high strength p100 super fine fly ash -...
TRANSCRIPT
![Page 1: High Strength P100 Super Fine Fly Ash - iepkarachi.org.pkiepkarachi.org.pk/Downloads/construction/Hasan AkhtarFly ash... · High Calcium (CaO) ... • Fly ash in concrete provides](https://reader031.vdocuments.mx/reader031/viewer/2022030413/5a9ec53a7f8b9a7f178bcdff/html5/thumbnails/1.jpg)
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Agenda
Source
Quality
Benefits
Projects
Applications
Conclusions
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Source
Upcoming Coal Fired Power Plants Station Location Capacity (MW) Status
Jamshoro Coal Power
Project Jamshoro, Sindh 600 Under construction. Dawn, 27 Feb 2015
KE Coal Power Plant Karachi, Sindh 660 Under construction.
HUBCO-II Hub, Balochistan 1200 Under construction by GEDC
Sindh Engro Thar Coal
Power Project Tharparkar, Sindh 1200 Under construction.
Fauji Fertilizer Power Port Qasim 118 Applied for License December 2014
Sahiwal Coal Power
Project Sahiwal, Punjab 1320
Under construction, May 2014. To be
completed by 2016. Dawn, 27 Feb 15
Port Qasim Electric
Power Co. (Sinohydro)
Port Qasim,
Karachi, Sindh 1200
Under construction, May 2014, China's
Power & Qatar's Al-Mirqab Group JV.
Thar Coal Power Plant Tharparkar, Sindh 660 Proposed
6,898 MW to generate 5.2 million ton of fly ash/year (@ 750 MT / MW)
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K-Electric Bin Qasim TPS
Source
Coal fired power plant
generate Fly Ash (flue
ash).
Fly ash is fine particles
that rise with flue gases.
Fly ash is captured by
electrostatic
precipitators or filter bag
Unit 3 & 4 Planned to be Converted From Furnace Oil to Coal Fired
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Fly Ash Parameters
• LOI is a measurement of unburned carbon (coal) remaining in the ash.
• Fineness of fly ash is defined as the percent by weight of the material retained on the 0.044 mm (No. 325) sieve.
• Chemical composition of fly ash relates directly to the mineral chemistry of the parent coal.
• Uniformity of fly ash characteristics from shipment to shipment is imperative in order to supply a consistent product.
Quality
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Fly Ash Standards
Sample Oxide Analyses of Ash and Portland Cement
Compounds Fly Ash Class F Fly Ash Class C Portland Cement
SiO2 55 40 23
Al203 26 17 4
Fe2O3 7 6 2
CaO (Lime) 9 24 64
MgO 2 5 2
SO3 1 3 2
ASTM C-618 & AASHTO M 295
Quality
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Types of Fly Ash
Hydraulic in Nature with
High Calcium (CaO)
Pozzolanic in Nature
with Low Calcium (CaO)
Quality
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Fly Ash - An Engineering Material
Fly ash improves three important properties in
concrete:
1. Workability
2. Strength
3. Durability
Fly Ash Concrete suitable for concrete structures
built in coastal and marine environment with
exposure to severe environment.
Benefits
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Workability
• Fly Ash aka mineral
admixture gives
workability, reducing
honey combing and
segregation.
• Concrete requires less
water.
• Improve finish
including fair face
concrete.
Benefits
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Concrete Strength
Benefits
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Concrete Durability
Swimming Pool
Benefits
DHA Golf Club
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Crack most likely due to steel corrosion
Benefits
Concrete Durability
DHA Golf Club
Overflow Wall
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Free lime accumulation on overflow wall
Benefits
Concrete Durability
DHA Golf Club
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Close up of free lime accumulation
Benefits
Concrete Durability
DHA Golf Club
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Durability-Reducing Free Lime
• Fly ash in concrete provides Chloride & Sulfate Resistance not
available in SR Cement.
• Make durable concrete (resistance to rebar corrosion and
permeability).
Benefits
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Advantages
• Ease of Pumping
• Reduced Bleeding
• Decrease Permeability
• Reduced Heat of
Hydration
More Benefits of Fly Ash Concrete
• Improved Finishing
• Reduced Efflorescence
• Reduced Shrinkage
• Reduced Alkali Silica
Reactivity
Benefits
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Projects
Darawat Dam
Projects
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Projects Projects
Qasim International Container Terminal, Port Qasim, Karachi
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Projects Projects
Gwadar Port
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Projects Projects
Dubai Marina Kuwait: Boubyan Bridge
Nepal Middle Marsyangdi Hydroelectric
Project
Duqm Seaport, Oman
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Projects
KASB Head Office, Block 2, Clifton, Karachi
Projects
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High Strength Concrete with Fly Ash
Projects
Burj Khalifa, Dubai
New Doha International Airport, Qatar World Trade Center, Bahrain
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Where is Fly Ash used?
• Flowable Fill
• Marine Concrete
Structures
• Concrete Pile
• Basement &
Retaining Wall
• Fair Face Concrete
• Plaster Works
• Road Base/Sub-base
• Reclamation of low
lying area
• Waste Stabilization /
Solidification
• Water Retaining
Structure
• Sewage Systems
including Tanks &
Treatment Plants
Application
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Flowable Fill
• Mixture of coal fly ash, water, and Portland
cement that flows like a liquid, sets up like a
solid, is self-leveling, and requires no
compaction or vibration to achieve maximum
density.
• Designed to function in the place of
conventional backfill materials such as soil,
sand, or gravel and to alleviate problems and
restrictions generally associated with the
placement of these materials.
Application
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Benefits of Flowable Fill
• Allows placement in any weather conditions
• 100 percent density with no compactive effort
• Fills around/under structures inaccessible to conventional fill placement techniques
• Increases soil-bearing capacities
• Prevents post-fill settlement problems
• Increases the speed of backfilling operations
• Decreases the variability in the density of the backfilled materials
Application
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Back Filling with Flowable Fill
Application
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Conclusions
1. Increasing life of concrete roads and structures by improving concrete durability
2. Net reduction in energy use and greenhouse gas and other adverse air emissions when fly ash is used to replace or displace manufactured cement
3. Reduction in amount of coal combustion products that must be disposed in landfills
4. Conservation of other natural resources and materials.
The Way Forward for Pakistan
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Green Business
Conclusions
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