METHOD OF CURING OF CONCRETE. ADVANCE CURING METHODS. CURING OF CONCRETE. CURING DURATION. IS CODE. CURING CONDITION.

1. Department of Civil Engineering
SELF-CURING CONCRETE
Presentation Submitted By,
Porus Rana
Ranjan Kumar Lal
Akash
Lekh Raj
Naveen kumar
Under the guidance of: Prof. Vikas Kataria

2. Department of Civil Engineering
INTRODUCTION
❑Construction industry is growing like day by day even in remote areas
and desert regions also.
❑Even India and other countries are facing lot of problems in supplying
drinking water to their citizens.
❑Hence, Construction industries are under pressure in finding out
alternative curing methods for Curing of Concrete.

3. ❏ Self Curing Concrete is the one which can meet the present and
future requirement of Curing Concrete.
❏ As a result successful and recent test and research, have recently put
external self curing in the forefront of the breakthrough of ideas of
how to make better concrete.

4. Department of Civil Engineering
Definition Of Curing
❖As Per IS 456:2000
“Curing is the process of preventing the loss of moisture from the Concrete”
❖As Per ACI-308R
“The Term “CURING” is frequently used to describe the process by which hydraulic-
cement Concrete matures and develops hardened properties over a time as a result of the
continued hydration of the cement in the presence of sufficient water and heat.”

5. Department of Civil Engineering
SELF-CURING CONCRETE???
❖Self-Curing Concrete is the one which can cure itself by retaining its
moisture content.
❖Concrete in which the mixed water is restricted to evaporate by means
of some chemical compounds, to go out from concrete is known as
“SELF-CURING CONCRETE”
❖A Concrete can be made to self cure either by adding curing admixtures
or by the application of curing compounds

6. ● 2C3S + 6H2O → C3S2H3 + 3Ca(OH)2
100 + 24 → 75 + 49
● 2C2S + 4H2O → C3S2H3 + Ca(OH)2
100 + 21 → 99 + 22
• C3S requires 24% and C2S requires 21% of water by wt. of cement. It has been
estimated that avg. 23% is required for complete chemical reaction.
• It has been also estimated that about 15% water by wt. of cement is required to fill
up the gel pores.
• So total 38% of water is required by wt. of cement for complete hydration process.
Hydration of Concrete

7. Factors Affecting curing
Environmental conditions
The longer the curing process, the greater likelihood of reaching the design strength.
Not incorporating plans for providing the best finishing and curing at the time of your work
may prove costly if winter weather comes early.
Aesthetic requirements
Concrete can be cured through the use of water and various chemicals called curing
compounds/sealers (we’ll discuss the properties of each in part two of this article). Certain
curing practices can affect the appearance and wear resistance of the finished concrete.
This surmountable curb was cured in fall 2013 and suffered from the
harsh winter; scaling and pop-outs are apparent

8. Timing
Curing should take place immediately after concrete is placed and finished; not
hours later, and certainly not on the following day.
It is critical for early-age concrete to be subjected to moisture and temperatures
above 50 degrees Fahrenheit for appropriate strength gain
If the concrete dries out or temperatures dip to near freezing, its strength and
durability can be compromised.

9. Department of Civil Engineering
Why Self-Curing Concrete??
❑Sometimes Work are carried out in place
where there is acute shortage of water and
the application of water curing is not
possible for reasons of economy.
❑Prevention of moisture loss from the
surface of flat concrete works such as
highways and airports have been
challenging task for construction works.

10. Department of Civil Engineering
❑If the evaporation of moisture from
concrete are not prevented properly it may
result in Plastic Shrinkage Cracks, poorly
formed hydrated products, finishing
problems and other surface defects
❑Sometimes concrete is placed in some
inaccessible, difficult or far places,
where curing cannot be properly done
or supervised.
Why Self-Curing Concrete??

11. Department of Civil Engineering
Methods of Self-Curing
➢ EXTERNAL SELF-CURING OF CONCRETE
➢ INTERNAL SELF-CURING OF CONCRETE
EXTERNAL SELF-CURING
❑External Self-curing concrete is the one which can cure itself by retaining its
moisture content within the concrete by the application of curing compound on
the surface of the concrete.
❑Example:-Curing Compounds

12. Department of Civil Engineering
Methods of Self-Curing
INTERNAL SELF-CURING
❑Internal Self-curing concrete is the one which can cure itself by retaining its
moisture content within the concrete by adding some admixture at the time of
concrete mix design(Manufacturing of Concrete at RMC Plants)
❑Example:-Admixtures, Chemical Compounds

