p–ISSN: 2723 - 6609 e-ISSN: 2745-5254

Vol. 5, No. 9 September 2024 http://jist.publikasiindonesia.id/

Jurnal Indonesia Sosial Teknologi, Vol. 5, No. 9, September 2024 3756

Effect of Compressive Strength and Tensile Strength Value on

Fiber Concrete Using Bendrat Wire Fibers

Yosia Clinton Purba

1

*, Johannes Tarigan

2

, Nursyamsi

3

, Ricky Bakara

4

Universitas Sumatera Utara, Indonesia

Email:

[email protected]

1*

, [email protected]

2

, [email protected]

3

,

[email protected]

4

*Correspondence

ABSTRACT

Keywords: fiber concrete;

bent wire fiber;

compressive strength;

tensile strength.

Concrete is a material used in modern construction and is a

very important component in the manufacture of structures.

Concrete has advantages, but also disadvantages, namely

low tensile strength. To increase the tensile strength of

concrete, fibers are added to the mix. One of the efforts made

to increase the tensile strength of concrete is the addition of

fibers to the fiber-concrete mixture. The purpose of this

study is to examine the compressive strength and tensile

strength values in fiber concrete if added with variations in

fiber addition. An innovation in increasing the value of

mechanical quantities in concrete is the use of bent wire

fibers as a mixture in fiber concrete. This material is taken

from former pieces in construction projects to connect steel

reinforcement with Sengkang reinforcement and is also

widely found in building shops. The fibers were also

analyzed for microstructure using SEM (Scanning Electron

Microstructure) tools. The length of this bent wire fiber is 13

mm with a diameter of 0.82 mm and has a minimum tensile

strength value of 334.5 MPa. The variations in the addition

of these bent wire fibers are 0%, 3%, 6%, and 9% of the total

weight of the steel fiber. The soaking life of concrete is 7

days, 14 days, and 28 days. The results of this study show

that the more variations in the addition of bent wire fibers,

the compressive strength value of concrete and the tensile

strength value of concrete will also increase. It can be seen

that fiber concrete with an immersion life of 28 days with a

variation of 9% added bent wire fiber has a maximum

compressive strength value of concrete which is 63,645 MPa

and a maximum value of tensile strength of 3,294 MP.

Introduction

Concrete is a material that is often found in construction projects and is one of the

materials that is often used in construction in Indonesia, both in the construction of

buildings, roads, irrigation, and others (Indrayani et al., 2022). The things that make

concrete materials more often used in construction in Indonesia are concrete constituent

Effect of Compressive Strength and Tensile Strength Value on Fiber Concrete Using Bendrat

Wire Fibers

Jurnal Indonesia Sosial Teknologi, Vol. 5, No. 9, September 2024 3757

materials that can be easily found in various regions with a relatively low-cost budget

compared to other civil construction materials. According to (Kawulusan et al., 2019),

the properties of concrete are that it has a high compressive strength value but a low

tensile strength value (Arman et al., 2023). The use of concrete as the main material in

construction has several advantages, including relatively high compressive strength

value, concrete can be easily shaped, economical cost, durable, and tends to have better

resistance in various conditions such as the environment (Sahid & MM, 2017).

In addition to the advantages of the material, concrete also has several

disadvantages that can cause a reduced service life. The brittle nature of concrete

materials causes cracks and damage to occur very easily if tensile force is applied. If a

tensile load exceeds its capacity, then cracking will occur. (Putra, 2021). However, if the

concrete is continuously allowed to crack, it can reduce durability and can even cause

corrosion of the rebar steel in it if water and air have reacted. The shortcomings found in

concrete are certainly the most important focus for researchers to increase the tensile

capacity of concrete. So the researcher made a study by utilizing waste materials to be

used as fiber as a mixture in concrete, which is called fiber concrete. (Ramadhani, 2021).

