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All Journal Jurnal Penelitian Saintek Inersia : Jurnal Teknik Sipil dan Arsitektur MEDIA KOMUNIKASI TEKNIK SIPIL Teknik Sipil dan Arsitektur Journal of Degraded and Mining Lands Management Teras Jurnal U Karst Civil Engineering Journal Jurnal Pendidikan Teknik Sipil (JPTS) Journal of Engineering and Applied Technology

Slamet Widodo

Department Of Civil Engineering, Faculty Of Engineering, Universitas Negeri Yogyakarta, Indonesia

Author-ID : 2841209

Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Engineering Environmental Science Languange, Linguistic, Communication & Media Mechanical Engineering Social Sciences

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EFEK PENAMBAHAN SERAT POLYPROPYLENE TERHADAP KARAKTERISTIK BETON SEGAR JENIS SELF-COMPACTING CONCRETE Widodo, Slamet
MEDIA KOMUNIKASI TEKNIK SIPIL Tahun 17, Nomor 2, JUNI 2009
Publisher : Department of Civil Engineering, Diponegoro University

The Self-Compacting Concrete (SCC) can be defined as a type of concrete that able to flow and consolidate under its own weight, completely fill the formwork even in the presence of dense reinforcement, maintaining its homogeneity and without the need for any additional compaction. Similar with other types of cement-based materials, SCC also has a brittle characteristic. This problem can be encountered by adding fibers in to the concrete mix. Unlike its effects to hardened concrete, the presence of fibers in concrete mixes can cause significant deterioration to the concrete workability. This research was conducted to investigate effects of polypropylene fiber addition on four key characteristics of SCC in the fresh state. In this research, concrete mixes were prepared containing 0, 0.05, 0.10, and 0.15 percent volume fraction of polypropylene fibers. Fresh properties were evaluated based on its passing ability, flowability, viscosity, and segregation resistance using J-ring, Slump flow, and Sieve Segregation Resistance tests. Test results indicate polypropylene fibers reduce flowability and passing ability but will increase viscosity and segregation ratio of SCC. Furthermore, it can be concluded that polypropylene fiber reduce deformability of SCC in the fresh state. It can be suggested that polypropylene fibers allowed to be added into SCC mixes up to 0.10 percent by volume of concrete. KeywordsÂ Â : Self-Compacting Concrete, Polypropylene fiber, Fresh characteristics ABSTRAK Self-Compacting Concrete (SCC) adalah jenis beton dengan daya alir yang sangat baik dan mampu memadat secara mandiri. Penambahan serat dalam beton segar dapat menyebabkan perubahan karakteristik beton segar. Dengan demikian, perlu dilakukan penelitian untuk memperoleh campuran adukan beton segar yang memenuhi persyaratan deformability dan ketahanan segregasi SCC. Penambahan serat polypropylene diberikan sebesar 0%, 0,05%, 0,1%, dan 0,15%, berdasarkan volume beton. Evaluasi dilakukan terhadap empat karakteristik utama beton segar SCC, yaitu: flowability (slump-flow), viscosity (T500), passing ability (J-Ring Test), dan ketahanan segregasi (GTM screen stability test). Penambahan serat polypropylene menyebabkan berkurangnya flowability SCC. Kondisi SCC masih dapat dicapai saat serat polypropylene ditambahkan sebesar 0,10% dari volume beton dengan slump-flow 556 mm. Pada penambahan 0,15% beton segar tidak dapat memenuhi syarat flowability SCC dengan slump-flow 428 mm. Penambahan serat polypropylene menambah viskositas SCC. Kondisi SCC masih dapat dicapai saat serat polypropylene ditambahkan sampai dengan 0,10% dari volume beton dengan T500 1,40 detik. Pada penambahan 0,15% beton segar melampaui batas maksimal viskositas SCC, dimana nilai T500 sudah tidak terukur. Penambahan serat polypropylene menurunkan passing ability SCC. Kondisi SCC masih dapat dicapai saat serat polypropylene ditambahkan sampai dengan 0,10% dari volume beton dengan beda elevasi 7,9 mm. Pada penambahan 0,15%, beton segar tidak dapat memenuhi syarat minimal passing ability SCC dimana beda elevasi mencapai 10,6 mm. Penambahan serat polypropylene mengurangi rasio segregasi SCC. Semua varian dalam penelitian ini dapat memenuhi syarat rasio segregasi beton segar SCC. Kata KunciÂ Â Â Â Â Â : Self Compacting Concrete, Serat Polypropylene, Karakteristik Beton Segar

