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Heru Purnomo
Universitas Indonesia
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Journal : construction and material journal

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KAJIAN KUAT TEKAN BETON RINGAN TIDAK TERKEKANG BERAGREGAT KASAR POLIPROPILENA DILAPISI PASIR Waoma, Adolf; Purnomo, Heru; Musalamah, Sittati
Construction and Material Journal Vol. 7 No. 2 (2025): Construction and Material Journal Vol. 7 No. 2 Oktober 2025
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/cmj.v7i2.7522

Abstract

This study aims to determine the compressive strength, density, and crack pattern of lightweight concrete utilizing polypropylene coated with sand as coarse aggregate and Tayan sand as fine aggregate. The research employs three mix design clusters based on the water-to-cement ratio (w/c): Cluster A with a w/c ratio of 0.347, Cluster B with a w/c ratio of 0.339, and Cluster C with a w/c ratio of 0.319. Cylinder-shaped specimens measuring 15×30 cm were prepared for each cluster. For the 15×30 cm cylinder specimens, the average compressive strength obtained was 21.69 MPa, 22.15 MPa, and 24.53 MPa for Clusters A, B, and C, respectively, with standard deviations of 0.59, 0.49, and 1.51. The density of lightweight concrete was recorded as 1717.54 kg/m³, 1689.17 kg/m³, and 1802.93 kg/m³ for Clusters A, B, and C, respectively. The observed crack pattern corresponds to Type 3, in reference to ASTM C39. Keywords: Lightweight Concrete; Polypropylene; Tayan
The Eksperimental Study of Cold Form Steel Closed Box Section 32 mm x 31 x 0,3 mm Under 3 Point Flexural Loading Test Utami, Ghina; Purnomo, Heru; Swastika, Tri Widya
Construction and Material Journal Vol. 7 No. 2 (2025): Construction and Material Journal Vol. 7 No. 2 Oktober 2025
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/cmj.v7i2.7542

Abstract

Cold-formed steel materials are widely used in the construction industry. One such application is closed box cold-formed steel beams, which are commonly used as battens in ceiling structures. Cold-formed steel is produced through cold roll forming or bending processes, resulting in folds along the profile. This study aims to investigate the effects of these folds on stiffness, deflection, ductility, and failure patterns. A total of 18 specimens, with lengths of 500 mm and 1100 mm, were tested using three-point bending tests. The folds were varied in location: placed in the top area, bottom area, and the side area. Tensile coupon tests were also testing to determine the material properties of the cold-formed steel. The results show that beams with a length of 500 mm can carry greater vertical loads compared to those with a length of 1100 mm. Additionally, the displacement and rotation observed in the 500 mm beams were smaller than those in the 1100 mm beams, which more significant deflection and rotation. Beams with folds located in the top area and bottom area shower greater load-carry capacity than those with folds in the web area. The failure patterns of the 500 mm beams were dominantly characterized by excessive deformation in the bottom are due to vertical loading. Similar deformation was observed in the 1100 mm beams. This excessive deformation occurred beneath the point of vertical load application with a roller-type support. Momen capacity of the experimental test results was also compared with the theoretical calculation using the Direct Strength Method, the results showed a comparative value that was almost close, but it is better to modify the formula to the theoretical formula of the Direct Strength Method for cross-sections with folds.
The EXPERIMENTAL STUDY OF COLD-FORMED STEEL CLOSED BOX SECTION 32 MM X 31 MM X 0,3 MM BEAM ON 4-POINT FLEXURAL LOADING Pregawati, Dyah Ayu; Purnomo, Heru
Construction and Material Journal Vol. 7 No. 2 (2025): Construction and Material Journal Vol. 7 No. 2 Oktober 2025
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/cmj.v7i2.7543

