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ISSN: 2321-9653
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Ijraset Journal For Research in Applied Science and Engineering Technology

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Enhancing the Properties of Stone Mastic Asphalt Using Bagasse and Coir Fiber as Additives

Authors: Ayush Goswami, Mahesh Ram Patel

DOI Link: https://doi.org/10.22214/ijraset.2023.49460

Certificate: View Certificate

Abstract

Stone mastic asphalt is recognized for its remarkable durability, making it a crucial component for constructing pavements on aerital roads, which must withstand heavy traffic. When road authorities choose asphalt for main roads under these conditions, they often prefer stone mastic asphalt. The most crucial aspect of this type of asphalt is ensuring that SMA is implemented correctly, as it has excellent performance characteristics. However, improper implementation can lead to changes in performance. European countries favor SMA for its outstanding performance. There have been recent ad-vancements in SMA methods, including computation and artificial intelligent systems such as artificial neural network and fuzzy logic (ANN and FL) in various engineering fields. It is vital to consider the resilient module when discussing fuzzy logic and SMA performance characteristics. Air voids, bulk density, and permeability coefficient are some of the critical SMA features that should be evaluated when applying fuzzy logic. In the initial stages, fuzzy logic utilizes weighted average operations to input data, and the output undergoes assessment by a mathematical model. Through experimental study, ap-plying fuzzy logic can enhance the accuracy of evaluation.

Introduction

I. INTRODUCTION

Infrastructure development in India has identified the construction of new roads and strengthening of bridges as a major focus area. To create a strong and sustainable wearing course for bridge construction, mastic asphalt is the preferred material due to its desirable properties. This material is made up of a mixture of coarse aggregate, sand, limestone fine aggregate, filler, and bitumen. It has a low void content and the binder content is adjusted to completely fill the voids. Mastic asphalt is pourable and requires no compaction on site, making it an ideal surfacing material for bridges. However, the high percentage of bitumen content can cause drain down during mixture and transportation.

Stone matrix asphalt (SMA), also known as stone mastic asphalt, is a type of high-quality asphalt that was originally developed in Europe to resist rutting and improve durability in heavy traffic road. SMA has a high content of coarse aggregate that interlocks to create a stone skeleton, providing deformation resistance. The skeleton is filled with a bitumen and filler mastic that includes fibers to stabilize the bitumen and prevent drainage during transport and placement. SMA consists of coarse aggregate, filler, binder, and fiber. Its design is largely determined by the selection of aggregate grading and the type and proportion of filler and binder. SMA has improved rut resistance, durability, and good fatigue and tensile strength. It is commonly used for surface courses on high volume roads due to its benefits of wet weather friction, lower tire noise, and less severe reflective cracking. Mineral fillers and additives are used to prevent asphalt binder drain-down during construction and increase mix durability.

A. Stone Mastic Asphalt

Stone mastic asphalt (SMA) is a type of asphalt mixture used for road construction and surfacing. It is a high-quality mix that consists of large stones, sand, filler, and bitumen binder. The large stones in the mix provide a high level of durability and resistance to wear and tear, while the sand and filler help to create a smooth, even surface. The use of SMA results in a pavement that is more resistant to deformation, cracking, and potholes compared to traditional asphalt mixes. It also has improved skid resistance and can reduce noise levels compared to conventional asphalt surfaces. SMA is typically used for high-traffic roads and motorways, where a durable and long-lasting surface is essential. It can also be used in more demanding applications, such as airport runways, industrial estates, and heavy-duty truck parks.

