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GREEN CONCRETE

1. What is Green Concrete ?
2. Where does the Carbon Dioxide come from in concrete ?
3. Features of Green Concrete
4. Materials for Green Concrete
5. Cementitious materials - Fly Ash
6. Advantage Of Green Concrete
7. SUITABILITY OF GREEN CONCRETE IN STRUCTURES
8. SCOPE IN INDIA

What is Green Concrete ?
Green Concrete is environmental friendly concrete.
Concrete that uses less energy in its production
& produces less carbon dioxide than normal
concrete is Green Concrete
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Where does the Carbon Dioxide come from in
concrete ?
i) Cement:
Most of CO2 in concrete is from the cement manufacturing process. A
typical cubic meter of concrete contains about 10% cement by weight. The
reaction in the process of Cement manufacture is:
ii) Aggregate:
Use of virgin aggregates contributes about 1% of all CO2 emissions from a
typical cubic meter of concrete. Therefore, the use of alternate aggregate is
desirable. The use of local and recycled aggregates is desirable as it can
reduce transportation and fuel cost and support sustainable development.
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Features of Green Concrete
The concrete which can fall in the category of green must have the
following characteristics.
‣ Optimizes use of available materials
‣ Better Performance
‣ Enhanced cohesion workability / consistency
‣ Reduced shrinkage / creep.
‣ Durability - Better service life of concrete
‣ Reduced carbon footprint
‣ No increase in cost
‣ LEED India Certification
Green concrete mix is designed with the principle of "Particle-Packing
Optimization" to meet requirements of plastic and hardened properties.
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Materials for Green Concrete
Green construction materials are composed of renewable, rather than non
renewable resources. Green materials are environmentally responsible
because impacts are considered over the life of the product. Depending
upon project-specific goals, green materials may involve an evaluation of
one or more of the following criteria.
1. Locally available
2. Salvaged, re-furnished, or re-manufactured
3. Reusable or recyclable
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Coarse Aggregates are:
Materials for Green Concrete
Fresh Local Aggregate
Recycled Demolition Waste Aggregate
Recycled Concrete Material (RCM)
Blast Furnace Slag (BFS)
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Fine Aggregate s are:
Materials for Green Concrete
Manufactured Sand For Concrete
Recycled Glass Aggregate
Blast Furnace Slag (BFS)
Fly Ash
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Cementitious materials - Fly Ash
Fly ash is a by-product produced during the operation of coal-fired power
plants. The finely divided particles from the exhaust gases are collected in
electrostatic precipitators. These particles are called Fly ash.
Advantages Of Using Fly Ash in Concrete:
1. Utilization of fly ash as a part replacement of cement or as a mineral
admixture in concrete saves on cement and hence the emission of
CO2.
2. Use of good quality fly ash in concrete has shown remarkable
improvement in durability of concrete, especially in aggressive
environment.
3. Some of the technical benefits of the use of fly ash in Green Concrete
are:
a) Higher ultimate strength
b) Increased durability
c) Improved workability
d) Reduced bleeding
e) Increased resistance to alkali-silica reactivity.
f) Reduced shrinkage.
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Advantage Of Green Concrete
1. Optimized mix designs mean easier handling, better consistency and
easier finishing.
2. Reduction in shrinkage & creep.
3. Green Concrete uses local and recycled materials in concrete.
4. The heat of hydration of green concrete is significantly lower than
traditional concrete.
5. This result in a lower temperature rise in large concrete pours which
is a distinct advantage for green concrete.
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SUITABILITY OF GREEN CONCRETE IN STRUCTURES
Several factors which enhances the suitability of green concrete in
structures include:
1. Reduce the dead weight of a structure and reduce crane age load; allow
handling, lifting flexibility with lighter weight.
2. Good thermal and fire resistance, sound insulation than the traditional
granite rock.
3. Improve damping resistance of building.
4. Reduction of the concrete industry's CO2-emission by 30 %.
5. Increased concrete industry's use of waste products by 20%.
6. No environmental pollution and sustainable development.
7. Green concrete requires less maintenance and repairs.
8. Compressive strength behaviour of concrete with water cement ratio is
more than that of conventional concrete.
9. Flexural strength of green concrete is almost equal to that of
conventional concrete.
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SCOPE IN INDIA
Green concrete is a revolutionary topic in the history of concrete industry.
As green concrete is made with concrete wastes it does take more time to
come in India because of industries having problem to dispose wastes and
it also reduces environmental impact with reduction in CO2 emission. Use
of green concrete can help us reduce a lot of wastage of several products.
Various non-biodegradable products can also be used and thus avoiding the
issues of their disposal.
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