*Analisa Pengaruh Penggunaan Kawat Bendrat, Silica Fume, dan Superplasticizer terhadap Kuat Tekan dan Kuat Tarik pada Beton Mutu Tinggi

ANALYSIS OF THE EFFECT ADDITION OF STEEL FIBER (WIRE BENDRAT), SILICA FUME AND SUPERPLASTICIZER TO COMPRESSIVE STRENGTH AND TENSILE STRENGTH ON HIGH STRENGTH CONCRETE* Dita Aprilia Iskandar Binus University, Jl. KH. Syahdan No. 9 Kemanggisan Jakarta Barat, 5345830, [email protected] Dita Aprilia Iskandar, Irpan Hidayat ABSTRACT This study aims to determine the effect of the use of materials such as wire bendrat concrete mixer, silica fume, and superplasticizer in improving the compressive strength and tensile strength in high strength concrete. Samples in this research were 84 pieces of concrete cylindrical, with a wire percentage of 2% with variation in the length of 80 mm to 100 mm, and 120 mm, and the percentage of superplasticizer of 1.5%. While the percentage of silica fume by 10%, 20%, and 30% substitution of cement weight. Research methodology refers to SK SNI 03-6468-2000. Analysis carried out on the results of testing and comparing the compressive strength and tensile strength of concrete samples containing wire bendrat, silica fume, and superplasticizer. Based on the test results we concluded that the use of wire bendrat not affect the compressive strength of concrete, but berperngaruh to the tensile strength of the concrete. Seen from the results pengujuan tensile strength of normal concrete value for 4,27Mpa. While concrete using bendrat 80 mm wire has a tensile strength optimum results compared to 100 mm and 120 mm for 7,38Mpa. Key Word: Bendrat Wire, Silica Fume, Superplasticizer, High Strength Concrete

PREFACE Concrete is a major component in a structure that serves as an advocate for the load. As the development of technology and science, the study of the concrete continues to grow. Concrete can withstand compressive force that is high enough but not good enough to withstand the force of attraction. To overcome these shortcomings then on the construction experience tensile force must be reinforced with certain materials such as steel to produce good concrete.

*Analisa Pengaruh Penggunaan Kawat Bendrat, Silica Fume, dan Superplasticizer terhadap Kuat Tekan dan Kuat Tarik pada Beton Mutu Tinggi

In this study, researchers tried to apply the normal concrete into high strength concrete by giving agregattambahan namely wire bendrat and silica fume. Bendrat wire serves as an addition to the tensile strength of concrete sedangkanSilica fume serves as an addition to the concrete compressive strength. One problem that greatly affects the compressive strength of concrete is the presence of porosity. The greater the porosity, the compressive strength will be smaller, whereas the smaller porosity compressive strength will be even greater. The greater the FAS her the porosity will be greater, the smaller the FAS his otherwise it will be smaller porosity. To obtain high strength concrete it must be used FAS are low, but if FAS (Water Factor Cement) is too low, the concrete work will be more difficult, thus compacting was not optimal and will result in a loss, and it affect the compressive strength of concrete. To overcome this can be used superplasticizer sikaviscocrete 1003. The function of the added material is to add tingakat workability of the concrete mix without having to add value Cement Water Factor (FAS) in the concrete mix. The FAS value affects the level of porosity of concrete, the smaller the value of FAS, the level of porosity of concrete will tend to be smaller. This is the level that affect the porosity of the concrete compressive strength and permeability of concrete. Bendrat wire is a metallic material that is known as one of the ingredients that have advantages in tensile strength, but has the disadvantage of easily corrosive if there are some fibers which are not covered by concrete. In this study bendrat wire used is wire bendrat. Bendrat wire is commonly found in Indonesia because it is easily accessible and relatively cheap. In the construction of buildings normally used wire to tie bendrat stirrup reinforcement.

