What is Green Concrete?Concrete which is made from concrete wastes that are eco-friendly are called as “Green concrete”. Green Concrete is a term given to a concrete that has had extra steps taken in the mix design and placement to insure a sustainable structure and a long life cycle with a low maintenance surface. e.g. Energy saving, CO2 emissions, wastewater. Today the word green is not just limited to colour, it represents the environment, which is surrounding us. “Green concrete” is a revolutionary topic in the history of concrete industry. This was first invented in Denmark in the year 1998 by Dr.WG. Concrete wastes like slag, power plant wastes, recycled concrete, mining and quarrying wastes, waste glass, incinerator residue, red mud, burnt clay, sawdust, combustor ash and foundry sand. The goal of the Centre for Green Concrete is to reduce the environmental impact of concrete. To enable this, new technology is developed. The technology considers all phases of a concrete construction’s life cycle, i.e. structural design, specification, manufacturing and maintenance, and it includes all aspects of performance, i.e.
- Mechanical properties (strength, shrinkage, creep, static behaviour etc.)
- Fire resistance (spalling, heat transfer etc.)
- Workmanship (workability, strength development, curing etc.)
- Durability (corrosion protection, frost, new deterioration mechanisms etc.)
- Thermodynamic properties (input to the other properties)
- Environmental aspects (CO2-emission, energy, recycling etc.)
- CO2 emissions shall be reduced by at least 30 %.
- At least 20 % of the concrete shall be residual products used as aggregate.
- Use of concrete industries own residual products.
- Use of new types of residual products, previously land filled or disposed of in other ways.
- CO2-neutral, waste-derived fuels shall substitute fossil fuels in the cement production by at least 10 %.
Advantages of Green Concrete
- Reduction of the concrete industry's CO2-emmision by 30 %.
- Increased concrete industry's use of waste products by 20%.
- NO environmental pollution and sustainable development.
- Green concrete requires less maintenance and repairs.
- Green concrete having better workability than conventional concrete.
- Good thermal resistant and fire resistant.
- Compressive strength behaviour of ceracrete with water cement ratio is similar to conventional concrete.
- Flexural strength of green concrete is almost equal to that of conventional concrete.
Limitations of Green Concrete
- By using stainless steel, cost of reinforcement increases.
- Structures constructed with green concrete have comparatively less life than structures with conventional concrete.
- Split tension of green concrete is less than that of conventional concrete.
Applications of Green Concrete
Fig: Green concrete dam
Fig: Green Concrete Bridge
Fig: Green Concrete building
Fig: Green Concrete Platform
Fig: Green Concrete Columns
Fig: Green Concrete Hut