Concreel HD Cement

Slag cement is a type of hydraulic cement and is produced when granulated blast furnace slag (GGBFS) is finely ground and used to replace a portion of Ordinary Portland Cement (OPC ). Slag is one of the recovered industrial by-products from blast furnaces of a steel plant. Molten slag diverted from the iron blast furnace is rapidly chilled. This helps to produce glassy granules that yield desired reactive cementitious characteristics when ground into cement fineness. Slag cement has various additional benefits which makes the structure more durable.

Followings are the qualities of Concreel HD which makes it superior to other slag cements:

• A cement with highest initial strength as well as final strength
• Being a slag cement gives very high durability of structure along with high strength i.e a dual combination of slag cement properties and high early strength development properties
• Outperforms all reputed cement brands available in the market in terms of quick setting early strength development, chemical resistance and superb cohesiveness of the mix.

Thus, for any types of concreting works e.g. foundations, beams, columns and roof casting this is the best cement available in the market today.

Followings are the main steps for slab casting:

• Step – 1 Placing of formwork with proper support system
• Step – 2 Placing of reinforcement as per design using cover blocks
• Step – 3 Mixing of concrete properly using right proportion of cement, sand and aggregates
• Step – 4 Pouring of concrete at site
• Step – 5 Compaction of concrete using vibrators
• Step – 6 Proper curing of concrete after the concrete is set to avoid loss of water from the concrete and to develop desired strength in it.

While cement continues to be an important building material, the process of manufacturing cement is also a major cause of industrial air pollution. The production of clinker, which happens to be a key ingredient in cement, is the principal source of emission of noxious gases, especially carbon dioxide. Green cement is produced through a carbon-negative manufacturing process. Simply put, green cement is produced as the final product of a technologically advanced process, such that the emissions during unit operations (like clinker production) are minimised, is known as green cement. Green cement is an eco-friendly product which solves some of the construction industry’s most critical environmental issues by bringing down the carbon footprint of cement production. There are multiple technologies and mechanisms for green cement manufacturing, patented by different manufacturing agencies.

• Workability: This is determined by the ease with which concrete can be placed and compacted fully without segregating and bleeding
• Segregation: It is the process by which coarse particles are separated from green concrete
• Bleeding: This is when there is an appearance of water and cement particles on the surface of the freshly laid concrete
• Harshness: This property offers concrete resistance to its surface finish

Green concrete constitutes environment-friendly as well as recycled material from construction and demolition waste, and can be used for construction purposes.

Green concrete is conventional concrete, which is made by using green cement and utilising waste cementitious materials for construction. Using green concrete helps reduce the environmental impact of conventional concrete. Therefore, replacing concrete ingredients with construction and demolition waste is recommended. Concrete produced with recycled or waste material as well as with substitutes bears less impact on the environment.

• Reduction of CO2-emmision by ~30%
• Increases the industry's use of waste products
• Ensures sustainable development
• Requires less maintenance and repairs
• Green concrete has better workability than conventional concrete
• Good thermal and fire resistance
• Compressive strength behaviour of green concrete to that of conventional concrete with same water cement ratio is similar
• Flexural strength of green concrete is like that of conventional concrete

Green concrete comes with several different properties in the mix design and placement to ascertain a more durable structure with reduced environmental impacts for wastewater, CO2 emissions and energy saving.

Some of the most ancient use of slag cement can be dated back to 1700s when the material was combined with lime to make mortars. Until the 1950s, granulated slag was used in the manufacturing of blended portland cements. It was also used as raw feedstock to make cement clinker. However, in the 1950s, slag cement became available in other countries as an individual product in itself. The first granulation facility in the U.S. was set up to make a separate slag cement product and it was an initiative by Sparrows Point, Maryland, in the early 1980s. In recent times, the supply and acceptance of slag cement has grown dramatically. The product is now widely available.

Slag cement is most used in concrete, either in the form of a separate cementitious component or as part of a blended cement. It works synergistically with portland cement to increase strength, reduce permeability, improve resistance to chemical attack and inhibit rebar corrosion. Slag cement is used in most concrete applications, including:

• Concrete pavements
• Pipe and block
• Structures and foundations
• Mass applications in dams or retaining walls
• Precast and pre-stressed concrete
• Concrete exposed to harsh environments, such as wastewater treatment and marine applications
• High-rise structures or service bridges
• Also used in non-concrete applications like soil-cement and hazardous waste solidification

There are several environmental benefits of using slag cement because it is a recovered material from the iron production process and because of this, it helps reduce the environmental impact of concrete mixtures. In addition to that, slag cement is very effective in reducing permeability and increasing durability in concrete.

Slag cement can provide equal or higher levels of compressive strength in concrete in comparison with Ordinary Portland Cement (OPC) concrete of equal cementitious materials content. Slag cement proportions of 50-60% normally optimise strength along with imparting several special durable properties in concrete.

Green concrete is a type of eco-friendly concrete that is manufactured using waste or residual materials from diverse industries, and requires less units of energy for production. In comparison to traditional concrete, green concrete produces less carbon dioxide, and is widely considered to be cheaper and more durable.

• Reducing greenhouse gas emissions
• Reducing the use of natural resources, such as limestone, shale, clay, natural sand and rocks
• Reusing waste materials in concrete to bring down pollution