international journal of technical research (ijtr) vol. 5 ...nano-silica :-generally there are two...

International Journal of Technical Research (IJTR) Vol. 5, Issue 1, Mar-Apr 2016

ISSN 2278-5787 Page 207

Partial Replacement Of Cement With

Nanosilica To Micro Structural Investigation

For Strength Properties Of Cement Mortar Vikram Singh

1,Magandeep Bishnoi

2

M.tech scholor1, Assistant Professor

2 Department of Civil Engineering

OITM Hisar(125001),Haryana , India

[email protected], [email protected]

Abstract-The main aim of this investigation is to explore

the influence of colloidal silica on the strength

properties of cement mortar. The mortar was made by

using Ordinary Portland cement because the Portland

Pozzolana Cement contains fly ash i.e. silica content in

it. The colloidal silica of 30% concentration with four

percentages (0.6%, 1.8%, 1.8%, and 2.4% by weight of

replacement of cement) and particle size of 20nm was

used for the investigation. Fresh Properties,

compressive strength and the micro structural analysis

of all the mixes was carried out. The results were

compared with the conventional cement mortar. Results

showed that by the partial replacement of cement

mortar with nano silica, the physical and mechanical

properties of cement like Compressive strength and

durability increased. The Scanning electron microscopy

and X-ray diffraction analysis revealed that colloidal

silica improves the properties of cement mortar by

giving denser, uniform and more compact mixtures.

The outcome of the investigation should be elaborately

studied before validating it.

INTRODUCTION

Nanomaterials are the materials which have at least

one dimension in the range of 1 to 100 nm.

Nanotechnology is an outstanding field of research

gaining huge interest and is being applied in various

areas to fabricate new products which can outperform

with their physical and chemical properties. The most

wide-ranging material in the world Cement Mortar is

a nano structural composite material that improves

with time. The totaling of pozzolanic material is a

bless for both cement and concrete because there is a

tremendous amplification in the effectiveness. Nano

Silica, Silica Fume, Fly ash are the pozzolanic

materials. The main prerequisite is to augment the gel

structure and stabilize it and to improve the

mechanical properties of the casted cement mortar.

This can be achieved by replacing cement by very

small amount of nano silica. During investigation it

was analyzed that with the addition of nano silica the

micro structure was denser and uniform than that of

traditional mix. LITERATURE REVIEW

Lok Partap Singh et.al., (2015) investigated the

effect of powdered and colloidal nano silica on the

properties of cement mortar. Powdered nano silica

used was with particle size of 40nm and colloidal

silica used was of partical size 20 nm. The powder ns

was synthesised using sol gel technique. SEM and

XRD showed that the powder NS is amorphous in

nature while colloidal is agglomerated in nature.

Ehsan Mohseni et. Al., (2015) studied the combined

effect of nano SiO2 (NS), Nano TiO2 (NT) and Nano

Al2O3(NA) on physical and chemical properties of

self compacting cement containing fly ash. The nano

particles were used at three amounts of 1%, 3% and

5% on the cement by wt. while the amount of fly ash

was remained constant .

Ehsan Ghafari et. Al., (2014) studied the effect of

nano silica on the properties of high performance

concrete. Thermo gravimetric analysis showed that

nano silica consumes Ca(OH)2 more than the micro

silica at the early stages. The addition of nano silica

results in decrease of capillary pores.

R. Yu et. Al., (2014) presented the effect of nano

silica on microstructure development and hydration

of the Ultra High Performance Concrete (UHPC).

The design was based on the modified Andersen

particle packing model. Results showed that the

structure obtained after the addition of super

plasticizer was comparatively homogeneous with the

low binder amount while the hydration was extended.

K. Sobolev et.al., (2014) analysed the influence of

nano silica (5- 70 nm) on the physical properties of

cement. The strength development of Portland

cement with nano silica was studied. From

experimental study of cement mortar with nano silica

an increase in flexural and compressive strength was

obtained. The addition of nano silica resulted in

overall enhancement of cement mortar.

