1. The document discusses the use of nanosilica to improve the properties of cement composites containing industrial waste like fly ash. Test results show that optimal additions of nanosilica increase the short-term and long-term strength as well as density of both ordinary Portland cement and fly ash cement composites. 2. Microstructure images indicate that nanosilica fills the pores in the cement matrix, resulting in stronger and denser composites. While nanosilica improves short-term properties, these benefits were not confirmed in the long-run when used alone. However, when fly ash waste is added to cements along with nanosilica, the enhanced properties are retained both in the short

1. Nanosilica Interfacing
for waste Recycling in
Cements
Prof.Mainak Ghosal
(Jt.Secy,Coal Ash Institute of India & PhD Scholar,IIEST)
International Online Conference on Nano Materials (ICN 2021)

2. Table of Contents
01
OVERVIEW
Describe the topic
of the section
02
QUOTE
Famous
Personality
03
ASSIGNMENT
My Research
04
THE CONCLUSION
Findings/Inference

3. Nanosilica despite being
small sized
Waste disposal
&
Long term strength
Problem Solution

4. What are ‘Ash Effects’ ?
Ash Effects!

5. Flyash generation in India
Source: Ministry of Power
Current producton
levels in MT
2019-20
Past production
levels in MT
2017-18 196.44
226.13

6. 100% Utilization(101 Power Stn.)
Source: Ministry of Power
100% or more
90%-100%
14
47

7. Major Modes of Fly ash Utilization during 2019-20
Source : Ministry of Power
Cement, 25.60%
Mines, 4.69%
Bricks/Tiles,
9.46%
Land Fills, 25.50%
Roads, 9.27%
Agriculture, 0.06% Concrete, 0.74%

8. What Is
This Topic
About?
Using Industrial Waste(Fly
ash) with Nano silica in
Cement Concrete

9. Definition of SSA Concepts
SSA-250 m2/g
NANOSILICA
SSA-0.3m2/g
FLYASH
SSA-0.225m2/g
CEMENT

10. Features of Particle Size
5-40nm
NANOSILICA
0.1-90m
FLYASH
2-50m
CEMENT

11. Overview
1. Mohammed, B.S.; Awang, A.B.; Wong, S.S.; Nhavene, C.P. Properties of nano silica modified rubbercrete. J.
Clean. Prod. 2016, 119, 66–75.
2. Li, W.; Luo, Z.; Long, C.; Wu, C.; Duan, W.H.; Shah, S.P. Effects of nanoparticle on the dynamic behaviors of
recycled aggregate concrete under impact loading. Mater. Des. 2016, 112, 58–66.
3. Aly, M.; Hashmi, M.; Olabi, A.; Messeiry, M.; Abadir, E.; Hussain, A. Effect of colloidal nano-silica on the
mechanical and physical behaviour of waste-glass cement mortar. Mater. Des. 2012, 33, 127–135.
4. Liu, M.; Zhou, Z.; Zhang, X.; Yang, X.; Cheng, X. The synergistic effect of nano-silica with blast furnace slag in
cement based materials. Constr. Build. Mater. 2016, 126, 624–631.
5. Said, Aly M, Mohamed S Zeidan (2009). Enhancing the reactivity of normal and fly ash concrete using colloidal
nano silica. Special Publication 267: 75-86.
6. Behzadian, R. & Shahrajabian, H. KSCE J Civ Eng (2019) 23: 3660. https://doi.org/10.1007/s12205-019-
2440-9.

12.  nano-SiO2 to concrete
mixtures improved their
reactivity, compressive
strength, tensile strength and
resistance to chloride ion
penetration
 Upto 30% flyash replacement
levels achieved with improved
mechanical performance with
nano-SiO2 addition
1

13.  nano-SiO2 (NS) and nano-
CaCO3 (NC) were incorporated to
replace cement by mass of 1 and
2% in RACs
 nanomodified RACs exhibit higher
(static and dynamic) compressive
strengths compared to control RAC
 NS is more effective to improve
dynamic compressive strengths of
RAC
2

14.  most effective mineral against
external sulfate attacks was
found to be nano-silica (NS)(8%)
 highest compressive strength
was observed with 4% NS
replacement, whereas the
highest flexural strength was
observed with 13% MS
replacement
3

15.  Nano-silica has a negative
effect on the hydration of BFS
 Nano-silica(3%) enhances the
compressive strength of
cement matrix with
BFS(10%,20%,30% & 40%)
 Nano-silica and BFS(30%)
significantly reduce the porosity
of the cement matrix.
4

16. 5
 Diff. content of nano-silica was
added to concrete containing 10
wt.% of waste PET aggregates
 flexural, tensile and compressive
strength of the composites
declined with the PET aggregates
 Optimum composition containing
10 wt.% of PET and 3 wt.% of nano
silica was obtained, in which the
tensile strength, compressive
strength, and flexural strength
were increased 27%, 30%, and 9%
respectively compared to the neat
concrete

17. 6
 Inclusion of crumb rubber
decreasing the concrete
strengths.
 Rubbercrete(0%, 10%, 25% &
50%) has many worthwhile
benefits.
 Inclusion nano silica(0%, 1%,
2%, 3%, 4% & 5%) in
rubbercrete leading to improve
its strengths.
 Nano silica has modified the
microstructure of rubbercrete.

18. “
”
4 technologies are going to drive the
future world and future India —
biotechnology, nano- technology,
information technology and environment
technology

20. Tests on Cement Composites
CEMENT
1 Part
SAND
3 Parts
WATER
IS:4031
NANOSILICA

21. Portland Cement
Strength;Density(Kg/m3)
0% 21.08MPa;2264.08 31.89MPa;2315.4 30.01MPa;2229.10
0.75% NS 27.73MPa;2266.49 42.27MPa;2233.07 31.5MPa;2327.62
1.0% NS 25.07MPa;2293.64 37.36MPa;2256.65 32.41MPa;2304.90
1.50% NS 23.81MPa;2223.23 37.79MPa;2278.54 29.12MPa;2314.41
7 D 365D
28 D

22. Flyash based Cement
Strength;Density(Kg/m3)
0% 11.36MPa;2103.57 22.44MPa;2123.21 23.52MPa;2166.33
0.75% NS 23.66MPa;2143.77 27.45MPa;2220.97 35.5MPa;2386.65
1.0% NS 18.97MPa;2293.64 27.56MPa; 2152.41 27.77MPa;2286.96
1.25% NS 19.15MPa;2205.32 26.20MPa;2221.03 31.69MPa;2264.29
7 D 365D
28 D

23. 1950
2000
2050
2100
2150
2200
2250
2300
2350
2400
2450
7 D 28 D 365 D
Density(Kg/m3)
OPC NS + OPC Flyash Cement NS+ Flyash Cement
10%

24. 0
5
10
15
20
25
30
35
40
45
7 D 28 D 365 D
Strength(MPa)
OPC NS + OPC Flyash Cement NS+ Flyash Cement
51%

25. Micro
Structure
Li, Zongjin
(2011). Advanced
concrete technology.
John Wiley & Sons.

26. NS in
Pore
Filling

27. Conclusions
1. Optimum additions of Nano silica have achieved stronger and denser
cement composites
2. But the results were not confirmed in the long run
3. With the addition of fly ash wastes in cements, these properties were
retained @ both short & long terms

28. CREDITS: This presentation template was
created by Slidesgo, including icons by
Flaticon, and infographics & images by
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