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All Journal Jurnal Teknik ITS IPTEK The Journal for Technology and Science Journal of Civil Engineering INOVTEK POLBENG Journal of Infrastructure and Facility Asset Management
Wahyuniarsih Sutrisno
Department Of Civil Engineering Institut Teknologi Sepuluh Nopember
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Energy Engineering Environmental Science Library & Information Science Mathematics Transportation

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Strength Reduction Factor of Square Reinforced Concrete Column Using Monte Carlo Simulation Wahyuniarsih Sutrisno; Bambang Piscesa; Mudji Irmawan
Journal of Civil Engineering Vol 35, No 2 (2020)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v35i2.8657

Abstract

This paper investigates the strength reduction factor (f) of reinforced concrete (RC) columns using Monte-Carlo simulation (MCS). The main objective of this paper is to evaluate the strength reduction factor of the RC using the authors' developed code. This code is important for further research to check other important effects when high-strength materials are used. The investigated RC column concrete compressive strengths (fc) are 40 and 60 MPa while the rebar strengths (fy) are set to 320, 400, and 500 MPa. Fiber-based cross-sectional analysis is used to compute the axial-moment interaction capacity of the RC column. The concrete compressive block is used to model the concrete contribution and the bilinear stress-strain model is adopted for the rebar. These simplifications can reduce the difficulties when solving the equilibrium of the forces in the sectional analysis. The parameters used in the sensitivity analysis of the strength reduction factor (f) are the concrete compressive strength (fc), the rebar yield strength (fy), the longitudinal rebar ratio (r), and the column size (b,h). The effect of the coefficient of variations for each material on the resistance variation coefficient of the RC is also investigated. From the analysis, it can be concluded that when the RC column falls in the tension-controlled region, the obtained strength reduction factor is 0.93 which is slightly higher than the value of f in ACI 318-19. On the other hand, when the RC column falls in the compression-controlled region, the obtained strength reduction factor is 0.6 which is lower than the value of f in ACI 318-19 which is 0.65.
SORPTIVITY AND CHLORIDE PENETRABILITY EVALUATION OF CONCRETE INCORPORATING FLY ASH AND SILICA FUME Wahyuniarsih Sutrisno; Gabriel Ghewa; Priyo Suprobo
Journal of Civil Engineering Vol 34, No 2 (2019)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v34i2.6576

Abstract

Diffusion is believed to be the main mechanism of fluid ingress into the concrete. However, in partially saturated concrete, the fluid will mainly be absorbed by the capillary suction mechanism, which associates with the sorptivity properties of the concrete. This paper presents the results of an experimental program to investigate the influence of Portland cement substitution with Silica Fume (SF) and Type F Fly Ash (FA) on the rate of absorption, which also known as sorptivity, and chloride penetration of concrete. The sorptivity of the concrete was evaluated according to ASTM 1585, while the chloride penetration was evaluated according to ASTM C 1202. By substituting part of cement with FA and SF, it was found that the sorptivity of concrete is reduced. Furthermore, all type of concrete with supplementary material, including CFA, CSF and CSM, is confirmed to enhance the ability of concrete to resist chloride penetration compared yo normal concrete (NC).
Strength reduction factor evaluation of the circular reinforced concrete column with varying eccentricity ratio (e/h) Wahyuniarsih Sutrisno; Mudji Irmawan; Dwi Prasetya
Journal of Civil Engineering Vol 35, No 1 (2020)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v35i1.7788