Advantages and Uses of Stone Mastic Asphalt:

Stone mastic asphalt is a type of asphalt mix that is commonly used in paving and construction projects. Some of the main uses and advantages of stone mastic asphalt include:

  1. Road Paving: Stone mastic asphalt is widely used in the construction of roads, highways, and other pavements. It provides a durable and long-lasting surface that can withstand heavy traffic and weather conditions.
  2. Improved Durability: Stone mastic asphalt contains larger stones and a higher proportion of bitumen, which makes it more resistant to damage and wear. This makes it an ideal choice for high-traffic areas and areas exposed to harsh weather conditions.
  3. Better Skid Resistance: The larger stones in stone mastic asphalt provide improved skid resistance, making it safer for drivers and pedestrians.
  4. Reduced Noise Levels: Stone mastic asphalt is known for its noise-reducing properties. This makes it an ideal choice for residential and commercial areas that are close to busy roads.
  5. Easy Maintenance: Stone mastic asphalt is easy to maintain and repair, making it a cost-effective choice for long-term projects.
  6. Cost-Effective: Compared to other asphalt mixes, stone mastic asphalt is relatively affordable and can be used for a range of projects, making it a cost-effective option for many construction and paving projects.

As we know now the stone mastic asphalt is a versatile and durable paving material that provides a range of benefits, making it a popular choice for a variety of projects

B. Bagasse

Bagasse is the fibrous residue that remains after sugarcane or other plant materials have been crushed to extract their juice or sap. It is primarily composed of cellulose, hemicelluloses, and lignin and is used as a biofuel source for the production of energy, as well as for manufacturing paper, building materials, and animal feed.

In India, bagasse is a major agricultural waste generated by the sugarcane industry. According to the Ministry of New and Renewable Energy, the country produces about 27 million tonnes of bagasse every year. While some of it is used as a fuel in the sugar mills to generate electricity and steam, a significant portion of it remains unutilized and is either burned or disposed of in landfills, leading to environmental problems.

However, in recent years, there has been increasing interest in using bagasse for various purposes such as production of biofuels, animal feed, and paper pulp. Additionally, bagasse is being explored as a potential reinforcement material in composite materials, including in the construction of low-cost housing. The Indian government has also initiated various schemes and incentives to encourage the utilization of bagasse and other agricultural waste for renewable energy production and other applications.

Hence our aim is to use Bagasse as a reinforcing matial in SMA.

C. Coir Fiber

Coir fiber is a natural fiber extracted from the husk of coconut fruit. In Stone Matrix Asphalt (SMA), coir fibers are used as a reinforcement material to improve the mechanical properties and durability of the asphalt pavement. The addition of coir fibers to the SMA mix helps to increase the tensile strength, reduce the risk of cracking, and enhance the resistance to permanent deformation.

Coir fibers are particularly useful in hot and humid climates, as they have a high resistance to moisture absorption and are less likely to break down in such conditions. The use of coir fibers in SMA also has environmental benefits as it reduces the reliance on synthetic fibers, which can be harmful to the environment.

Overall, the addition of coir fibers to SMA has been found to result in improved pavement performance, particularly in terms of rutting resistance and cracking resistance, making it an attractive option for road construction and rehabilitation projects.

II. MATERIALS USED

The Following Materials were used:

  • Cement: Ordinary Portland Cement

Basic Materials and There Properties

The materials used are as follows.

  • Aggregates
  • Bituminous Binder
  • Mineral Filler
  • Bamboo Fiber
  • Coir Fiber

A. Aggregate

The granular component of bituminous concrete mixtures, known as aggregate, constitutes a significant portion of the mixture's weight, up to 90-95%, and contributes heavily to the load bearing and strength characteristics of the pavement. As a result, it is critical to monitor the quality and physical properties of the aggregates to ensure a well-functioning pavement. The necessary properties for suitable aggregates in pavement are outlined below:

  1. Aggregates should exhibit minimal plasticity to avoid issues like swelling and bitumen adhesion caused by clay fines, which can lead to stripping problems. Clay lumps and friable particles must not exceed 1%.
  2. The ability to resist weathering or durability should be evaluated through sulphate soundness testing.
  3. The ratio of dust to asphalt cement, by mass, should be no more than 1.2 and no less than 0.6.
  4. AASHTO T-209 is the recommended method for determining the maximum specific gravity of bituminous concrete mixes.
  5. Aggregates are of 2 types. i.e.

a. Coarse Aggregate (CA)

