 Open Access
 Total Downloads : 0
 Authors : Rasik Fayaz , Er. Parvinderjeet Kaur , Er. Kiran Talwar
 Paper ID : IJERTV7IS080074
 Volume & Issue : Volume 07, Issue 08 (August – 2018)
 Published (First Online): 05012019
 ISSN (Online) : 22780181
 Publisher Name : IJERT
 License: This work is licensed under a Creative Commons Attribution 4.0 International License
Utilization of Rice Husk Ash and Waste Paper Sludge Ash as Partial Replacement of Cement in Concrete
Utilization of Rice Husk Ash and Waste Paper Sludge Ash as Partial Replacement of Cement in Concrete
Rasik Fayaz
2. Er. Parvinderjeet Kaur
Student, Assistant Professor,
Department of structural engineering, Department of structural engineering,
Indo Global College Of Engineering, Indo Global College Of Engineering, Mohali, Punjab 140109 Mohali, Punjab 140109
3. Er Kiran Talwar
Assistant Professor, Department of Structural Engineering,
Indo Global Group of Colleges, Mohali, Punjab 140109
Abstract – Cement mortar and concrete are the most widely used construction materials. Due to growing environmental awareness, as well as regulations on managing industrial waste, the world is increasingly turning to researching properties of industrial wastes and finding solutions on using their valuable component parts so that those might be used as secondary raw material for other industrial applications. Paper sludge production is a byproduct of paper making in the Paper Mill Industries and Rice Husk is a byproduct of rice processing.In the present scenario, these byproducts are being used in other industrial branches and in the field of civil constructions, such as in cement manufacturing along with clinker and in masonry work for civil works. This research work demonstrates the possibilities of using rice husk ash and waste paper sludge ash together as partial replacements of cement in concrete. This research work presents an investigation of compressive strength, and split tensile strength of concrete by adding rice husk ash and waste paper sludge ash as partial replacement of cement in various percentages.In this project Rice Husk Ash (RHA) and Waste Paper Sludge Ash (WPSA) obtained from uncontrolled combustion are used as an alternative construction material for concrete. In the present investigation, a feasibility study is made to use Rice Husk Ash and Waste Paper Sludge Ash as an admixture to Ordinary Portland Cement in Concrete, and an attempt has been made to investigate the strength parameters of concrete (Compressive and Splitting Strength). For control concrete, IS method of mix design is adopted and considering this a basis, mix design for replacement method has been made. Four differentreplacement levels namely 5%,10%, 15%and 20% are chosen for the study concern to replacement method. Large range of curing periods starting from 7days and 28days are considered in the present study. Cubes (150Ã—150Ã—150mm) and Cylinders (150Ã¸Ã—300mm) with varying ratios of RHA, WPSA and mix of both will be casted. Total no of cubes casted would be 78 and cylinder would be78. The various tests would be performed to evaluate the action of these materials will be normal consistency, setting time, compressive strength, splitting strength and water absorption. The study would be conducted in the framework of a research project aiming at improving the utilization potential of Rice Husk &Waste paper Sludge Ash.
1.1GENERAL