Abstract

This paper presents strength reduction factor evaluation of circular reinforced concrete column with varying eccentricity ratio (e/h) using the first-order-reliability-methods. The resistance properties of the reinforced concrete column is estimated using the monte-carlo simulation with random normally distributed material properties. Only dead and live load combination considered in the analysis. The parameters being investigated when evaluating the resistance of the reinforced concrete column are the concrete compressive strength, steel yield strength, coefficient of variation for both the concrete and steel materials, reinforced concrete column size, and the longitudinal reinforcement ratio. When evaluating the strength-reduction factor, the safety index values are 3.0, 3.5, and 4.0. From the analysis, it was found out that the strength reduction factor, for e/h higher than one and with safety index equal to 3.0, was equal to 0.9 which agrees well with the ACI 318 strength reduction factor for tension-controlled region. However, for e/h lower than one and safety index equal to 3.0, the strength reduction factor was equal to 0.6 which was lower than the ACI 318 strength reduction factor for compression-compression controlled region.
Investigation of Water Absorption for Concrete Using Supplementary Materials Gabriel Jose Posenti Ghewa; Priyo Suprobo; Djoko Irawan; Sutrisno Wahyuniarsih; Tambusay Asdam
IPTEK The Journal for Technology and Science Vol 31, No 3 (2020)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v31i3.5596

Abstract

Concrete’s durability is the key factor that affects the service life of the concrete structure. One factor that affects the durability properties of concrete is its pore structure, which can be investigated by analyzing the materials’ absorption rate. For the structures with direct contact with water, water absorption can change the pore structure’s behavior, affecting the durability of the conc in the long term rate. It is important to research to find the water absorption properties of concrete with different mixtures. This research investigates the rate of absorption of concrete by using fly ash and silica fume. Based on secondary absorption properties, the result shows that 15% fly ash in normal concrete increases the resistance to water penetration by 23%. The usage of 5% Silica Fume increases the resistance by 11.8%. The usage of 5% silica fume + 10% fly ash increases the resistance by 16.2%. It shows that the use of supplementary materials in concrete increases the resistance of water penetration. In this research, the usage of 15% fly ash as cement replacement shows the best result.
Prediction of Rust Thickness in Reinforced Concrete Structures to Enhanced the Asset Management for Coastal Infrastructures Wahyuniarsih Sutrisno; I Ketut Hartana; Priyo Suprobo
Journal of Infrastructure & Facility Asset Management Vol 1, No 2 (2019): Journal of Infrastructure & Facility Asset Management
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1274.86 KB) | DOI: 10.12962/jifam.v1i2.5969

Abstract

Corrosion in reinforced concrete structure is a serious problem, especially for coastal infrastructure. Managing the coastal infrastructure from corrosion is a really essential action to make sure that the infrastructure can be used properly throughout its service live. This research focused on analyzing the rust thickness on steel reinforcement due to corrosion. Series of corrosion test using galvanostatic was performed in this research. Furthermore, a predictive model based on Farraday’s Law with uniform corrosion assumption also developed in this research and compared with the experimental data. Based on the simulation result, it was found that the predictive model of rust thickness based on Farraday’s Law is capable to simulate the corrosion process and thickness of the rust.
Characteristics of Silica Sand Shipyard Sandblasting Waste as Construction Materials Kiki Dwi Wulandari; Widya Emilia Primaningtyas; Benedicta Dian Alfanda; Wahyuniarsih Sutrisno
INOVTEK POLBENG Vol 12, No 2 (2022): INOVTEK Vol 12, No 2
Publisher : POLITEKNIK NEGERI BENGKALIS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35314/ip.v12i2.2865

