Asha PPT New

STUDY ON USE OF BOTTOM ASH AND
SILICA FUME IN CONCRETE

Under
the Guidance of
Submitted by
Asha Sedeq
138W1D8701
T.Sujatha
Asst professor
Civil Engineering Department
CONTENTS
Abstract
Introduction
Literature review
Bottom Ash
Silica Fume
Methodology
ABSTRACT
The possibility of substituting natural fine aggregate
with industrial by-products such as waste bottom ash offers
technical, economic and environmental advantages
to
construction sector.
The fine aggregate has been replaced by bottom ash
accordingly in the range of 10 to 50 percent by weight for M30
mix to determine compression test, splitting tensile test and
flexural test.
The main field of application of silica fume is
aspozolanic material for concrete. The silica fume is added to
cement accordingly in the range of 5 to 20 percent by weight
for M30 mix along with bottom ash to determine compression
test, splitting tensile test and flexural test.
INTRODUCTION
The use of river sand as fine aggregate leads to exploitation of natural
resources, lowering of water table, sinking of bridge piers and erosion of

river bed.
If fine aggregate is replaced by by specific percentage and in specific size
range, it will decrease fine aggregate content.
Cement is the mixture of calcareous, siliceous, argillaceous and other
substances Cement is used as a binding material in mortar and concrete.
Literature review
[1] P.Aggarwal1EFFECT OF BOTTOM ASH AS REPLACEMENT OF
FINE AGGREGATES IN CONCRETE
The strength development for various percentages (0-50%) replacement
of fine aggregates with bottom ash is compared to the strength development
of normal concrete.
Compressive strength, Split tensile strength and Flexural strength of
fine aggregates replaced bottom ash concrete specimens were lower than
control concrete specimens at all the ages
[2] Mohd Syahru The Properties of Special Concrete Using Washed
Bottom Ash (WBA) as Partial Sand Replacement
Bottom ash of 10% cement replacement by weight is not suitable for
concrete because it has produce a lower strength concrete at the early ages
which can results in ruptures during construction.
The mechanical properties of special concrete with 30% WBA
replacement of natural sand is found to be an optimum
[3] Turhan Bilir Effect of Bottom Ash as Fine Aggregate on Shrinkage

Cracking of Mortars
The replacement was made by weight; the replacement ratios for BA as
fine aggregate were 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, and 100%.
From the experimental tests concluded that the optimum ratios for the
use of BA as a mineral admixture in mortars was a BA content of
approximately 40 to 50% in the means of ultrasonic pulse velocity and
flexural and compressive strengths. Consequently, the usage of BA as fine
aggregate was acceptable and appropriate regarding this comparative study.
[4] M.P.KADAM Effect of Coal Bottom Ash as Sand replacement on the
properties of concrete with different w/c ratio
The natural sand was replaced with coal bottom ash by 0%, 10%,
20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% by weight, as
water absorption of bottom ash was more so that quantity of water was
increased to achieve 100 mm slump. Mix design M-35 grade of concrete
was used to study the different harden properties of concrete.
The test shows that compressive strength for 7, 28, 56 and 112 days
was increased up to 20% replacement and after that compressive strengths
were decreased from 30% to 100% replacement.
[5]Kiyoshi Kohno Use of Ground Bottom Ash and Silica Fume in

Mortar and Concrete
The early strength such as 7, 28 days are decreased gradually, but
when steam curing and autoclave curing are used, concretes using ground
bottom ash and silica fume have higher compressive strength as compared
with concrete without them and the mixing of these by-products has a
good effect on concrete under accelerated curing.
[6] Prof. Vishal S. Ghutke Influence of Silica Fume on concrete
It has been seen that when cement is replaced by silica fume
compressive strength increases up to certain percentage (10% replacement
of cement by silica fume).But higher replacement of cement by silica fume
gives lower strength.
The optimum value of compressive strength can be achieved in 10%
replacement of silica fume. As strength of 15% replacement of cement by
silica fume is more than normal concrete. The optimum silica fume
replacement percentage is varies from 10 % to 15 % replacement level.
[7] Milagre Martins "Durability and strength properties of concrete