For this study, the coarse aggregate used was naturally occurring and was retained on a 4.75mm IS sieve. To be suitable for use, coarse aggregate must be screened, crushed rock with an angular shape, free of dust particles, clay, vegetation, and organic matter. It should also possess the following characteristics:

  • The Los Angeles Abrasion value should not exceed 25% (according to ASTM C131).
  • The weighted average weight loss in the magnesium sulphate soundness test should not be higher than 18% (according to AASTHO T 104).
  • The flakiness index should not exceed 25% (according to MS 30).
  • The water absorption should not be more than 2% (according to MS30).
  • The polished stone value should not be less than 40%

b. Fine Aggregate (FA)

For this study, naturally occurring fine aggregate (natural sand) that passes through a 4.75mm IS sieve was utilized. As for the fine aggregate, it must be sourced from clean, screened quarry dust that is free of clay, loam, vegetation, or organic matter. The fine aggregate should possess the following properties:

  • The angularity must not be less than 45% as per ASTM C 1252.
  • The methylene blue content should not exceed 10 mg/g according to the Ohio Department of Transportation Standard Test Method.
  • The weighted average weight loss in the magnesium sulphate soundness test should not exceed 20% (AASTHO T 104).
  • Water absorption should not be more than 2% (MS30).

Table:Physical Properties of Aggregates

Sl. No.

Physical Parameters

Results

Permissible Value

1.

Flakiness Index

13.63 %

Not to exceed 15%

2.

Elongation Index

12.71 %

Not to exceed 15%

3.

Los Angeles Abrasion Test

16.32 %

Not to exceed  30%

4.

Impact Value Test

15.55 %

Not to exceed 30%

5.

Specific Gravity

2.64

Range between 2.6 to 2.7

B. Bitumen

In this research, the type of asphalt binder used is VG30. The bitumen utilized must possess certain characteristics.

  1. The selection of the bitumen grade for pavement construction must consider the prevailing weather conditions and past performance records.
  2. It is advisable that the supplier's certification and testing results, along with the State project's verification samples, be used to determine the suitability of the bitumen. The acceptance procedures must provide prompt information on the physical properties of the bitumen.
  3. The physical properties of the bitumen used in pavements are crucial and should be evaluated by the central laboratory or supplier tests. Each State must have specific requirements for each property, except for specific gravity.

Table: Physical Properties of Bitumen

Sl. No.

PROPERTY

RESULT

Permissible limit

1.

Specific Gravity(at 270C)

0.995

0.99-1.05

2.

Penetration Value(at 250C)

46.23 mm

60-70 mm

3.

Ductility(at 250C)

104.5 cm

Minimum 100 mm

4.

Softening Point

51ºC

45°C to 52°C

5.

Flash Point

267 ºC

not be less than 220°C

6.

Fire Point

345 ºC

not be less than 260°C

Table: gradation of aggregates

Sieve Size

(in mm)

Wt. retained

(grams)

% Wt.

Retained

Cumulative % retained(by weight)

Cumulative % passing(by weight)

26.5

-

-

-

-

19

0

0

0

100

13.2

60

5

5

95

9.5

384

32

37

63

4.75

468

39

76

24

2.36

36

3

79

21

1.18

24

2

81

19

0.600

36

3

84

16

0.300

12

1

85

15

0.75

60

5

90

10

Pan

120

10

100

0

So the aggregates of different grades were sieved through different IS Sieves and they were kept in different containers with proper marking. The Naturally available Sand used is of Zone-II.

C. Mineral Filler

The fillers constitutes 8% to 12% of the mixture. In this study we have used 20% hydrated lime and 80% fine aggregates passing through 75µm for good binding properties.

Table: Specific Gravity of Filler Materials

Sl. No.

Filler

Specific Gravity

1.

Hydrated Lime

2.25

2.

Fine Aggregates

2.70

D. Coir Fibres and Bamboo

In this study two types of fibres were used Bamboo and Coir Fibre. 0.3% by weight of aggregate has been added to minimize the drain down effects.