INTRODUCTION
Concrete is one of the most widely used construction products in the world. It is mixture of cement, fine aggregate, course aggregate and water. Concrete construction does not require highly skilled labour. The durability of concrete depends upon proportioning, mixing and compacting of the ingredients. The cost of construction materials is increasing day by day because of high demand, scarcity of raw materials, and high price of energy.Agricultural waste (rice husk ash) and industrial by product (silica fume) (waste paper) have been widely used as partial replacement materials or cement replacement materials in concrete works. The advantages by incorporating these supplementary cementing materials include energy consumption saving (in cement production), low cost, engineering properties improvement, and environmental conservation through reduction of waste deposit. Durability is linked to the physical, chemical and mineralogical properties of materials and permeability. Any improvement in these properties is likely to aid durability. Addition of a pozzolanic material to concrete mix may lead a considerable improvement in the quality of the concrete and its durability. A pozzolanic material or pozzolan has been described as a siliceous and aluminous material. At ordinary temperature and with the presence of moisture it chemically reacts with calcium hydroxide (lime) to form compounds possessing cementitious properties. Rice husk ash (RHA) and silica fume (SF) waste paper sludge ash (WPSA)are considered as richsilica materials or pozzolanic materials used to replace a portion by mass basic of Portland cement in order to modify the physical and engineering properties of cement and concrete. When these materials blended with cement and in the presence of water, they can react with Calcium Hydroxide (Ca(OH)2) which forms in hydrated Portland cement to produce additional CalciumSilicate Hydrate (CSH). With the addition of the these pozzolanic materials, many aspects of concrete properties can be favorably influenced, some by physical effects associated with small particles which have generally a finer particle size distribution than ordinary Portland cement and others by pozzolanic and cementitious reactions resulting in certain
desirable physical effects. Concrete mix proportion and rheological behavior of plastic concrete are caused by the physical effects associated with the particle size and morphology of pozzolans. Strength and permeability of hardened concrete are the main effects associated with the pozzolanic and cementitious reactions. Several studies in developing countries, including Guyana,Thailand, Pakistan and Brazil, have shown that rice husk ash (RHA) can be used as a partial replacement for cement in concrete. The ability to use an agricultural waste product to substitute a percentage of Portland cement would not only reduce the cost of concrete construction in these countries, but would also provide a means of disposing of this ash, which has little alternative uses. Additionally, cement manufacturing is an energyintensive process, so in addition to reducing the cost of concrete construction and providing a means for disposing of an agricultural waste product, incorporating RHA into concrete as a partial substitute for Portland cement would also stand to reduce the amount of energy associated with concrete construction. The rapid industrialization has resulted in generation of large quantities of wastes. Most of the wastes do not find any effective use and create environmental and ecological problems apart from occupying large tracts of valuable cultivable land. It has been observed that some of these wastes have high potential and can be gainfully utilized as raw mix / blending component in cement manufacturing. The utilization of the industrial solid wastes in cement manufacture will not only help in solving the environmental pollution problems associated with the disposal of these wastes but also help in conservation of natural resources ( such as limestone) which are fast depleting. The other benefits to cement industry include lower cost of cement production and lower greenhouse gas emission per ton of cement production. This may also enable cement industries to take benefits of carbon trading.
2.1GENERAL

MATERIALS AND METHODS
This chapter describes the properties of material used for making concrete mixes determined in laboratory as per relevant codes of practice. Different materials used in tests were OPC, coarse aggregates, fine aggregates, rice husk ash and wate paper sludge ash. The description of various tests which were used in this study is given below:

ORDINARY PORTLAND CEMENT
Ordinary Portland Cement (OPC) of 53 Grade (Ambuja cement) was used throughout the course of the investigation. The physical properties of the cement as determined from various tests conforming to Indian Standard IS: 12269:1987 are listed in Table 2.1.
Table 2.1: Properties of OPC 53 Grade
Sr. No.
Characteristics
Values Obtained Experimentally
Values Specified By IS 12269:1987
1.
Specific Gravity
3.10
3.103.15
2.
Standard Consistency
31%
3035
3.
Initial Setting Time
115 minutes
30min(minimum)
4.
Final Setting Time
283 minutes
600min(maximum)
5.
Compressive Strength(N/mm2) 7 days
28 days
38.49 N/mm2
52.31 N/mm2
37 N/mm2
53 N/mm2

Aggregates
Aggregates constitute the bulk of a concrete mixture and give dimensional stability to concrete. The aggregates provide about 75% of the body of the concrete and hence its influence is extremely important.

Fine Aggregates
The sand used for the work was locally procured and conformed to Indian Standard Specifications IS: 3831970. The results are given below in Table 2.3.1 (A) and 2.3.1(B). The fine aggregated belonged to grading zone III.
Table 2.3.1(A): Sieve Analysis of Fine Aggregate
Weight of sample taken =1000 gm
Sr. No
ISSieve (mm)
Mass Retained (gm)
Cumulative mass Retained
Cumulative %age mass
Retained
Cumulative %mass passing through
1
4.74
1
1
0.1
99.9
2
2.36
22
23
2.3
97.7
3
1.18
77
100
10
90
5
600Âµ
153
253
25.3
74.7
6
300Âµ
264
517
51.7
48.3
7
150 Âµ
425
942
94.2
5.8
8
Below150Âµ
58
1000
100
0
Total
283.6
FM of fine aggregate = 283.6/100=2.836
Table 2.3.1(B): Physical Properties of fine aggregates
Characteristics
Value
Specific gravity
2.63
Bulk density
5%
Fineness modulus
2.83

Coarse Aggregates
Locally available coarse aggregate having the maximum size of 20 mm was used in this work. The aggregates were tested as per IS: 3831970. The results are shown in Table 2.3.2(A) and Table 2.3.2(B).
Table 2.3.2(A): Sieve Analysis of Coarse Aggregate (20 mm)
Weight of sample taken =2000 gm
Sr. No
ISSieve (mm)
Mass Retained (gm)
Cumulative mass Retained
Cumulative %age mass Retained
Cumulative % mass passing through
1
40
0
0
0
100
2
20
145
145
7.25
92.75
3
10
1829
1974
98.7
1.3
5
4.74
124
1998
99.9
0.1
6
2.36
0
1998
99.9
0.1
7
1.18
0
1998
99.9
0.1
8
600Âµ
0
1998
99.9
0.1
9
300Âµ
0
1998
99.9
0.1
10
150 Âµ
0
1998
99.9
0.1
11
Below150Âµ
2
2000
100
0
Total
805.35
FM of Coarse aggregate = 805.35/100=8.0535
Table 2.3.2(B): Properties of Coarse Aggregates
Characteristics
Value
Type
Crushed
Colour
Grey
Shape
Angular
Nominal Size
20 mm
Specific Gravity
2.62
Total Water Absorption
0.89
Fineness Modulus
8.05


RHA
In this work, Rice Husk was taken from the locality around Awantipora. Rice husk firstly wash with portable water then dried in the sun. After then rice husk burnt in the open atmosphere so as to convert it into ash.
Table 2.4: Physical properties of Rice Husk Ash
Appearance
Fine powder
Particle Size
Sieved through 90 micron sieve
Specific gravity
2.21
Color
Light grey

WASTE PAPER SLUDGE ASH
Waste paper sludge was taken from JML Waste Paper Corporation, Pathankot, Punjab. Waste paper was burnt in the open atmosphere so as to convert it into ash.
Table 2.5: Physical properties of Waste Paper Ash
Appearance
Fine powder
Particle Size
Sieved through 90 micron sieve
Color
Dark grey
Specific gravity
2.09
4.5 MIX DESIGN
Grade designation
M20
Type of cement grade
OPC 53 grade confirming to IS12269:1987
Maximum nominal size of aggregates
20 mm
Minimum cement content kg/m3
320 kg/m3
Maximum water cement ratio
0.55
Workability
75 mm (slump)
Exposure condition
Mild
Degree of supervision
Good
Type of aggregate
Crushed angular aggregate
Maximum cement content
450 kg/m3
Chemical admixture
Not
The concrete mix design was done by using IS 10262 for M20 grade of concrete. Design stipulations for proportioning
Test Data for Materials
Cemet used
OPC 53 grade confirming to IS 12269:1987
Specific gravity of cement
3.10
Specific gravity of Coarse aggregate Fine aggregate
2.88
2.63
Sieve analysis Coarse aggregate Fine aggregate
Coarse aggregate : Conforming to Table 2 of IS: 383 Fine aggregate : Conforming to Zone III of IS: 383
Target Strength For Mix Proportioning fck = fck + 1.65 s
Where,
fck = Target average compressive strength at 28 days, fck = Characteristic compressive strength at 28 days, s= Standard deviation
From Table 1 standard deviation, s = 4.6 N/mm2
Therefore target strength = 20 + 1.65 x 4.6 = 27.59 N/mm2
Selection of Water Cement Ratio
From Table 5 of IS:4562000, maximum water cement ratio = 0.55 (Mild exposure) Based on experience adopt water cement ratio as 0.50
0.5 < 0.55, hence ok
Selection of water and sand content From Table 4 of IS 10262:1982
Maximum Size of Aggregate(mm)
Water Content including Surface Water, Per Cubic Meter of Concrete(kg)
Sand as percent of Total Aggregate by Absolute volume
20
186
35
Adjustments from Table 6 of IS 10262:1982
Change in condition
Percent adjustment required
Water Content
Sand in total Aggregate
Increase or decrease in water cement ratio that is 0.05
0
2
Increase or decrease in value of compacting by 0.10
0
0
For Sand
0
1.5
Therefore, required sand content as percentage of total aggregate by absolute volume =353.5=31.5% Volume of aggregate= 10031.5=68.5%
Calculation of Cement Content Water cement ratio = 0.50
Cement content = 186/0.5 = 372 kg/m3 >320 kg/m3(given)
From Table 5 of IS: 456, minimum cement content for mild exposure condition = 300 kg/m3 Hence OK
Determination of Coarse and Fine Aggregate contents
From Table 3 of IS 10262:1982,for the specified maximum size of aggregate of 20mm,the amount of entrapped air in the wet concrete is 2 percent.Taking this into account and applying
V= (W+C/SC+1/P Ã— fa/Sfa) Ã—1/1000
Ca =1P/P Ã—fa Ã—Sca/Sfa Where,
V = absolute volume of fresh concrete,which is equal to gross volume(m3) minus the volume of entrapped air. W = mass of water (Kg) per m3 of concrete
C =mass of cement (Kg) per m3 of concrete Sc = specific gravity of cement
P =ratio of FA to total aggregate by absolute volume
Fa, Ca = total masses of FA and CA (Kg) per m3 of concrete respectively
Sfa, Sca = specific gravity of saturated, surface dry fine aggregate and coarse aggregate respectively. 0.98= 186+372/3.10+1/.315 Ã— fa/2.63)Ã— 1/1000
980 = 306+1.20 fa
fa = 561.66 Kg/m3 Ca=1216.74 Kg/m3
The mix proportion then becomes: Water:Cement:Fine Aggregate:Coarse Aggregate 186:372:561.66:1216.74
0.5:1:1.5:3.2
%
Table 2.6: The mixture proportions used in laboratory for experimentation are shown in table
Mix
w/c ratio
Water (Kg/m3)
Cement (Kg/m3)
Fine Aggregate (kg/m3)
Coarse Aggregate (Kg/m3)
RHA
(Kg/m3)
WPSA
(Kg/m3)
Control
–
0.50
186
372
562
1217
–
–
Rice Husk Ash
5
0.50
186
353.4
562
1217
18.6
–
10
0.50
186
334.8
562
1217
37.2
–
15
0.50
186
316.2
562
1217
55.8
–
20
0.50
186
297.6
562
1217
74.4
–
Waste Paper Sludge Ash
5
0.50
186
353.4
562
1217
–
18.6
10
0.50
186
334.8
562
1217
–
37.2
15
0.50
186
316.2
562
1217
–
55.8
20
0.50
186
297.6
562
1217
–
74.4
Mixture of RHA and WPSA
5
0.50
186
353.4
562
1217
9.3
9.3
10
0.50
186
334.8
562
1217
18.6
18.6
15
0.50
186
316.2
562
1217
27.9
27.9
20
0.50
186
297.6
562
1217
37.2
37.2
GENERAL


RESULTS AND DISCUSSION
This chapter presents a summary of the results obtained from laboratory tests that have been done on the specimen. Tests were done on materials (cement, fine aggregates, coarse aggregates, RHA and WPSA), fresh and hardened concrete.

FRESH CONCRETE

Slump Test
The slump value of all the mixture are represented in Table 5.1.1
Table 3.1.1: Slump Tests Results
Mix
Percentage
SlumpValue
Control
0%
90mm
RHA
5%
65mm
10%
55mm
15%
25mm
20%
20mm
WPSA
5%
60mm
10%
55mm
15%
50mm
20%
20mm
Mix (RHA+WPSA)
5%
30mm
10%
20mm
15%
15mm
20%
7mm
The slump value v/s percentage of replacement was shown in Fig 5.1.1. The slump decreased when a higher amount of RHA, WPSA and combination of both (RHA+WPSA) was mix was added in concrete.

Compaction Factor Test

The Compaction factor values of all the mixture are represented in Table 5.1.2
Table 3.1.2: Compaction Factor Results
Mix
Percentage
Compaction Factor
CONTROL
0%
0.93
RHA
5%
0.90
1%
0.87
15%
0.83
20%
0.82
WPSA
5%
0.92
10%
0.90
15%
0.85
20%
0.81
MIX (RHA+WPSA)
5%
0.84
10%
0.83
15%
0.80
20%
0.78
The compaction factor value of control concrete is 0.93. As we go on increasing the % replacement of cement with the RHA from 5 to 20% the compaction factor value decreases from 0.92 to 0.82. In the case of WPSA the compaction factor value decreases gradually from 0.92 to 0.81. And same as in case of Mix (RHA+WPSA) the compaction factor value decreases gradually from 0.84 to 0.78.