PENGARUH KOMPOSISI CAMPURAN TERHADAP DURABIUTAS HIGH-FLOWABLE CONCRETE PADA PENGECORAN BETON DI RAW AH AIR Slamet Widodo; Sri Haryono
Jurnal Teknik Sipil dan Arsitektur Vol. 2 No. 6 (2003): jurnal teknik sipil dan arsitektur
Publisher : Fakultas Teknik Universitas Tunas Pembangunan Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Concrete that used for under water construction need to be proportioned to spread readily and self consolidate.Â High Flowable Concrete (HFC) is a kind of High Performance Concrete (HPC) that able to spread readily (flowability more than 50 cm according to BS â€“ 1881). This kind of concrete can be resulted by using higher water/binder ratio or adding some High Range Water Reducer (HRWR) agent. This reseacrh proposed to evaluate effects of water/binder ratio and High Range Water Reducer based on polycarboxylatether (Sika Viscocrete-5) dosage on fresh concrete properties, compressive strength and water absorption of underwater concrete. The research has done with o,40 and 0,45 water/binder ratio and 0.3, 0.6, 0.8, 1.0 and 1.3 percent of HRWR by total wight of binder. 30 cubes (15cm x15cm x15cm) of underwater concrete Â were used for absorption examination according to ASTM C-127-68 underwater concrete cylinders (Ã˜ 15cm x 30cm) were investigated for compressive strength in 56 days. Test result indicates that HRWR based on polycarboxylatether could improve flowability up to 3.24 % for 0.4 water per binder ratio and 23.90 % for 0.45 w/c. High Range Water Reducer also improve durability of underwater concrete, indicates by the reduction of water absorption up to 11.11 % for 0.4 water per binder ratio and 18.28 for 0.45 water per binder ratio. Better durability of underwater concrete could be obtained by reducing the value of water per binder ratio that indicated by lower water absorption.

Identification of subsidence hazard zone by integrating engineering geological mapping and electrical resistivity tomography in Gunung Kidul karst area, Indonesia Wahyu Wilopo; Doni Prakasa Eka Putra; Teuku Faisal Fathani; Slamet Widodo; Galeh Nur Indriatno Putra Pratama; Maris Setyo Nugroho; Wisnu Rachmad Prihadi
Journal of Degraded and Mining Lands Management Vol 9, No 2 (2022)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2022.092.3281

The presence of natural cavities in karst morphology may cause severe civil engineering and environmental management problems. Karst formations will limit the expansion of urbanization, especially infrastructure development in limestone areas. Geophysical methods, especially electrical resistivity tomography (ERT) techniques, are effective and efficient solutions to detect voids below the surface. This study aimed to develop a subsidence hazard map as basic information for infrastructure development. The identification was made by measuring electrical resistivity tomography on eight profiles in the infrastructure development plan. In addition, it was also supported by geological mapping, particularly the structural geology and types of rocks around the site. The research area consists of massive limestone, bedded limestone, and cavity limestone with generally north-south joints. The analysis of geological mapping data and electrical resistivity tomography measurements showed that the cavity limestone was identified with a north-south elongated pattern in line with the fracture pattern found on the surface at the research area. The surface lithology type, the geological structures density, and the subsurface lithology were used to develop a subsidence hazard map. This information is beneficial in determining the safe location of infrastructure development based on disaster risk mitigation.

