Impact of Conventionally and Non-Conventionally Treated Waste Water on Characteristic Strength of Concrete

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 04 Issue: 08 | Aug -2017 www.irjet.net p-ISSN: 2395-0072
© 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 308
Impact of Conventionally and Non-Conventionally Treated Waste
Water on Characteristic Strength of Concrete
Mr. Nisarg Shankar1, DR. Puttaraju2, Ms. Shree Latha B3, Ritesh L4
1,3 Assistant Professor, Department of Civil Engineering, SJB Institute of Technology, Bengaluru, Karnataka, India
2Principal and Professor, SJB Institute of Technology, Bengaluru, Karnataka, India
4PG Student, Department of Civil Engineering, SJB Institute of Technology, Bengaluru, Karnataka, India
---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - Concrete may be cast into bricks, blocks, and
other relatively small building units, which are used in
concrete construction. Concrete has a great variety of
applications because it meets structural demands and lends
itself to architectural treatment. The consumption of water is
more for the concrete for its mixing and curing. Because ofthe
scarcity of water now a days the alternate use of water for the
concrete is made by considering two types of secondary
treated water that is conventional and non-conventional
treatment. Comparing the compressive strength of normal
grade of concrete made by portable water with the secondary
treated conventional and non-conventional type for different
mix proportions of 0.35, 0.4 and 0.45 water cement ratios for
7,14 and 28 days the optimum typeofsecondarytreatedwater
is used for the concrete for its mix and also for its curing.
Key Words: Concrete, Compressive Strength,
Conventional water, Non-Conventional water, Mix
design, etc
1. INTRODUCTION
Concrete is the most commonlyusedbuildingmaterial.Ithas
the advantage of being formed into any desired shape most
conveniently. It is an artificial stone obtained by mixing
aggregates, cement and waterallowingtheseproducttocure
for hardening. The fine and coarse aggregates in a concrete
mix are the inert, or inactive, ingredients. Cement and water
are the active ingredients. Its essential ingredients are
cement and water which react witheachotherchemically;to
form another material having the useful strength .The
strength of concrete depends upon the quality of its
ingredients, their relative quantities and the manner in
which they are mixed, compacted and cured. Concrete is the
premier constructionmaterial acrosstheworldandthemost
widely used in all types of Civil Engineering works.Concrete,
its total consumption is around twenty billions tones, which
is equivalent to two tones for every living human being.
2. NEED AND OBJECTIVE OF THE STUDY
The first requirement for good concrete is to use a cement
type suitable for the work at hand and have a satisfactory
supply of sand, coarse aggregate, and water. Everything else
being equal, the mix with the best graded, strongest, best
shaped, and cleanest aggregate makes the strongest and
most durable concrete.
2.1 Need for the Study
The need of a sustainably developed and environmental
friendly concrete is aggravated by population growth and
scarcity of water. The world population doubled from 1959
to 1999, increasing from 3 billion to 6 billion .According to
the US Census Bureau, the world population is projected to
reach nine billion by 2043. Thus it is expected that water
recycling and conservation as a necessity.
2.2 Objectives
 To investigate the impact of conventionally and
non-conventionally treated waste water for mixing
and curing of concrete cube.
 To compare the compressive strength of the casted
cubes for tap water, conventionally and non-
conventionally treated waste water.
 To replace the usage of fresh waterbytreatedwater
in the concrete mix.
 To get comparative analysis of test results.
3. MATERIALS AND ITS PROPERTIES
i. Portland cement is the most common type of cement in
general usage.
Normal consistency of cement=31%
Fineness = (Mass of residue in gms/100) =1.8%
Initial setting time of cement sample is found to be 45 min
Final setting time of cement sample is found to be 325 min
Specific gravity of cement = 3.24
ii. Coarse Aggregate
Specific Gravity of coarse aggregate is 2.63
Water Absorption =0.67%
iii. Fine aggregate
Specific Gravity of coarse aggregate is 2.6
The fine aggregate confines to zone I

iv. Water
In this study both conventionally and non-conventionally
treated waste water is used and its properties are given in
the table.
Table 3.1 Basic tests results on treated waste water
Sl
no
Parameters Tap
Water
NC treated
waste water
Tolerable
Limits
01 pH 8.1 7.25 6.8
02 Alkalinity 545mg/l
t
210 mg/lt 250 mg/lt
03 Acidity 28mg/lt 10 mg/lt 50 mg/lt
04 Total
Hardness
600mg/l
t
330 mg/lt ------
05 Total
Suspended
Solids
300mg/l
t
5 mg/lt 2000mg/lt
06 BOD 59mg/lt 7 mg/lt -------
07 COD ------ 26 mg/lt -------
08 DO 15.82mg
/lt
5.8 mg/lt -------
09 Chloride
content
282.99
mg/lt
168mg/lt 2000–
3000
mg/lt
Table 3.2 Basic tests results on conventional treated
waste water
Sl
no
Parameters Conventionally
Treated waste
water
Tolerable
Limits
01 pH 7.2 6.8
02 Alkalinity 210 mg/lt 250 mg/lt
03 Acidity 10 mg/lt 50 mg/lt
04 Total Hardness 330 mg/lt ------
05 Total Suspended
Solids
5 mg/lt 2000mg/lt
06 BOD 7 mg/lt -------
07 COD 26 mg/lt -------
08 DO 5.8 mg/lt -------
09 Chloridecontent 168mg/lt 2000– 3000
mg/lt
Fig 3.1 Cement Fig 3.2 Coarse aggregate
Fig 3.3 Fine aggregate
Fig 3.4 Conventional and Non-conventional water
4. BRIEF DESCRIPTIONSOFTHEPLANTSINCLUDED
IN THE SCOPE OF WORK:
i. Conventional type
The V-Valley sewage treatment plant has been constructed
to treat sewage generated in the western part of the city.
Capacity of the treatment plant is 180MLD. This treatment
plant is situated near Nayandahalli Bangalore-Mysore road.
The treatment processinvolvedinthisplantis“Conventional
two stage trickling filter process”.
ii. Non Conventional type
The 75 MLD secondary sewage treatment plant was
constructed to treat the wastewater. Theplantisdesigned to
treat the sewage of the above said qualities for the
flow/capacities as mentioned below are expected up to the
year 2011. The plant bagged the “ICI-(KBC)-Birla Plus
Endowment Award” for outstanding concrete structure of
Karnataka for the year 2004.

Table 4.1 Characteristics of waste water in treatment
plant (conventional type)
PARAMETERS INFLOW
(mg/l)
OUTFLOW
(mg/l)
Total Suspended
Solids (TSS)
615 <5
BOD 412 <5
COD 820 <20
DO Nill 4
pH (unit less) 6.9 7 to 8
Table 4.2 Characteristics of waste water in treatment
plant (non conventional type)
PARAMETERS INFLOW
(mg/l)
OUTFLOW
(mg/l)
Total Solids 1050 520
Total Suspended
Solids (TSS)
230 7
BOD 350 7.25
COD 608 42
Chlorides (as Cl) 137 128
Sulphates (as SO4) 42 16
pH (unit less) 7.18 7.40
5. CONVENTIONALLY AND NON-CONVENTIONALLY
TREATED WATER PROCESS
The major aim of waste water treatment is to remove as
much of the suspended solids as possible before the
remaining water, called effluents is discharged back to the
environment. As solid materials decays, it uses up oxygen
which is needed by the plants and animals leaving in the
water. Primary treatment removes above60%ofsuspended
solids from waste water. This treatment also involves
aerating the waste water, to put oxygen back in. Secondary
treatment removes more than 90% of suspended solids.
5.1 Conventionally treated water process
Pre Treatment Units:
 Screening
 Gritting
 Primary clarifiers
 Primary bio-filters
 Recirculation pump house
 Sludge pumping
Secondary Treatment Units:
 Secondary bio-filters
 Secondary clarifiers
 Sludge digesters
 Sludge pumping
 Sludge drying bed
5.2 Non-Conventionally treated water process
Fig 5.1 Flow chart showing Operational Units at
Mailasandra 75 MLD STP
6. MIX DESIGN
Mix design is carried out as per IS: 10262-2009 for M20
concrete by varying water cement ratio (0.4&0.45). The
process of selecting suitable ingredients of concrete and
determining their relative amounts with the objective of
producing a concrete of the required, strength, durability,
and workability as economically as possible, is termed the
concrete mix design.
Design stipulations for proportioning
 Grade designation : M20
 Type of cement : OPC 53 grade confirming to IS
8112
 Maximum nominal size of aggregates 20 mm
 Minimum cément content : 300 kg/m3
 Maximum water cement ratio : 0.5
 Workability : (25-50)mm (slump)

 Exposure condition : Moderate
 Degree of supervision : Good
 Type of aggregate : Crushed angular aggregate
 Maximum cement content : 450 kg/m3
Table 6.1 Mix proportions of different w/c
WATER
CEMENT
RATIO
0.35 0.4 0.45
CEMENT
(kg/m3)
450 450 413.33
WATER (liters)
186 186 186
FINE
AGGREGATE
(kg/m3)
649.35 666.9 696.618
COARSE
AGGREGATE
(kg/m3)
1118.407 1100.655 1102.15
MIX RATIO 1 : 1.44 :
2.48
1 : 1.48 :
2.44
1: 1.68 :
2.66
7. MIXING, CASTING AND CURING
All the ingredients required for the preparation of concrete
were effectively mixed manually (hand mixing) on a large
steel tray. First, all the dry ingredients such as cement, fine
aggregates, coarse aggregates and polyester fibers and steel
fibers were mixed for 3 minutes, after which water was
added based on the quantity determinedfromthemixdesign
and then all the ingredients weremixedthoroughlyforabout
4 minutes.
15 concrete cubes will be casted according to the mix
proportions and by varying water cement ratio
(0.35,0.4&0.45). For M20 concrete different combination of
concrete mixing will be carried out as given below
5 Specimens are casted using 100% tap water.
5 Specimens are casted using 100% conventionally treated
waste water.
5 Specimens are casted using 100% non-conventionally
treated waste water.
Curing will be done by immersing the specimens in curing
ponds of tap water and treated water separately. Three
curing ages are selected i,e 7,14,28 days. Three concrete
blocks are tested for compressive strength at single ag
Fig 7.1 Mixing Fig 7.2 Casting
Fig 7.3 Curing
Table 7.1 Details of number of cubes
fck W/C Portable
Water
Convention
water
Non
Convention
water
No
of
Cube
M
20
7 14 28 7 14 28 7 14 28
0.35 5 5 5 5 5 5 5 5 5 45
0.4 5 5 5 5 5 5 5 5 5 45
0.45 5 5 5 5 5 5 5 5 5 45
Total Number Of Cubes 135
8. TEST RESULTS
Table 8.1 Average Compressive strength of concrete (Tap
water as mixing and curing water)
Water
cement
ratio
Curing
age
(days)
Sl
no
Weight
of cube
(kg)
fck
(N/mm2)
Avg
comp
strength
(N/mm2)
0.35
7 1 8.18 18.44 18.538
2 8.04 18.8
3 7.94 17.86
4 8.2 19.02
5 8.02 18.57
14 1 8.14 23.64 22.806
2 7.96 23.02
3 8.0 23.24
4 8.14 22

5 8.18 22.13
28 1 8.1 28.17 29.47
2 7.48 31.06
3 8.1 28.97
4 8 30.35
5 8.25 28.8
Table 8.2 Compressive strength of CTW and NCTW
concrete
W/C Curing
Weight Of
Cube
Fck Of
CTW
Fck Of
NCTW
0.35
7 7.8 13.18 14.16
14 7.8 17.74 17.78
28 7.7 27.52 27.85
Chart 8.1 Compressive strength at 0.35w/c
Water
cement
ratio
Curing
age
(days)
Sl
no
Weight
of cube
(kg)
Fck
(N/mm2)
Avg
comp
strength
(N/mm2)
0.4
7 1 8.04 17.91 17.196
2 7.84 17.15
3 7.88 17.55
4 7.72 16.57
5 7.94 16.8
14 1 7.84 20.35 19.87
2 7.74 19.33
3 7.9 19.64
4 7.78 20.57
5 7.88 19.466
28 1 7.82 29.68 28.464
2 7.88 27.06
3 7.74 29.02
4 7.76 28.08
5 8.1 28.48
concrete
W/C Curing
Weight Of
Cube
Fck Of
CTW
Fck Of
NCTW
0.4
7 7.8 16 16.19
14 7.8 19.24 20.33
28 7.9 25.58 25.98
Water
cement
ratio
Curing
age
(days)
Sl
no
Weight
of cube
(kg)
Fck
(N/mm2)
Avg
comp
strength
(N/mm2)
0.45
7 1 8.04 15.37 14.928
2 8.2 15.91
3 8.32 14.75
4 7.82 14.17
5 7.58 14.44
14 1 7.76 18.755 18.28
2 7.68 18.488
3 8.04 18.62
4 7.78 17.86
5 8.1 17.68
28 1 7.7 26.57 26.972
2 8.32 27.2
3 7.78 28.35
4 8.08 26.97
5 7.88 26.77

concrete
W/C Curing
Weight Of
Cube
Fck Of
CTW
Fck Of
NCTW
0.45 7 7.8 17.67 16.95
14 7.8 20.46 21.17
28 7.7 25.02 25.8
Fig 8.1 Compressive testing machine
9. CONCLUSIONS
 The normal consistency,initial andfinal settingtime
of cement paste by mixing Secondary treated waste
water Within the IS limit.
 The compressive strength of portabletreatedwater
and secondary treated water is compared in all the
water cement ratios.
 Tests performed in this study suggest that Non
conventionally treatedwaste waterisaninteresting
candidate for using concrete for applications in the
mixture and curing.
 The compressive strength of non conventionally
treated water concrete of 0.35,0.40 and 0.45 water
cement ratio is more compared to the
conventionally treated water in all the ratios.
 For 0.45 water cement ratio the compressive
strength of non conventionally treated waste water
is almost same as the portable treated water for 14
and 28 days.
 When compared to three water cement ratios
(0.35,0.4 and 0.45) 0.45 water cement ratioisfound
to be efficient in using it in concrete mix and curing
for treated water.
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8. Oue Soon Lee, MohidRazmanSalim, Mohammad
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Impact of Conventionally and Non-Conventionally Treated Waste Water on Characteristic Strength of Concrete