Global Warming phenomenon is on the increase in the Earth’s temperature, which leads to climatic changes. This is caused by human activities which emit greenhouse gases (GHGs) such as carbon dioxide (CO2), Methane (CH4), nitrous oxIde (N2O), hydofro – fluorocarbons(HFCs), Perfluorocarbons (PFCs) and sulphur hexafluoride (SF6). The usage non-renewable energy has increased the carbon concentration in the atmosphere and has also increased the temperature of Globe. Among all the human activities that emit GHGs construction industry should hold responsibilities too.
In a recent publication by international Panel of Climate Change, it explain that the largest growth in the carbon emissions has come from electricity generation, transport and industry. The construction, operations, heating and cooling of building emits Carbon dioxide and to reduce this emission. Construction of building with energy efficiency or low carbon emission material must be used in the construction Industry. To achieve a building with low or even zero carbon emission, the design and tool used by the building is important and must be energy efficient.
How construction industry contribute to global warming and what efforts have been made in order to reduce global warming by local construction industry to follow the ‘green’ footsteps and government regulations. Global warming has been a growing global concern in recent years. Global warming could lead to greenhouse effects, climate change, rise in mean sea level, acid rain and depletion in ozone layer. Global warming caused by emission of anthro-pogenic greenhouse gases. Among ‘basket’ of GHGs, CO2 plays the most vital role. Due to the developing of each country, it can be seen that the carbon emission has become more serious.
During the 150 years of the industrial age, the atmospheric concentration of CO2 has increased by 31 percent Carbon emission comes from domestic industry, the energy usage to operated in building, embodied energy and construction activities are those which hold awareness, many countries have play an important role to reduce carbon emission, many rules and regulations are Kyoto protocol, Climate Display Energy Certificates and others relevant regulations. Regulations set are mandatory for construction parties to follow and hope that it will reduce carbon emission and save our earth.
Causes of Global warming by Construction Industry
During the lifetime of a building, it required a lot of energy to used in majority of buildings in the whole are using electricity that is sourced mainly from coal power plants. All of our daily activities in a building require usage of energy which generate from power plants especially from coal. Coal releases the most carbon as compared to natural gas and oil power plants.
For example, buildings produce high heat that radiates outside into the air and most buildings are not designed for such high temperature. In order to solve this problem, air- conditioning has been used. The usage of air-conditioning will increase the energy consumption and in the same time the emission of CO2. During winter, buildings required some heating in order to keep the occupant warm. A specific Coal fly ash from the thermal power plants which required a particular physical and chemical properties alone is used as a raw material for manufacturing the green building products helps in saving energy due its high insulation properties; such as low thermal conductivity, fireproof soundproof will help to reduce energy consumption during the lifetime of the buildings in both summer and winter seasons.
By constructing a sustainable building, zero carbon building and the like, emission of carbon by building operation has been reduced. However, the embodied energy in the building materials has been neglected. Embodied energy is the energy used to produce building materials such as cement, Autoclaved Aerated Concrete (AAC) Blocks, Steel, aluminum and other materials. Embodied energy means the non-renewable energy used in the acquisition of raw materials, processing, manufacturing, transportation to site and construction. Besides, energy used to transport building products to the site also considered as embodied energy.
For example, a concrete block that is located near by the site will contain lower embodied energy than a concrete block from distance place. This is because the energy used for transportation of the concrete block is different. Moreover, if a building has high energy efficiency or used less energy. its embodied carbon rating will increased. The less carbon being released through construction of a building, the bigger percentage that embodied carbon contributes to the total carbon footprint.
Eco friendly green building material Autoclaved Aerated Concrete (AAC) block
Eco friendly products promote green living, they help to conserve energy and also prevent air, water and noise pollution. They prove to be a boon for the environment and also prevent human health from deterioration.
Eco friendly Green Products Defined
What is termed as a “green” or “sustainable” often refer with respect to products, service or practices that allow for economic development while conserving for future generations. We prefer to describe a ”green” product as one that has less of an environmental impact or is less detrimental to human health than the traditional product equivalent.
Energy efficient, durable and often have low maintenance requirements. Free of ozone depleting chemicals, toxic compounds and don’t produce toxic by-products. Often made of recycled materials or content or from renewable and sustainable sources.
