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All Journal Publikasi Riset Orientasi Teknik Sipil (Proteksi) Jurnal Rekayasa Infrastruktur Sipil Abdimas Indonesian Journal
Lalu Samsul Aswadi
Universitas Tidar
Religion Civil Engineering, Building, Construction & Architecture Economics, Econometrics & Finance Education Engineering Industrial & Manufacturing Engineering Social Sciences Transportation

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ANALISIS PERBEDAAN SIGNIFIKANSI PENGARUH INDIKATOR-INDIKATOR KUALITAS LAYANAN TERHADAP KEPERCAYAAN PENGGUNA JASA KONSTRUKSI Herlita Prawenti; Achmad Rafi’ud Darajat; Lalu Samsul Aswadi
Jurnal Rekayasa Infrastruktur Sipil Vol 1, No 2 (2020): Jurnal Rekayasa Infrastruktur Sipil
Publisher : Universitas Tidar

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (535.346 KB) | DOI: 10.31002/.v1i2.3390

Abstract

Adanya suatu pemahaman bahwa semakin banyaknya pesaing, semakin kritisnya rekanan/klien, semakin tipisnya prospek profit, dan perusahaan konstruksi semakin dituntut untuk dapat menjaga dan mempertahankan keberlangsungan perusahaannya. Indikator-indikator utama yang digunakan pada penelitian ini yaitu  dimensi dari Kualitas Layanan dan indikator tambahan lainnya yang diperoleh dari pengembangan penelitian yang telah dilakukan diIndonesia, sehingga mendapatkan indikator yang lebih komperhensif. Dari indikator tersebut dilakukan survei kepada sejumlah responden. Instrumen penilaian dalam penelitian ini menggunakan kuesioner tertutup dan terbuka yang memberikan  indikator-indikator Kualitas Layanan dalam skala tingkat signifikansi (skala 1-5) yang mempengaruhi kepercayaan Pengguna Jasa. Dari hasil survei tersebut, dilakukan pengolahan data dengan menggunakan analisis statistik deskriptif untuk dianalisis mengenai perbedaan yang signifikan antara persepsi Pemilik dan konsultan MK sebagai Pengguna Jasa Konstruksi.
STUDI EKSPERIMENTAL MODULUS OF RUPTURE DAN MODULUS OF ELASTICITY LAMINATED VENEER LUMBER KAYU SENGON Lalu samsul Aswadi; Dwi Sat Agus Yuwana; Herlita Prawenti
Jurnal Rekayasa Infrastruktur Sipil Vol 2, No 1 (2021): Jurnal Rekayasa Infrastruktur Sipil
Publisher : Universitas Tidar

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (602.829 KB) | DOI: 10.31002/.v1i2.3392

Abstract

Paraserianthes falcataria atau dikenal dengan kayu sengon merupakan spesies kayu yang cepat tumbuh tetapi memiliki kekuatan yang rendah sehingga penggunaannya dibatasi hanya untuk elemen non-struktural saja. Salah satu cara untuk meningkatkan kekuatan kayu sengon yaitu dengan teknologi LVL (Laminated Veneer Lumber).Penelitian ini bertujuan untuk mendapatkan nilai Modulus of Rupture (MOR) dan Modulus of Elasticity (MOE) LVL kayu Sengon dari pengujian lentur secara eksperimental. Hasil penelitian ini diharapkan dapat memberikan sumbangan ilmiah untuk basis data sifat mekanika kayu Indonesia dan khususnya untuk perencanaan komponen struktur tekan dan lentur. Benda uji LVL kayu Sengon sebanyak 8 buah dengan dimensi 480 mm x 80 mm x 40 mm ditumpu di kedua ujungnya. Benda uji kemudian diberi beban lentur ditengah-tengah secara beangsur-angsur sampai benda uji runtuh. Kemudian dicatat berapa beban yang mampu ditahan oleh masing-masing benda uji. Dari hasil pengujian kuat lentur tersebut kemudian dihitung Modulus of Rupture (MOR) dan Modulus of Elasticity (MOE) LVL kayuSengon dari masing-masing benda uji.Dari pengujian didapatkan hasil MOR dari 8 benda uji berturut-turut yaitu 30,08 Mpa, 39,14 Mpa, 39,14 Mpa, 33,96 Mpa,  35,90 Mpa, 38,17 Mpa, 39,78 Mpa dan 31,70 Mpa dengan nilai rata-rata MOR dari 8 benda uji adalah 35,98 Mpa.  Hasil dari nilai MOE untuk 8 benda uji berturut-turut adalah 3436,36 Mpa, 3306,12 Mpa, 3306,12 Mpa, 3497,14 Mpa, 3469,88 Mpa, 3888 Mpa, 3353.23 Mpa dan 3351,72 Mpa dengan nilai rata-rata MOE dari 8 benda uji adalah 3451,07 Mpa.
Pengaruh FAS Terhadap Kuat Tekan Beton Dari Agregat Sungai Krasak Aswadi, Lalu Samsul; Yuwana, Dwi Sat Agus
Abdimas Indonesian Journal Vol. 5 No. 1 (2025)
Publisher : Civiliza Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59525/aij.v5i1.633