Fiber concrete is made by adding fibers to increase its tensile strength, making it

more resistant to the tensile forces caused by weather, climate, and temperature that

usually occur in concrete with a large surface. Fiber concrete can be made from natural

or artificial fibers. Natural fibers usually come from plants, such as palm oil, coconut

fiber, and sisal, among others. Artificial fibers are usually made of compounds, which are

highly weather-resistant polymers. Polypropylene, polyethylene, and other fibers are the

most commonly used artificial fibers. (Tjokrodimuljo, 2007).

In the bent wire fiber, it has a relatively high modulus and strength. This fiber also

cannot be deformed due to the influence of alkaline cement and can be mechanically

installed as an increase in adhesion data to concrete materials. The effect of the addition

of local fibers on the concrete material mixture can be seen from the compressive strength,

ductility, and impact resistance of the resulting concrete fibers. Some factors that are of

special concern in fiber concrete are mixing techniques so that the distribution of the

fibers becomes even in random directions. However, this can be overcome by adding

proportions to the concrete mixture such as adding a superplasticizer. In these fibers, it is

also said that there is a decrease in workability due to the addition of variations in fiber

addition and an increase in the fiber fineness ratio. (Haq & Andayani, 2017).

Although there have been many studies that use fiber as a concrete mixture material

as reinforcement in improving the mechanical performance of fiber concrete, this

scientific writing is more focused on concrete with a mixture of bent wire fibers. The

development of this study is somewhat different from previous studies, but this study

aims to investigate the analysis of microstructure in bentrat wire fibers, test the slump

flow value, check the volume weight of fiber concrete, test the compressive strength of

fiber concrete, and test the tensile strength of fiber concrete.

Yosia Clinton Purba, Johannes Tarigan, Nursyamsi, Ricky Bakara

Jurnal Indonesia Sosial Teknologi, Vol. 5, No. 9, September 2024 3758

Method

Experimentally, this research includes preparatory work such as materials to be

used and examination of materials.

1. Material

The materials used in this study include the following:

a. Fine Aggregate (Sand)

This fine aggregate or sand, is taken from a building shop in the city of Medan,

North Sumatra where the source of the material is taken from the city of Binjai, North

Sumatra. Before the sand was mixed on fiber concrete, mechanical properties testing was

carried out at the Laboratory of Concrete Materials and Engineering, University of North

Sumatra with the following data results below.

Table 1

Hasil Pengujian Mechanical Properties Agregat Halus

b. Semen PCC (Portland Composite Cement) Type 1

In this PCC Type 1 cement, the material used is Dynamix cement which is a product

of PT. Semen Indonesia (Persero) Tbk. with a packaging of 1 zak of 40 kg.

c. Silica Fume

Silica fume is a very fine granular material with a diameter of 1/100 of the diameter

of cement and this material has a SiO2 content of more than 85% (Kusumo, 2013). The

silica fume material used is SikaFume which is a product of PT. SIKA Indonesia, Tbk.

with 1 zak 20 kg packaging.

d. Superplasticizer

This superplasticizer is an additional material that aims to make concrete easily melt

and can be self-compacting concrete. The superplasticizer material used is Sika

ViscoCrete 3115 N which is produced from PT. SIKA Indonesia, Tbk. with 20 liters / 20

kg packaging.

Types of Testing

Technical

Specifications

Test

Results

Standard

Conclusion

Sieve Analysis

(Sieve Analyze)

2,2 – 3,2

FM = 1,97

ASTM C136 –

84a

Not OK!

Specific Gravity

(Specific Gravity)

Bulk < SSD <

Apparent

SSD = 2,48

ASTM C128 –

88

OK!

Absorption

(Absorption)

< 5%

2,88 %

ASTM C128 –

88

OK!

Contents Weight

(Unit Weight)

> 1.125 kg/m3

1.324,38

kg/m3

ASTM

C29/C29

M – 90

OK!

Sludge Content

(Washing By No.

200)

< 5%

2,3 %

ASTM C117 -

90

OK!