PERFORMANCE OPTIMIZATION OF BEAM CONCRETE BEAMS TO INCREASE BUILDING STRUCTURE PERFORMANCE IN EARTHQUAKE AREA Agus Santoso; Slamet Widodo; Nuryadin Eko Raharjo
Jurnal Penelitian Saintek Vol 15, No 2: Oktober 2010
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The paper summarizes the experimental result of flexural capacity of full scale reinforced concrete beam prepared as a composite members consisting of two concrete layers made of Hybrid Fiber Reinforced Concrete (HFRC) and High Strength Concrete (HSC). Compressive strength and modulus of elasticity test, splitting tensile, flexural tensile tests conducted to identify the important mechanical properties of both HFRC and HSC. Every mechanical properties data collected using 3 standard samples based on ASTM and SNI codes. 15 reinforced concrete beams in 150x250x2400 mm dimensions, usedfor full scale flexural test of structural RC beam. The tests conducted on 5 types of composite beam: 100%, 75%, 50%, 25%, and 0% of HSC cross sectional depth, combined with HFRC for the opposite sides.The experimental results indicated that HFRC shows higher modulus elasticity compared with HSC, it was 28618,611MPafor HFRC, and 21790,660 MPafor HSC. All types of composite members and full depth of HFRC shows higher first crack load capacity compared with HSC structural reinforced concrete beam. The first crack load capacity increase ranging from 29,753% up to 33,267%. All types of composite members and full depth of HFRC also shows higher maximum load capacity compared with HSC structural reinforced concrete beam. The first crack load capacity increase ranging from 11,284% up to 16,03%. Based on the experimental test results, it can be suggested to apply partial depth of HSC and HFRC; 50% HSC and 50% HFRC on static determinate RC beam.Keywords: Composite Reinforced Concrete Beam, HFRC, HSC, Full Scale Flexural Test

ANALISIS HOMOGENITAS SELF COMPACTING MORTAR MENGGUNAKAN SERAT POLYPROPYLENE BERDASARKAN KECEPATAN PERAMBATAN GELOMBANG ULTRASONIK (UPVM) Faqih Ma’arif; Slamet Widodo; Agus Santoso
Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 7, No 2 (2011): Desember
Publisher : Universitas Negeri Yogyakarta

Nowadays, Non Destructive Tests have been applied in many qualityevaluations of existing concrete structures. One of the Non Destructive Tests (NDT)is based on Ultrasonic Pulse Velocity (UPV). The use of UPV method among othersare to estimate the strength of concrete, to detect the presence of crack, to measurethe homogeneity of concrete, the thickness of concrete slab, and also to estimate thediameter of the embedded steel reinforcement. The NDT technique will apply on thisresearch. This research used 24 cylinder test samples in four groups, which werereference cylinder (SR), cylinder-1 (S-01) with 0.5 kg/m3 of fibers, cylinder-2 (S-02)with 1.0 kg/m3 of fibers and cylinder-3 (S-03) with 1.5kg/m3 of fibers. Those cylinderswere of 150 mm in diameter and 300mm in height. The Ultrasonic Pulse Velocity(UPV) test was conducted with direct test method. The data are then analyzed usingstatistical program. The test result showed that the addition of polypropylene fibersoptimum and pulse velocity were of 1kg/m3 and 3,19km/s respectively. The increasepulse velocity transmitter higher on variation of fibers 1kg/m3 is 9,12% in comparisonto reference cylinder. The statistical test indicated that the signifinance value (2-tailed test) is homogeneity sample. This means that the ultrasonic pulse velocitymethod can used to knowing of homogeneity self compacting mortar using fibers.Keyword: Homogeneity, polypropylene, Ultrasonic pulse velocity Method

