STRENGTHENING OF STRUCTURE

1. By
A .ANANDHARAJ 622717418001
N.G.SARAVANAN 622717418015
P.SELVA GANESH 622717418017
B.SHANMUGAM 622717418018
6227- SRG ENGINEERING COLLEGE, NAMMAKKAL

2.  Partially replace the cement in concrete
Ex: HIGH VOLUME FLYASH CONCRETE
 Develop alternativematerial
Ex: Geopolymer concrete

3.  Portland cement production is a major contributor to
CO2 emissionsas an estimated 5 TO 8 %of all human-
generated atmospheric CO2 worldwide comes from
the concreteindustry.
 Production of Portland cement is currentlytopping 2.6
billion tons per year worldwide and growing at 5
percentannually.

4.  Geopolymerconcrete has the potential tosubstantially
curb CO2emissions
 producea moredurable infrastructurecapableof
design life measured in hundreds ofyears
 conserve hundreds of thousands of acrescurrently
used fordisposal of coal combustion products
 protectaquifersand surface bodiesof fresh watervia
theeliminationof fly ash disposal sites.

5. OPC vs GEO POLYMER
Geopolymer concrete (GPC) using “fly
ash”
Greater corrosion resistance,
Substantially higher fireresistance (up to
2400° F),
High compressive and tensilestrengths
Rapid strength gain, andlower
shrinkage.
Greenhouse gas reduction potential as
muchas 90 percent when compared with
opc.

6.  Hardened cementationspaste made from flyash and
alkalinesolution.
 Combineswasteproducts intouseful product.
 Setting mechanism depends onpolymerization.
 Curing temp is between 60-90degree.

7.  Source materials:
Alumina-silicate
 Alkaline liquids
combination of sodium hydroxide (NaOH) or
potassium hydroxide (KOH) and sodium silicateor
potassiumsilicate.

9. Geopolymerisation
Storage
Aggregate
Flyash
Alkaline activator
NaOH + Na Silicate

10.  Alkalinesolutions induce the Si and Al atoms in the
source materials ,example fly ash , todissolve.
 Gel formation is assisted by applyingheat.
 Gel binds the aggregates ,and the unreactedsource
material to form the Geopolymerconcrete.

13. . Pan Mixer Used in the Manufacture of Geopolymer
Concrete

14. Addition of Liquid Component

15. Fresh Geopolymer Concrete Ready forPlacing

16. Slump Measurement of Fresh Geopolymer Concrete

18.  Cutting the world’scarbon.
 The price of flyash is low.
 Better compressivestrength.
 Fire proof
 Low permeability.
 Eco-friendly.
 Excellent propertieswithin both acid and salt
environments.

19.  Pre-castconcrete products like railwaysleepers,
electric power poles, parking tilesetc.
 Marine structuresdue toresistanceagainst chemical
attacks
 Waste containments( flyash)
 FUTURE use IN MAJOR PROJECTS

20. IN FUTURE

21. IN FUTURE

22. • Different sourcematerials
• Properties of solublesilicate
• Contaminants
• Industry regulations
• New material
• Lack of awareness.

23. The compressive strengthof GEOPOLYMER concrete is
about 1.5 times more than that of the compressive
strengthwith theordinary Portland cementconcrete,
for the samemix.
 Similarlythe Geopolymer Concreteshowed good
workability as of the ordinary Portland Cement
Concrete.

27.  Non toxic, bleed free
 Sets at roomtemperature
 Long working life beforestiffening
 Impermeable
 Higher resistance to heat and resistall inorganic
solvents
 Higher compressivestrength

28.  Theexposureof thegeopolymers materials to the NaCl
solution resulted in the consistent increase in the
compressive strength during the whole period of
measurement (720 days) and thevalueswereas high as
70 Mpa
 Almost nocorrosion productscould be found on the
surface of thegeopolymer

29. A GEOPOLYMERS mortarafter the 1.5-yearexposure to the
solutions of NaCl

33. The reduced CO2 emissions of Geopolymer cements make thema
good alternative to Ordinary Portland Cement.
Produces a substance that iscomparable toor better than
traditional cements with respect to mostproperties.
Geopolymerconcrete has excellent propertieswithin both acid
and saltenvironments
Low-calcium fly ash-based geopolymer concrete has excellent
compressivestrength and is suitable for Structural applications.

34. THANK YOU ALL