Up Air

(Water Content)

-

9,20 %

ASTM D1864-

89

OK!

Effect of Compressive Strength and Tensile Strength Value on Fiber Concrete Using Bendrat

Wire Fibers

Jurnal Indonesia Sosial Teknologi, Vol. 5, No. 9, September 2024 3759

e. Bendrat Wire Fiber

This bent wire fiber is taken from former pieces from a construction project with a

length of 13 mm and a fiber diameter of 0.82 mm. The tensile strength test on this wire

was carried out at the North Sumatra Provincial Industry Office, with the result of the

tensile strength value of the wire being 334.5 MPa.

Stages of Research

After the materials have been attached, the next stages of research are made as

follows:

a. Preparing Materials

The materials that will be used in this fiber concrete mixture are PCC (Portland

Composite Cement) Type 1 cement, fine aggregate, superplasticizer, bitrate wire fiber,

and water.

b. Providing Equipment

After preparing the material to be used, the equipment also needs to be prepared,

including molds of concrete cylinder test pieces, scales, mixer boxes, buckets, cement

spoons, abrams cones, meters, and digital compression machine tests.

c. Mix Design Mix Planning

In the planning of the mixed design of fiber concrete, it was adopted by referring to

research made by (Tayeh et al., 2013). However, specifically, this study refers to the

materials that have been presented above, namely PCC (Portland Composite Cement),

river sand, silica fume, water, superplasticizer, and adjustment with variations in the

addition of bent wire fibers as listed in Table 2. below.

Table 2

Composition of Fiber Concrete Mixture

d. Slump Flow Testing

The slump flow test is carried out to determine the viscosity result in concrete and

then test the velocity when the concrete flow reaches a diameter of 50 cm (T50) on the

fiber concrete mixture. The equipment used for slump flow testing is Abram cones and

also plywood materials that have been marked with circle boundaries with diameters of

20 cm, 50 cm, 65 cm, and 85 cm. The steps of this slump flow test are that the abrams

cone is placed on a plywood board that has been marked in the middle of the circle

Material Type

Volume of Fiber Concrete

0%

3%

6%

9%

(kg/m3)

Air

144

Semen PCC Type 1

768

Silica Fume

192

Superplasticizer

40

River Sand

1.140

Bendrat Wire Fiber

0,00

4,71

9,42

14,13

Cement Water Factor

(f.a.s.)

0,1875

Rasio w/b

0,15

Yosia Clinton Purba, Johannes Tarigan, Nursyamsi, Ricky Bakara

Jurnal Indonesia Sosial Teknologi, Vol. 5, No. 9, September 2024 3760

boundary which will later be filled with fresh concrete of bent wire fiber without

compaction or vibration, try when fresh concrete fills into the abrams cone so that the

material does not spill out from inside the cone. The time recording must also be done

after the abrams cone is lifted vertically, and the time of the test result T50 (seconds) is

recorded when the concrete flow reaches the 50 cm line. After recording the results of the

T50 test, look at the concrete flow again until the flow process is completed, and also

record the diameter of the slump flow.

e. Fiber Concrete Cylinder Test Specimen Sample

The number of samples of the fiber concrete cylinder test piece used is

differentiated according to the type of test. In the concrete compressive strength test, the

size of the concrete cylinder used is 12.5 cm in diameter and 19.6 cm in height.

Meanwhile, in the tensile strength test of concrete, the size of the concrete cylinder used

is 15 cm in diameter and 30 cm in height. Samples of fiber concrete cylinder test

specimens are loaded in Table 3. below.

Table 3

Fiber Concrete Cylinder Test Specimen Sample

f. Fiber Concrete Volume Weight Inspection

After the test piece is made, before conducting the test, the weight of the concrete

volume is checked, namely the weight of the concrete that has been weighed per the

volume of the concrete cylinder test piece. According to (Tjokrodimuljo, 2007), the

classification of concrete types is differentiated based on the weight of the volume of

concrete as stated in Table 4. below.