Abstract

This study evaluates the effect of beam length and fold position on the flexural performance, deflection, and failure pattern of closed-box cold-formed steel beams with dimensions of 32 mm × 31 mm × 0.3 mm under four-point bending tests. A total of 18 specimens were tested using this method with two length variations, 500 mm and 1100 mm, and fold positions located either on the top flange, bottom flange, or side web. The results show that the 500 mm beams were able to carry greater vertical loads compared to the 1100 mm beams, with smaller mid-span deflections and relatively smaller rotation. In contrast, the 1100 mm beams experienced more significant mid-span deflections and rotations. The presence of folds on the top or bottom flanges increased the beam’s vertical load-carrying capacity by approximately 10% to 15% compared to when the fold was placed on the side web. The failure pattern of the shorter beams was dominated by excessive deformation on the upper part of the beam due to vertical loading, and similar deformation was also observed in the longer beams. This excessive deformation occurred beneath the vertical load application point near the roller support. In addition, comparison with the Direct Strength Method (DSM) revealed that DSM predicted higher flexural moment capacities than those obtained from experiments, M experiment / MDSM ratios ranging from 0.33–0.45 for 500 mm spans and 0.49–0.54 for 1100 mm spans. These results indicate that DSM is more conservative for shorter beams and can serve as a safe preliminary approach for designing cold-formed steel beams subjected to four-point bending.
Co-Authors Abidin, Nurul Achmad, Mohammad Adhela Septiria Wardani Afiqoh Agustin Agus Pamuji Ajeng Titah Normawati Anggraeni, Levina Anisa Nur Rahma Anjarwati, Nely Anjelin, Anggela Ermitha Arel Sabila, Thifan Ariffia, Citrani Natha Arini, Srikandi Wahyu Ariyani, Silvia Aulia Wijayanti, Luluk Dina Azzahra, Melia Ceda, Katarina Aprillia darwan darwan, darwan Devi Anggraini Dewanti, Luthfia Nilam Dewi, Melani Dhiniaty Gularso Dian Fitriyani Dian Puspita Djoeli Satridjo Dorce Sisfiani Sarimin Elly Tjahjono, Elly Epi Saptaningrum Faizatul Muna, Faizatul Muna Farhatuaini, Lia Fatah Zahrasiwi, Reiki Findy Yonanta, Apriliya Fitriya, Fathul Laila Galih Dani Septiyan Rahayu Hadi Suyono Henki W Ashadi Imam Jauhari Maknun, Imam Jauhari Irwan Katili, Irwan Istiqomah Kardi, Tanti Indriyani Kartadarma, Supriyatni KATNI KATNI, KATNI Komalasari, Mahilda Dea Lukitoaji, Beny Dwi Melinda, Tika Morin Prita Laura Mu'awanah, Mu'awanah Muawanah Muawanah Mudhofar, Mohammad Nur Muhamad Nor Mudhofar Muhammad Amien, Muhammad Amien Muhammad Ridho Mumtaza, Nadhila Dzikrina Munawaroh, Raden Roro Zakiyah Murdono, Feryandy Musalamah, Sittati Natasah, Sintia Ngurah Ayu Nyoman Murniati Nikadinata, Vivian Noor Miyono Nugraha, Febby Fajar Nur Khasanah, Fitria Nurahmadani, Anisa Nurizka, Rian Nurul Bahiyah Olanda, Viona Perwitasari, Ningrum Pradita, Erni Praganif Sukarno Pregawati, Dyah Ayu Primastuti, Kurnia Pawestri Purnomo, Sidiq Qatrunnada, Assita Azka Rahma, Fitri Nur Ramadhan, Diky Ramadhani, Dina Suci Ramdhani, Fitri Galuh Ratna Widyawati Rigianti, Henry Aditia Rini Nur Hasanah Rusita Purnamasari Safira, Utin Trisna Saluky Selly Distian Cahya Siti Utami Dewi, Siti Utami Sitirahayu, Sitirahayu Soekarno, Praganif Suhardono Suhardono Sumartono, Ignatius Harry Suradi Efendi Susilo Wirawan Tri Widya Swastika, Tri Widya Triana Rahmawati Triyono, Agung Utami, Ghina Vidliana, Tantri Wahyu Kurniawati Waoma, Adolf Wati, Ririn Asma Widyastuti, Ani widya_ningrum, wiyanda Wijayanti, Luluk Dina Aulia Yasminda, Fitria Ika Ari Yudhistari, Elsa Yulianto, Tomi Yuni Astriani Zela Septikasari, Zela