Table: Specific Gravity of Fibres

Sl. No.

FIBRE

SPECIFIC GRAVITY

1.

Bamboo

0.685

2.

Coir

0.684

III. METHODOLOGY

Table: Amounts of raw materials

Polythene %

Wt. of Fibre(gm)

Wt. of Aggregate (gm)

MIX 1

3.6

1152

MIX 1

3.6

1152

MIX 1

3.6

1152

MIX 2

3.6

1140

MIX 2

3.6

1140

MIX 2

3.6

1140

MIX 3

3.6

1134

MIX 3

3.6

1134

MIX 3

3.6

1134

MIX 4

3.6

1128

MIX 4

3.6

1128

MIX 4

3.6

1128

MIX 5

3.6

1116

MIX 5

3.6

1116

MIX 5

3.6

1116

A. Void Analysis

The samples were weighed in air and also immersed in water so that water replaces the air present in the voids of specimens. But some amount of water will be absorbed by the aggregates which give flawed results. Therefore, the samples were coated with paraffin wax so that it seals the mix completely and checks the absorption of liquid into it.

 

B. Mix Volumetric

The volumetric parameters (refer Figure 4.5) are to be checked from the Marshall samples, prior to Marshall Test. The following are equations which would be used to determine volumetric parameters such as VMA, VA, VFB etc. and absorbed bitumen content (Pab). The absorbed bitumen is a important parameter, which is ignored in bituminous mix design in many cases (Chakroborty & Das, 2005)

Theoretical Maximum Specific Gravity of the mix(Gmm)

Gmm=Wt of mix/Volume of the (mix air voids)

Bulk specific gravity of the mix (Gmb)

Gmb=Wt of mix/Bulk volume of the sample Percentage of the aggregate present(Ps)

Ps=Wt of aggregate/Wt of mix

Air voids (VA)

VA= [(Wt of mix/Gmb-Wt of mix/Gmm)/(Wt of mix/Gmb)]*100

Bulk specific gravity of aggregate (Gsb)

Gsb=Wt of aggregate/Vol of(aggregate mass+air void in aggregate+absorbed bitumen)

Voids in mineral aggregates (VMA)

VMA= [(Wt of mix/Gmb-Wt of mix*Ps/Gsb)/(Wt of mix/Gmb)

Table: Gradation table with Fibre

Sieve Size (mm)

% Retained

4%

5%

5.5%

6%

7%

13.2

5

57.42

56.82

56.52

56.22

55.62

9.5

32

367.49

363.65

361.72

359.80

355.97

4.75

39

447.88

443.196

440.86

438.52

433.84

2.36

4

45.94

45.45

45.22

44.98

44.50

1.18

3

34.45

34.09

33.91

33.73

33.37

0.6

2

22.97

22.72

22.60

22.49

22.25

0.3

0

0

0

0

0

0

0.75

5

57.42

56.82

56.52

56.22

55.62

Filler

10

114.84

113.64

113.04

112.44

111.24

Binder

 

48

60

66

72

84

Fibre

 

3.6

3.6

3.6

3.6

3.6

 

Table: Gradation table without Fibre

Sieve Size (mm)

% Retained

4%

5%

5.5%

6%

7%

13.2

5

57.6

57

56.7

56.40

55.8

9.5

32

368.64

364.80

362.88

360.96

357.12

4.75

39

449.28

444.60

442.26

439.92

435.24

2.36

4

46.08

45.60

45.36

45.12

44.64

1.18

3

34.56

34.20

34.02

33.84

33.48

0.6

2

23.04

22.80

22.68

22.56

22.32

0.3

0

0

0

0

0

0

0.75

5

57.6

57

56.7

56.40

55.80

Filler

10

115.20

114

113.40

112.80

111.60

Binder

 

48

60

66

72

84

Table: Correction Factors

Volume of Specimen (cm3)

Average thickness of Specimen (mm)

