STRENGTH PROPERTIES OF FLYASH BASED GEOPOLYMER CONCRETE

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International Journal of Civil Engineering and Technology (IJCIET)Volume 8, Issue 1, January 2017, pp.

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ISSN Print: 0976-6308 and ISSN Online: 0976

© IAEME Publication Scopus

STRENGTH PROPERTIES

GEOPOLYMER CONCRETE

PG Student

K L University

Associate

ABSTRACT

Objective: The experimental study is done on various parameters i.e., Strength parameters,

NaOH solution concentration, the alkalescent hydroxide to alkalescent salt ratio, period of curing,

additional water in mix has been investigated.

The Alkaline content used in the study is the amalgam of Sodium Hydroxide and Sodium silicate

with the different ratios 1:2, 1:2.5, 1:3. The total numbers of specimens 81 are being casted The

Geopolymer specimens are tested for their Compressive, Flexural and Tensile strengths at the ages

of 3-7-28 days. Findings: The strength properties strength are increased with the increase in

activator ratio. The strength of all GPC specimens improved with the increase in cu

Applications/ Improvements:

like parking tiles, precast GPC beams, girders, pavement tiles, railway precasted sleepers, building

blocks, electric power poles. They are good resis

Key words: Geopolymer concrete, Fly ash, Sodium Silicate, Sodium Hydroxide

Cite this Article: V.Sowjanya and N.

Concrete. International Journal of Civil Engineering and Technology

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1. INTRODUCTION

Concrete is the most typical material used in construction. Concrete is casted by victimization of normal

cement (OPC) because of the binding property. While production of OPC high quantity of greenhouse gas

is discharged in to the atmosphere ( one weight unit of cement production releases roughly 1tonne of CO2)

that leads to warming3,4

.Several efforts were made to measure in advanceme

utilization of cement in casting the concrete so as to handle the world warming problems

the use of supplementary cementing ingredients like Granulated Blast chamber scum, Silica Fume, rice

husk ash and Metakaolin6. Due to the accumulation of the fly ash on the barren earth, the landfills is

increasing day to day. Fly ash established Geo

IJCIET/index.asp 834

International Journal of Civil Engineering and Technology (IJCIET) , pp. 834–840, Article ID: IJCIET_08_01_098

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6308 and ISSN Online: 0976-6316

Scopus Indexed

STRENGTH PROPERTIES OF FLYASH BASED

GEOPOLYMER CONCRETE

V.Sowjanya

PG Student, Civil Engineering Department,

K L University, Vaddeswaram, Guntur,

N. Srujana

Associate Professor, Civil Engineering Department,

K L University, Vaddeswaram, Guntur

The experimental study is done on various parameters i.e., Strength parameters,


additional water in mix has been investigated. Method: The mix is trailed initially for 8 Molarity.



s are tested for their Compressive, Flexural and Tensile strengths at the ages

The strength properties strength are increased with the increase in

activator ratio. The strength of all GPC specimens improved with the increase in cu

Flyash based geopolymer concrete can be used as precast products


blocks, electric power poles. They are good resistance towards fire, permeability.

Geopolymer concrete, Fly ash, Sodium Silicate, Sodium Hydroxide

V.Sowjanya and N. Srujana, Strength Properties of Flyash Based Geopolymer

International Journal of Civil Engineering and Technology, 8(1), 2017, pp.



binding property. While production of OPC high quantity of greenhouse gas


.Several efforts were made to measure in advanceme

utilization of cement in casting the concrete so as to handle the world warming problems

the use of supplementary cementing ingredients like Granulated Blast chamber scum, Silica Fume, rice

Due to the accumulation of the fly ash on the barren earth, the landfills is

increasing day to day. Fly ash established Geo-polymer concrete may be a recently developed concrete.

[email protected]

&IType=1

OF FLYASH BASED

GEOPOLYMER CONCRETE

Professor, Civil Engineering Department,

The experimental study is done on various parameters i.e., Strength parameters,


The mix is trailed initially for 8 Molarity.



s are tested for their Compressive, Flexural and Tensile strengths at the ages

The strength properties strength are increased with the increase in

activator ratio. The strength of all GPC specimens improved with the increase in curing time. .

Flyash based geopolymer concrete can be used as precast products


tance towards fire, permeability.

Geopolymer concrete, Fly ash, Sodium Silicate, Sodium Hydroxide

Srujana, Strength Properties of Flyash Based Geopolymer

, 8(1), 2017, pp. 834–840.



binding property. While production of OPC high quantity of greenhouse gas


.Several efforts were made to measure in advancement to enhancement the

utilization of cement in casting the concrete so as to handle the world warming problems4,5

. These includes

the use of supplementary cementing ingredients like Granulated Blast chamber scum, Silica Fume, rice-

Due to the accumulation of the fly ash on the barren earth, the landfills is

polymer concrete may be a recently developed concrete.

