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Larassati, Dian Sukma
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Humanities Civil Engineering, Building, Construction & Architecture Education Engineering Other

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STUDI EKSPERIMEN KUAT LEKAT LEM PADA PASANGAN BETON RINGAN: STUDI EKSPERIMEN KUAT LEKAT LEM PADA PASANGAN BETON RINGAN Wiguna, Edo; Mahbub, Jamal; Lestari, Nor Puji; Setiawan, Adi; Larassati, Dian Sukma
Bangun Rekaprima Vol. 11 No. 1 (2025): April 2025
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/bangunrekaprima.v11i1.6799

Abstract

In modern construction, lightweight bricks are increasingly used as an alternative building material due to their advantages in terms of light weight, ease of installation, and energy efficiency. However, the strength of structures formed from lightweight brick masonry is highly dependent on the quality of the bond between the elements, particularly the use of adhesives such as construction glue. One crucial factor determining the bond strength is the configuration and length of the bonding surface used. This study aims to evaluate the effect of the number of bonding rows on the adhesive bond strength of lightweight brick masonry. Testing was conducted experimentally using one- and two-row bonding configurations. Each sample was subjected to compressive force through a 24.4 mm diameter cylindrical press. Results showed that the two-row configuration produced a higher bond strength, but with a larger coefficient of variation, indicating lower stability of the results. Increasing the bond length actually tended to decrease the bond strength, likely due to uneven distribution of glue and pressure. Furthermore, all test specimens fractured in the brick body, not at the bonding surface, indicating that the adhesive strength had exceeded the tensile strength of the lightweight brick. Regression analysis showed a very strong relationship between compressive force and bond strength, indicating that applied pressure was the dominant factor in bond effectiveness.
EVALUASI KUAT TEKAN BETON DENGAN VARIASI SUBSTITUSI ABU BATU SEBAGAI UPAYA PEMANFAATAN LIMBAH MATERIAL: EVALUASI KUAT TEKAN BETON DENGAN VARIASI SUBSTITUSI ABU BATU SEBAGAI UPAYA PEMANFAATAN LIMBAH MATERIAL Larassati, Dian Sukma; Setiawan, Adi; Wiguna, Edo; Hudaya, Diah Wulansari; Imansyah, Salmaa R. N; Purwanto; Yuono, Sukma Setyo
Bangun Rekaprima Vol. 11 No. 2 (2025): Oktober 2025
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/bangunrekaprima.v11i2.7235

Abstract

Infrastructure development in Indonesia is growing rapidly, necessitating economical and environmentally friendly building materials. Concrete is a key construction material, but the cement-making process produces significant carbon emissions. To reduce environmental impacts, one method is to use industrial waste, such as rock ash, as a substitute for sand in concrete mixes. This study aimed to examine the effect of rock ash use on the compressive strength of K-225 quality concrete after 28 days. Five mixtures were tested with ratios of rock ash ranging from 0% to 100% replacing sand. The results showed that none of the mixtures achieved the desired compressive strength of 225 kg/cm². However, the mixture with 50% rock ash provided the best compressive strength of 194.385 kg/cm² with the lowest standard deviation (8.648 kg/cm²), indicating consistent quality. The decrease in compressive strength at higher rock ash levels was due to the presence of fine particles and silt exceeding the maximum limit. The study concluded that fly ash can be used as a sand substitute up to 50% of the time, provided its quality meets technical standards. The use of fly ash can help save costs, conserve natural resources, and support sustainable development.
ANALISIS PENCAHAYAAN BUATAN DI RUANG KELAS LANTAI 2 GEDUNG SEKOLAH C (SC) POLITEKNIK NEGERI SEMARANG: ANALISIS PENCAHAYAAN BUATAN DI RUANG KELAS LANTAI 2 GEDUNG SEKOLAH C (SC) POLITEKNIK NEGERI SEMARANG Setiawan, Adi; Suwarto; Sudarmono; Santosa, Stefanus; Setyono, Karnawan Joko; Wiguna, Edo; Larassati, Dian Sukma; Imansyah, Salmaa R.N; Hudaya, Diah Wulansari
Bangun Rekaprima Vol. 12 No. 1 (2026): April 2026
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/bangunrekaprima.v12i1.7510

Abstract

Adequate lighting is crucial for supporting comfortable and effective classroom learning. This study evaluated the artificial lighting levels in a second-floor classroom on the C Building of Semarang State Polytechnic using a digital luxmeter. The research method used was to measure artificial lighting locally and generally. The final measurement results were compared to SNI 03-6575-2001, which requires a minimum value of 350 lux for classrooms. The measurements showed that most points had lighting values ​​below 200 lux, indicating that the lighting did not meet the standard. The low lighting levels were caused by several malfunctioning lamps and uneven light distribution due to suboptimal fixture layout and room reflectance. These findings indicate the need for lighting system improvements to enhance visual comfort and support the learning process.
Co-Authors Adi Setiawan Diah Wulansari Hudaya, Diah Wulansari Fachry Abda El Rahman Imansyah, Salmaa R. N Imansyah, Salmaa R.N Lestari, Nor Puji Mahbub, Jamal Purwanto Setyono, Karnawan Joko Stefanus Santosa Sudarmono Sukamto, Ika Sumiyarsi Suwarto Suwarto Wiguna, Edo Yuono, Sukma Setyo