Strength And Workability Characteristics Of Super Plasticized Concrete.

Submitted By:
Ashish Vivek Sukh (U13CE012)
Devprakash Choudhary (U13CE026)
Dipanjam Sarkar(U13CE028)
Kathamrita Basak (U13CE711)
Guide: M. Hemapriya
Assistant Professor
Dept. of Civil Engineering
Bharath University

Introduction
 Concrete is a building material composed of cement, sand as fine
aggregate, crushed rock as coarse aggregate and water
 High Performance Concrete (HPC) is defined as a concrete meeting
special combination of performance and uniform characteristics that
cannot always be achieved routinely using conventional constituents,
and normal mixing, placing and curing practices .
 HPC are the concrete that had many advantageous engineering
properties such as high strength, high modulus of elasticity, high
workability, low permeability, etc.
 The ultimate goals of using super plasticizers are to improve one or
more aspects of concrete performance.

Materials
 Cement: The Portland Pozzolana Cement (PPC) 53 grade
is used in this investigation.
 Fine Aggregate: The Locally available river sand is used as
fine aggregate in the concrete design mix.
 Coarse Aggregate: The coarse aggregate used in the
experimental investigation is a mixture of between 20mm
and 10mm size aggregate.
 Water: Water should be free from sewage, oil, acid, strong
alkalis or vegetable matter, clay and loam. The water used
in the concrete is potable, and is satisfactory to use.

Superplasticizer
 A ‘Chemical Admixture’ is any chemical additive to the
concrete mixture that enhances the properties of concrete
in the fresh or hardened state.
 The chemicals that reduces the water demand for a given
workability are called ‘water reducers’.
 The chemicals that reduces those entraining air in the
concrete for providing resistance to freezing and thawing
action called ‘air entrainer’.
 And those chemicals that control the setting time and
strength gain rate of concrete called ‘accelerators’ and
‘retarders’.

 Other chemicals for special purposes – namely, viscosity
modifying agents, shrinkage reducing chemicals,
corrosion inhibiting admixtures, and alkali-silica reaction
mitigating admixtures.
 By using Super plasticizer water content can be reduced
up to 20% and above.

SCOPE AND OBJECTIVE:
The aim of this study is to produce concrete using ordinary Portland cement
and super plasticizer.
 To study the workability of conventional concrete and superplasticized
concrete.
 To develop the strength of concrete.
 To reduce the water content by adding super plasticizer.
 To study the strength characteristics of conventional concrete and
super plasticized concrete.
The scope of the study is to improve the strength of the concrete by adding
superplasticizer which will reduce water content and hence the voids
will also be reduced which makes the concrete impermeable in nature.

Literature review:
 S.Krishna Rao et al (2015) studied effect of chemical admixtures on
mechanical properties in analysis the paper presents the experimental
work carried out in order to evaluate the mechanical properties of
roller compacted concrete mixtures in which a chemical admixture like
super plasticizer is added in different dosages.
 Nanak J Pamnani et al (2013) studied on Comparison and Optimization
of Dosage of Different Super-Plasticizers for Self Compacted Concrete
Using Marsh Cone. He study that as mix design of Self compacted
concrete is based on trial and error method, it is important to find the
optimum dose of Super plasticizer in order to minimize the trials and
labour and the dosages are decided on cement slurry which is prepared
using different amount of Super plasticizer for a fixed water cement
ratio .

 Venu Malagavelli et al(2012) studied on Strength and
Workability Characteristics of Concrete by Using Different
Super Plasticizers Concrete, a composite material made
with cement, aggregates, admixtures or super plasticizers
and water comprises in quantity the largest of all man-
made materials.
 V. Bhikshma et al (2009) Investigations on mechanical
properties of high strength silica fume concrete.
applications of high strength concrete have been in high
rise buildings, long span bridges and in some special
applications in structures, it is necessary to reduce the
water/cement ratio To overcome low workability problem,
different kinds of pozzolanic mineral admixtures are
added.

 R. Ilangovana et al (2008) studied on strength and
durability properties of concrete containing quarry rock
dust as fine aggregate. River sand is most commonly used
fine aggregate in the production of concrete poses the
problem of acute shortage in many areas. Whose continued
use has started posing serious problems with respect to its
availability, cost and environmental impact.
 Paratibha Aggarwal et al (2008) studied Self-Compacting
Concrete - Procedure for Mix Design. Self-compacting
concrete is a fluid mixture suitable for placing in structures
with congested reinforcement without vibration. Also,
compatibility is affected by the characteristics of materials
and the mix proportions; it becomes necessary to evolve a
procedure for mix design of Self Compaction Concrete.

 Saeed Ahmad et al (2005) studied effect of superplasticizers
on workability and strength of concrete. the lowest
possible water/cement ratio while maintaining a high
workability. To a considerable extent this dream has been
fulfilled with the advent of superplasticizers.
 Chiara F. Ferraris (1999) studied Measurement of the
rheological Properties of High Performance Concrete
(HPC). The flow properties of concrete in general and high
performance concrete in particular are important because
many factors such as ease of placement, consolidation,
durability, and strength depend on the flow properties.

