Question

In: Civil Engineering

Use of fly-ash for the production of concrete in hot weather.?

Use of fly-ash for the production of concrete in hot weather.?

Solutions

Expert Solution

Basically fly ash is by-product left from burning coal which is collected in electrical generating station or baghouse. Using of fly ash in concrete has many good results and also improves concrete performance in both the fresh and hardened condition.

Use of Fly Ash for concrete in hot weather -

  • Increases Workability- Fly ash provides lubricant effect in the concrete thus increasing the workability of the concrete.
  • Decreases water demand- Fly ash reduces water requirements by 2 to 10 percent .
  • Setting time - Concrete will set slowly when fly ash is used.
  • Early-age strength- Initially fly ash affects the strength of concrete so its better reducing fly ash content.
  • Long-term strength - Decrease in water use leads to to gain strength over the period of time.
  • Increases Pumpability - Fly ash tends to reduction in frictional losses while pumping concrete.
  • Reduces heat of hydration- Replacing of cement with fly-ash in the concrete reduce the heat of hydration of concrete .
  • Improves Placeability and Finishability - Fly ash allows concrete to move more fluidly which makes it easy for placing and finishing processes.
  • Reduces permeability - The reduction in water use and development of additional cementitious compounds tends to decrease pore interconnectivity of concrete, thus reducing in permeability.
  • Improves durability- Fly ash use increases in cementitious compounds with reduction in permeability ultimately resulting in improved durability.
  • Decreases resistance to carbonation- Fly ash use in concrete reduces its resistance to carbonation.
  • Improves sulfate resistance- Sulfate resistance is increased by use of F-class fly ash in concrete.

Summary- Basically fly ash is by-product left from burning coal which is collected in electrical generating station. Fly ash allows concrete to move more fluidly which makes it easy for placing and finishing processes.


Related Solutions

write an article on application of Fly ash( silica fume) in concrete.
write an article on application of Fly ash( silica fume) in concrete.
I research about "ENHANCEMENT OF CONCRETE PROPERTIES COMPRISING SILICA FUME AND FLY ASH'' . Can you...
I research about "ENHANCEMENT OF CONCRETE PROPERTIES COMPRISING SILICA FUME AND FLY ASH'' . Can you write discussion research about that title please?
I research about ''ENHANCEMENT OF CONCRETE PROPERTIES COMPRISING SILICA FUME AND FLY ASH'' Can you write...
I research about ''ENHANCEMENT OF CONCRETE PROPERTIES COMPRISING SILICA FUME AND FLY ASH'' Can you write an introduction about that title?
I have research project about "''ENHANCEMENT OF CONCRETE PROPERTIES COMPRISING SILICA FUME AND FLY ASH'' Can...
I have research project about "''ENHANCEMENT OF CONCRETE PROPERTIES COMPRISING SILICA FUME AND FLY ASH'' Can you write an abstract about that title please? thanks
During September 2020, due to the very hot weather, the production of tomatoes in the local...
During September 2020, due to the very hot weather, the production of tomatoes in the local market in Gaza decreased by 60%. Explain the effect of this factor on the market equilibrium of tomatoes ? using graph Due to the financial crisis the income of government's employees has decreased by 50%, at the same time the number of frozen meat's sellers increased by 20%. Explain the effects of these changes on the market equilibrium of frozen meat? Using graph? During...
7) LIST AND EXPLAIN THE USE, ADVANTAGES and DISADVANTAGES OF: a) Type "F" Fly-Ash b) Slag...
7) LIST AND EXPLAIN THE USE, ADVANTAGES and DISADVANTAGES OF: a) Type "F" Fly-Ash b) Slag Cement c) Type "C" Fly-Ash d) Silica Fume
What is the effect of fly ash when it partially replaced with cement and how it...
What is the effect of fly ash when it partially replaced with cement and how it will affect the following properties: 1. Workability 2. Compressive strength 3. Flexural strength 4. Hardness 5. Moisture content 6. Hardened density Please I want to know if the properties above will increase or decrease when the fly ash is partially replaced with cement and why?
In a study of pulverized fuel-ash concrete mix, it was found that the sample mean compressive...
In a study of pulverized fuel-ash concrete mix, it was found that the sample mean compressive strength was 27.0 with a standard deviation of 4.89 for a sample of 68 specimens which had been aged for 7 days. A sample of 74 specimens which had been aged for 28 days yielded a mean compressive strength of 35.8 with standard deviation 6.43. Is there strong evidence that mean compressive strength is higher after 28 days than after 7 days? Yes, because...
7.21 The Weather Channel reports that it is a hot, muggy day with an air temperature...
7.21 The Weather Channel reports that it is a hot, muggy day with an air temperature of 90°F, a 10 mph breeze out of the southwest, and bright sunshine with a solar insolation of 400 W/m2. Consider the wall of a metal building over which the prevailing wind blows. The length of the wall in the wind direction is 10 m, and the emissivity is 0.93. Assume that all the solar irradiation is absorbed, that the surroundings are at Tsur...
Electrostatic precipitator question, I'm designing an electrostatic precipitator (ESP) to capture the particulate matter(fly ash) from...
Electrostatic precipitator question, I'm designing an electrostatic precipitator (ESP) to capture the particulate matter(fly ash) from flue gas at 130C that exits from a coal-fired power plant. My question is: how can i increase the efficiency of the electrostatic precepitator without conditioning the flue gas (ie. injecting so3 or ammonia or water)? what are the alternative ways to increase the efficiency of the ESP? please show references with solution. Thanks
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT