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Practice Question #19:
Panchayati Raj:

તલાટી મંત્રી પંચાયતી રાજ વ્યવસ્થા નો અતિ મહત્વ નો પાયો છે. તેની કામગીરી સંદર્ભે ચર્ચા કરો.

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GPSC Calendar 2022

Mnemonics એટલે શું?
કોઈ વસ્તુ યાદ રાખવા માટે બનાવેલું વાક્ય.
માર્ચ મહિના ના મહત્વૂર્ણ દિવસો યાદ રાખવા માટેનું mnemonic.

Practice question #20
Economics:

શું Gujarat IT Policy 2022 ગુજરાત માં IT ક્ષેત્ર માં નવી ક્રાંતિ લાવી શકશે? ચર્ચા કરો.

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Gujarat IT Policy

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શું જિંદગી એટલે માત્ર જલસા?...
એ જલસા માં પણ મજા ન આવે તો શું કરવું?
How to motivate youth to do something for society?

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Surat gets India’s first steel slag road: What is it, how is it different from regular ones?

Surat has become the first city in the country to get a processed steel slag (industrial waste) road built as part of a joint-venture project by the Council of Scientific and Industrial Research (CSIR), Central Road Research Institute (CRRI), Union Ministry of Steel, government think-tank NITI Ayog, and ArcelorMtttal-Nippon Steel (AM/NS), at Hazira. What is so special about this project and how is it different from regular roads? We explain.

What is the project all about?

The six-lane public road is a kilometre-long stretch in Hazira industries, which also houses the AM/NS plant. The construction began around a year ago by converting mounds of steel waste into steel slag aggregate. The sixth and final lane of the road, with a three-lane to-and-fro carriageway on either side, was completed in early March. The road is now being used by heavy-duty vehicles of multinationals located in the industrial estate on the outskirts of Surat.

According to CRRI principal scientist Satish Pandey, the construction cost of the processed steel slag road is 30 per cent cheaper than roads built from natural aggregates. “The thickness of the road is also 30 per cent lesser than normal ones, while the durability is much longer due to the utilisation of steel slag,” Pandey added. This project falls under the initiative of the Waste to Wealth and Clean India Campaign.

The slag is generated from a steel furnace burning at around 1,500-1,600 degree centigrade in the form of molten flux material as an impurity. The molten material is poured into the slag pits for cooling as per the customized procedure and further processed to develop stable steel slag aggregates, with “better material properties in place of the natural aggregate commonly used in road constructions”, Pandey said.

According to the Indian Road Congress guidelines for construction of a heavy traffic road that is capable of taking the load of 1,000 to 1,200 trucks per day, around 600 to 700 mm thickness of road layers are required on the foundation with 8 per cent CBR (California Bearing Ratio). According to Pandey, in comparison to normal highways, the ones made out of steel slag are 30 per cent less thick because of better material characteristics. “The construction costs of such steel slag roads will also be around 30 per cent cheaper. The Hazira road uses around 1 lakh tons of processed steel slag.”

The CRRI will now prepare guidelines and specifications for the utilisation of steel slag in road construction. “The parameters and performance indicators will be incorporated in the road guidelines and will be given to Indian Road Congress, Ministry of Roads and Highways, to utilise steel slag for the constructions of national highways,” Pandey informed.

The load-test
Over 30 heavy-loaded trucks use the carriageway on a daily basis. The steel slag road, which is also part of a research study, has been constructed using instrumented test sections, comprising strain gauges, pressure cells, displacement gauges and thermocouples to measure load-induced deformation, and stress and strain in the pavement areas. “We are also monitoring the temperature variation in the pavement layer using thermocouples,” says Pandey, while adding that CSIR CRRI will further monitor its performance for another one year.

Why has it been done at Hazira?
Sources said that the Hazira road in Surat was chosen because of the proximity to the AM/NS steel plant and the availability of heavy traffic on the road for study purposes. This stretch was already in a dilapidated condition and is now re-built using the processed slag aggregates as per the riding standard of a goods highway. Experts have said that these roads are also much more durable during the monsoon. AM/NS produces around 2 million tons of steel slag annually which can be utilised for the construction of roads.

Are these roads cost-effective and good for the environment?

Surat Municipal Corporation (SMC) Road Development department officials say the utilisation of processed steel slag in road construction paves the way for sustainable use of waste and reduces the reliance on perishable natural aggregates. This process is also expected to reduce GHG emissions and carbon footprint in road construction activity and is in line with India’s commitment to the United Nations Sustainable Development Goal No. 9 for building resilient infrastructure through inclusive and sustainable industrialization and green technologies.

Executive Engineer at SMC’s Road Development Department, B R Bhatt, said: “The approximate construction cost per square meter of a processed steel slag road is Rs 1,150 as against Rs 1,300 for a bitumen road and Rs 2,700 for a cement or a concrete one. The lifespan of a cement or concrete road is over 30 years while that of bitumen and steel slag road is around 15 years.”

Do high temperatures affect these roads?
According to Bhatt, the upper surface of the road will be around “1-2 degree higher in mid-afternoon when compared to regular ones”. Thermocouple has been used to maintain the temperature of the outer surface of the road.

However, the carbon footprint for such roads is much lower as the ones built using natural aggregates are mined and processed. Besides, after mining and crushing, the material also needs to be transported from one place to another. When it comes to steel slag road, there is no blasting, drilling or crushing as the material is waste coming out of a steel industry which is processed and converted to the form of aggregate material used for construction. “The utilisation of waste steel slag for road constructions reduces pollution created by heaps of waste dumped nearby. The particles of steel waste also get into the air and even seep into the ground, reaching the underground water table,” Bhatt explained.

Coming to the impact of such roads on the vehicles, experts said that the effect on tyres would be negligible. “The steel slag melts at over 200 degree Celsius, while the temperature during peak summer in India is not above 45 degree Celsius. Moreover, the upper layer is made up of bitumen layers,” Bhatt added.

Courtesy: IE

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JJ Tutorials GPSC #Mains Series lecture 11
કારણ કે mains ની season આવી ગઈ છે...

GPSC Class 1 2 Mains Paper Solution
July 2021 GS 1 History Art Culture Geography

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