METHODOLOGY:
Grade of concrete M20
Preliminary Test of Cement, Coarse aggregate,
fine aggregate
Test for Hardened concrete after
7days, 21days & 28 days
Slump, Compaction factor test & Vee-Bee
test of normal concrete and
Superplasticized concrete
Fresh concrete
Casting of cube, beam, cylinder of normal
concrete and Superplasticized concrete
Mix design
Analysis
AnalysisConclusion

Test on cement, fine aggregate & coarse aggregate
Materials Properties Values
Cement
Specific Gravity
3.15
Fineness, %
98.067%
Consistency, %
35%
Initial Setting time, min
45 min
Fine Aggregate
Specific Gravity 2.57
Gradation Zone II
Coarse Aggregate
Specific Gravity
2.66
Impact Value, %
26.33%
Crushing Value, %
21.72%
Los Angeles Abrasion Value, % 5%

MIX DESIGN FOR M20 GRADE OF CONCRETE:
 Design Stipulations
1. Characteristic compressive strength required in the field at 28 days - 20 N/mm2
2. Maximum size of aggregate - 20 mm
3. Degree of workability - 0.85
4. Degree of quality control - GOOD
5. Exposure Condition - SEVERE
 Test Data for Materials
1. Cement Used - PPC 53 grade
2. Water Absorption
1. Coarse Aggregate - 0.64%
2. Fine Aggregate - 1.8%
3. Specific Gravity
1. Cement - 3.15
2. Fine Aggregate - 2.57
3. Coarse Aggregate - 2.66
4. Free Surface Moisture
1. Coarse Aggregate - NIL
2. Fine Aggregate - 1.5%
5. Sieve Analysis
1. Fine Aggregate - 5.54

 Target Mean strength
 For a tolerance factor of 1.65 and using table 4.1 the target mean strength for specified
characteristic cube strength is 20+1.65×4
1. Characteristics compressive strength of Concrete - 20 N/m2
2. Tolerance factor - 1.65
3. Standard Deviation - 4 N/mm
4. Target mean strength - 26.6 N/mm2
 Selection of Water-Cement Ratio
 From fig 6.1 the free water cement ratio required for the target strength of 26.6N/mm2
is0.45. This is lower than the maximum value of 0.50 prescribed for ‘Severe’ exposure is
IS456-2000.
 Selection of Water Content
 From table 5.4 for 20mm nominal maximum size aggregate
 Water content per cubic meter of concrete = 186 kg
 Determination of Cement Content
 Water cement ratio - 0.45%
 Water - 186lit/m3
 Cement - 413.33kg/m3

 PROPORTION OF VOLUME OF COARSE
AGGREGATE AND FINE AGGREGATE CONTENT
 From Table 3 (IS10262-2009). volume of coarse aggregate
corresponding to 20 mm size aggregate and fine aggregate
(Zone II) for water-cement ratio of 0.50 =0.62. In the present
case water-cement ratio is 0.45. Therefore. volume of coarse
aggregate is required to be increased to decrease the fine
aggregate content. As the water-cement ratio is lower by 0.04.
the proportion of volume of coarse aggregate is increased by
0.008 (at the rate of -/+ 0.01 for every ± 0.05 change in water-
cement ratio). Therefore. corrected proportion of volume of
coarse aggregate for the water-cement ratio of 0.45 = 0.63.

 6.8.8 MIX CALCULATIONS
 The mix calculations per unit volume of concrete shall
be as follows:
 Volume of Concrete = 1m3
 V
 V

 Volume of all in aggregate = [ a-(b+c) ]
= 1 – (0.131 + 0.186)
=0.68 m3
 Mass of Coarse Aggregate = d × volume of coarse
aggregate × specific gravity of
coarse aggregate × 1000
= 0.68 x 0.63 x 2.66 x 1000 = 1140 Kg
 Mass of Fine Aggregate =d × volume of fine aggregate × specific
gravity of fine aggregate × 1000
= 0.68 x 0.37 x 2.57 x 1000
= 645 Kg

CEMENT FINE
AGGREGATE
COARSE
AGGREGATE
WATER
413kg/ m3 645 1140 186liters
1 1.56 2.76 0.45
MIX PROPORTIONS

Test on fresh concrete
Test 0% 1% 2% 3%
Slump (mm) 33 37 41 45
Compacting
Factor
0.830 0.865 0.901 0.927
Vee Bee
Time (sec)
7.09 5.11 4.21 2.11

7days Compressive Strength Of Concrete
SL. PERCENTAGE OF SUPERPLASTICIZER
ADDED INTO THE NORMAL CONCRETE
COMPRESSIVE
STRENGTH (N/mm²)
1 0% of Superplasticizer 16.227

0
5
10
15
20
25
30
35
40
0 0.5 1 1.5 2 2.5 3 3.5
COMPRESSIVE
STRENGTH(N/mm²)
% of Superplasticizer

