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Imansyah, Salmaa R. N
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Humanities Civil Engineering, Building, Construction & Architecture Education Engineering Other

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Journal : BANGUN REKAPRIMA

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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.
PENINGKATAN KOMPETENSI TENTANG UJI KAPASITAS DUKUNG TANAH DI LAPANGAN UNTUK SISWA SMK NEGERI PRINGSURAT : PENINGKATAN KOMPETENSI TENTANG UJI KAPASITAS DUKUNG TANAH DI LAPANGAN UNTUK SISWA SMK NEGERI PRINGSURAT Rabinah, Aiun Hayatu; Harprastanti, Primasiwi; Mahbub, Jamal; Goro, Garup Lambang; Risman; Warsiti; Mulyono, Tedjo; Nurhadi, Imam; Himam, Muhamad Khudza Alfi; Imansyah, Salmaa R. N
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.v12i1.7636

Abstract

One of the challenges faced by students from SMKN Pringsurat in the civil construction implementation survey was related to field soil testing. Generally, SMKN Pringsurat students already have a basic understanding of civil engineering competencies, but still experience difficulties in several areas, particularly field soil testing. Therefore, to improve competency, training was conducted on the application of concrete testing in the field. The training focused on soil bearing capacity testing for SMKN Pringsurat. Based on questionnaire results, after the training, an average of >60% of SMKN Pringsurat students were able to correctly understand and understand the soil testing procedure in the field using the DCP tool, as well as how to analyze the test data. Direct training and intensive mentoring were effective methods, making it easier for students to absorb the material. 70% of students stated that the training was easy to understand.
Co-Authors Aiun Hayatu Rabinah Diah Wulansari Hudaya, Diah Wulansari Goro, Garup Lambang Harprastanti, Primasiwi Himam, Muhamad Khudza Alfi Iye, Risman Larassati, Dian Sukma Mahbub, Jamal Mulyono, Tedjo Nurhadi, Imam Purwanto Sukamto, Ika Sumiyarsi Warsiti Wiguna, Edo Yuono, Sukma Setyo