Abstract

Silica sand as by-product waste is a major contributor to the volume of waste generated by sandblasting activities in the shipping industry. Based on a survey conducted during 2020-2022, silica sand in the shipping industry in East Java is around 450 tons/year. Silica sand has potential utilization based on its material characteristics, similar to natural sand in construction materials. This research analyzed the characteristics of silica sand from sandblasting waste to develop as construction material. The tests carried out included physical properties (particle size and shape, specific gravity, moisture content, absorption, mud content, specific gravity, and organic content) and chemical properties (X-Ray Fluorescence (XRF) and Scanning Electron Microscope-Energy Dispersive X-Ray tests (SEM-EDX)). The results show that silica sand from sandblasting waste has 548.93 ± 6.46 m average particle size, 2.730 t/m3 specific gravity angular grain with medium sphericity, 0.06% water content, 3.381% absorption capacity, 1.22% mud content, 0.09 kg/liter bulk density, and a clear solution on the organic content test. As chemical content of sandblasting waste, the amount of SiO2, Al2O3, Fe2O3, and CaO are 93.02%, 1.02%, 2%, and 0.63%, respectively. This research concluded that shipyard sandblasting waste has characteristics that can be used as fine aggregate for sustainable building construction materials.
Modifikasi Perencanaan Struktur Apartemen Alessandro Vittorio dengan Metode Beton Pracetak Zein Farid Vicky Mahendra; Wahyuniarsih Sutrisno; Ahmad Basshofi Habieb
Jurnal Teknik ITS Vol 12, No 2 (2023): IN PRESS
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23373539.v12i2.114560

Abstract

Gedung Apartemen Alessandro Vittorio merupakan gedung yang berlokasi di Surabaya dan memiliki 28 lantai. Dalam pembangunannya, Gedung Apartemen Alessandro Vittorio masih menggunakan metode konvensional berupa metode cor in situ pada struktur balok, kolom, dan pelatnya. Atas dasar ini penulis merencanakan ulang gedung Apartemen Alessandro Vittorio, dengan menggunakan metode beton pracetak dengan maksud untuk menghasilkan sebuah rancangan baru yang dapat lebih cepat dan efisien dilaksanakan tanpa mengurangi mutu dari rancangan aslinya. Dalam perencanaan ulang gedung Apartemen Alessandro Vittorio, penulis mengubah denah dari Tower A dimana akan dipisah dengan tower yang lain. Namun, sistem gedung yang digunakan tetap sama, yaitu sistem struktur ganda dengan rangka pemikul khusus momen disertai dengan dinding geser beton bertulang. Hasil dari modifikasi Gedung Apartemen Alessandro Vittorio dengan metode pracetak ini meliputi ukuran balok induk 30/45, 35/60, dan 45/70, ukuran balok anak 25/40 dan 30/45, serta ukuran kolom 110/90, 90/70, 80/60, dan 50/50. Modifikasi gedung ini juga menggunakan shear wall serta sambungan antar elemen pracetak menggunakan sambungan basah dan konsol pendek.
INVESTIGATION OF THE EFFECT OF SANDBLASTING WASTE TREATMENT METHOD AS NANO-SILICA ON THE COMPRESSIVE STRENGTH OF CONCRETE MORTAR Muhammad Zainal Abidin; Wahyuniarsih Sutrisno; Rahmat Dwi Sutrisno
Journal of Civil Engineering Vol 38, No 2 (2023)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v38i2.17125

Abstract

This study presents the effect of nano-silica (NS) from sandblasting waste as an additive on the mechanical properties of concrete mortar. The nano-silica was produced by using the sol-gel and mechanical grinding methods. In this research, nano silica material was added as an additive with a percentage varying from 0% to 5%. The results show that producing nano silica from sandblasting waste with a combination of sol-gel and mechanical grinding methods can produce an average size of 148.9 nm with 96.90% purities silica (SiO2). The compressive strength test also shows that adding NS can increase the compressive strength of the concrete. The highest compressive strength obtained from this research was. 29.76 MPa with the addition of 1% of nano-silica. This compressive strength is 37.5% higher than the control mixture.
Co-Authors Ahmad Basshofi Habieb Asdam Tambusay Bambang Piscesa Benedicta Dian Alfanda Djoko Irawan Gabriel Ghewa Gabriel Jose Posenti Ghewa I Ketut Hartana Irmawan, Mudji Kiki Dwi Wulandari Mudji Irmawan Muhammad Zainal Abidin Prasetya, Dwi Priyo Suprobo Rahmat Dwi Sutrisno Widya Emilia Primaningtyas Zein Farid Vicky Mahendra