COMPRESSIVE
STRENGTH (N/mm²)

0
5
10
15
20
25
30
35
40
0 0.5 1 1.5 2 2.5 3 3.5
COMPRESSIVE
STRENGTH(N/mm²)
21 days Compressive Strength Of Concrete

COMPRESSIVE
STRENGTH (N/mm²)

0
5
10
15
20
25
30
35
40
0 0.5 1 1.5 2 2.5 3 3.5
COMPRESSIVE
STRENGTH(N/mm²)
28 days Compressive Strength Of Concrete

7days Tensile Strength Of Concrete
TENSILE
STRENGTH (N/mm²)

0
0.5
1
1.5
2
2.5
3
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
TENSILE
STRENGTH(N/mm²)
7 days Tensile Strength Of Concrete

TENSILE
STRENGTH (N/mm²)

0
0.5
1
1.5
2
2.5
3
3.5
0 0.5 1 1.5 2 2.5 3 3.5
TENSILE
STRENGTH(N/mm²)

ADDED INTO THE NORMAL
CONCRETE
TENSILE
STRENGTH (N/mm²)

2.9
2.92
2.94
2.96
2.98
3
3.02
3.04
3.06
0 0.5 1 1.5 2 2.5 3 3.5
TENSILE
STRENGTH(N/mm²)

7days Flexural Strength of Concrete
FLEXURAL
STRENGTH (N/mm²)

4.9
4.95
5
5.05
5.1
5.15
5.2
5.25
5.3
5.35
0 0.5 1 1.5 2 2.5 3 3.5
FLEXURAL
STRENGTH(N/mm²)

21days Flexural Strength Of Concrete
CONCRETE
FLEXURAL
STRENGTH (N/mm²)

5.3
5.35
5.4
5.45
5.5
5.55
5.6
5.65
5.7
0 0.5 1 1.5 2 2.5 3 3.5
FLEXURAL
STRENGTH(N/mm²)

CONCRETE
FLEXURAL
STRENGTH (N/mm²)

5.4
5.5
5.6
5.7
5.8
5.9
6
0 0.5 1 1.5 2 2.5 3 3.5
FLEXURAL
STRENGTH(N/mm²)

The following conclusions are observed from the test results.
[1]. The workability of the concrete such as compaction factor and vee-
bee degree increases with increase in percentage of superplasticizer
[2]. The compressive strength of the concrete increases by 56.60% that
to conventional concrete at 2% of superplasticizer added.
[3]. The flexural strength of the concrete increases by 0.5% that to
conventional concrete at 1% of superplasticizer added.
[4]. The tensile of the concrete is increases by 4.77% that to conventional
concrete at 2% of superplasticizer added.
[5]. The properties of hardened concrete such as compressive
strength, Tensile strength and Flexural strength are increasing with
increase in percentage of superplasticizer. It is observed that the
optimum dosage of superplasticizer to be used is 2%.
CONCLUSIONS

REFERENCES:
 Chiara F. Ferraris (1999) “Measurement of the rheological Properties of
High Performance Concrete (HPC).” Volume 104, number 5.
 Paratibha Aggarwal, Rafat Siddique, Yogesh Aggarwal, Surinder M
Gupta (2008) “Self-Compacting Concrete - Procedure for Mix Design”
Issue 12, January-June 2008 p. 15-24.
 R. Ilangovana, N. Mahendrana and K. Nagamanib (2008) “Strength and
durability properties of concrete containing quarry rock dust as fine
aggregate” VOL. 3, NO. 5, ISSN 1819-6608
 S.Krishna Rao and Y.Mohan Sai Kiran Associate (2015) “chemical
admixtures on mechanical properties in analysis” (ACI 325.10R-99
2004).

 Nanak J Pamnani and Palakkumar D. Patel (2013) “Comparison
and Optimization of Dosage of Different Super-Plasticizers for
Self Compacted Concrete” VOL. 10, NO. 3.
 Saeed Ahmad and Md. Nawaz (2005) “superplasticizers on
workability and strength of concrete”
 Paratibha Aggarwal and Rafat Siddique (2008) “Self-Compacting
Concrete - Procedure for Mix Design”.
 R. Ilangovana, N. Mahendrana and K. Nagamanib (2008)
“strength and durability properties of concrete containing quarry
rock dust as fine aggregate”.
 IS 10262:2009. (Concrete mix proportioning-Guidelines)
 Book: Concrete Technology by M. L. Gambhir

Strength And Workability Characteristics Of Super Plasticized Concrete.

Recommended

Recommended

More Related Content

What's hot

What's hot (20)

Similar to Strength And Workability Characteristics Of Super Plasticized Concrete.

Similar to Strength And Workability Characteristics Of Super Plasticized Concrete. (20)

More from AshishVivekSukh

More from AshishVivekSukh (6)

Recently uploaded

Recently uploaded (20)

Strength And Workability Characteristics Of Super Plasticized Concrete.