Correction Factors

445-455

55.50

1.26

456-469

57.30

1.19

470-481

58.68

1.14

482-494

60.35

1.09

495-507

61.91

1.04

508-521

63.48

1

522-534

65.20

0.96

535-545

66.60

0.93

546-558

68.40

0.89

559-572

69.70

0.83

Table: Calculation of Parameters without fibres

Sample Nos

Bitumen Content (%)

Wt before paraffin coating

(gm)

Wt after paraffin coating

(gm)

Wt in water (gm)

Ht (mm)

Wt of Aggregate Mix(gm)

Flow (mm)

Load Taken (KN)

A-1

4

1194

1212

709

64.30

1152

3.22

296

A-2

4

1185

1197

697

64.55

1152

2.52

256

A-3

4

1187

1202

703

65.10

1152

3.11

287

B-1

5

1179

1197

707

62.57

1140

4.20

351

B-2

5

1196

1198

701

63.15

1140

4.68

322

B-3

5

1185

1207

716

63.18

1140

3.58

292

C-1

5.5

1181

1192

747

57.20

1134

3.84

221

C-2

5.5

1177

1186

756

57.12

1134

4.29

279

C-3

5.5

1182

1190

758

61.10

1134

4.89

329

D-1

6

1201

1204

740

58.42

1128

4.64

272

D-2

6

1193

1201

754

57.35

1128

4.47

328

D-3

6

1184

1192

750

58.49

1128

5.43

254

E-1

7

1180

1209

705

61.20

1116

5.52

448

E-2

7

1182

1211

707

60.23

1116

5.67

476

E-3

7

1188

1214

712

60.45

1116

4.78

482

Table: Calculation of Parameters with bamboo fibres

Sample Nos

Bitumen Content (%)

Wt before paraffin coating

(gm)

Wt after paraffin coating

(gm)

Wt in water (gm)

Ht (mm)

Wt of Aggregate Mix(gm)

Flow (mm)

Load Taken (KN)

A-1

4

1185

1195

710

65.30

1152

3.63

357

A-2

4

1182

1187

708

63.25

1152

4.15

374

A-3

4

1180

1187

704

62.50

1152

3.10

428

B-1

5

1198

1206

715

57.20

1140

4.89

402

B-2

5

1195

1204

711

58.30

1140

5.24

332

B-3

5

1188

1197

713

57.40

1140

3.88

394

C-1

5.5

1175

1186

746

57.40

1134

4.45

477

C-2

5.5

1175

1185

742

57.40

1134

4.35

482

C-3

5.5

1196

1206

755

57.60

1134

5.18

420

D-1

6

1195

1205

759

59.50

1128

4.18

413

D-2

6

1201

1210

741

58.40

1128

5.45

387

D-3

6

1204

1215

750

60.60

1128

4.48

337

E-1

7

1180

1190

750

57.45

1116

5.18

373

E-2

7

1182

1189

754

57.20

1116

4.94

368

E-3

7

1178

1184

746

63.40

1116

5.67

322

Table: Calculation of Parameters with Coir fibres

Sample Nos

Bitumen Content (%)

Wt before paraffin coating

(gm)

Wt after paraffin coating

(gm)

Wt in water (gm)

Ht (mm)

Wt of Aggregate Mix(gm)

Flow (mm)

Load Taken (KN)

A-1

4

1143

1173

678

56.50

1152

2.89

264

A-2

4

1188

1218

685

57.40

1152

2.85

258

A-3

4

1152

1182

684

56.30

1152

2.76

273

B-1

5

1182

1199

673

57.50

1140

3.16

272

B-2

5

1187

1207

687

58.40

1140

3.24

258

B-3

5

1192

1210

689

57.50

1140

3.35

254

C-1

5.5

1201

1214

684

57.40

1134

3.65

278

C-2

5.5

1180

1191

690

56.70

1134

3.84

303

C-3

5.5

1186

1195

691

57.50

1134

3.79

301

D-1

6

1195

1204

695

58.50

1128

4.15

239

D-2

6

1184

1193

691

57.40

1128

4.36

228

D-3

6

1188

1198

695

58.70

1128

4.65

242

E-1

7

1170

1205

668

58.40

1116

4.57

203

E-2

7

1191

1199

682

56.50

1116

4.62

209

E-3

7

1187

1198

680

58.50

1116

4.74

219

C. Marshall Testing

The Marshall test was done as procedure outlined in ASTM D6927 – 06.

