The document discusses the use of self-curing agents like water soluble polymeric glycol in concrete. Self-curing concrete cures itself without external water by absorbing moisture from the atmosphere. The study aims to determine the optimum dosage of polyethylene glycol (PEG) as a self-curing agent under different curing conditions. PEG is added to concrete mixes to increase the density of water and reduce evaporation during curing. Test results show that concrete cubes cured with PEG have higher compressive strength of 33MPa compared to 28MPa for water-cured cubes after 28 days. The document concludes that self-curing concrete addresses issues with lack of proper curing.

1. BY
1. A.Laxman (126K5A0104)
2. P.Sandeep (116K1A0113)
3. MD.Azghar (116K1A0106)
4. MD.Mudassir (116K1A0111)
5. MD.Rezwan (116K1A0112)

2. Water Is Important In Our Day To Day Life. Water Is Used
For Domestic, Irrigation And Several Purpose. Water Also
Plays A Key Role In Concrete. The Main Aim Of
Investigation Is To Study The Behavior Of Concrete, When
Self Curing Agents Like Water Soluble Polymeric Glycol Is
Used. Self Curing Concrete Is Curing Of Concrete By Its
Own Without Any External Supply Of Water. The Strength
And Durability Of Concrete Will Be Fully Developed Only
If It Is Cured Properly. To Achieve Good Cure, Excessive
Evaporation Of Water From Fresh Concrete Should Be
Avoided. Curing Operations Should Ensure That
Adequate Amount Of Water Is Available For Cement
Hydration To Occur. To Reduce Evaporation, Water
Density Should Be Increased. To Increase Density Of Water
An Admixture Of Polymeric Glycol Is Mixed In Water.

3. Curing is the process of controlling the rate and extent of
moisture transport from concrete during Cement hydration.
It may be either after it has been placed in position (or
during the manufacture of concrete products), thereby
providing time for the hydration of the cement to occur.
Since the hydration of cement does take time in days, and
even weeks rather than hours curing must be undertaken for
a reasonable period of time. The curing period may depend
on the properties required of the concrete, the purpose for
which it is to be used, and the ambient conditions, i.e. the
temperature and relative humidity of the surrounding
atmosphere. Curing is designed primarily to keep the
concrete moist, by preventing the loss of moisture from the
concrete during the period in which it is gaining strength.

4.  Internal curing refers to the process by which the hydration
of cement occurs because of the availability of additional
internal water that is not part of the mixing water.
 Even no any external curing is required after placing which
the properties of this concrete are at least comparable to
and even better than those of concrete with traditional
curing.
Why to do self curing
 Self curing concrete is provided to absorb water from
atmosphere to achieve better hydration of cement in
concrete. It solves the problem that the degree of cement
hydration is lowered due to no curing or improper curing.

5. METHODS OF CURING:
Currently, there are four major methods available for curing of concrete.
a. Immersion.
b. Ponding.
c. Spraying.
d. Wet covering.
MECHANISM OF SELF CURING:
 The polymers added in the mix mainly form hydrogen bonds with
water molecules and reduce the chemical potential of the molecules.
 which in turn reduces the vapors pressure, thus reducing the rate of
evaporation from the surface.

6.  The objective of the investigation is to use the water soluble
polymeric glycol, selected from a group consisting of
polyethylene glycol(peg) as self curing agent and to decide
the optimum dosage for different curing conditions under
arid atmospheric conditions.
 one concrete mix of ordinary Portland cement (OPC) was
considered for the study.
 Poly ethylene glycol of molecular weight 4000 was used as a
self curing agent in concrete.

7. CEMENT :
 The most common cement used is an ordinary
portland cement (OPC). The ordinary portland
cement of 53 grade is used.
WATER :
 water is an important ingredient of concrete as it
actually participates in the chemical reaction
with cement. Since it helps to form the strength
giving cement gel, the quantity & quality of water
is required to be looked into very carefully. Water
cement ratio used for M20 concrete is 0.45

8. AGGREGATES :
 Aggregates are the important constituents in
concrete. They give body to the concrete, reduce
shrinkage and effect economy.
COARSE AGGREGATE :
 The fractions from 20mm to 4.75mm are used as
coarse aggregates. The coarse aggregates are
obtained from crushed basalt rock, conforming
to IS:383 are used. The flakiness index and
elongation index were maintained well below
15%.

9. FINE AGGREGATE :
Those fractions from 4.75mm to 150microns are termed as fine
aggregate. The river sand and crushed sand is used in
combination as fine aggregate.
POLYETHYLENE GLYCOL-4000:
Polyethylene glycol is a condensation polymer of ethylene
oxide and water with the general formula H(OCH2CH2)nOH.
USES :
Addition of PEG water density increases and evaporation
decreases.
Vapour pressure decreases and evaporation also decreases.
Cement hydration process takes place continously .

10.  DESIGN MIX:
 A mix M20 grade was designed as per IS10262:2009 and the
same was used to prepare the test samples.
 The design mix proportion is calculated individually for
cement, fly ash, coarse aggregate, fine aggregate and W/C
ratio.
 Required amount of cement is weighed.
 Total amount of material collected and weighed according
to required proportions are mixed by placing all at one
place.
 Required amount of water is added for the mix carefully.
DESIGN MIX METHODOLOGY

11. • Standard metallic cube moulds (150*150*150 mm) were casted for
compressive strength.
• All the materials taken with required quantity are mixed
thoroughly.
• A tamping rod was used for compaction of the hand filled
concrete cubes.
• The specimens were demoulded after 24 hours and placed them
in a room & room temperature is maintained.
• After 28 days individually cubes were tested for the
determination of average compressive strength.
• Test was performed on compression testing machine having a
capacity of 200 MT.

12. CONCLUSION:
 The compressive strength for water curing cubes for 28
days is 28Mpa & for PEG used concrete cubes the
compressive strength after 28 days is 33Mpa.
 Self curing concrete is the answer to many problems faced
due to lack of proper curing.
 Wrapped curing is less efficient than Membrane curing
and Self-Curing it can be applied to simple as well as
complex shapes.
 One common feature of PEG appears to be the water-
soluble nature.

13. Queries..??