13. Department of Civil Engineering
Difference B/W INSCC & ENSCC
EXTERNAL SELF-CURING
INTERNAL SELF-CURING
❑ Curing compounds available are Wax based,
Resin based and Water based. The curing
compound applied on concrete acts as a
protective layer and seals the moisture
content with in the concrete.
❑ Example:- The curing compounds available as
CONCURE WB, CONCURE LP90 etc….
❑ Hence its use in all type of Concrete
Structure works. (RCC & PCC)
❑ Various Admixtures used as Concure WB, Conplast NC,
Conplast CN and Conplast SD110 etc..
❑ Rheocure is the curing admixture used in various
construction work in UK for plane concreting(PCC).
This admixture used for curing concrete contains certain
amount of chloride which leads to corrosion of
reinforcement.
❑ Hence its use is restricted only with in Plain
Concrete(PCC)

14. Department of Civil Engineering
Internal Curing of Concrete
Due to difference in chemical potential between the vapor and liquid phases, continuous evaporation of
moisture takes place from external surface of concrete. The polymers added to the concrete mix mainly form
hydrogen bonds with water molecules and reduce the chemical potential of the molecules which results in
reduction of the vapor pressure, thus reducing the rate of evaporation from the surface.
Contrivance of Self-Curing:
Potential Materials for Self-Curing (Internal) Curing:
● Lightweight Aggregate (natural and synthetic, expanded shale)
● Super-absorbent Polymers (SAP) (60-300 nm size)
● SRA (Shrinkage Reducing Admixture) (propylene glycol type i.e.
Polyethylene-glycol)

15. Department of Civil Engineering
Polyethylene Glycol
● Polyethylene glycol is a condensation polymer of ethylene
oxide and water with the general formula H(OCH2CH2)nOH,
where n is the average number of repeating oxyethylene
groups typically from 4 to about 180.
● The abbreviation (PEG) is termed in combination with a
numeric suffix which indicates the average molecular
weights.
● One common feature of PEG appears to be the water-soluble
nature.
● Polyethylene glycol is non toxic, odourless, neutral,
lubricating and non-volatile.

16. Department of Civil Engineering
Experimental Study on Strength
Properties of Self Curing Concrete by
Using Poly Ethylene Glycol as Self Curing
Agent

17. Department of Civil Engineering
Methodology
❏ Determination of Material Properties
Cement – Specific Gravity, Standard consistency, initial setting time, Final setting time
Fine Aggregates – Sieve analysis, Specific gravity, water content and water absorption, , Bulk
density and Percentage voids
Coarse Aggregates – Sieve analysis, Specific gravity, water absorption, Bulk density and
Percentage voids,
Super Plasticizer – Master Glenium SKY 8233
Water
❏ Mix Proportioning (M30 and M40)
❏ Mix Preparation And Specimen Preparation
❏ Tests
a) Fresh properties :Slump Test, Compaction factor test
b) Mechanical properties :Compressive strength, Flexural strength, Splitting tensile
strength

18. Department of Civil Engineering
MATERIAL PROPERTIES
S.No Property Result
1 Specific gravity 3.125
2 Standard consistency 35%
3 Initial setting time 240 mins
4 Fineness of cement Residue5%
Cement
S.No Property Result
1 Specific gravity 2.169
2 Sieve Analysis Zone II
3 Bulk Density 1.22
4 Percentage Air void 54.44%
Fine Aggregate
S.No Property Result
1 Specific gravity 2.67
2 Water Absorption 0.8%
3 Bulk density 1.4Kg/l
Coarse Aggregate

19. Department of Civil Engineering
MIX PROPORTIONING
Mix Proportioning for M40
Mix Grade M40
Water Cement Ratio 0.38
Cement 414 kg/m3
Fine Aggregate 801kg/m3
Coarse Aggregate 1095kg/m3
Chemical Admixture 1.24
Water 178kg/m3
Mix Grade M30
Water Cement Ratio 0.45
Cement 350 kg/m3
Fine Aggregate 850kg/m3
Coarse Aggregate 1105kg/m3
Chemical Admixture 0.7
Water 180kg/m3
Mix Proportioning for M30

20. Department of Civil Engineering
TESTS
a) Fresh Properties
Slump Test and Compaction factor
It is found through this experiment that polyethylene glycol help in self curing
by giving improved workability that is slump and compaction factor.