Strength Properties


The elementary constituents of ash

sodium hydroxide7.

The objectives of the present study square measure to develop a Geo compound concrete combine, to

identify and study the result of parameters like matter quantitative relation, type of natural action that

impound effects on the properties of fly ash

properties of the recent and hardened state of ash, based mostly geo compound concrete, to study the

performance of ash based geo compound concrete

2. OBJECTIVE

The Experimental Study Is Done On Various Parameters I.E., Strength Parameters, NaoH Solution

Concentration. The Alkalescent Hydroxide To Alkalescent Salt Ratio, Period Of Curing, Additional Water

In Mix Has Been Investigated.

3. METHODOLOGY

3.1. Materials Used

• Fly ash.

• Metakaolin

• Sodium hydroxide

• Sodium silicate

• Aggregates

3.1.1 Fly Ash

Class F type of flyash, collected from Vijayawada Thermal Plant is used are ingredient of the casted

concrete.

3.1.2 Alkaline Solution:

Anamalgamation of alkalescent hydroxide solution and alkalescent salt was preferred. The Sodium

solutions were preferred as they were economical than that of the Potassium

are shown in Fig 2.

Strength Properties of Flyash Based Geopolymer Concrete


The elementary constituents of ash-based Geo-polymer concrete are fly ash, a



effects on the properties of fly ash-based geo compound concrete, to study short


performance of ash based geo compound concrete8,9

.




Figure 1 Fly ash

Anamalgamation of alkalescent hydroxide solution and alkalescent salt was preferred. The Sodium

solutions were preferred as they were economical than that of the Potassium-based. Sodium silicate flakes

f Flyash Based Geopolymer Concrete

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polymer concrete are fly ash, aggregates, sodium salt,



based geo compound concrete, to study short-term engineering





Anamalgamation of alkalescent hydroxide solution and alkalescent salt was preferred. The Sodium-based

based. Sodium silicate flakes


3.1.3 Fine Aggregate

The locally available fine aggregate, confining to Zone II. Initially the aggregate chosen is sieved through

4.75mm and the passing material is chosen for the test.

3.1.4 Coarse Aggregate

Locally available coarse mixture of about 10mm linear unit s

3.2 Preparation of Alkaline Activator Solution

A amalgamation of alkaline salt solution, alkalescent hydroxide solution was selected which results an

alkaline liquid. 320 g (8 X 40= 320)

element hydroxide resolution of 8M. The Alkaline activator resolution should be prepared twenty

hours before its intended use. The sodium hydroxide solution is mixed with glass resolution to induce the

required alkaline resolution twenty minutes before making the geopolymer concrete.

3.3 Trial mix proportion of Geopolymer concrete

Table 1 represents the Quantities of materials for 1 cubic meter of Geo polymer concrete

S.No Material

1 Fly Ash

2 Metakaolin

3 Fine aggregate ( Passing through

4.75 mm size sieve)

4 10mm size coarse aggregate

5 Mass of NaOH Solution

6 Mass of Na2 SiO3 Solution

7 Liquid to Fly ash Ratio

8 Extra water

3.4 MIXING AND CURING

3.4 .1 Mixing

NaOH solution and Na2SiO3 solution should be 20mins before mixing it with the dry materials.

All these ingredients were mixed for about 3 minutes. After casting of specimens compaction is done.

Specimens are compacting on a vibrating table for 10 seconds. The GPC mix wa

V.Sowjanya and N. Srujana


Figure 2 Sodium hydroxide flake


4.75mm and the passing material is chosen for the test.

Locally available coarse mixture of about 10mm linear unit size were chosen.

ne Activator Solution


320 g (8 X 40= 320) of caustic soda flakes dissolved in one litre of

element hydroxide resolution of 8M. The Alkaline activator resolution should be prepared twenty


twenty minutes before making the geopolymer concrete.

3.3 Trial mix proportion of Geopolymer concrete


Material Quantities

1:2 1:2.5

331.04 kg/m3 331.04 kg/m

82.76 kg/m3 82.76 kg/m

Fine aggregate ( Passing through

540 kg/m

3 540 kg/m

10mm size coarse aggregate 1260 kg/m3 1260 kg/m

Mass of NaOH Solution 62.1 kg/m3 53.2 kg/m

Solution 124.1 kg/m3 133 kg/m

Liquid to Fly ash Ratio 0.45 0.45

45.5 kg/m3 45.5 kg/m

solution should be 20mins before mixing it with the dry materials.


Specimens are compacting on a vibrating table for 10 seconds. The GPC mix wa

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of caustic soda flakes dissolved in one litre of water to rearrange

element hydroxide resolution of 8M. The Alkaline activator resolution should be prepared twenty-four


twenty minutes before making the geopolymer concrete.