Hardened Concrete

: Effect of Age on Compressive Strength
The 28 days strength obtained for M20 Grade Control concrete is 30.93 N/mm2.The strength results reported in table no 5.2.1 are presented in the form of graphical variations, where the compressive strength is plotted against the % of cement replacement.
Table 3.2.1: Compressive Strength of Control concrete in N/mm2
Grade of concrete
7Days
28Days
M20
20.4
30.93
The strength achieved at different ages namely, 7 and 28 for Control concrete.
It is clear that as the age advances, the strength of Control concrete increases. The rate of increase of strength is higher at curing period up to 28 days. However the strength gain continues at a slower rate after 28 days.

Effect of Age on Split Tensile Strength of Control Concrete

The 28 days tensile strength obtained for M20 Grade Control concrete is 2.71 N/mm2.The strength results reported in table no
5.2.2 are presented in the form of graphical variations, where the compressive strength is plotted against the % of cement replacement.
Table 3.2.2: Split Tensile Strength of Control concrete in N/mm2
Grade of concrete
7Days
28Days
M20
1.94
2.71
It is clear that as the age advances, the split tensile strength of Control concrete increases. The rate of increase of strength is higher at curing period up to 28 days. However the strength gain continues at a slower rate after 28 days.

: Effect on Compressive Strength of Concrete Containing various percentages of RHA.
Table 3.2.3: Compressive Strength of RHA Concrete
Mix
Percentage of Cement Replacement
Cube Compressive Strength (N/mm2)
7 days
28 Days
CONTROL
0%
20.4
30.93
RHA
5%
19.67
29.26
10%
19.63
28.85
15%
18.66
24.74
20%
15.22
21.48
Cube Compressive Strength (N/mm2)
35
30
25
20
15
10
5
0
7 days
0% 5% 10% 15% 20%
%age of cement replacement by RHA
As per experimental program and results shown in table no. 3.2.3. We can replace cement by RHA up to 10%. Because the compressive strength up to 10% replacement of cement is comparatively equal to control mix design. If cement is replaced by RHA more than 10% the loss in compressive strength is comparatively greater than the replacement up to 10%.

:Effect on Split Tensile Strength of Concrete Containing various percentages of RHA.
Table 3.2.4: Split Tensile Strength of RHA Concrete
Mix
Percentage of Cement Replacement
Split Tensile Strength (N/mm2)
7 days
28 Days
M20
0%
1.94
2.71
RHA
5%
2.03
2.94
10%
1.99
2.72
15%
1.89
2.34
20%
1.34
1.97
Split Tensile Strength (N/mm2)
3.5
3
2.5
2
7 days
1.5 28 Days
1
0.5
0
0% 5% 10% 15% 20%
%age of cement replacement by RHA
As per table no.3.2.4 the split tensile strength for replacement of 5% is higher than control mix design and decreases with further increase in RHA but up to 10% of replacement the split tensile strength is still more than the split tensile strength of control mix design.

: Effect on Compressive Strength of Concrete Containing various percentages of WPSA
Table 3.2.5: Compressive Strength of WPSA Concrete
Mix
Percentage of Cement Replacement
Cube Compressive Strength (N/mm2)
7 days
28 Days
CONTROL
0%
20.4
30.93
WPSA
5%
24.07
31.26
10%
22.3
27.59
15%
19.67
25.1
20%
16.89
23.04
Cube Compressive Strength (N/mm2)
35
30
25
20
7 days
15 28 Days
10
5
0
0% 5% 10% 15% 20%
%age of cement replacement by WPSA
As per the results shown in table no.3.2.5 the compressive strength at 7 days for 5% and 10% replacement of cement by WPSA are higher than Control Mix, further increases in % replacement the compressive strength goes on decreases.The compressive strength at 28 Days for 5% replacement is found out to be 31.26 N/mm2which is higher than the compressive strength of 30.93N/mm2 of control mix. For 10% replacement the compressive strength is comparatively nearer to the control mix and for further increases in % replacement the compressive strength decreases.

