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

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EFFECTIVENESS OF USING RECYCLED COARSE AGGREGATES IN CONCRETE

THIRD REVIEW 12.04.2014BATCH 013

UNDER THE GUIDENCES OF

Prof. S.R.Dhamodarasamy, Mr.H.Dineshkumar, Department of Civil Engineering, Technical Manger, EBET-I TEEMAGE PRECAST IN

Thesis ByS.Selvaprakash,

M.E CEM (12CEM015),EBET-I

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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.

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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

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OBJECTIVE

The objective of this study is to find out the mechanical properties of recycled coarse

aggregate in concrete by using compressive strength test

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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

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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

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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

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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

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Test result for Normal aggregateType 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%

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Test result for RCAType 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%

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SLUMP VALUES FOR MIXES WITH THE REPLACEMENT OF RCA

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

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Conventional concreteCuring 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

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REPLACEMENT OF RECYCLED COARSE AGGREGATE

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Replaced size of aggregate

Replacement Curing period Avg compressive strength N/mm2

20mm 20%

12 hours

20.3325% 15.5330% 19.9335% 18.1240% 19.2

10mm 20% 19.525% 16.9330% 15.6735% 17.6240% 18.8

20mm&10mm combined

20% 22.3625% 17.2530% 19.6335% 20.3640% 20.96

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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

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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

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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

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Comparison of 12 hours conventional concrete vs RCA

conve

ntional

conc

rete

20mm 20

%

20mm 25

%

20mm 30

%

20mm 35

%

20mm 40

%

10mm 20

%

10mm 25

%

10mm 30

%

10mm 35

%

10mm 40

%

20&10

mm 20%

20&10

mm 25%

20&10

mm 30%

20&10

mm 35%

20&10

mm 40%0

5

10

15

20

25

13.5

20.33

15.53

19.9318.12

19.2 19.5

16.9315.67

17.6218.8

22.36

17.25

19.6320.36 20.96

Comparsion of 12 hours

Com

pres

sive

stre

ngth

in M

pa

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Comparison of 3days conventional concrete vs RCA

conve

ntional

concre

te

20mm 20

%

20mm 25

%

20mm 30

%

20mm 35

%

20mm 40

%

10mm 20

%

10mm 25

%

10mm 30

%

10mm 35

%

10mm 40

%

20&10

mm 20%

20&10

mm 25%

20&10

mm 30%

20&10

mm 35%

20&10

mm 40%0

5

10

15

20

25

30

35

40

45

33.7

43.33

31.12

42.85

3941.26

37.7

42 41.77

34.2

41.7 41.7 41.3 40.8 41.3344.1

Comparsion of 3 days

Com

pres

sive

stre

ngth

in M

pa

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Comparison of 7days conventional concrete vs RCA

conve

ntional

concre

te

20mm 20

%

20mm 25

%

20mm 30

%

20 m

m 35%

20mm 40

%

10mm 20

%

10mm 25

%

10mm 30

%

10mm 35

%

10mm 40

%

20&10

mm 20%

20&10

mm 25%

20&10

mm 30%

20&10

mm 35%

20&10

mm 40%

0

5

10

15

20

25

30

35

40

45

5045.2

48.1

32.99

46.03 46.8 45.8648.13

44.146.53

43.82

37.3

43.245.67

43.93 44.6346.16


Com

pres

sive

stre

ngth

in M

pa

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Fig Comparison of 28 days conventional concrete vs RCA

conv

entio

nal c

oncre

te

20mm 20

%

20mm 25

%

20mm 30

%

20mm 35

%

20mm 40

%

10mm 20

%

10mm 25

%

10mm 30

%

10mm 35

%

10mm 40

%

20&10

mm 20%

20&10

mm 25%

20&10

mm 30%

20&10

mm 35%

20&10

mm 40%0

10

20

30

40

50

60

70

49.2953.96

41.6

47.5

58.4363.43

55.33

49.245.7

55.9 56.451.87 50.25

53.1

47.25 48.7


Com

pres

sive

stre

ngth

in M

pa

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PHOTOS

Fig 1 waste concrete

Fig 2 crushed aggregate concrete waste

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PHOTOS

Fig 3 curing

Fig 4 compressive strength machine

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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.

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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.

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Thank you