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13/04/2010

Railways experiment with cost-effective fly ash sleepers

Railways experiment with cost-effective fly ash sleepers

The Research, Design and Standards Organisation (RDSO) of Indian Railways is experimenting with cost-effective sleepers for railway tracks. At present, railway sleepers are made with cement concrete. Now, the RDSO, in collaboration with IIT-Kanpur and NTPC, is planning to use fly ash in the sleepers, which will not only make them more durable, but also cost effective. An initiative of NTPC, the project was undertaken by RDSO in January 2010, and the sleepers will undergo lab tests in the next three months before going for field trials.

Fly ash is a residue of coal-based thermal power plants and is generally considered a waste. However, it is known to acquire cement-like properties when mixed with lime and water because of its pozzolanic characteristics, said V K Mathur, Head of Ash Utilisation Division, NTPC.

India produces 150 million ton fly ash every year and by 2012, the production is expected to reach 200 million tons. Mixing 25 to 30 per cent of fly ash gives 20 per cent more durability to the cement structure as the fly ash particles, being smaller in size than the cement particles, settle in the smallest of voids in a cement structure and make the structure more condense, Mathur told The Indian Express.

He was in town to participate in the two-day UIC Asia Workshop on Optimisation of Pre-stressed Concrete Sleepers organised by the International Union of Railways in collaboration with RDSO. This is the first time that railways organised an international workshop in Lucknow and more than 80 delegates from across the country, as well as from Germany and Australia, participated in it.

“We produce around one crore sleepers every year and if the experiment is successful, it will reduce the cost of production of each sleeper by approximately Rs 30, which will mean an overall cost saving of Rs 30 to 35 crore per annum for India Railways,” said A K Singhal, Executive Director (Track), RDSO.

“In the long run, this will also gain carbon credits for RDSO as it will reduce 0.15 million tons emission of carbon dioxide per annum,” Mathur said. Fly ash is also expected to reduce lime requirements in the process by 0.15 million tons, he added.

“The lab tests on sleepers made of 30 per cent fly ash is being done in IIT-Kanpur and if all goes well, we will be ready for its field trial in the next three months. The first trials on main track will be done in the vicinity of RDSO, Lucknow,” said Singhal.

http://www.indianexpress.com/news/railways-experiment-with-costeffective-fly-ash-sleepers/600589/0

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PME Due Date

Master Circular No. 25



Copy of Railway Board’s letter No. 69/H/3/11 dated 06.12.1974



Subject: Implementation of the Recommendations of the Visual Sub-Committee.



6. Periodical re-examination of serving Railway Employees:



6.l. In order to ensure the continued ability of Railway employees in Classes A l, A 2, A 3, B l and B 2 to discharge their duties with safety, they will be required to appear for re-examination at the following stated intervals throughout their service as indicated below:



6.1.1. Classes A l, A 2 and A 3 —At the termination of every period of three years, calculated from the date of appointment until they attain the age of 45 years, and thereafter annually until the conclusion of their service.



Note: (l) The staff in categories A l, A 2 and A 3 should be sent for special medical examination in the interest of safety under the following circumstances unless they have been under the treatment of a Railway Medical Officer.



(a) Having undergone any treatment or operation for eye trouble irrespective of the duration of sickness.



(b) Absence from duty for a period in excess of 90 days.



(2) If any employee in medical category A has been periodically medically examined at any time within one year prior to his attaining the age of 45, his next medical examination should be held one year from the due date of the last medical examination and subsequent medical examination annually thereafter.



If, however, such an employee has been medically examined, at any time earlier, than one year prior to his attaining the age of 45, his next medical examination should be held on the date he attains the age of 45 and subsequent medical examination annually thereafter.




Ammendment: It was ammended in 1993 as below



Age Group PME Due



Age 00-45 every 4yrs



Age 45-55 every 2yrs



Age 55-60 every year
Details:-
As per Rly Bd's Guideline of Medical Exam issued vide LNo. 88/H/5/12 dated 24-01-1993

a) PME would be done at the termination of every period of 4 years from date of appointment / Initial medical Exam till the date of attainment of age of 45 years, every 2 years upto 55 years & there after annual till retirement.
b) Employees who has been periodically examined at any time within 2years prior to his attaining the age of 45years would be examined after 2years from the date of last PME & subsequent PME for every 2years upto 55years age.Of

NRMU 4 you
SMLokhande





6.1.2. Classes B-1 and B-2—On attaining the age of 45 years, and thereafter at the termination of every period of five years.