RESEARCH METHOD The research method is a sequence of steps to be implemented in connection with studies on the effect of the use of wire bendrat of compressive strength of high strength concrete. In the first stage will be the study of literature in order to learn the basics of the theory relating to research to be carried out and considering the kind of research that has been done as a reference in conducting research. Source of data to be used are: 1. Primary data: is the data obtained from the testing of concrete samples in the Laboratory of Civil Engineering Bina Nusantara 2. Secondary data: is the data obtained from reference literature relating to high quality concrete and the use of wire bendrat Furthermore, researchers conducted research on methods peracang pekasanaan in concrete mixtures that are tailored to the limitations discussed in the previous chapter. After that for the realization of good research conducted experiments in the laboratory so that later obtained the data needed to be processed and analyzed. And the last stage is made the conclusion of the research that has been done and presented in the final report. Here are the steps that will be listed in the flow chart below:


Gambar 1 Diagram Alir Penelitian

RESULTS AND DISCUSSIONS Concrete Compressive Strength Testing Results • Analysis Value Compressive Strength Concrete In the last stage of research is testing the strength of concrete at the age of 7 and 28 days . Results of testing compressive strength of concrete in this study are as follows :


Kode

Superplasticizer

Silica fume

Campuran Serat Baja

Umur (Hari) 7

N

0%

0%

0% 28 7

80

1,50%

10%

2%

28

7 100

120

1,50%

1,50%

10%

10%

2%

2%

28

7 28

Berat Sampel (kg) 12 12,1 11,9 12 12,3 12 12,2 12,5 12,2 12,4 12,2 12,7 12,4 12,7 11,8 12,3 12,4 12,3 13,5 13,4 13,4 14,5

Berat Ratarata (kg) 12

12,1 12,30

12,43

12,3

12,3

13,43 13,77

Kuat Tekan (Mpa) 16,16 15,52 16,17 50,75 49,13 51,39 14,55 13 16,162 43,64 40,40 48,09 14,61 16,19 13,74 43,64 40,57 48,13 12,12 12,93 15,35 41,70

Kuat Tekan Rata-rata (Mpa)

Berat Jenis (kg/m3)

15,95

2264,151

50,42

2283,019

14,55

2320,75

44,04

2345,91

14,85

2320,75

44,11

2327,04

13,47

2534,59

43,16

2597,48


13,4 13,4 Kode

Superplasticizer

Silica fume

Campuran Serat Baja

Umur (Hari) 7

S10

1,50%

10%

0%

7 1,50%

20%

0% 28

7 S30

1,50%

30%

Berat Ratarata (kg) 12,2

12,2 28

S20

Berat Sampel (kg) 12,2 12,2 12,2

44,15 43,64

0% 28

12,2 12,2 13,1 13,1 13,1 13,1 13,1 13,1 12,7 11,5 11,7 13 13 11,7

Kuat Tekan (Mpa) 12,93 13,25 13,58

Kuat Tekan Rata-rata (Mpa)

Berat Jenis (kg/m3)

13,25

2301,89

43,95

2301,89

17,24

2471,70

33,94

2471,70

14,22

2257,86

34,53

2371,07

45,58 12,2

13,1

13,1

11,97

12,57

41,70 44,57 16,16 19,39 16,16 35,56 32,32 33,94 14,55 15,19 12,93 35,56 34,10 33,94


Gambar 1 Grafik Analisa Kuat Tekan BetonMenggunakan Kawat Bendrat (Benda Uji Berbentuk Silinder)

Gambar 2. Grafik Analisa Kuat Tekan Beton Menggunakan Silica Fume Based on Figure 1 can be seen that concrete using wire bendrat with a length of 100 mm and a mixture of silica fume 10% substitution of cement produces concrete compressive strength higher than the concrete using a wire with a length of 80, and 120 mm but the difference in compressive strength was not very significant due to the use of silica fume and superplasticizer with uniform levels. And a compressive strength of 2 based on images produced by a mixture of silica fumesebesar additional 10% yield optimum compressive strength compared to the substitution of silica fumesebesar 20% and 30% in concrete. Due to more and more use of silica fume will lower the compressive strength of the concrete.