Obtained from local manufacturers or resources.
Biodegradable or easily reused either in part or totally. Using green building material while constructing the small residential building material while constructing the small residential building, high-rise residential buildings and commercial buildings is the easiest way to make it sustainable The Autoclaved aerated Concrete (AAC) block is made of components that are renewable and environmentally responsible.
Autoclaved Aerated Concrete (AAC)
Autoclaved aerated concrete (AAC) is a derivative of fly ash is combined with cement, lime and water and an aerating agent. AAC is produced as block and panels. It is an approved eco friendly building material that comes from industrial waste and is made from non-toxic ingredients. With AAC, your construction process can be about 20 percent faster. It weighs only about 50 percent of a standard concrete block and possesses high thermal insulation and is acoustics-friendly.it also has better fire resistance than fly ash and is non-combustible. It’s non-allergic and hence maintains the quality of air within a building without changing its properties over time.
Using AAC blocks can low construction cost by about 15%-20% for building and reduce the running costs by to 30% to 40%.
AAC is a highly thermally insulating concrete-based material used for both internal and external construction. Besides ACC’s insulating strength, one of its advantages in construction is its quick and easy installation, because the material can be routed, sanded or cut to size on site using standard carbon steel power tools AAC is well suited for urban area with high-rise buildings and those with high temperature variations. Due to its lower density, high-rise buildings constructed using AAC require less steel and concrete for structural members. With the requirement of mortar for laying of AAC blocks is reduced dew to the lower number of joints. Similarly, the material required for rendering is also lower due to the dimensional accuracy of AAC. The increased thermal efficiency of AAC makes it suitable for use in area with extreme temperatures, as it eliminates the need for separate materials for cding to faster construction and cost savings.
Even though regular cement mortar can be used. most of the buildings erected with AAC materials use thin bed mortar ie: dry readymix mortar, in thickness of around 3mm to 5mm. AAC materials can be coated with a stucco in plaster compound to guard against the elements.
AAC Blocks are produced for more than 90 years, and it offers several significant advantages over other cement construction materials, one of the most important being its lower environmental impact. Improved thermal efficiency reduces the heating and cooling load in buildings. Porous structure allows for superior fire resistance. Workability allows accurate cutting, which minimize the generation of solid waste during use.
Resource efficiency gives it lower environmental impact in all phases of its life cycle, from processing of raw materials to the disposal of waste. Light weight saves cost & energy in transportation, labor expenses and increases chances of survival during seismic activity. Larger size blocks lead to faster masonry work. Reduces the cost of the project.
When used it helps to reduce at least 30 percent of environmental waste as against to going with traditional concrete. There is a decrease of 50 percent of greenhouse gas emissions. Wherever possible, using autoclaved aerated concrete is a better choice for the environment.
It is an excellent property that makes it a good insulator and that means the interior environment is easily maintained, there is no need for any supplementary insulation.
Just like with regular concrete, AAC is fire resistant. This material is completely inorganic and not combustible.
There are no toxic gases or other toxic substances in AAC. It does not attract rodents or other pests nor it can be damaged by such.
Concrete blocks and AAC weighs about one- fifth of typical concrete. They are also produced in sizes that are easy to handle for quick construction.
The panels and blocks made of AAC is made of the exact sizes needed before they even leave the factory. There is need for on-site trimming. Since the blocks and panels fit so well together, there is reduced use of finishing materials such as mortar.
The life of this material extended because it is not affected by harsh climates or extreme changes in weather conditions. It will not degrade under normal climate changes either.
Since it is a lightweight material and easy to work with, the assembly is much quicker and smoother.
The construction industry is full of stories symbolizing the triumph of entrepreneurial spirit backed by technical and business acumen. The story of Methra Industries is a good example. A brainchild of P.Venkatesan, a dynamic technocrat with wide ranging experience in the construction industry, spanning over three decades, the company has become a top name in the field with its Cell O Con AAC Blocks. The other Green products offered by the company include, Cell O Con Green Gypsum Plaster and Cell O Con Dry Mix Mortar, all of which are a result of meticulous research and development.
For further details: