Final review ppt project EFFECTIVENESS OF USING RECYCLED COARSE AGGREGATES IN CONCRETE

Faculty of Engineering
ERODE BUILDER EDUCATIONAL TRUST’S GROUP
OF INSTITUTIONS
DEPARTMENT OF
CIVIL ENGINEERING
ME – Construction Engineering and Management
1

EFFECTIVENESS OF USING RECYCLED
COARSE AGGREGATES IN CONCRETE
THIRD REVIEW 12.04.2014
BATCH 013
UNDER THE GUIDENCES OF
Prof. S.R.Dhamodarasamy, Mr.H.Dineshkumar,
Department of Civil Engineering, Technical Manger,
EBET-I TEEMAGE PRECAST IN
Thesis By
S.Selvaprakash,
M.E CEM (12CEM015),
EBET-I
2

Abstract
Every year concrete industry using 12.6 billion tons of natural
resource. Recycling is most effective method for dealing with the
increasing volume of waste for preservation of the environment.
There is whole range application of recycled materials in both
architectural and civil engineering.
In this paper an experimental program is undertaken which contains
concrete with five different mixes (i) 10mm aggregate replacement
of RCA with admixture, (ii)20mm aggregate replacement of RCA
with admixture, (iii) 20mm and 10mm combined replacement of
RCA . The concrete is replaced with RCA by 20%, 25%, 30%, 35%,
and 40% the compressive strength at 12hours, 3days, 7days, and
28days is determined . The above result are compared with
compressive strength of conventional concrete.
3

METHEDOLOGY
Topic selection
Literature review
Testing material characteristics
Casting of specimens (Replacement by
RCA20%,25%,30%,35%,&40%)
Testing of specimens
Comparison of RCA mix with conventional mix
Conclusion
Report submission
4

OBJECTIVE
 The objective of this study is to find out the mechanical properties of recycled
coarse aggregate in concrete by using compressive strength test
5

Mixing Materials Used for M40
• Cement – OPC 53 grade dalmia cement
• Fly ash
• Fine aggregate
• M- sand
• 10mm aggregate
• RCA 10mm aggregate
• 20mm aggregate
• RCA 20mm aggregate
• Admixture – Gelnium Ace 30
6

Mix proportion
• M40 – 1:1.39:2.375
• Water-Cement ratio- 0.34
• Admixture- Gelnium Ace 30
Material used Percentage in mix For 1m3 (kg)
Cement 89.58 430
Fly Ash 10.42 50
River Sand 54.83 625
M-Sand 45.18 386
20mm Aggregate 30 201
10mm Aggregate 70 469
Admixture 0.55 2.4
7

Test result of Dalmia Cement
Type of test Result Standard value
Fineness 1% Not more than 10%
Consistency 30% by the weight of
cement
-------
Initial setting time 55 mins Not less than 30 minutes
Final setting time 4 hours Not more than 10 hours
8

Test result for River sand and M-sand
Type of test River sand M-sand
Specific Gravity
Standard value (2.5-2.7)
2.64 2.61
Sieve analysis Zone 2 Zone 3
9

Test result for Normal aggregate
Type of test 20mm 10mm Standard value
Specific gravity 2.79 2.75 2.6 to 2.8
Water absorption 2% 1% Not more than 3%
Impact value 15.3 24.3 Not more than 45%
Flakiness index 14.96% 7.05% Not more than 40-
45%Elongation index 31.28% 35.3%
10

Test result for RCA
Type of test 20mm 10mm Standard value
Impact test 28% 26.5% Not more than 45%
Flakiness index 14.23% 25% Not more than 40-
45%
Elongation index 13.33% 37.5%
Water absorption 2.3% 1.8% Not more than 3%
11

SLUMP VALUES FOR MIXES WITH THE
REPLACEMENT OF RCA
12

Replaced size of aggregate Replacement percentage Slump value in mm
20 mm
20% 180
25% 150
30% 140
35% 160
40% 150
10 mm
20% 140
25% 160
30% 185
35% 165
40% 130
20 mm and 10 mm
(combination)
20% 150
25% 160
30% 170
35% 180
40% 150
Conventional concrete - 160
13

Conventional concrete
Curing period Load (kN) Compressive strength
in (N/mm2)
Average in (N/mm2)
12 hours 310.1 13.9 13.5
319.7 14.2
289.2 12.8
3 days 788.8 35 33.7
769.8 34.2
716.9 31.8
7 days 888.5 39.4 45.2
1048.3 46.5
1119.0 49.7
28 days 1137 50.50 49.29
1083 48.13
1108 49.24 14

REPLACEMENT OF RECYCLED COARSE
AGGREGATE
15

16
Replaced size of
aggregate
Replacement Curing period Avg compressive
strength N/mm2
20mm 20%
12 hours
20.33
25% 15.53
30% 19.93
35% 18.12
40% 19.2
10mm 20% 19.5
25% 16.93
30% 15.67
35% 17.62
40% 18.8
20mm&10mm
combined
20% 22.36
25% 17.25
30% 19.63
35% 20.36
40% 20.96

17
Replaced size of
aggregate
strength N/mm2
20mm 20%
3 days
43.33
25% 31.12
30% 42.85
35% 39
40% 41.26
10mm 20% 37.7
25% 42
30% 41.77
35% 34.2
40% 41.7
20mm&10mm
combined
20% 41.7
25% 41.3
30% 40.8
35% 41.33
40% 44.1

18
Replaced size of
aggregate
strength N/mm2
20mm 20%
7 days
48.1
25% 32.99
30% 46.03
35% 46.8
40% 45.86
10mm 20% 48.13
25% 44.1
30% 46.53
35% 43.82
40% 37.3
20mm&10mm
combined
20% 43.2
25% 45.67
30% 43.93
35% 44.63
40% 46.16

19
Replaced size of
aggregate
strength N/mm2
20mm 20%
28 days
53.96
25% 41.6
30% 47.5
35% 58.43
40% 63.43
10mm 20% 55.33
25% 49.2
30% 45.7
35% 55.9
40% 56.4
20mm&10mm
combined
20% 51.87
25% 50.25
30% 53.10
35% 47.25
40% 48.7

Comparison of 12 hours conventional
concrete vs RCA
0
5
10
15
20
25
13.5
20.33
15.53
19.93
18.12
19.2 19.5
16.93
15.67
17.62
18.8
22.36
17.25
19.63
20.36
20.96
CompressivestrengthinMpa
Comparsion of 12 hours
20

Comparison of 3days conventional
concrete vs RCA
0
5
10
15
20
25
30
35
40
45
33.7
43.33
31.12
42.85
39
41.26
37.7
42 41.77
34.2
41.7 41.7 41.3 40.8 41.33
44.1
Comparsion of 3 days
21

Comparison of 7days conventional
concrete vs RCA
0
5
10
15
20
25
30
35
40
45
50
45.2
48.1
32.99
46.03 46.8 45.86
48.13
44.1
46.53
43.82
37.3
43.2
45.67
43.93 44.63
46.16
22

Fig Comparison of 28 days
conventional concrete vs RCA
0
10
20
30
40
50
60
70
49.29
53.96
41.6
47.5
58.43
63.43
55.33
49.2
45.7
55.9 56.4
51.87
50.25
53.1
47.25 48.7
23

PHOTOS
Fig 1 waste concrete
Fig 2 crushed aggregate
concrete waste
24

PHOTOS
Fig 3 curing
Fig 4 compressive
strength machine 25

CONCLUSION
• For the given mix proportion, cubes are casted by Replacing Recycled coarse aggregates in
different percentages. From the Compressive strength test results, it is observed that 40%
Replacement of 10 mm aggregates and also 40% Replacement of 20 mm aggregates in RCA
mix are gain more strength as compared to conventional mix at 28 days. It is also found that,
Compressive strength of 20%, 25% Replacement of 10 mm, 20 mm and combination of 10
mm and 20 mm in RCA mix cubes are comes closer to the compressive strength results of
conventional concrete at 12 hours, 3 days, 7 days, 28 days. Compressive strength is decreased
while replacing recycled coarse aggregates of 30% in mix at 28 days. But the earlier strength
is same as like conventional concrete mix. Finally, overall results are equal to the
conventional concrete results at all ages. It is also noted that, further investigation should be
carried out for using this concrete in structural purposes.
26

REFERENCE
1. IS: 10262-1982, Indian Guidelines for concrete Mix Design, Fifth edition March 1998.
2. Shetty M.S, Concrete Technology Theory and Practice 2008, S.Chand & company Ltd.
3. M Etxeberria, Influence of amount of recycled coarse aggregate and production process on properties
of recycled aggregate concrete, Cement and Concrete Research 37 (2007) 735–742.
4. Khaldoun Rahal, Mechanical properties of concrete with recycled coarse aggregate, Building and
Environment 42 (2007) 407–415.
5. H. Falkner, Bond behaviour between recycled aggregate concrete, Construction and Building Materials
21 (2007) 395–401.
6. A.K. Padmini, Influence of parent concrete on the properties of recycled aggregate concrete,
Construction and Building Materials 23 (2009) 829–836.
7. Valeria Corinaldesi, Mechanical and elastic behaviour of concretes made of recycled-concrete coarse
aggregates, Construction and Building Materials 24 (2010) 1616–1620.
27

Final review ppt project EFFECTIVENESS OF USING RECYCLED COARSE AGGREGATES IN CONCRETE

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