC. The chloride contained in ordinary cements are highly soluble and hence the corrosion reaction initiates even when the concrete is green. The corrosion reaction of steel takes place in several stages, finally leading to the formation of Hydrated ferric Oxide, which has 6 times higher volume than original steel, which results in de-lamination of concrete cover from the underside of the concrete RCC slab, exposing the reinforcements to further atmospheric attacks. To protect the construction and the customer happiness, BIS has restricted the presence of chloride in cement to 0.1%, whereas Dalmia OPC 43 is a special product, unique by itself, with only 0.008% of chloride in it making it thoroughly chloride resistant.
4. Low heat of hydration which is comparable to LHPC;-
As you are aware, high heat of hydration of cement play havoc in concrete for massive pour.