Quantities

1:3

331.04 kg/m3

331.04

kg/m3

82.76 kg/m3 82.76 kg/m

3

540 kg/m3 540 kg/m

3

1260 kg/m3 1260 kg/m

3

53.2 kg/m3 46.6 kg/m

3

133 kg/m3 139.6 kg/m

3

0.45

45.5 kg/m3 45.5 kg/m

3

solution should be 20mins before mixing it with the dry materials.


Specimens are compacting on a vibrating table for 10 seconds. The GPC mix was shown in Fig 3. Three

Strength Properties


different mixes were casted in this study, for respective mix 27 cubes of 150mm,27 cylinders of diameter

150mm and height 300mm and 27 beams of 500mm x 100mm x 100mm were cast to study the

compressive test, split tensile test and f

3.4.2Curing

After demoulding of these specimens, they were maintained at 27

temperature maintained during the test action of the sample was 23

Ambient curing.

3.5 Testing

The specimens were tested and strengths were calculated for 3, 7,28 days. The failure of specimens were

shown in Fig 5.





compressive test, split tensile test and flexural test of each mix.

Figure 3 Mixing of GPC

After demoulding of these specimens, they were maintained at 270C (room) temperature. The normal

temperature maintained during the test action of the sample was 230 C. Fig 4 shows the specimens under

Figure 4 Specimens under curing 4]



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C (room) temperature. The normal

C. Fig 4 shows the specimens under



4. RESULTS

The various strength tests to be do

• Compressive test

• Split tensile test

• Flexural test

4.1. Compressive Strength

The cube specimens are tested in CTM to verify their compressive strengths at the age of 3days, 7days and

28days of ambient action. Fig 6 represents the compressive strength

increases there is increment in Compression strength of the specimens with respect to age of the

specimens.

Figure 6 Compressive Strength @ age of 3

4.2. Split Tensile Strength

The Cylinder Samplings are tested in CTM for Tensile strength of concret

tensile strength of concrete.As the activator ratio increases there is increment in Split tensile strength of the

specimens with respect to age of the specimens.



Figure 5 Testing of specimens

The various strength tests to be done are


28days of ambient action. Fig 6 represents the compressive strength of concrete.


Compressive Strength @ age of 3-7-28 days for different Activator ratios

The Cylinder Samplings are tested in CTM for Tensile strength of concrete. Figure 7 represents the split



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of concrete. As the activator ratio


for different Activator ratios

e. Figure 7 represents the split


Strength Properties


Figure 7 Split tensile Strength @ age of 3

4.3. Flexural Strength

The beam specimens are tested using two point loading method as per I.S.516

Flexural Strength of concrete. As the activator ratio increases there is increment in Flexural strength of the


Figure 8 Flexural Strength @ age of 3

5. CONCLUSIONS

1. The strength properties viz., Compressive, Split tensile and Flexural strength increased with the increase in

activator ratio.

2. The strength of all GPC specimens improved with increment in time of curing.

3. The % increase in compressive strength with th

16.71%, for 7 days 4.95%, 4.07% and 2.3%, 11% for 28 days.

4. The % increase in split-tensile strength with the control specimen for ratios 1:2, 1:2.5, 1:3 is 21%, 30.43%,

for 7 days 4.06%, 3.12% and



Split tensile Strength @ age of 3-7-28 days for different Activator ratios

ted using two point loading method as per I.S.516

As the activator ratio increases there is increment in Flexural strength of the


Flexural Strength @ age of 3-7-28 days for different Activator ratios

The strength properties viz., Compressive, Split tensile and Flexural strength increased with the increase in

The strength of all GPC specimens improved with increment in time of curing.

The % increase in compressive strength with the control specimen for ratios 1:2, 1:2.5, 1:3 is 6.55%,

16.71%, for 7 days 4.95%, 4.07% and 2.3%, 11% for 28 days.

tensile strength with the control specimen for ratios 1:2, 1:2.5, 1:3 is 21%, 30.43%,

for 7 days 4.06%, 3.12% and 3.125%, 18.18% for 28 days.


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or different Activator ratios

ted using two point loading method as per I.S.516-1959. Fig 8 represents the

As the activator ratio increases there is increment in Flexural strength of the

28 days for different Activator ratios

The strength properties viz., Compressive, Split tensile and Flexural strength increased with the increase in

The strength of all GPC specimens improved with increment in time of curing.

e control specimen for ratios 1:2, 1:2.5, 1:3 is 6.55%,

tensile strength with the control specimen for ratios 1:2, 1:2.5, 1:3 is 21%, 30.43%,


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5. The % increase in flexural strength with the control specimen for ratios 1:2, 1:2.5, 1:3 is 0 %, 9%, for 7

days 14.9%, 0% and 0%, 39.52% for 28 days.

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STRENGTH PROPERTIES OF FLYASH BASED GEOPOLYMER CONCRETE

Engineering

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