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As per the great success achieved by Jagdamba Cement Industries Pvt. Ltd. in Bhairahawa (established in B.S. 2057) by producing PPC and OPC cement, soon we brought Shuba Shree Jagdamba Cement Mills Pvt. Ltd., Birgunj in B.S. 2061 for the production of High quality OPC and PSC cement.
Under this Industry, we are producing
This cement is produced by mixing Portland cement clinker, gypsum and granulated Blast Furnace slag in suitable proportions and grinding the mixture to get a thorough and intimate mixture between the constituents. According to the control over physical and chemical specification slag is mixed up to 25-65%. Slag is a byproduct in the manufacture of pig iron. Chemically, slag is a mixture of Lime, silica and alumina, that is, the same oxides that make up Portland cement. Cementitious properties are generated when Ground granulated slag reacts with water.
Using slag cement to replace a portion of Portland cement in a concrete mixture is an efficient way to make concrete more consistent. Among the measurable improvements are higher workability, higher finishability, lower permeability, improved resistance to aggressive chemicals, more consistent plastic and hardened properties, and higher compressive and flexural strengths.
Concrete with slag is easier to work and less susceptible to freeze thaw cycles.
Prevention against Chemical Hazards
Use of Slag Cement significantly reduces the risk of damages caused by alkali–silica reaction (ASR), provides higher resistance to chloride ingress — reducing the risk of reinforcement corrosion — and provides higher resistance to attacks by soils and water containing excess amount of sulfates or alkali metals, alumina and iron, as well as to acidic waters.
Concrete containing Slag cement has a higher ultimate strength than concrete made with Portland cement. It has a higher proportion of the strength-enhancing calcium silicate hydrates (CSH) than concrete made with Portland cement only, and a reduced content of free lime, which does not contribute to concrete strength. Concrete made with Slag cement continues to gain strength over time, and has been shown to double its 28-day strength over periods of 10 to 12 years.
Concrete containing ground granulated slag develops strength over a longer period, leading to reduced permeability and better durability.
Prevention against Crack
Concrete made with Slag cement sets comparatively slowly than concrete made with ordinary Portland cement, depending on the amount of Slag in the cementitious material, but also continues to gain strength over a longer period in production conditions. This results in lower heat of hydration and lower temperature rises, which helps to concrete prevents from cracking.
Being Slag cement very fine, the concrete made by using slag cement has better resistuvity against permeability.
Greater resistance to chlorides and sulfates can help to reduce corrosion of steel reinforcement and deterioration of the structure. In most developed countries, is now specified in structural concrete for bridge piers and abutments for protection against chloride attack. The use of Slag in such instances will increase the life of the structure by up to 50% had only Portland cement been used, and precludes the need for more expensive stainless steel reinforcing.
Slag is also routinely used to limit the temperature rise in large concrete pours. The more gradual hydration of Slag cement generates both lower peak and less total overall heat than Portland cement. This reduces thermal gradients in the concrete, which prevents the occurrence of micro cracking which can weaken the concrete and reduce its durability.
In contrast to the stony grey of concrete made with Portland cement, the near-white color of Slag cement permits architects to achieve a lighter color for exposed fair-faced concrete finishes, at no extra cost. To achieve a lighter color finish, Slag is usually specified. Slag cement also produces a smoother, more defect free surface, due to the fineness of the Slag particles. Dirt does not adhere to Slag Cement concrete as easily as concrete made with Portland cement, reducing maintenance costs. Slag cement prevents the occurrence of efflorescence, the staining of concrete surfaces by calcium carbonate deposits. Due to its much lower lime content and lower permeability, Slag is effective in preventing efflorescence when used at appropriate levels.
From an environmental viewpoint, the use of slag cement in concrete serves to make concrete “greener.” Not only is slag cement can be considered a recycled material, but it can also significantly reduce energy consumption and greenhouse gasses emitted in the production of concrete raw materials.
This previously unwanted recycled product is used in the manufacture of high performance concretes.
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