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Gunaedy Utomo
Universitas Balikpapan
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation

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Influence Plastic Polyethylene Terephthalate as Strong Adhesive Press Paving Block Rosalin Delia; Gunaedy Utomo; Andi Marini Indriani
Potensi: Jurnal Sipil Politeknik Vol. 27 No. 1 (2025): Potensi: Jurnal Sipil Politeknik
Publisher : Department of Civil Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/potensi.v27i1.6342

Abstract

As the population growth and human needs rise, the amount of plastic product waste was increase. Polyethylene Terephthalate (PET) plastic waste is difficult to naturally decomposed, but it can be recycled by using it as a mixture for paving blocks. Paving blocks, commonly utilized in urban infrastructure, present an opportunity for incorporating recycled materials, addressing environmental concerns while maintaining structural integrity. Therefore, this study aims to assess the effectiveness of PET as adhesive and partial replacement for cement in paving block mixtures. Compressive strength was conducted according to SNI 03-0691-1996 standards on paving block containing PET plastic. The experimental test was conducted at the Civil Engineering laboratory of Balikpapan University. The test was carried out using three different mixture compositions, including 30% PET : 70% sand, 40% PET : 60% sand, and 50% PET : 50% sand. The compressive test result showed that mixture of 30% PET: 70% sand produced the highest average compressive strength of 15.87 MPa, which meets the C quality standard and is suitable for pedestrian use. Meanwhile, a mixture of 50% PET: 50% sand produced an average compressive strength of 10.0 MPa, which meets the D quality and is suitable for parks and other uses.
The Effect of Land Slopes Covered with Paving Blocks on Rainwater Infiltration Andi Marini Indriani; Gunaedy Utomo
Jurnal Penelitian Pendidikan IPA Vol 12 No 1 (2026)
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v12i1.12668

Abstract

Rapid urban development has increased impervious surface coverage, causing higher surface runoff and reduced rainwater infiltration that contribute to flooding and groundwater depletion. Permeable pavement systems, such as paving blocks, are widely applied to support sustainable urban water management. This study analyzes the effect of land slope covered with hexagonal paving blocks on rainwater infiltration performance. Laboratory experiments were conducted using a rainfall simulator with a constant intensity of 50 mm/h. Three slope variations were evaluated, namely 0%, 2%, and 4%. The paving blocks had a compressive strength of 25 MPa (Class B) and were installed on a compacted sandy bedding layer. Infiltration and surface runoff volumes were measured at five-minute intervals until stable conditions were achieved. Results indicate that land slope significantly influences infiltration behavior. The highest infiltration performance occurred at a 2% slope, with a maximum infiltration volume of approximately 570 mL recorded between the 40th and 45th minutes. Conversely, the 0% slope showed decreased infiltration due to soil saturation, while the 4% slope exhibited lower efficiency because the increased slope accelerated surface runoff. These findings demonstrate that hexagonal paving blocks installed on a moderate slope enhance infiltration, reduce runoff, and support urban flood mitigation and groundwater recharge.
Pengaruh Metode Pendinginan Pasca Bakar Terhadap Perubahan Kuat Tekan Bata Ringan I Gede Ngurah Swasti; Andi Marini Indriani; Gunaedy Utomo
Jurnal Konstruksi Vol 24 No 1 (2026): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.24-1.3346

Abstract

This study is motivated by the increasing use of lightweight bricks as a modern construction material due to their advantages, including low weight, good thermal insulation, and ease of installation. Foam agent-based lightweight bricks are made from a mixture of fine aggregate from Muara Samu sand, cement, water, and an air-foaming agent. The problem examined in this study is the degradation of material quality due to exposure to high temperatures during fire conditions, which may affect compressive strength. This study aims to determine the effect of burning duration and cooling methods on the compressive strength of lightweight bricks. The method used was a laboratory experiment employing cube specimens with a variation of 8 bar and 2 percent foam agent, which were burned for 20, 40, and 60 minutes. The specimens were then cooled using two methods: without water spraying and with water spraying, followed by compressive strength testing. The results indicate that the initial compressive strength was 1.89 MPa. After burning without water spraying, the compressive strength decreased to 1.53 MPa (20 minutes), 1.34 MPa (40 minutes), and 1.12 MPa (60 minutes). Meanwhile, with water spraying, the compressive strength decreased to 1.47 MPa (20 minutes), 1.28 MPa (40 minutes), and 1.04 MPa (60 minutes). The findings show that the longer the burning duration, the greater the reduction in compressive strength, and that the cooling method using water tends to accelerate the decrease in compressive strength.
Pengaruh Penyerapan Air Terhadap Mortar Busa Yang Digunakan Sebagai Timbunan andi taufik hidayat; Gunaedy Utomo; Andi Marini Indriani
Jurnal Teknologi Terpadu Vol 14 No 1 (2026): JTT (Jurnal Terpadu Terpadu)
Publisher : Pusat Penelitian dan Pengabdian Kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32487/jtt.v14i1.2853