No.

Sample or

Specimen

Code

Cylinder Based Test Specimen

Compressive Strength of Concrete

Tensile

Strength

Concrete

Slats

7 Days

Old

Age

14 Days

Age

28 Days

Age

28 days

1

SF-0%

3

2

SF-3%

3

SF-6%

3

4

SF-9%

3

Effect of Compressive Strength and Tensile Strength Value on Fiber Concrete Using Bendrat

Wire Fibers

Jurnal Indonesia Sosial Teknologi, Vol. 5, No. 9, September 2024 3761

Table 4

Classification of Types of Concrete Based on Weight of Concrete Volume

g. Concrete Compressive Strength Testing

The compressive strength of concrete is the amount of load pressed per unit area on

the concrete base which causes the cylinder of the concrete test piece to collapse when

loaded with a certain compressive force by the influence of the press machine. The

compressive strength equation of concrete can be seen in equation (1) below.

f’

c

=











(1)

Information: f’

c

= Compressive strength of concrete (kN/m

2

)

P = Compressive force on concrete (kN)

D = Diameter of concrete cylinder (m)

h. Concrete Screed Tensile Strength Testing

The tensile strength of concrete is the result of the indirect tensile strength value of

the cylinder of the concrete test piece which is placed parallel to the table surface when

the testing machine is pressed (SNI 2491:2014). The tensile strength equation of concrete

can be seen in equation (2) below.

f

ct

=









(2)

Description: fct = Tensile stress of concrete slats (kN/m2)

P = Maximum applied tensile load (kN)

Ls = Height of concrete cylinder (m)

D = Diameter silinder beton (m)

Types of Concrete

Volume

Weight

(kg/m3)

Concrete

Function

Ultra-light concrete

< 1,000

Non-structure

Lightweight Concrete

1.000 – 2.000

Lightweight

structure

Concrete Normal

(Ordinary Concrete)

2.300 – 2.500

Structure

Heavy Concrete

> 3,000

X-ray shielding

Yosia Clinton Purba, Johannes Tarigan, Nursyamsi, Ricky Bakara

Jurnal Indonesia Sosial Teknologi, Vol. 5, No. 9, September 2024 3762

Results and Discussion

Slump Flow Test Results and T50 Test

This test begins with the creation of a mix design on fiber concrete that is adjusted

to the variation in the addition of bent wire fibers. Below is the slump flow testing data

of fiber concrete in Table 5. and Figure 3. and is in line with EFNARC regulatory

standards and JSCE regulations.

Table 5

Slump Flow Test Results on Fiber Concrete

Figure 3.

Relationship of Slump Flow to Variation in Addition of Bendrat Wire Fibers

Table 6

T50 Test Results on Fiber Concrete

No.

Variation in

Percentage of

Bentate Wire

Fiber

Diameter

Slump Flow

(cm)

Requirement

EFNARC

(55 – 85 cm)

Requirement

JSCE

(50 – 65 cm)

1

0%

101,1

Not OK!

2

3%

97,8

Not OK!

3

6%

93,7

Not OK!

4

9%

88,4

Not OK!

No.

Variation in

Percentage of

Bentate Wire Fiber

T50

(sec)

Requirement

EFNARC

(< 6 seconds)

Requirement

JSCE

(3-15

seconds)

101,1

97,8

93,7

88,4

0

10

20

30

40

50

60

70

80

90

100

110

0 3 6 9

Slump Flow

Beton Serat (cm)

Persentase Serat Kawat Bendrat (%)

Information:

Requirement Limit EFNARC

Requirement Limit JSCE

Effect of Compressive Strength and Tensile Strength Value on Fiber Concrete Using Bendrat

Wire Fibers

Jurnal Indonesia Sosial Teknologi, Vol. 5, No. 9, September 2024 3763

Figure 4

Relationship of T50 Test to Variation in Addition of Bendrate Wire Fibers

In the slump flow test of concrete fibers above, it can be concluded that the

influence of increasing bent wire fibers can reduce the diameter flow process in concrete,

this is because there is a decrease in workability along with the increase in the mixture of

variations in the percentage of added bent wire fibers. Then in the T50 test of fiber

concrete above, it can be concluded that the influence of increasing bent wire fibers will

slow down the diameter flow process time in concrete, this is because the fiber has

resisted the components of the fiber concrete mixture mixture so that the flow process

becomes slow. (Haq & Andayani, 2017).

