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Laksmi Irianti
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Pengaruh Penggunaan Fly Ash Sebgai Bahan Pengganti Sejumlah Semen dan Bahan Tambahan Terhadap Kuat Tekan pada Self Compacting Concrete (SCC) Corry Jayaputri Sahast; Vera Agustriana Noorhidana; Laksmi Irianti; Surya Sebayang
Jurnal Rekayasa Sipil dan Desain Vol 10, No 2 (2022): Edisi Juni 2022
Publisher : Jurnal Rekayasa Sipil dan Desain

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Self Compacting Concrete (SCC) is an innovation of concrete which has an ability to flow on its own to fill the empty voids between reinforcement and formwork without support of compaction equipment to obtain its optimum compaction. In this research, concrete cylinder with dimension of 15 cm for diameter and 30 cm for height were used as a specimen and mixed with fly ash type C as cement partial substitute material and additional substance by variation of 0%, 3%, 6%, 9%, and 12% with water cement ratio of 0.41. Slump flow test was perform to identify concrete flowability and workability followed by concrete compression test to identify compressive strength which was conducted at the age of 35 days and 56 days. Due to the fact that percentage variation of fly ash increment, the value of slump flow test was experiencing degradation whereas the compressive strength was increased. Nonetheless, the optimum fly ash application appeared when fly ash was applied as a cement partial substitute at variation of 3%, which provide concrete compressive strength in the amount of 35.98 MPa (35 days) and 33.68 MPa (56 days), and the value of concrete density were 2313.21 kg/m3 and 2279.66 kg/m3 , where the standard of slump flow test and T50 values had accomplished.
Studi Eksperimental Pengaruh Variasi Ukuran Recycled Coarse Aggregate (RCA) Terhadap Kuat Tekan dan Kuat Tarik Belah Beton Mutu Normal. Nur Mila Putri; Laksmi Irianti; Surya Sebayang; Vera Agustriana Noorhidana
Jurnal Rekayasa Sipil dan Desain Vol 10, No 2 (2022): Edisi Juni 2022
Publisher : Jurnal Rekayasa Sipil dan Desain

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AbstractScattered concrete waste can cause adverse effects for the surrounding environment. It  must be recycled to reduce the waste, one of which is as a substitute for coarse aggregates of broken stones. To find out the feasibility of RCA concrete must be done material testing as well as testing of compressive strength and tensile strength using a cylinder test object measuring 15 x 30 cm. In this study, the materials used were RCA with a maximum aggregate size of 1 cm, 2 cm, and 4 cm which were randomly taken around the Materials and Construction Laboratory. So it is expected that unused concrete can be reused to reduce existing concrete waste. The results of 28-day split compressive strength for aggregate size of 1 cm on 28,99 MPa, 2 cm on 28,52 MPa, and 4 cm on 26,29 MPa. 28-day RCA size of 1 cm on 28,21 MPa, 2 cm on 27,72 MPa, and 4 cm on 25,09 MPa. The results of 28-day split tesnsile strength for 1 cm on 3,18 MPa, 2 cm on 2,81 MPa, and 4 cm on 2,58 MPa. 28-day RCA for aggregate size of 1 cm on 2,99 MPa, 2 cm on 2,48 MPa, and 4 cm on 2,31 Mpa. From these results, it is also known that the decrease in concrete testing results using RCA against splits is 2,69–4,56% for compressive strength and 5,97–10,47% for tesnsile strength.Keyword: RCA, size, compressive strength, splitting tesnsile test. AbstrakLimbah beton yang berserakan dapat menyebabkan dampak buruk bagi lingkungan sekitar. Untuk mengurangi limbah tersebut harus dilakukan daur ulang, salah satunya yaitu sebagai pengganti agregat kasar pada beton. Untuk mengetahui kelayakan RCA tersebut harus dilakukan pengujian material serta pengujian kuat tekan dan kuat tarik belah pada beton dengan menggunakan benda uji silinder berukuran 15 x 30 cm. Pada penelitian ini, material yang digunakan yaitu RCA dengan ukuran maksimum agregat 1 cm, 2 cm, dan 4 cm yang diambil secara acak di sekitar Laboratorium Bahan dan Konstruksi. Diharapkan beton yang sudah tidak terpakai dapat digunakan kembali agar mengurangi limbah beton yang ada.Hasil pengujian kuat tekan beton 28 hari yang menggunakan split ukuran 1 cm sebesar 28,99 MPa, 2 cm sebesar 28,52 MPa, dan 4 cm sebesar 26,29 MPa. Pada beton RCA umur 28 hari untukukuran 1 cm sebesar 28,21 MPa, 2 cm sebesar 27,72 MPa, dan 4 cm sebesar 25,09 MPa. Hasil pengujian kuat tarik belah 28 hari pada beton yang menggunakan split ukuran 1 cm sebesar 3,18 MPa, 2 cm sebesar 2,81 MPa, dan 4 cm sebesar 2,58 MPa. Pada beton RCA umur 28 hari ukuran 1 cm sebesar 2,99 MPa, 2 cm sebesar 2,48 MPa, dan 4 cm sebesar 2,31 MPa. Dari hasil tersebut juga diketahui penurunan hasil pengujian beton RCA terhadap beton split yaitu sebesar 2,69 – 4,56% untuk kuat tekan dan 5,97 – 10,47% untuk kuat tarik belah. Kata kunci: RCA, ukuran, kuat tekan, kuat tarik belah.
Analisis Perbandingan Pengaruh Penambahan Serat Baja Karbon 3D Dramix dan Serat Kawat Bendrat Terhadap Kuat Tekan, Kuat Tarik Belah, dan Kuat Tarik Lentur Pada Beton Mutu Normal Netta Riana; Vera Agustriana Noorhidana; Laksmi Irianti; Fikri Alami
Jurnal Rekayasa Sipil dan Desain Vol 10, No 2 (2022): Edisi Juni 2022
Publisher : Jurnal Rekayasa Sipil dan Desain

