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All Journal Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil BANGUN REKAPRIMA
Harprastanti, Primasiwi
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Humanities Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Engineering Transportation Other

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EFEKTIFITAS PENGGUNAAN BAHAN STABILISATOR BERBASIS POZOLAN PADA TANAH BERBUTIR HALUS DITINJAU DARI SIFAT FISIK DAN MEKANIS TANAH Lestari, Nor Puji; Nikmah, Anisatun; Harprastanti, Primasiwi; Sulistiawati, Baiq Heny
Bangun Rekaprima: Majalah Ilmiah Pengembangan Rekayasa, Sosial dan Humaniora Vol 8, No 1, April (2022): Bangun Rekaprima
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (28.714 KB) | DOI: 10.32497/bangunrekaprima.v8i1, April.3526

Abstract

Kerusakan bangunan struktur maupun bangunan geoteknik lainnya banyak disebabkan oleh kondisi tanah dasar dimana konstruksi tersebut berdiri. Tanah yang baik akan berfungsi untuk menopang konstruksi diatasnya. Salah satu faktor yang menentukan daya dukung tanah adalah parameter kondisi tanah. Tidak semua jenis tanah memiliki karakteristik yang baik sehingga perlu usaha perbaikan tanah. Salah satu upaya untuk memperbaiki sifat tanah lempung tersebut dilakukan dengan stabilisasi tanah. Banyak bahan stabilisasi yang telah digunakan, antara lain semen dan bahan pozolan. Oleh sebab itu pada penelitian ini akan di tinjau efektifitas bahan berbasis pozolan untuk bahan stabilisator tanah. Metode yang digunakan pada penelitian ini adalah metode eksperimental. Tanah yang digunakan adalah tanah di desa Wirosari Kabupaten Grobogan. Kadar campuran yang digunakan adalah 16% dan 20% untuk bagasse ash maupun semen. Efektifitas penggunaan bahan campuran dilihat dari sifat fisik meliputi batas-batas konsistensi tanah dan sifat mekanis dengan uji pemadatan. Dari hasil pengujian dan analisis data diperoleh bahwa tanah asli termasuk jenis tanah berbutir halus kelompok A-7-5 dengan potensi pengembangan sedang. Nilai LL, PL dan PI berturut-turut adalah 77,3%; 60% dan 17,3%. Setelah dilakukan penambahan bahan stabilisator diperoleh tren yang sama untuk setiap campuran, yaitu LL menurun, PL meningkat dan PI menurun. Sedangkan pada sifat fisik kadar campuran tanah-bagase ash 16% memberikan nilai kepadatan yang lebih tinggi di banding campuran tanah semen. Tetapi jika kadar campuran ditambah tren kepadatan tanah akan menurun.
ANALISIS PENAMBAHAN LEM PUTIH POLY VINYL ACETATE TERHADAP SIFAT FISIK DAN MEKANIK BETON 1PC : 2 PS : 3 KR Harprastanti, Primasiwi; Praharseno, Fikri; Supriyadi, Supriyadi; Sukoyo, Sukoyo; Wasino, Wasino
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol. 29 No. 1 (2024): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v29i1.5657