  1. Marshall Stability Value: It is defined as the maximum load at which the specimen fails under the application of the vertical load. It is the maximum load supported by the test specimen at a loading rate of 50.8 mm/minute (2 inches/minute). Generally, the load was increased until it reached the maximum & then when the load just began to reduce, the loading was stopped and the maximum load was recorded by the proving ring.
  2. Marshall Flow Value: It is defined as the deformation undergone by the specimen at the maximum load where the failure occurs. During the loading, an attached dial gauge measures the specimen's plastic flow as a result of the loading. The flow value was recorded in 0.25 mm (0.01 inch) increments at the same time when the maximum load was recorded.

Two readings were taken from the dial gauge i.e. initial reading (I) & final reading (F) The Marshall Flow Value (f) is given by

The Marshall Stability Values are shown in Table – 4.9, 4.10 and 4.11 The Marshall Flow Values

Table: Calculation of marshall design Parameters without fibres

Sample Nos

Bitumen Content (%)

Bulk volume

of sample

Gmb

Ps

Gmm

VA (%)

Gsb

VMA (%)

Stability (KN)

A-1

4

504

2.404762

0.950495

2.62

8.215194

2.73

16.2742

8.791209

A-2

4

501

2.389222

0.962406

2.62

8.808338

2.73

15.77285

7.603208

A-3

4

501

2.399202

0.958403

2.62

8.42742

2.73

15.77285

8.523909

B-1

5

491

2.437882

0.952381

2.56

4.770239

2.74

15.26306

10.42471

B-2

5

500

2.396

0.951586

2.56

6.40625

2.74

16.78832

9.56341

B-3

5

491

2.458248

0.94449

2.56

3.974669

2.74

15.26306

8.672409

C-1

5.5

442

2.696833

0.951342

2.93

7.957932

3.59

28.53452

6.563707

C-2

5.5

431

2.75174

0.956155

2.93

6.083954

3.59

26.71057

8.286308

C-3

5.5

431

2.761021

0.952941

2.93

5.767205

3.59

26.71057

9.77131

D-1

6

466

2.583691

0.936877

2.89

10.59893

3.24

25.2901

8.078408

D-2

6

445

2.698876

0.939217

2.89

6.613273

3.24

21.76446

9.74161

D-3

6

446

2.672646

0.946309

2.89

7.520909

3.24

21.93988

7.543808

E-1

7

507

2.384615

0.923077

2.55

6.485671

2.79

21.10454

13.30561

E-2

7

507

2.38856

0.921552

2.55

6.330974

2.79

21.10454

14.13721

E-3

7

502

2.418327

0.919275

2.55

5.163659

2.79

20.31873

14.31541

Table: Calculation of marshall design Parameters with coir fibres

Sample Nos

Bitumen Content (%)

Bulk volume

of sample

Gmb

Ps

Gmm

VA (%)

Gsb

VMA (%)

Stability (KN)