EXPERIMENT AND METHODOLOGY:-

Nano-Silica :-Generally there are two types of nano-

silica being manufactured at this point one is in

powdered form and other is in colloidal form. The

type of nano-silica used in this study is of colloidal

type with particle size of 20nm approximately with

30% concentration. In the investigation the nano-

silica used for the partial replacement of cement was

of 4 percentages.

i. MN1 - 0.6%

mailto:[email protected],%20%20Er.magandeep


ISSN 2278-5787 08

ii. MN2 - 1.2%

iii. MN3 - 1.8%

iv. MN4 - 2.4%

Tests on cement

1. Consistency of cement

2. Fineness Test

3. Initial setting time

4. Final setting time

Consistency of cement:-Normal consistency of

cement was tested for 5 samples Control mix CMS,

MN1, MN2, MN3 and MN4

CMS -Mix without Nano-Silica

MN 1-Specimen with 0.6 % Nano-Silica

MN 2- Specimen with 1.2% Nano-Silica

MN 3- Specimen with 1.8 % Nano-Silica

MN 4- Specimen with 2.4 % Nano-Silica.

Table : Standard Consistency of cement

Sr.

No. Specimen

Nano-silica

Content Consistency

1 CMS 0% 30

2 MN1 0.6% 32

3 MN2 1.2% 33

4 MN3 1.8% 35

5 MN4 2.4% 35

Fig.: Consistency of Cement controlled and with

nano-silica

Initial Setting Time of Cement:-

Table : Initial Setting Time of Cement

Sr. No. Specimen Nano-silica Content

Initial Setting

Time

(Min)

1 CMS 0% 52

2 MN1 0.6% 49

3 MN2 1.2% 43

4 MN3 1.8% 42

5 MN4 2.4% 38

Graph: Initial setting time of cement controlled

and with nano-silica


ISSN 2278-5787 Page 209

Final Setting Time:-

Table : final setting time

Sr. No. Specimen Nano-silica Content

Final Setting

Time

(Min)

1 CMS 0% 277

2 MN1 0.6% 266

3 MN2 1.2% 257

4 MN3 1.8% 252

5 MN4 2.4% 250

Figure 4.3: Final setting time of cement controlled

and with nano-silica

Fineness of cement:-

Sieve sizes Zone 1 Zone2 Zone3 Zone4

10mm 100 100 100 100

4.75mm 90-100 90-100 90-100 95-100

2.36mm 60-95 75-100 85-100 95-100

1.18mm 30-70 55-90 75-100 90-100

600 micron 15-34 35-59 60-79 80-100

300 micron 5-20 8-30 12-40 15-50

150 micron 0-10 0-10 0-10 0-15

Casting of Mortar Cubes:-

Mixing proportions for Mortar

Specimens:-

Specifications CM NM1 NM2 NM3 NM4

Cement (Kg/m3) 200 198.80 197.60 196.40 195.20

Sand (Kg/m3) 600 600 600 600 600

nS (%) 0

0.6 1.2 1.8 2.4

nS (gm) 0 1.2 2.4 3.6 4.8

nS (ml)

(as 30% colloidal nS is

used)

0 2.67 5.33 8 10.67

Water (Kg/m3) 84 86.13 86.27 88.40 86.53

COMPRESSIVE STRENGTH TEST:-

Table : Compressive Strength

Sr.No. Mix Nano Silica Content Compressive Strength (MPa)

3 Days 7 Days 28 Days 56 Days

1 CMS 0% 25.96 32 40.37 43.76

2 MN1 0.6% 30.79 37.21 47.2 50.66

3 MN2 1.2% 32.4 38.68 47.9 52.32

4 MN3 1.8% 33.05 39.76 49.57 53.56

5 MN4 2.4% 32.79 39.86 49.92 53.21

Figure : Compressive Strength of cement

controlled and with nano silica

MICRO STRUCTURAL INVESTIGATION:-

Scanning Electron Microscopy:-


ISSN 2278-5787 Page 210

Fig

ure :CMS 4 Days

Figure :CMS 7

Days

Figure :CMS 28 days

Figure:MN-1 4 days

Figure: MN-1 7 Days

Figure: MN-1 28 Days


ISSN 2278-5787 Page 211

Fig

ure: MN-2 4 Days Figure:

MN-2 7Days

Figure: MN-3 4days

Figure: MN-2 28 days


ISSN 2278-5787 Page 212

Figure: MN-3 7 Days

Figure: MN-3 28 days

Figure: MN4 4 days

Figure: MN4 7 days

Figure: MN-4 28 Days

X-ray Diffraction Analysis:-


ISSN 2278-5787 Page 213

Position [°2Theta] (Copper (Cu))

20 30 40 50 60 70 80

Counts

0

5000

10000

CMS 1 3 days


20 30 40 50 60 70 80

Counts

0

5000

10000

CMS 1 7days

Graph: CMS-1 4 Days

Graph: CMS-1 7 Days


20 30 40 50 60 70 80

Counts

0

5000

10000

CMS 1 28 days


20 30 40 50 60 70 80

Counts

0

2000

4000

CMS 2 3 days

Graph: CMS-1 28 Days

Graph: CMS-2 4 Days


20 30 40 50 60 70 80

Counts

0

2000

4000

CMS 2 7days


20 30 40 50 60 70 80

Counts

0

1000

2000

3000

CMS 2 28 days


ISSN 2278-5787 Page 214

Graph:CMS-2 7 Days Graph:

CMS-2 28 Days


20 30 40 50 60 70 80

Counts

0

1000

2000

3000

4000 MN 1 3 Days


20 30 40 50 60 70 80

Counts

0

2000

4000

CMS 2 7days

Graph: MN-1 4 Days

Graph: MN-1 7 Days


20 30 40 50 60 70 80

Counts

0

1000

2000

3000

4000

MN 1 28 days


20 30 40 50 60 70 80

Counts

0

1000

2000

3000

4000

MN 2 3days

Graph: MN-1 28 Days

Graph: MN-2 4 Days


20 30 40 50 60 70 80

Counts

0

1000

2000

3000

4000

MN 2 7days


20 30 40 50 60 70 80

Counts

0

1000

2000

3000

MN 2 28 days

Graph: MN-2 7 Days

Graph: MN-2 28 Days


20 30 40 50 60 70 80

Counts

0

1000

2000

MN 3 3days


20 30 40 50 60 70 80

Counts

0

2000

4000

MN 3 7days

Graph: MN-3 4 Days

Graph: MN-3 7 Days


ISSN 2278-5787 Page 215


20 30 40 50 60 70 80

Counts

0

2000

4000

MN 3 28 days


20 30 40 50 60 70 80

Counts

0

2000

4000

6000

MN 4 3days

Graph: MN-3 28 Days

Graph: MN-4 4 Days


20 30 40 50 60 70 80

Counts

0

1000

2000

3000

4000

MN 4 7days


20 30 40 50 60 70 80

Counts

0

1000

2000

3000

4000 MN 4 28 days

Graph: MN-4 7 Days Graph:

MN-4 28 Days

CONCLUSIONS:-

Based on the scope, materials, techniques, procedures

and other parameters associated with this work, the

following conclusions and recommendations can be

stated:

Due to partial replacement of cement with nano silica

improve the mechanical properties of cement mortar

significantly.

Nano silica mortar studied showed higher

compressive strength than the control mix.

When microscopic examination was done it was

found that the nano-silica which is commercially

available has lower particle size than silica fumes and

other pozzolanas.

With the addition of nano silica there was a decrease

in the initial setting time as well as final setting time.

Addition of nano silica also resulted in early high

strength gain in cement mortar. REFRENCES

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international journal of technical research (ijtr) vol. 5 ...nano-silica :-generally there are two...

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