Adding Fly Ash to Concrete
1. Using fly ash in concrete means we need less concrete. Concrete production is a major cause of greenhouse gas emissions. 2. Using fly ash in concrete reduces the disposal needs of power plant waste.
What is fly ash? Power plants that burn coal account for more than half of the electricity produced in the United States . These power plants also produce residual materials like fly ash (which is captured from the exhaust of the boiler) and bottom ash (which is heavier and falls to the bottom of the boiler). These and other “coal combustion products” were originally treated as waste and disposed of in landfills.
Performance of Fly Ash Concrete
Environmental Benefits of Using Concrete.
Additionally, recent studies conducted by the Environmental Council of Concrete Organizations have determined certain metropolitan areas experience higher overall temperatures than surrounding less-developed areas. Using lighter colored concrete products instead of asphalt pavement can help reduce excessive temperature, further conserving energy
Pumper truck arrives 7:30am. First cement truck arrives 8:00am.
Ready to pour. The driver controls the cement truck from inside his cab.
The pumper truck, hopper, & cement flow is controlled from the operator
inside the dome.
A "slurry" mix of water & concrete is pumped through the hose to get
started - then the action begins.
The pump actually shoots the concrete out 8'-10'.
A laser beam with a remote sensor on the rod is used to check the
height of the concrete.
A power screed is used to level the first time.
Work progresses quickly while the crowd looks on.
"Zip strip" control joints are placed to control drying cracks.
The total pour involves approximately 2100 SQ. FT. With footings the
total is 40 cubic yards.
The final few yards are poured directly from the truck chute. Sam's
Masonry workers back themselves out the door at 10:15am. Without
the pumper truck, they would still be wheelbarrowing concrete.
Now we wait a few hours.
The entire slab was finished with a circular power trowel and then hand
troweled because we are going to stain the concrete as the final floor
finish in all the rooms.
Anyone for roller skating? We had to scratch the proverbial
dedication into the concrete as the final step.
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