A-1

4

496

2.364919

0.982097

2.98

20.64029

3.16

26.50061

7.840808

A-2

4

534

2.280899

0.945813

2.98

23.45977

3.16

31.73091

7.662608

A-3

4

500

2.364

0.974619

2.98

20.67114

3.16

27.08861

8.108108

B-1

5

525

2.28381

0.950792

2.58

11.48025

2.75

21.03896

8.078408

B-2

5

521

2.316699

0.94449

2.58

10.20548

2.75

20.43273

7.662608

B-3

5

520

2.326923

0.942149

2.58

9.809183

2.75

20.27972

7.543808

C-1

5.5

531

2.286252

0.934102

2.92

21.70369

3.26

34.49101

8.256608

C-2

5.5

504

2.363095

0.952141

2.92

19.07208

3.26

30.9816

8.999109

C-3

5.5

503

2.375746

0.948954

2.92

18.63885

3.26

30.84438

8.939709

D-1

6

509

2.365422

0.936877

2.95

19.81619

3.24

31.60154

7.098307

D-2

6

502

2.376494

0.945516

2.95

19.44088

3.24

30.64778

6.771607

D-3

6

504

2.376984

0.941569

2.95

19.42427

3.24

30.92299

7.187407

E-1

7

535

2.252336

0.926141

2.87

21.52138

3.22

35.21797

6.029106

E-2

7

519

2.310212

0.930776

2.87

19.50481

3.22

33.22084

6.207306

E-3

7

517

2.317215

0.931553

2.87

19.26081

3.22

32.9625

6.504307

Table: Calculation of marshall design Parameters with bamboo fibres

Sample Nos

Bitumen Content (%)

Bulk Volume

Of sample

Gmb

Ps

Gmm

VA (%)

Gsb

VMA (%)

Stability (KN)

A-1

4

486

2.458848

0.964017

2.97

17.21051

3.15

24.75015

10.60291

A-2

4

480

2.472917

0.970514

2.97

16.73681

3.15

23.80952

11.10781

A-3

4

484

2.452479

0.970514

2.97

17.42494

3.15

24.4392

12.71161

B-1

5

486

2.481481

0.945274

2.95

15.88198

3.20

26.69753

11.93941

B-2

5

491

2.452138

0.946844

2.95

16.87666

3.20

27.44399

9.86041

B-3

5

487

2.457906

0.952381

2.95

16.68117

3.20

26.84805

11.70181

C-1

5.5

441

2.689342

0.956155

2.94

8.525769

3.21

19.89319

14.16691

C-2

5.5

443

2.674944

0.956962

2.94

9.015525

3.21

20.25485

14.31541

C-3

5.5

454

2.656388

0.940299

2.94

9.646678

3.21

22.187

12.47401

D-1

6

445

2.707865

0.9361

2.93

7.581394

3.24

21.76446

12.26611

D-2

6

469

2.579957

0.932231

2.93

11.94685

3.24

25.76799

11.49391

D-3

6

467

2.601713

0.928395

2.93

11.20433

3.24

25.45008

10.00891

E-1

7

442

2.692308

0.937815

2.89

6.840564

3.23

21.83013

11.07811

E-2

7

435

2.733333

0.938604

2.89

5.420992

3.23

20.57222

10.92961

E-3

7

432

2.740741

0.942568

2.89

5.16468

3.23

20.02064

9.56341

IV. RESULTS AND DISCUSSION

Three samples had been tested for each percentage of the bamboo and coir fibre. The average of the three values had been taken for the analysis. All the average values have been mentioned below in the table:

Conclusion

1) Stability value first increases with increase in binder content then at a certain point it decreases gradually. Firstly it in-creases because bond between binder and aggregates becomes stronger and it decreases because applied load is trans-mitted as hydrostatic pressure making fractions across constant point immobilized. This makes the mixture weak against plastic deformation and stability falls. From the graph the average stability value of coir fiber is highest fol-lowed by bamboo fiber and without fiber SMA mix. 2) Flow value increases with the increase in binder content because at lower binder content the mixes provides more sta-bility as its homogeneity is not much disturbed but it is lost when binder content is increased. From the graph coir fiber has the least flow value (2.80mm) followed by bamboo fiber and mix without fiber mix. 3) OBC is found to be 5.5%.It is found where maximum stability occurs. 4) VA decreases with the increase in binder content because air voids is filled progressively. At 7% binder content the VA value of coir fiber is much more than bamboo and without fiber mix due to improper mixing.

References

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Copyright © 2023 Ayush Goswami, Mahesh Ram Patel. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Paper Id : IJRASET49460

Publish Date : 2023-03-08

ISSN : 2321-9653

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