Abstract

Concrete construction is widely used by the community, for example, building construction, bridge construction, port construction, girder construction, and others that require determining the quality of concrete. The use of concrete for protected and unprotected areas differs. In general, the community uses concrete construction for road hardening and for building their homes. In general, when mixing concrete, the water used during mixing tends to be free, without important rules, making it easy to work. This will affect the quality or grade of concrete. The research on the effect of water-cement ratio (W/C) on the compressive strength of concrete from Krasak river aggregates, as the main material that is currently widely available in the Krasak River, Pabelan River, and Kali Putih River. In these places, sand with various sizes and split or crushed stone from various stone crusher companies are available. This research follows the Indonesian National Standard (SNI) on the Selection of Concrete Mixtures for Normal Concrete, Heavy Concrete, and Mass Concrete. The concrete mixing is done with a volume ratio of 1pc:2ps:2split with six variations of W/C, namely 0.37, 0.46, 0.55, 0.61, 0.64, and 0.73. The sand and split materials are tested according to SNI, namely the testing of fine aggregate and coarse aggregate materials. Mix design is performed based on the data of fine and coarse aggregates. The test objects are made by mixing materials such as cement, sand, gravel, and water. The mixing is carried out by testing the fresh concrete or slump and making cylindrical test objects and soaking them for 28 days. Then, the compressive strength of the concrete is tested. The compressive strength test results show that the W/C ratios of 0.37, 0.46, 0.55, 0.61, 0.64, and 0.73 with slump values of 0, 3, 5, 8, 14, and 18 cm produce compressive strengths of 9.90, 13.75, 14.62, 20.18, 13.50, and 6.97 kg/cm2, respectively. From the test results, it can be seen that the best W/C ratio is 0.61 with a compressive strength of 20.18 kg/cm2.
The Effect of Compressive Strength of Concrete with Styrofoam Waste Cement Coating on Acid Solution and Water Permeability: Pengaruh Kuat Tekan Beton Dengan Coating Cement Limbah Styrofoam Terhadap Larutan Asam Dan Permeabilitas Air Sarjano, Belany Try Aji; Aswadi, Lalu Samsul; Yuwana, Dwi Sat Agus
PUBLIKASI RISET ORIENTASI TEKNIK SIPIL (PROTEKSI) Vol 7 No 1 (2025): Vol 7 No 1 (2025)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/proteksi.v7n1.p8-16

Abstract

This research analyze the effect of styrofoam cement coating as a protective layer on normal concrete in terms of physical quality and compressive strength when exposed to Natrium Sulfat acidic solution. Styrofoam-based cement coating is chosen due to water-resistant physical properties and its ability to reduce difficult-to-decompose waste. The method related to the effect of cement styrofoam coating as a liner with cylindrical concrete test objects measuring 15 cm in diameter and 30 cm in height and a quality of fc' 20 MPa, where its implementation is based on SNI 7656-2012. The cement coating used utilizes various mixture ratios of 0%, 40%, 50%, and 60% of the solvent weight in the form of Pertalite. The process of immersion in sodium sulfate acid solution, compressive strength testing, and permeability testing were conducted in the Laboratory, Universitas Tidar. The results indicate that the addition of styrofoam cement coating can reduce the corrosive impact of Natrium Sulfat acidic solution. The 60% styrofoam mixture variation showed the best results in three testing aspects: a post-curing compressive strength test value of 21.3621 MPa, a post-immersion in Natrium Sulfat acidic solution compressive strength test value of 20.7680 MPa, and a permeability test value of 7.03x10-9.
Evaluation of Parking Characteristics and Parking Demand with PTV Vissim 8.0 at Rejowinangun Market, Magelang: Evaluasi Karakteristik dan Kebutuhan Parkir Menggunakan PTV Vissim 8.0 di Pasar Rejowinangun Magelang Soebari, Hashifah Putri; Woro Partini Maryunani; Lalu Samsul Aswadi
PUBLIKASI RISET ORIENTASI TEKNIK SIPIL (PROTEKSI) Vol 7 No 1 (2025): Vol 7 No 1 (2025)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/proteksi.v7n1.p41-46

Abstract

Rejowinangun Market is  traditional market in Magelang City.  Volume of vehicles in the parking area is also expected to increase. Therefore, this study aims to evaluate the characteristics, layout arrangement, and parking needs in the Rejowinangun market to better understand the current situation in the parking area. Research was conducted using the cordon survey method and direct observation at 06.00-08.00 and 12.00-14.00 on three days.  The results indicate that the highest occupation of the parking area occurred of 1,468 motorcycles and 40 cars parked during the observation period. The number of parked vehicles at 489 motorcycles and 23 cars. The parking turnover rate at 3.231 and 3.778 for motorcycles and cars. Importantly, the parking index that the current parking area is overloaded with cars (index value of 115%), which is not the case for motorcycles (index value of 46%). Parking model with PTV Vissim shows the highest occupancy on the second floor, with values of 54.63% and 52.35% for motorcycles and cars. The highest level of parking block space (0.04%) was found in the motorcycle parking area on the second floor. The validity further shows that the parking model is valid and therefore the results of this study are reliable.
Co-Authors Achmad Rafi’ud Darajat dwi sat agus yuwana Sarjano, Belany Try Aji Soebari, Hashifah Putri Woro Partini Maryunani yuwana, dwi sat agus