Results of Weight Inspection of Fiber Concrete Volume

After conducting slump flow testing and T50 testing, then the next step is to check

the volume weight of fiber concrete, both for the test specimen cylinder for concrete

compressive strength testing and concrete tensile strength testing. (Arman et al., 2023).

It is known that the size of the cylinder is differentiated based on the testing of its

mechanical magnitude. Therefore, the weight check data of the volume of fiber concrete

before testing the compressive strength of concrete in Table 7 below is made.

1

0%

04,34

OK!

2

3%

05,06

OK!

3

6%

05,51

OK!

4

9%

06,12

Not OK!

OK!

4,34

5,06

5,51

6,12

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

0 3 6 9

T50 (cm)

Persentase Serat Kawat Bendrat (%)

Information:

EFNARC Requirement

Limits

JSCE Requirement Limits

Yosia Clinton Purba, Johannes Tarigan, Nursyamsi, Ricky Bakara

Jurnal Indonesia Sosial Teknologi, Vol. 5, No. 9, September 2024 3764

Table 7

Volume Weight Inspection on Fiber Concrete

Before Concrete Compressive Strength Testing

Specimen

Code

Weight of

Concrete Test

Specimen

(kg)

Volume of

Concrete

(m3)

Concrete

Volume

Weight

(kg/m3)

Concrete

Volume

Weight

Average

(kg/m3)

Concrete for Compressive Strength Testing of Concrete 7 Days Life

SF – 0%

5,880

0,0024308

2.343,366

2.377,905

5,940

2.367,277

6,080

2.423,072

SF – 3%

5,620

0,0024308

2.239,747

2.340,709

5,920

2.359,307

6,080

2.423,072

SF – 6%

6,280

0,0024308

2.502,778

2.476,209

6,300

2.510,749

6,060

2.415,101

SF – 9%

6,400

0,0024308

2.550.602

2.537,318

6,380

2.542.631

6,320

2.518,719

Concrete for 14-Day Life Concrete Compressive Strength Testing

SF – 0%

5,799

0,0024308

2.385,631

2.414,017

5,952

2.448,573

5,853

2.407,846

SF – 3%

5,895

0,0024308

2.425,124

2.384,122

6,036

2.483,129

5,455

2.244,114

SF – 6%

6,160

0,0024308

2.534,141

2.566,230

6,454

2.655,089

6,100

2.509,458

SF – 9%

6,291

0,0024308

2.588,033

2.537,318

6,224

2.560,470

6,344

2.609,837

Concrete for Compressive Strength Testing of Concrete 28 Days Life

SF – 0%

6,000

0,0024308

2.468,320

2.449,122

5,940

2.443,636

5,920

2.435,409

SF – 3%

5,940

0,0024308

2.443,636

2.435,409

5,640

2.320,220

Effect of Compressive Strength and Tensile Strength Value on Fiber Concrete Using Bendrat

Wire Fibers

Jurnal Indonesia Sosial Teknologi, Vol. 5, No. 9, September 2024 3765

Results of the weight inspection of fiber concrete volume before concrete

compressive strength testing are in Table 7. The above states that the average weight of

concrete volume with variations in the addition of 0% and 3% bent wire fiber for the age

of 7 days, 14 days, and 28 days is categorized as normal concrete because the

requirements for the type of concrete are at an integral of 2,300 – 2,500 kg/m3.