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AbstractIn general, the structural characteristics of concrete are that it has a high compressive strength but is weak in tensile strength. The aim of this study was to coMPare the effects of adding Dramix 3D carbon steel fiber and bendrat wire fiber on the compressive strength, split tensile strength, and flexural tensile strength in normal quality concrete. In this study, the addition of Dramix 3D carbon steel fiber and bendrat wire fiber with volume fractions of 0%, 1%, 1.5%, and 2% of the volume of the concrete mix was evaluated. The samples for this study were a cylinder with a diameter of 15 cm and a height of 30 cm for the compressive strength and split tensile strength tests, and a beam measuring 10 x 10 x 40 cm for the flexural tensile strength test. From the results of the study, it was found: (1) The compressive strength maximum occur of the addition of bendrat wire fiber at Vf 1% increased by 19.33% from the compressive strength of concrete at Vf 0%., (2) The split tensile strength maximum occur of the addition of 3D Dramix carbon steel fibers at Vf 2% increased by 88.38% from the split tensile strength of Vf 0% concrete., and (3) The flexural tensile strength maximum occur of the addition of Dramix 3D carbon steel fibers at Vf 2% increased by 465.63% from the flexural tensile strength of concrete at Vf 0%. Key words : Dramix 3D carbon stell fiber, bendrat wire fiber, compressive strength, split tensile strength, flexural tensile strength. AbstrakBeton mempunyai kuat tekan yang besar tetapi lemah terhadap kuat tarik. Tujuan dari penelitian ini adalah untuk mengetahui perbandingan pengaruh penambahan serat baja karbon 3D Dramix dan serat kawat bendrat terhadap kuat tekan, kuat tarik belah, dan kuat tarik lentur pada beton mutu normal. Pada penelitian ini, dilakukan penambahan serat baja karbon 3D Dramix dan serat kawat bendrat dengan volume fraksi sebesar 0%, 1%, 1,5% dan  2% dari volume adukan beton. Sampel pada penelitian ini berupa silinder dengan (diameter 15 cm dan tinggi 30 cm) untuk uji kuat tekan dan kuat tarik belah, dan balok berukuran (10 x 10 x 40 cm) untuk uji kuat tarik lentur. Dari hasil penelitian didapatkan: (1) Kuat tekan maksimum terjadi pada penambahan serat kawat bendrat pada Vf 1% mengalami peningkatan sebesar 19,33% dari kuat tekan beton Vf0%., (2) Kuat tarik belah maksimum terjadi pada penambahan serat baja karbon 3D Dramix pada Vf 2% mengalami peningkatan sebesar 88,38% dari kuat tarik belah beton Vf0%., dan (3) Kuat tarik lentur maksimumterjadi pada penambahan serat baja karbon 3D Dramix pada Vf 2% mengalami peningkatan sebesar 465,63% dari kuat tarik lentur beton Vf0%.Kata kunci : serat baja karbon 3D Dramix, serat kawat bendrat, kuat tekan, kuat tarik belah, kuat tarik lentur.
Co-Authors Adipati Syahidullah Ulini'am bagus bimantara Bayzoni Bayzoni Corry Jayaputri Sahast Eddy Purwanto Eddy Ristanto Fikri Alami Gatot Eko Susilo Melinda Gusti Mohd Isneini Mohd. Isneini Netta Riana novia puja Nur Mila Putri Philipus Philipus Poppy Nitiranda Faizah Surya Sebayang Suyadi Suyadi Sylvia Dewi Anggraeni Tiffany Marvin Vera Agustriana Vera Agustriana Noorhidana Vera Chania Putri