containing coal bottom ash
This study evaluates the influence of replacing cement by bottom
ashes or fly ashes, from the same Portuguese coal power station, on the
properties of fresh and hardened concrete, namely on workability,
compressive strength, accelerated carbonation, chloride diffusion,
absorption and capillary porosity.
If the w/b ratio is maintained, concretes made with bottom ash
exhibit performance similar to that of concretes with fly ash, both in
terms of compressive strength and resistance to environmental actions.
BOTTOM ASH
The most common type of coal-burning
furnace in the electric utility industry is the

dry, bottom pulverized coal boiler. When
pulverized coal is burned in a dry, bottom
boiler, about 80 percent of the unburned
material or ash is entrained in the flue gas
and is captured and recovered as fly ash. The
remaining 20 percent of the ash is dry bottom
ash, which is a dark gray, granular, porous,
predominantly material that is collected in a
water-filled hopper at the bottom of the
furnace
SILICA FUME
Silica fume is generally known
as micro-silica. It may be added directly to
concrete as an individual ingredient or in a
blend of Portland cement. Silica Fume is a
byproduct of silicon alloys such as
ferrochromium, ferromanganese,
ferromagnesium, and calcium silicon.It is
collected during the reduction of high-purity
quartz with coal in electric furnaces.
METHDOLOGY
Determination of material properties.
Calculation of mix design
Calculation of weight of material
Casting of 6cubes, 6cylinders, 6beams for 7days
and 28 days.
Testing
Comparison of results for various proportions of
bottom ash with replacement of fine aggregate
&addition of silica fume with cement.
PROJECT SPECIFICATIONS:
Grade of concrete: M-30
Cement used: OPC 53 grade
Code using:
IS: 456-2000, IS: 10262-2009
Mix ratio:1:1.5:3
w/c ratio: 0.4-0.45
Material properties
Specific gravity of cement: 3.15
Specific gravity of natural sand: 2.6
Sieve analysis: zone-2
Fineness modulus: 2.91
Bulk density of CA: 1732.3 kg/m3
Material quantity
Ratio: 1:1.5:3
Cement: 410kg/m3
FA: 620kg/m3
CA: 1259 kg/m3
Details of work
The fine aggregate is replaced by bottom ash the
percentages of 10%, 20%, 30%, 40%,50%.

The silica fume is added in addition to the cement
accordingly in the ratio of 5%,10%,15%,20%.
For each trail 6 cube specimens, 6 beam specimens, 6
cylindrical specimens are casting.
In that each 3 specimens are tested for 7days and
28days.
The range of slump has been taken as 20-80mm and
max slump is 50mm.
For each trail the slump, compressive strength, flexural
strength, split tensile strength are observed.
Work completed
Testing of raw materials of cement, FA, CA has
done and data has been collected.

Mix design has been prepared and mix ratio has
been concluded.
By taking w/c ratio as 0.42 and without super
plasticizer conventional trail mix for M-30 grade
has been casted.
The slump value is of 50mm
The conventional mix has been casted for 7 and
28days compressive, flexural and split tensile
strengths.
THANK YOU

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STUDY ON USE OF BOTTOM ASH AND

SILICA FUME IN CONCRETE

resources, lowering of water table, sinking of bridge piers and erosion of

[3] Turhan Bilir Effect of Bottom Ash as Fine Aggregate on Shrinkage

[5]Kiyoshi Kohno Use of Ground Bottom Ash and Silica Fume in

[7] Milagre Martins "Durability and strength properties of concrete

furnace in the electric utility industry is the

percentages of 10%, 20%, 30%, 40%,50%.

done and data has been collected.

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