PENGARUH CARA PERAWATAN TERHADAP KUAT TEKAN DAN KUAT LENTUR HIGH EARLY STRENGTH FIBER REINFORCED CONCRETE Yogo Edi Prasetyo, Slamet Widodo
Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 11, No 1 (2015): Mei
Publisher : Universitas Negeri Yogyakarta

ABSTRACTThis research aims to compressive strength in fiber-reinforced concrete treatment withconventional treatment, the treatment compressive strength fiber-reinforced concrete curingcompound by treatment, Strong bending in the fiber-reinforced concrete maintenance treatmentat curing compound. Treatment of fiber-reinforced concrete accelerated hardening processusing two methods of treatment and care of concrete with concrete soaked with curringcompound. This research used 24 samples of the specimen cylinder with a diameter of 15 cmand 30 cm, to test a row of concrete at the age of 3 days, 7 days, 14 days and 28 days. Flexuralstrength testing 24 samples of concrete using beam specimen with a length of 53 cm, height 10cm width 10 cm, tests are carried out in succession at the age of 3 days, 7 days, 14 days and28 days. This study took this 3 sample test specimens for each type of testing at a certain age.The results showed that of the compressive strength in fiber-reinforced concrete treatment withconventional treatment at the age of 3 days: 35.36 N/mm2, 7 days: 41.87 N/mm2, 14 days: 43.32N/mm2, and 28 days: 48.66 N/mm2. Flexural strength on fiber-reinforced concretetreatment withconventional treatment in a row at the age of 3 days: 8:30 N/mm2, 7 days: 7:58 N/mm2, 14 days:8.66 N/mm2, and 28 days: 8.85 N/mm2. Compressive strength in steel with treatment of fibrousconcrete curing compound treatments successively at the age of 3 days: 27.34 N/mm2, 7 days:30.46 N/mm2, 14 days: 37.53 N/mm2, 28 days: 37.72 N/mm2. Flexural strength in the treatmentof fiber-reinforced concretecuring compound treatment at successively at the age of 3 days:7:45 N/mm2, 7 days: 6.75 N/mm2, 14 days: 7.86 N/mm2, 28 days: 8.98 N/mm2. Compressivestrength test with care soaked 21.25% higher than the curing compound, and flexural strengthtest with marinated treatments 7.25% higher than that of concrete curing compound withmarinated care is stronger than concrete curing compound treatment and how treatment mayaffect the resulting strength of the concrete.Keywords: Compressive strength, Curing compound, Flexural strength

ANALISIS TEGANGAN DAN MODIFIKASI METODE PENGUJIAN KUAT GESER ANTARA LAPIS BETON LAMA DENGAN BETON BARU Slamet Widodo
Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 13, No 2 (2017): Desember
Publisher : Universitas Negeri Yogyakarta