Meanwhile, the average volume weight of concrete with variations in the addition of 6%

and 9% of bent wire fibers for the age of 7 days, 14 days, and 28 days is categorized as

heavy concrete, because the average volume weight value reaches more than 2,500

kg/m3.

After that, the weight of the volume of fiber concrete is checked before testing the

tensile strength of the concrete as stated in Table 8. below.

Table 8

Volume Weight Inspection on 28-Day-Old Fiber Concrete

Before the Concrete Shear Tensile Strength Test

The results of the weight check of the volume of fiber concrete before the tensile

strength test of 28-day-old concrete are in Table 8. The above states that the average

weight of concrete volume with variations in the addition of 0%, 3%, 6%, and 9% bent

wire fibers are categorized as normal concrete because the requirements for the type of

concrete are integral 2,300 – 2,500 kg/m3.

6,180

2.542,369

SF – 6%

6,420

0,0024308

2.641,102

2.558,825

6,060

2.493,003

6,180

2.542,369

SF – 9%

6,640

0,0024308

2.731,607

2.770,003

6,820

2.805,657

6,740

2.772,746

Specimen

Code

Weight of

Concrete

Test

Specimen

(kg)

Volume of

Concrete

(m3)

Concrete

Volume

Weight

(kg/m3)

Concrete

Volume Weight

Average

(kg/m3)

SF – 0%

12,220

0,0053036

2.304,108

2.315,421

12,280

2.315,421

12,340

2.326,734

SF – 3%

12,400

0,0053036

2.338,047

2.333,019

12,380

2.334,276

12,340

2.326,734

SF – 6%

12,820

0,0053036

2.417,239

2.414,725

12,900

2.432,323

12,700

2.394,613

SF – 9%

12,660

0,0053036

2.387,071

2.384,557

12,640

2.383,300

12,640

2.383,300

Yosia Clinton Purba, Johannes Tarigan, Nursyamsi, Ricky Bakara

Jurnal Indonesia Sosial Teknologi, Vol. 5, No. 9, September 2024 3766

Results of Fiber Concrete Compressive Strength Test

After checking the weight of the volume of fiber concrete, the next step is to make

fiber concrete with a mixed design mixture as attached to Table 2. above. The concrete

cylinder test specimen used in the concrete compressive strength test was made with a

diameter of 12.5 cm and a height of 19.8 cm, and then the concrete was soaked for 7 days,

14 days, and 28 days. The results of the compressive strength test of fiber concrete can

be seen in Table 9. below below.

Table 9

Results of Fiber Concrete Compressive Strength Test

Specimen

Code

Maximum

Load

(kN)

Average

Maximum

Load

(kN)

Compressive

Strength of

Concrete

(MPa)

Compressive

Strength of

Concrete

Average

(MPa)

For Concrete with a Soaking Life of 7 Days

SF – 0%

263

428,333

20,760

33,811

473

37,337

549

43,336

SF – 3%

318

481,333

25,102

37,995

703

55,492

423

33,390

SF – 6%

728

612.667

57,466

48,362

492

38,837

618

48,783

SF – 9%

688

622

54,308

49,098

456

35,995

722

56,992

For Concrete with 14 Days Soaking Life

SF – 0%

401

473

31,653

37,337

498

39,310

520

41,047

SF – 3%

645

616,667

50,914

48,677

593

46,809

612

48,309

SF – 6%

802

658,333

63,307

51,966

696

54,940

477

37,653

SF – 9%

687

673,667

54,229

53,177

686

54,150

648

51,151

Effect of Compressive Strength and Tensile Strength Value on Fiber Concrete Using Bendrat

Wire Fibers

Jurnal Indonesia Sosial Teknologi, Vol. 5, No. 9, September 2024 3767

After Table 9. The data of the compressive strength test results of fiber concrete has

been loaded, so a clear graph of concrete compressive strength testing is made in Figure

5. below.

