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EFFECT OF CURING METHODS ON THE
PROPERTIES OF PLAIN AND BLENDED CEMENT
CONCRETES
Presented by
D.V.L.HARSHITHA
I/II M.Tech, Engineering Structures
Roll No: CE 091030
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CONTENTS
METHODOLOGY OF RESEARCH
MATERIALS
SPECIMEN PREPARATION
EXPOSURE
TEST TECHNIQUES
R ESULTS
PLASTIC SHRINKAGE STRAIN
DRYING SHRINKAGE STRAIN
COMPRESSIVE STRENGTH
PULSE VELOCITY
DISCUSSION
CONCLUSIONS
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INTRODUCTION
Curing of concrete is very essential for its strength gain and
durability.
Proper curing becomes very difficult under hot weather conditions
as low humidity and high ambient temperature greatly assist in the
evaporation of the mix-water
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Curing becomes even more important if it contains supplementary
cementing materials, such as fly ash, ground granulated blast furnace
slag, or silica fume
Concrete is mostly cured by covering it with wet burlap. In some cases
it is also done by coating the freshly cast surface with a curingcompound
y Acrylic compounds
y water based compounds
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MATERIALS
y Plain Cement
y very fine fly ash (VFFA)
y silica fume
y fly ash
y Type 1 cement
y Crushed limestone
y Dune sand
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Constituent (wt.%) Type I cementVery fine fly ash
(VFFA)Silica fume Fly ash
SiO2 20.52 53.5 93.7 52.8
Al2O3 5.64 34.3 0.16 34.3
Fe2O3 3.8 3.6 0.12 3.6
CaO 64.35 4.4 0.65 4.4
Mgo 2.11 1 0.39 1.1
SO3 2.1 -- 0.23 0.1
Loss on ignition 0.7 -- 5.14 0.8
K 2O 0.36 0.8 0.02 0.5
Na2O 0.19 -- 0.02 0.4
Na2O equiv 0.43 -- --
MnO2 -- -- 0.1
TiO2 -- 1.7 -- 1.6
C3S 56.7 -- -- --
C2S 16.05 -- -- --
C3A 8.25 -- -- --
C4AF 11.56 -- -- --
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The concrete mixtures were proportioned on a weight basis.
The following parameters were kept constant in all the
mixtures
Cementitious material content: 370 kg/m3.
Coarse/fine aggregate ratio: 1.64.
Effective water to cementitious materials ratio: 0.45.
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Specimen preparation
Specimen size (mm) Property
100 × 100 × 300 Plastic shrinkage
100 × 100 × 300 Drying shrinkage
100 × 100 × 100 Compressive strength
100 × 100 × 100 Pulse velocity
50 × 100 × 300 Moisture retention
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The concrete specimens were tested for the following:
Plastic shrinkage.
Drying shrinkage.
Pulse velocity, according to ASTM C 597.
Compressive strength after 3, 7, 14, 28 and 90 days,
according to ASTM C 39.
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Results
Plastic shrinkage strain in the plain cement concrete specimens.
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Drying shrinkage strain
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Curing Efficiency Index (CEI)
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The CEI varied from 86% to 91% in the concretespecimens cured by the application of acrylic-based
curing compound.
In the concrete specimens cured by applying thewater-based curing compound the CEI ranged from
84% to 89%
The CEI with regard to the pulse velocity was in the
range of 95±97%, indicating that the application of
either acrylic-or water-based
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CONCLUSIONS
The curing compounds investigated in this study, namely
acrylic-and water-based, were effective in decreasing theplastic and drying shrinkage strain in both the plain and the
blended cement concretes
The curing compounds investigated, namely the acrylic-and
water-based curing compounds were effective in retaining
the moisture required for the development of denseness andcompressive strength of both plain and blended cement
concretes
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The data developed in this study have indicated that curing
compounds could be utilized for curing plain and blended
cement concretes without any negative effect on plastic and
drying shrinkage and strength development and denseness
This is a positive implication for regions with scarcity of water or in situations where curing with water is difficult.
Among the two curing compounds investigated, acrylic-
based curing compound performed better than the water-
based curing compound.
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REFERENCES
www.wikipedia.com Concrete technology by M.S.SHETTY
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