21. Department of Civil Engineering
TESTS
Compressive strength test
Mix Design Average Compressive Strength in N/mm2
3-day 7-day 28-day
M40 28.9 39.99 50.22
M30 21.05 27.40 40.90
Mixes are prepared by adding PEG-200 in different percentage(0.5%, 1%, 1.5% by weight of cement).
Compressive Strength values of M30 and M40 mixes at different

22. Department of Civil Engineering
TESTS
Flexural strength test
Mix Design Average flexural Strength in N/mm2
7-day 28-day
M30 7 9.15
M40 7.5 10.5
Mixes are prepared by adding PEG-200 in different percentage(0.5%, 1%, 1.5% by weight of cement).
Flexural values of M30 and M40 mixes at different

23. Department of Civil Engineering
TESTS
Split Tensile Strength test
Mix Design Average Splitting Tensile Strength
N/mm2
7-day 28-day
M30 1.6 2.8
M40 2.26 3.2
Mixes are prepared by adding PEG-200 in different percentage(0.5%, 1%, 1.5% by weight of cement).
Compressive Strength values of M30 and M40 mixes at different

24. Department of Civil Engineering
Application of Self-Curing Compound on
Concrete
❖As a spray applied membrane to retain moisture on concrete for effective
curing.
❖Suitable for all general concreting application and particular benefit for
large area concrete surface, such as airport runways, roads and bridge
works.
❖It also suitable for a piece works,
Where, it is difficult to curing.
❖It is also suitable for tunnel lining work.

25. Department of Civil Engineering
Advantages of Self-Curing Concrete
❖Improved curing of concrete enhances cement hydration and provides a
more durable concrete.
❖Lower maintenance.
❖Control of moisture loss improves surface quality.
❖Reducing permeability.
❖Producing a hard wearing and dust free surface.
❖Minimizing potential for surface cracking and shrinkage.
❖Fugitive colour provides visual guide during application.
❖Water Based, therefore, non-flammable.
❖Increase early age strength.
❖Spray application reduces labour cost and eliminates the need for
alternative curing systems.

26. Department of Civil Engineering
Some Curing Compounds
CONCURE WB
❖ Specifications:-
• Base- Wax
• Shelf Life- 12 Months
• Coverage- 3.4 to 5m2/litre
• Cost – Rs 90/litre.
• Specific Gravity- 0.75-0.81
• Drying time- 30-40 Minutes
❖ Features
• Single application.
• No other curing necessary.
• Easy and Safe Spray application
• Endures hard wearing surface
❖ Specifications:-
• Base- Water
• Shelf Life- 18 Months
• Coverage- 3.5 to 5.5m2/litre
• Cost – Rs 110/litre.
• Specific Gravity- 0.82-0.85
• Drying time- 50-60 Minutes
❖ Features
• Single application.
• No other curing necessary.
• Easy and Safe Spray application
• Light reflective grades minimize solar
temperature gain.
CONCURE LP90

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Types Of Curing Compounds
Synthetic Resin(WB) & Wax ❖ Description:-
• They seals the concrete effectively.
• With the time their efficiency will get reduced.
• If Plastering is required to be done the surface can be washed off with hot
water.
• Its gives an average efficiency of about 80%.
❖ Description:-
• Additional advantages of having better adhesion of subsequent plaster. It
does not need be washed with hot water.
• Better Bonding for plaster.
❖ Description:-
• It does not only protect concrete from drying out but also fill the minutes
pores in the surface of concrete.
• The surface film will ear out eventually
Acrylic Based
Chlorinated Rubber

28. Department of Civil Engineering
REFERENCES
● “Introducing the Self-Curing Concrete in Construction Industry”. International journal
Engineering Research & technology
● “Experimental Study on Strength Properties of Self Curing Concrete by Using Poly
Ethylene Glycol as Self Curing Agent”
International Research Journal of Engineering and Technology
● “An Experimental Investigation of Eco-Friendly Self-Curing Concrete Incorporated with
Polyethylene Glycol”
International Advanced Research Journal in Science, Engineering and Technology.

29. Department of Civil Engineering
CONCLUSION
The following conclusions are drawn on the present investigations;
➢ The variation between concrete cured conventionally and with self curing compound is
about 3.32% for compression strength and 20.94% for split tensile strength
Hence Self curing techniques may be economically and efficiently adopted in remote as
well as water scarcity areas.
➢ The Surface of the self cured cement paste is less permeable to water vapour than
that of normal cured cement paste.
➢ Curing compounds increases early strength of concrete than normal cured concrete.
➢ Concrete with curing compounds gives smooth and fine finished surface than concrete
without curing compound.
➢ About 100% of results have been attained in compressive strength with small amount
of water this method can be implemented in construction field.

30. Department of Civil Engineering
THANK YOU