Abstract

The rapid development of concrete nowadays demands us to conduct research or further develop previous research. The goal is to produce higher quality concrete products. This research aims to determine the effect of adding Poly Vinyl Acetate white glue to the physical and mechanical properties of concrete with a ratio of 1PC: 2PS: 3KR. This research was conducted at the Materials Laboratory of the Civil Engineering Department, State Polytechnic of Semarang. The concrete produced in this study is in the form of cylinders with a diameter of 15cm, nine in total, and one beam measuring 15x15x60 cm. The samples produced consist of one sample of normal concrete and four samples with PVAc glue mixtures (2.5%, 5%, 7.5%, and 10%). The research results show that the addition of glue has little effect physically. The percentage results of compressive strength of cylinders at 7 days of age with normal concrete are as follows: PVAc 2.5% increased by 12.96%; PVAc 5% increased by 4.78%; PVAc 7.5% decreased by 14.68%; PVAc 10% decreased by 39.57%. At 14 days of age, with normal concrete: PVAc 2.5% increased by 16.66%; PVAc 5% decreased by 3.65%; PVAc 7.5% decreased by 20.93%; PVAc 10% decreased by 52.10%. At 28 days of age, with normal concrete: PVAc 2.5% decreased by 6.13%; PVAc 5% decreased by 13.24%; PVAc 7.5% decreased by 20.69%; PVAc 10% decreased by 48.86%. As for the flexural strength results of beams at 28 days of age, concrete with PVAc content: 2.5% decreased by 32.09%; 5% decreased by 45.56%; 7.5% decreased by 36.51%; 10% decreased by 33.88%. These results are compared with normal concrete.
PENGENALAN DAN PELATIHAN PENGAMBILAN SAMPEL TANAH DISTURBED DAN UNDISTURBED UNTUK SISWA SMK 7 BIDANG KEAHLIAN KONSTRUKSI JALAN, IRIGASI, DAN JEMBATAN Sulistiawati, Baiq Heny; Harprastanti, Primasiwi; Fatmawati, Leily; Suwarno, Anung; Setyono, Karnawan Joko; Wahyumi, Puji; Sudarmono, Sudarmono; Mahmudi, Wildana Latif
Bangun Rekaprima Vol. 9 No. 2 (2023): Oktober 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/bangunrekaprima.v9i2.5221

Abstract

One of the challenges faced by students from SMK is the learning atmosphere and learning system applied by PTV. This is due to the gap between the SMK curriculum and PTV. State Vocational High School (SMKN) 7 Semarang is one of the vocational schools located in the city of Semarang. SMKN 7 Semarang has 8 expertise competencies, one of which is competence in the field of civil engineering, namely Building Construction, Sanitation and Maintenance (KGSP) and Road, Irrigation, and Bridge Construction (KJIJ). Students of SMKN 7 Semarang already have a basic understanding of civil engineering, but when they enter the PTV world, they still experience difficulties in several fields. Therefore, to bridge and fill the gap from the SMK curriculum to PTV, it is necessary to introduce and train related fields of civil engineering, one of which is field testing. Semarang State Polytechnic as one of the universities has competent human resources to provide solutions to these problems. The PKM team provided introduction and training on the use of hand drill and vane shear tools used for soil testing. The hand drill is used to take disturbed and undisturbed soil samples, while the shear vane is used to determine the shear condition of the soil. After conducting the introduction and training activities, students can better understand how to use the test equipment. In addition, students also understand better in analyzing soil data obtained from testing.
PENERAPAN UJI TANAH DI LAPANGAN UNTUK SISWA SMKN 5 SURAKARTA PROGRAM KEAHLIAN TEKNIK KONSTRUKSI DAN PERUMAHAN Rabinah, Aiun Hayatu; Goro, Garup Lambang; Harprastanti, Primasiwi; Mahbub, Jamal; Risman, Risman; Warsiti, Warsiti; Mulyono, Tedjo; Wiyana, Yustinus Eka; Nurhadi, Imam; Satriyadi, Lilik
Bangun Rekaprima Vol. 10 No. 1 (2024): April 2024
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/bangunrekaprima.v10i1.5494

Abstract

SMKN 5 Surakarta students encountered a challenge during the initial assessment of the civil construction implementation, particularly concerning field soil testing. This challenge was exacerbated by the absence of soil mechanics courses in the curriculum. While the students possessed a fundamental grasp of civil engineering competencies, they faced difficulties in various aspects, with field soil testing being a notable area of concern. To address these competency gaps and enhance the vocational school curriculum, training sessions were conducted to educate students on the practical application of soil tests in the field. The specific training covered sand cone and DCP tests. According to the questionnaire results, post-training, over 50% of SMKN 5 Surakarta students exhibited a clear understanding of how to perform field tests using DCP, Sand Cone, and Speedy Moisture test equipment, along with the ability to analyze the resulting test data. The effectiveness of direct training and intensive mentoring was evident in facilitating students' comprehension of the provided material. Notably, 90% of the students affirmed that the training was easily comprehensible.
PERBANDINGAN PENGGUNAAN LEM POLYURETHANE DAN MORTAR TERHADAP VARIASI WAKTU IKAT TERHADAP KEKUATAN GESER PEREKAT PADA PEMASANGAN BETON RINGAN Harprastanti, Primasiwi; Fikri Praharseno; Wasino; Supriyadi; Agung Rahmatyuda
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol. 30 No. 1 (2025): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v30i1.6546

