What do you know about Green concrete?
Recent Concrete Innovations
The word “Green- Concrete” does not refer to the colour of the concrete rather it indicates its environmental -sustainability and eco-friendliness .In general green-concrete is the concrete which reduces carbon dioxide emission, saves energy and majorly consist of non-biodegradable wastes of industries such as fly-ash, rice husk-ash, GGBS(slag) and ferro-chorome ash etc. Firstly as it replaces ordinary portland cement (partially or fully) ultimately carbon dioxide emission is reduced. Secondly most of the industrial wastes are in pulverized form hence energy consumed for production is saved . Thirdly as it utilizes non biodegradable industrial waste, the dumping issues will be solved hence soil and water pollution will be drastically reduced.
Under green concrete various type concretes are included such as:-fly-ash based concrete, rice-husk ash based concrete, slag based concrete and geopolymer concrete. Geopolymer concrete can be termed as fully green-concrete because it replaces OPC totally. concretes is the chemical reaction which forms the binding material. Like other green-concretes hydration reaction doesn’t occur in Geopolymer concrete. Geopolymer concrete is invented by Joseph Davidovits in the year 1978. He proposed that an alkaline liquid can form a binding material by reacting with pozzolanic materials (Geological or Industrial Origin) . The chemical reaction which takes place between pozzolanic material and alkaline liquid is known as polymerization. So he coined the name geopolymer for this concrete. Absence of hydration reaction makes geopolymer concrete a concrete with negligible water content.
The major advantage of geopolymer concrete over any concrete is it totally
The primary difference between geopolymer concrete and other green-replaces OPC which impacts considerably over the energy consumption and global carbon dioxide emission.
Green concrete is invironmently friendly material made from recycled materials to insure a sustainable structure and a long life cycle with a low maintenance surface. e.g. Energy saving, CO2 emissions, waste water.
https://www.quora.com/What-is-green-concrete-where-it-is-used
The word “Green- Concrete” does not refer to the colour of the concrete rather it indicates its environmental -sustainability and eco-friendliness .In general green-concrete is the concrete which reduces carbon dioxide emission, saves energy and majorly consist of non-biodegradable wastes of industries such as fly-ash, rice husk-ash, GGBS(slag) and ferro-chorome ash etc. Firstly as it replaces ordinary portland cement (partially or fully) ultimately carbon dioxide emission is reduced. Secondly most of the industrial wastes are in pulverized form hence energy consumed for production is saved . Thirdly as it utilizes non biodegradable industrial waste, the dumping issues will be solved hence soil and water pollution will be drastically reduced.
Under green concrete various type concretes are included such as:-fly-ash based concrete, rice-husk ash based concrete, slag based concrete and geopolymer concrete. Geopolymer concrete can be termed as fully green-concrete because it replaces OPC totally. concretes is the chemical reaction which forms the binding material. Like other green-concretes hydration reaction doesn’t occur in Geopolymer concrete. Geopolymer concrete is invented by Joseph Davidovits in the year 1978. He proposed that an alkaline liquid can form a binding material by reacting with pozzolanic materials (Geological or Industrial Origin) . The chemical reaction which takes place between pozzolanic material and alkaline liquid is known as polymerization. So he coined the name geopolymer for this concrete. Absence of hydration reaction makes geopolymer concrete a concrete with negligible water content.
The major advantage of geopolymer concrete over any concrete is it totally
The primary difference between geopolymer concrete and other green-replaces OPC which impacts considerably over the energy consumption and global carbon dioxide emission.
Advantages of Geopolymer concrete over normal concrete:-
=>The compressive strength of geopolymer concrete significantly increases with passage of time.
=>The low drying shrinkage and low creep of geopolymer concrete offers long term durability .
=>Geopolymer concrete has excellent resistance to chemical attack and shows promise in the use of aggressive environments where the durability of Portland cement concrete may be of concern .
=>Absence of gypsum in low calcium fly-ash based geopolymer concrete provides a great resistance to the sulfate atta
=>Fire endurance and non-combustibility nature of geopolymer makes it superior to any engineering material for construction, transportation and infrastructure applications. It can sustain more than 800°C of temperature .
There is no such major noticeable disadvantage of Geopolymer concrete, but availability of skilled laborer and required chemicals may be a concern.
Green concrete, first invented in Denmark in 1998, has become a revolutionary theme in the history of the concrete industry. Green concrete is being used to use environmentally friendly cement materials in the sustainable concrete industry,
Recently, Dubai Municipality announced that construction companies and consulting firms will be required to apply the use of environmentally friendly cement materials (green concrete) in the construction of buildings.
Material efficiency is bringing sustainability in the use of materials for construction projects and taking care of increasing scarcity of natural resources.
When green materials are used as ingredients in concrete, they are termed as Green Concrete. The green materials are environmentally responsible materials as they help in reducing environmental impacts.
Green ingredients is the selection of most economical raw materials, using recycling waste to minimize the amount of unutilized material, observing energy conservation and incorporating renewable resources.
Ideal green building material is a material which has no negative environmental impacts.
Possibly it should have positive environmental impacts. Further such material should be infinitely reusable or recyclable. But such ideal materials are rarely available. However materials which can eliminate or reduce negative impacts can be considered as green building materials.
In case of green materials used in concrete, life cycle should not exhibit that any stage the material
· does not emit volatile organic compound (VOC)or emit minimal VOCs
· has low emission of toxic or carcinogenic or irritant chemicals
· free of toxic materials such as chlorine, lead, mercury, arsenic, chromium, cadmium, asbestos, chlorinated polyethylene and chloro sulphonated polyethylene, Chlorofluorocarbons (CFC) , polyvinyl chloride (PVC), halogenated flame retardants, phthalates, creosote, penta- chloro phenol, petrochemical fertilizers and pesticides as well as formaldehyde
· Use of waste material in construction
· Partial replacement of clinker or Portland cement by slag, fly ash, straw, silica fumes.
· Partial replacement of natural materials that require little processing such as pozzolana calcined clay
· Use of rice husk ash in concrete
· Palm oil shell aggregate for light weight concrete
Concrete can recycle fly ash from coal fired plants and slag from the blast furnaces of steel production. But these materials may contain toxins like mercury. The toxins should not be directly exposed to occupants.
My paper recommended by many RG colleagues is appended for rendering further reference.
Green concrete is made of biodegradable and eco-friendly materials
Dr Réagan
#ISTANDWITHELI
Great question
The answers are adequate and I agree with Dr Ankit Desai
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