Concrete Tensil Strength Testing Results • Analysis Value Tensil Strength Concrete In the last stage of research is testing the strength of concrete at the age of 7 and 28 days . Results of testing compressive strength of concrete in this study are as follows :


Kode

Superplasticizer

Silica fume

Campuran Serat Baja

Umur (Hari)

Berat Sampel (kg)

Berat Rata-rata (kg)

12 7 N

0%

0%

0% 28

7 80

1,50%

10%

2% 28

7 100

1,50%

10%

2% 28

120

1,50%

10%

2%

7

12,1

Kuat Tarik (Mpa)

12

2,26 2,04

12

3,39 12,1

4,56

11,912

4,85

12,2

4,85

12,5

12,3

4

12,2

5,5

12,4

6,46

12,2

12,43

8,08

12,7

7,6

12,4

3,88

12,7

12,3

4,85

11,8

3,23

12,3

5,85

12,4

12,33

5,66

12,3

5,33

13,5

2,91

13,4

Berat Jenis (kg/m3)

2,33

2264,15

4,27

2277,48

4,62

2315,09

7,38

2345,91

3,99

2320,75

5,61

2327,04

2,17

2534,59

2,68

11,9

12,3

Kuat Tarik Rata-Rata (Mpa)

13,43

1,71


Berat Sampel (kg)

Kuat Tarik (Mpa)

13,4

1,88

14,5

7,11

13,4

5,82

13,4

6,46

12,2

3,23

12,2

5,49

12,2

3,88

12,2

7,76

12,2

5,17

12,2

6,14

13,1

3,17

13,1

2,59

13,1

2,88

13,1

5,79

13,1

6,46

13,1

6,23

12,7

4,33

11,5

3,23

11,7

2,59

13

6,79

13

6,46

11,7

5,07


Gambar 2 Grafik Kuat Analisa Kuat Tarik Beton Menggunakan Kawat Bendrat (Benda Uji Berbentuk Silinder)

Based on the strong figure 2 above the optimum tensile strength, it can be seen that the concrete with a mixture of 2% wire with a length of 80 mm has a higher tensile strength is 7.28 MPa at 28 days compared with normal concrete without wire bendrat mixture which has tensile strength of 4.27 at 28 days. This is because there are bendrat existing wire in the concrete mixture which can increase the value of tensile strength in concrete.

Gambar 3 Grafik Kuat Tarik Beton Menggunakan Silica Fume (Benda Uji Berbentuk Silinder)


Based on the strong figure 3 above optimum tensile strength, it is known that a mixture of silica fume concrete with 10% without campurankawat has a higher tensile strength is 6,36MPa at 28 days compared with normal concrete without wire bendrat mixture which has tensile strength of 4, 27 at 28 days.

CONCLUSIONS AND RECOMMENDATIONS Based on the research that has been done, it can be concluded that the results of this study are as follows: a. For the manufacture of normal concrete without any mixture of wire, SP, or silica fume average compressive strength at 28 days was 50.42 and tensile strength of normal concrete at 28 days amounted to 4.27 Mpa b. Results The optimum compressive strength of concrete at 28 days using bendrat wire with a wire length of 100 mm, the SP of 1.5%, and silica fume 10% result from the substitution of cement amounted to 44.11 MPa. And the results of the tensile strength of concrete optimum age of 28 days with 80 mm wire is a mixture of 7.38 MPa c. From the results obtained, the use of wire in the concrete bendrat not increase the compressive strength of the concrete, but only adds ductility in the tensile strength of concrete. However, the results of research conducted by Sudarmoko (1993), wire bendrat effect on the compressive strength of concrete. It can be due to the quality of aggregates used during the research process have high levels of sludge that is by 4.4%. When it should be the value of the levels of sludge contained in coarse aggregate swordfish should be no more than 1%. d. The use of silica fume in high-quality concrete admixtures can help the compressive strength at beton.Silica fume may reduce the permeability of concrete, silica fume and with nature is what can reduce the ingress of water or other chemicals into the concrete. e. Silica fume can also protect the wire from corrosion threat. So from that optimum tensile strength values in this study had a better outcome in the amount of 7.38 Mpa. f. The use of superplasticizer for concrete admixtures affect the value slump.Pada normal concrete without superplasticizer mix the average value of its slump by 50 mm. As for the concrete using superplasticizer average value of its slump to 80 mm. That is the use of superplasticizer in high quality concrete mixing effect on the level of ease of work (workability) in the concrete mix. With the use of superplasticizer 1.5% to the weight of the cement may increase kelecakan on the concrete, thereby reducing the porosity or voids in the concrete that can reduce the compressive strength of the concrete. g. Value density at 100 mm wire use has decreased. This can be caused by human error factor (human error) during the process rojokan on the concrete resulting concrete is not padat.Karna when rojokan solid concrete, and will add to the porosity present in the concrete.