Abstract

Lightweight concrete is an increasingly popular construction material because of its lightweight and high strength, so effective adhesive technology is needed to increase the adhesion between elements. This study aims to compare the effectiveness of the use of polyurethane glue with MU 380 on the variation of bonding time and shear strength of bonding in the installation of lightweight brick concrete. In this study, tests were conducted on lightweight brick concrete joints using two types of adhesives, namely polyurethane glue and mortar. The variation of bonding time applied to the application of polyurethane glue includes 5, 10, 15, 20, 25, 30, 60, 360, 720, and 1440 minutes. Meanwhile, for mortar adhesive, the bonding time used is 5, 10, 15, 20, 25, 30, 60, 360, 720, and 1440 minutes. After the application of glue and mortar, shear strength testing was carried out to determine how well the concrete joints can withstand shear loads. The results showed that polyurethane glue produced much higher shear strength than mortar at all bonding times tested. The highest average shear strength was obtained at a setting time of 25 minutes for polyurethane glue, which was 21.85 MPa, while the average maximum strength of the mortar occurred at a setting time of 360 minutes with a value of 3.123 MPa. In addition, the shorter setting time of polyurethane glue allows for better installation time efficiency.
PEMANFAATAN POLYURETHANE DENGAN VARIASI VOLUME SEBAGAI PERKUATAN STRUKTUR DINDING BATA RINGAN RUMAH PENDUDUK DI KECAMATAN MIJEN KOTA SEMARANG: PEMANFAATAN POLYURETHANE DENGAN VARIASI VOLUME SEBAGAI PERKUATAN STRUKTUR DINDING BATA RINGAN RUMAH PENDUDUK DI KECAMATAN MIJEN KOTA SEMARANG Widoanindyawati, Vemi; Triwardaya; Harprastanti, Primasiwi; Setiawan, Dedi Budi; Sismedi, Gud
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.v11i1.6504

Abstract

The vulnerability to earthquake hazards in Semarang City is still quite low. Many people have houses that are not yet standardized to the Indonesian National Standards (SNI). Mijen District, Semarang City, is one of the districts that is quite prone to earthquake hazards because of its location close to the source of the Kaligarang fault. Therefore, it is necessary to provide preventive measures and measures for community housing buildings. The house is an earthquake-resistant building and is able to withstand sudden ground movements. By building houses that comply with Indonesian National Standards, it is hoped that damage to the building will be minimized and there will be no loss of life. By using light building materials and strong adhesive between joints, it will increase the ability to withstand seismic loads in a building. In wall construction, you can apply light bricks with polyurethane adhesive because the load caused is relatively light. Apart from being able to strengthen the bond between each layer of brick properly, this adhesive is easy to apply. It is hoped that this adhesive material will be capable of gluing and creating a strong bond in the lightweight brick layers. Varying polyurethane volume is needed to determine the effective and efficient quantity of polyurethane to produce a strong bond. For this reason, "Using Polyurethane with Varying Volumes to Strengthen the Structure of Light Brick Walls of Residents' Houses in Mijen District, Semarang City" is very important as a community service step in presenting innovations that are easy to implement independently by residents in earthquake-prone areas.
Co-Authors Agung Rahmatyuda Anung Suwarno, Anung Fikri Praharseno Goro, Garup Lambang Leily Fatmawati, Leily Lestari, Nor Puji Lilik Satriyadi, Lilik Mahbub, Jamal Mulyono, Tedjo Nikmah, Anisatun Nurhadi, Imam Praharseno, Fikri Puji Wahyumi, Puji Rabinah, Aiun Hayatu Risman Risman S.T., M.T., DEDI BUDI SETIAWAN Setyono, Karnawan Joko Sismedi, Gud SUDARMONO SUDARMONO Sukoyo Sukoyo Sulistiawati, Baiq Heny Supriyadi Supriyadi Supriyadi Triwardaya Vemi Widoanindyawati Warsiti Warsiti Wasino Wasino Wasino Wildana Latif Mahmudi, Wildana Latif Yustinus Eka Wiyana, Yustinus Eka