07-05-2011, 11:02 AM
PRESENTED BY:
Subhash Chandra
subhash-chandra-sr-engineer ntpc use of fly ash in different countries.ppt (Size: 2.98 MB / Downloads: 883)
Use of Fly Ash in Dam Construction
1. India
2. Japan
3. Malaysia
4. Other
1. India
The Ghataghar Dams Project is located on the boundary of the Thane and Ahamadnagar districts of the Maharashtra State.
Three dams have been constructed: the Upper Dam, the Lower Dam and the Saddle Dam.
Country's first RCC (roller compacted concrete) dams.
Roller Compacted Concrete
• It is named from the method used for construction.
• It is a zero slump concrete having same basic ingredients
• It is transported by dump trucks, spread by dozers and compacted by vibratory rollers.
• The main contractor for the roller compacted concrete dam work is Patel Engineering Ltd of Jogeshwari, Mumbai.
• 250 MW Ghatghar Hydro Electric Pumped Storage Scheme
• First time, the Ghatghar project used 60 per cent fly ash in the mixture.
• The results were better than expected. Then the fly ash proportion was increased to 70 per cent.
• The concreting of the main Roller Compacted Concrete (RCC) dam started in December 2004 and completed in June 2006.
• A total of 6,43,000 cum. of RCC was placed in 12 working months at approx. speed of 54,000 cum per month.
• The Ghatghar RCC Dam is among the top 10 fastest RCC dam completed in the world.
2. Japan
In Japan, production of fly ash in 2006 was 11 million tons
And 10.7 million tons (97.2%) was used
RCC Dam - in Japan, usually used “RCD”)
This technique was first applied at Ohkawa Dam in 1976
Fly ash replaced from 20 to 30 %
The content of the cement and fly ash for RCD was 120 kg/m3
The rate of construction by RCD method is similar to that of RCC method in USA or China
It was realized that the reduction of 9 % of construction cost and 13 % of construction period
Shimajigawa Dam in 1980
Tamagawa Dam in 1987
Initially thickness was kept 500 mm for 1 lift.
Then the thickness of 1 lift becomes 750 mm in 1990
Recently 1,000 mm on the economical viewpoint
3. Indonesia
The Sg. Kinta Dam located approximately 12 km of north east of Ipoh City
It was part of water supply scheme and completed in March 2006
The Dam at a height of 85m was the 1st RCC Dam in Malaysia
The mix was prepared - contained 100kg of a portland cement and 100kg of fly ash per cubic metre of RCC.
The Sg. Kinta Dam consumed about 100,000 tonnes of fly ash