Abstract

Perkembangan di bidang konstruksi mendorong lahirnya berbagai inovasi ramah lingkungan, salah satunya melalui pemanfaatan material timbunan berupa mortar busa. Mortar busa merupakan campuran semen Portland, pasir, udara, dan foam agent yang menghasilkan material ringan dengan karakteristik khusus. Material ini banyak digunakan pada bangunan non-struktural, terutama sebagai pengisi rongga, karena sifatnya yang mudah diaplikasikan, ekonomis, serta mampu menyesuaikan dengan berbagai kebutuhan lapangan. Karakteristik busa mortar sangat dipengaruhi oleh daya serap udara, di mana semakin besar jumlah pori-pori maka semakin tinggi pula penyerapan udara yang terjadi. Tingginya penyerapan udara dapat berdampak pada penurunan kuat tekanan, kerusakan struktur akibat pembengkakan, perubahan warna karena pengelupasan, serta memicu pertumbuhan jamur yang mengurangi umur layak bahan. Selain itu, perbedaan volume pori juga akan menentukan tingkat kestabilan dan ketahanan busa mortar ketika digunakan dalam jangka panjang. Oleh karena itu, penting untuk meninjau secara komprehensif hubungan antara volume pori dan tingkat penyerapan udara dalam busa mortar. Pengetahuan mengenai aspek tersebut diharapkan dapat membantu menghasilkan mutu mortar busa yang lebih baik dan sesuai standar konstruksi penyerapan maksimal 25%. Berdasarkan temuan penelitian sebelumnya, penulis terdorong untuk meneliti lebih lanjut bagaimana proses penyerapan udara mempengaruhi karakteristik fisik busa mortar, khususnya terkait peran volume pori sebagai salah satu faktor utama dalam penyerapan.
Penerapan Metode PDM dan Pert pada Proyek Pembangunan Pusat Layanan Haji dan Umroh Terpadu Kota Balikpapan Azan Yamani Purwanto; Gunaedy Utomo; Reno Pratiwi
Jurnal Talenta Sipil Vol 9, No 1 (2026): Februari
Publisher : Universitas Batanghari Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33087/talentasipil.v9i1.873

Abstract

The construction of the Integrated Hajj and Umrah Service Center (PLHUT) in Balikpapan City is a construction project that requires effective time management to ensure timely completion. This study aims to analyze the critical path and the probability of successful project completion using the Precedence Diagram Method (PDM) and Program Evaluation and Review Technique (PERT). The PDM method is utilized to identify the project’s critical path by structuring the interdependencies of work items, visualized through a network diagram. Meanwhile, the PERT method is employed to calculate the probability of project completion within the planned duration, taking into account the uncertainties in activity durations. Based on the analysis results, the PLHUT construction project in Balikpapan City, with a planned duration of 160 days, contains several critical activities that require careful resource management and scheduling. The probability calculation using the PERT method indicates a high likelihood of completing the project on time. Thus, the combination of PDM and PERT methods serves as an effective approach in construction project management to enhance efficiency and schedule accuracy.
The Comparative Analysis of Bond Strength on Lightweight Concrete Block Surfaces Using Special Adhesive and Conventional Mortar Argya Damuri; Andi Marini Andriani; Gunaedy Utomo
Nusantara Civil Engineering Journal Vol 5 No 1 (2026): Nusantara Civil Engineering Journal (January - June 2026)
Publisher : Civil Engineering Dept, Balikpapan State Polytechnics

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32487/nuce.v4i1.707

Abstract

Indonesia, as an earthquake – prone country, requires wall materials that are strong, efficient, and resistant to cracking. Lightweight concrete blocks have become one of the modern construction alternatives due to their light weight, high dimensional precision, and good thermal and sound insulation properties. However, the bonding quality between blocks remains a determining factor for wall durability under loads and vibrations. This strudy aims to analyze the effect of mixture composition on bond strength and to compare the use of specialized adhesive with conventional mortar. Samples of lightweight concrete blocks were produced using Portland cement type I, local fine aggregates from Muara Samu, water, and foam agent with variations of 2%, 4%, and 6%. The foam agent was incorporated using 4 bar air pressure, and specimens were cured for 28 days according to SNI standards. The test result show that specialized adhesive provides higher bond strength compared to conventional mortar. Bond strength decreases with increasing foam agent content, with average values for specialized adhesive of 0.80 MPa (2%), 0.73 MPa (4%), and 0.69 MPa (6%), while conventional mortar yielded 0.55 MPa (2%), 0.43 MPa (4%), and 0.39 MPa (6%). The largest difference occurred at 6% foam agent, amounting to 42.96%. These findings confirm that the use of local fine aggregates produces lightweight blocks with good bonding quality, while supporting sustainable development through regional resource optimization.
Co-Authors Agus Sugianto Agus Sugianto Amanda Syasya Billah Andi Marini Andriani Andi Marini Indriani, Andi Marini andi taufik hidayat Argya Damuri Azan Yamani Purwanto Eka Al Qurina I Gede Ngurah Swasti Irna Hendriyani Lukman M. Nur Fadhillah Maslina Muhammad Rizqy Nuruddin Kafy El-Ridlo Nurul Fitriyani Olivia Octafiani Rahmat Rahmat Rahmat Reno Pratiwi Rosalin Delia Ryka, Hamriani Siti Nor Aida Sulardi . Yuninda Az’Zahrah Zaerima Zahira Ochtharima