Recomendation After conducting research and draw conclusions from the results of the study, the researchers suggest: a. The need for the use of materials such as coarse aggregate, fine aggregate and cement with good quality, in order to produce material test parameter values in accordance with ISO standards, b. Carried out further research on the use of wire bendrat to high quality concrete. Neither of the addition of variables and variations in wire size bendrat used, c. Future studies using the percentage of wire bendrat greater mix of high quality concrete and can obtain better results from previous studies, d. Future studies do variations on the percentage of superplasticizer Sika Viscocrete in high quality concrete mix.

REFERENCE ASTM C.125-1995:61. Standard Definition of Terminilogy Relating to Concrete and Concrete Aggregates ASTM C.1240-95. Sikaesification For Silica Fume For Use In Hydraulic Cement Concrete And Mortar Ariatama, Ananta (2007). Pengaruh Pemakaian Kawat bendrat Berkait Pada Kekuatan Beton Mutu Tinggi Berdasarkan Optimasi Diameter Serat. Djamaluddin Rudy, Maddjid, dan Sita Datu (2010) dalam penelitiannya yang berjudul “Studi Pengaruh Sumber Bahan Baku Agregat Terhadap Kuat Tekan Beton Mutu Tinggi” Kusumo, Laurensius Agil Damar. (2013). Pengaruh Penambahan Kawat bendrat Lokal (Kawat bendrat) Pada Beton Memadat Mandiri (Self Compacting Concrete). Kusnadi, Andi (2010). Studi Kekuatan Tekan Pada Beton Ringan Berserat Dengan Agregat Alwa. Krisman Aprieli Zaidengan (2007). Pengaruh Penambahan Silica fume dan Superplasticizer Terhadap Kuat Tekan Beton Mutu Tinggi Dengan Metode Aci (American Concrete Institute) Mariance Napitupulu, dan Besman Surbakti (2010). Analisa dan Kajian Eksikaerimental Pengaruh Penambahan Kawat bendrat (Kawat bendrat) pada Daerah Tarik Balok Beton Bertulang. Purnawan Gunawan, Slamet Prayitno, Hermansyah (2013). Pengaruh Penambahan Serat Bendrat Pada Beton Ringan Dengan Teknologi Foam Terhadap Kuat Lentur, Toughness, Dan Stiffness. Purnawan Gunawan, Slamet Prayitno, Surya Adi Putra (2013). Pengaruh Penambahan Serat Bendrat Pada Beton Ringan Dengan Teknologi Foam Terhadap Kuat Tekan, Kuat Tarik, Dan Modulus Elastisitas. Sahay, Nugraha Sagit dan Ngini, Giris (2010). Pengaruh Penambahan Kawat bendrat Pada Campuran Beton Terhadap Kuat Tekan Beton. SK.SNI T-15-1991-03. Tata Cara Perhitungan Sturktur Beton untuk Bangunan Gedung. SK.SNI 03-6468-2000. Tata Cara Perencanaan Campuran Beton Mutu Tinggi Dengan Semen Portland Dengan Abu Terbang

BIOGRAPHY Dita Aprilia Iskandar lahir di Tangerang pada tanggal 3 April 1993, Author graduated in Bina Nusantara University in Civil Engineering Major in 2015


*Analisa Pengaruh Penggunaan Kawat Bendrat, Silica Fume, dan Superplasticizer terhadap Kuat Tekan dan Kuat Tarik pada Beton Mutu Tinggi

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