: Effect on Split Tensile Strength of Concrete Containing various percentages of WPSA
Table 3.2.6: Split Tensile Strength of WPSA Concrete
Mix
Percentage of Cement Replacement
Split Tensile Strength (N/mm2)
7 days
28 Days
M20
0%
1.94
2.71
WPSA
5%
2.34
3.11
10%
2.1
2.92
15%
1.82
2.78
20%
1.69
2.02
3.5
Split Tensile Strength (N/mm2)
3
2.5
2
1.5
7 days
28 Days
1
0.5
0
0%
5%
10%
15%
20%
%age of cement replacement by WPSA
From the results shown in table no 3.2.6 the split tensile strength at 7 Days and 28 Days for 5% and 10% replacement by WPSA is found to be higher than the Control Mix. For 15% the split tensile strength is comparatively equal to the control Mix and for further increase in % replacement of cement the split tensile strength decreases.

: Effect of Compressive Strength of Concrete Containing various percentages of Mix(RHA+ WPSA)
Table 3.3.7: Compressive Strength of Mix (RHA+ WPSA)Concrete
Mix
Percentage of Cement Replacement
Cube Compressive Strength (N/mm2)
7 days
28 Days
CONTROL
0%
20.4
30.93
MIX (RHA+WPSA)
5%
19.84
28.89
10%
18.82
27.66
15%
18.6
24.52
20%
16.03
18.82
Cube Compressive Strength (N/mm2)
35
30
25
20 7 days
15 28 Days
10
5
0
0% 5% 10% 15% 20%
%age of cement replacement by mix (RHA+WPSA)
The results from table no 3.3.7 represents that 10% replacement with Mix(RHA+WPSA) the compressive strength are comparatively equal to Control Mix strength, and further increase in % replacement the strength decreases.

: Effect of Split Tensile Strength of Concrete Containing various percentages of Mix(RHA+ WPSA)
Table 3.2.8: Split TensileStrength of Mix (RHA+ WPSA)Concrete
Mix
Percentage of Cement Replacement
Splitting Tensile Strength (N/mm2)
7 days
28 Days
M20
0%
1.94
2.71
MIX (RHA+WPSA)
5%
1.96
2.95
10%
1.86
2.81
15%
1.71
2.64
20%
1.65
2.24
Split Tensile Strength (N/mm2)
3.5
3
2.5
2
1.5
7 days
28 Days
1
0.5
0
0% 5% 10% 15% 20%
%age of cement replacement by mix (RHA+WPSA)
As per the results from table no.3.2.8. The split tensile strength of 5% replacement of cement with Mix(RHA+WPSA) has higher value than the control mix and 10% replacement has comparatively equal split tensile strength to Control Mix. For the 15% and 20
% the split tensile structure decreases gradually.

GENERAL


CONCLUSIONS
The objective of this experimentation has been to evaluate the possibility of successful replacement of cement with RHA, WPSA and MIX (RHA+WPSA) in concrete.
The conclusion drawn during the experimentations are as follows:

: Split Tensile Strength of Control Concrete, RHA Concrete, WPSA Concrete & Mix(RHA+WPSA) at 28 Days
The compressive strength and split tensile strength increased up to 20% with 5% replacement of WPSA. Further increase in WPSA decreases the strength gradually and up to 10% replacement it can be used as a supplementary material in M20 grade of Concrete.
The above results shows that it is possible to design M20 grade of concrete incorporating with RHA content up to 10%.
As test results shows the Mix (RHA+WPSA) can also be used as a replacement of cement.
Control mix with 5% WPSA showed higher Compressive Strength than Control mix, RHA concrete and Mix(RHA+WPSA) concrete.
The study showed that the early strength of RHA, WPSA and Mix (RHA+WPSA) concrete was found to be less and the strength increased with age.
The workability of RHA,WPSA and Mix(RHA+WPSA) concrete has been found to decrease with the increase in replacements.
Based on the results of Split Tensile Strength test,it is convenient to state that there is substantial increase in Tensile Strength due to the addition of RHA, WPSA and Mix (RHA+WPSA).
Use of Waste Paper Sludge Ash, Rice Husk Ash and Mix (RHA+WPSA) in concrete can prove to be economical as it is non useful waste and free of cost.
Use of waste paper sludge ash in concrete will preserve natural resources that are used for cement manufacture and thus make concrete construction industry sustainable and waste paper sludge can be used as fuel before using its ash in concrete for partial cement replacement and also the disposal problem for paper industries for this waste material is fully solved.
REFERENCES
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