Figure 5. Graph of Fiber Concrete Compressive Strength Test

Based on Table 9. and Figure 5. above, that the increase in bitrate wire fibers above

both at the time of soaking concrete and the percentage of addition of bent wire fibers. It

can be seen that for a concrete soaking life of 28 days with the addition of 9% bent wire

fibers can reach 63,465 MPa.

For Concrete with a Soaking Life of 28 Days

SF – 0%

814

624

64,254

49,256

625

49,335

433

34,179

SF – 3%

694

667,010

54,782

52,650

711

56,124

596

47,046

SF – 6%

810

769,022

63,938

60,702

679

53,598

818

64,570

SF – 9%

863

803,990

68,122

63,465

768

60,623

781

61,649

33,811

37,995

48,362

49,098

37,337

48,677

51,966

53,177

49,256

52,65

60,702

63,465

0

5

10

15

20

25

30

35

40

45

50

55

60

65

0 3 6 9

Kuat Tekan Beton Serat (MPa)

Persen Penambahan Serat Kawat Bendrat (%)

Umur 7 Hari

Umur 14 Hari

Umur 28 Hari

Yosia Clinton Purba, Johannes Tarigan, Nursyamsi, Ricky Bakara

Jurnal Indonesia Sosial Teknologi, Vol. 5, No. 9, September 2024 3768

Concrete Tensile Strength Test Results

After the concrete compressive strength test, the tensile strength test of concrete is

made with the data presented in Table 10. below.

Table 10

Hasil Pengujian Kuat Tarik Belah Beton Serat

After Table 10. The data of the tensile strength test results of fiber concrete have

been loaded, so the graph of the tensile strength test of concrete is made in Figure 7.

below.

Specimen

Code

Maximum

Load

(kN)

Average

Maximu

m Load

(kN)

Strong

Tensile

Strength of

Concrete

(MPa)

Strong Tensile

Strength of

Concrete

Average

(MPa)

SF – 0%

160

176,667

2,258

2,494

180

2,542

190

2,683

SF – 3%

160

183,333

2,256

2,588

240

3,389

150

2,117

SF – 6%

230

210

3,245

2,964

240

3,386

160

2,259

Specimen

Code

Weight of

Concrete Test

Specimen

(kg)

Volume of

Concrete

(m3)

Concrete

Volume

Weight

(kg/m3)

Concrete

Volume

Weight

Average

(kg/m3)

SF – 9%

220

233,333

3,105

3,294

230

3,247

250

3,529

2,494

2,588

2,964

3,294

0

0,5

1

1,5

2

2,5

3

3,5

4

0 3 6 9

Kuat Tarik Belah Beton Serat

Umur 28 Hari (MPa)

Persen Penambahan Serat Kawat Bendrat (%)

Effect of Compressive Strength and Tensile Strength Value on Fiber Concrete Using Bendrat

Wire Fibers

Jurnal Indonesia Sosial Teknologi, Vol. 5, No. 9, September 2024 3769

Figure 6. 28 Days Lifespan Fiber Concrete Shear Strength Test Chart

Based on Table 10. and Figure 6. above, that the increase in bent wire fibers above

both at the time of soaking the concrete and the percentage of added bent wire fibers, as

happened in the compressive strength test of concrete. It can be seen that for a concrete

soaking life of 28 days with the addition of 9% bent wire fibers can reach 3,294 MPa.

Conclusion

Based on the results of the research that has been carried out, a conclusion can be

drawn that bent wire fiber material can cause a decrease in workability in concrete. Of

course, the decrease is not significant, because of the addition of superplasticizer so that

in the slump flow test, the difference in concrete flow is not too large compared to

concrete without the use of bent wire fiber. It can be seen in the compressive strength test

of fiber concrete, that both the variation in the soaking time of concrete and the variation

in the addition of the percentage of bent wire fibers are seen to have increased

significantly.

Yosia Clinton Purba, Johannes Tarigan, Nursyamsi, Ricky Bakara

Jurnal Indonesia Sosial Teknologi, Vol. 5, No. 9, September 2024 3770

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