ABSTRACTThis paper presents the results of the stress distribution analysis on various methods of shear strength test to assess the interface strength between the old and new concrete layers. The shear strength test methods that studied were SHRP dual L-shape test, bi-surface shear test, modified guillotine test, modified FIP direct shear test, and push-out test. The stress distribution results were then used as the basis for the evaluation and modification of the test method of shear strength which is expected to be carried out more easily and gives accurate results. The proposed method is hereinafter referred to as a modified bi-surface shear test with 200x200x200 mm test dimension, 50 mm overlay thickness, using 3 (three) steel plate supports with 50 mm, 100 mm, and 50 mm supported, mounted symmetrical with reference to the position of the shear plane. This method was then applied for the test of 15 shear test variants with a total of 45 samples. Experimental test results show that the proposed method gives an acceptable result with coefficient of variations ranging from 1.322% to 3.054%.Keywords: stress distribution, old and new concrete interface, shear strength.ABSTRAKMakalah ini menyajikan hasil analisis distribusi tegangan pada berbagai metode pengujian kuat geser interface antara lapis beton lama dengan beton baru. Metode uji kuat geser yang dikaji adalah SHRP dual L-shape test, bi-surface shear test, modified guillotine test, modified FIP direct shear test, dan push-out test. Distribusi tegangan yang diperoleh selanjutnya digunakan sebagai dasar evaluasi dan modifikasi metode pengujian uji geser yang diharapkan dapat dilaksanakan dengan lebih mudah dan memberikan hasil yang akurat. Usulan metode yang dihasilkan selanjutnya disebut sebagai modified bi-surface shear test dengan dimensi benda uji 200x200x200 mm, tebal lapis overlay 50 mm, menggunakan 3 (tiga) tumpuan plat baja dengan lebar tumpuan 50 mm, 100 mm, dan 50 mm, yang dipasang simetris dengan acuan posisi bidang geser. Metode ini diterapkan pada pengujian 15 varian uji geser dengan total benda uji sebanyak 45 sampel. Hasil uji eksperimen menunjukkan bahwa metode yang diusulkan memberikan hasil yang cukup baik dengan nilai coefficient of variations berkisar antara 1,322% hingga 3,054%.Kata Kunci: distribusi tegangan, interface beton lama dan beton baru, kuat geser.

ANALISIS PENURUNAN KUALITAS MUTU KAYU PADA BANGUNAN CAGAR BUDAYA DENGAN METODE NON DESTRUCTIVE TEST (Studi Kasus Bangunan Cagar Budaya Masjid Gedhe Mataram Daerah Istimewa Yogyakarta) Darmono Darmono; Maris Setyo Nugroho; Slamet Widodo; Faqih Ma’arif
Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 16, No 2 (2020): Desember
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v16i2.36905

ABSTRAKPenelitian bertujuan untuk mengetahui mechanical properties material kayu Bangunan Cagar Budaya dengan non-destructive test. Penelitian ini menggunakan metode pengujian lansung dilapang menggunakan Ultrasonic Pulse Velocity (UPV). Terdapat dua variable yang digunakan yaitu kolom cacat dan kolom utuh untuk mengetahui perbedaan nilai cepat rambat gelombang. Jumlah sampel yang digunakan sebanyak enam buah dengan pengambilan data masing-masing sampel sebanyak lima kali. Hasil pengujian menunjukkan bahwa nilai kadar air dan berat jenis kayu sebesar 15,03% dan 0,62. Sedangkan hasil pengujian UPV pada kolom cacat dan utuh diperoleh cepat rambat gelombang sebesar 0,71 km/s dan 1,21 km/s. Berdasarkan hasil analisis menunjukkan bahwa nilai MOEd pada kolom utuh sebesar 9.374,37 MPa, sedangkan MOEd pada kolom cacat sebesar 3.240,62 MPa. Kata kunci: mechanical properties kayu, bangunan cagar budaya, ultrasonic pulse velocity ABSTRACTThis study aims to determine the mechanical properties of the wood material for the Cultural Heritage Building with a non-destructive test. This study used a direct field testing method using Ultrasonic Pulse Velocity (UPV). There are two variables used, namely the defective column and the solid column to determine the difference in the value of the fast propagation of the waves. The number of samples used was six with data collection for each sample five times. The test results showed that the moisture content and density of wood were 15.03% and 0.62. While the UPV test results on defective and solid columns obtained wave propagation velocity of 0.71 km / s and 1.21 km / s. Based on the analysis result, it shows that the MOEd value in the whole column is 9,374.37 MPa, while the MOEd in the defective column is 3,240.62 MPa. Keywords: mechanical properties of wood, cultural heritage buildings, ultrasonic pulse velocity

PEMANFAATAN LIMBAH ABUBATU SEBAGAIBAHAN PENGISI DALAM PRODUKSI SELF-COMPACTING CONCRETE Siamet Widodo, Agus Santosa, Pusoko Prapto
Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 2, No 2 (2006): September
Publisher : Universitas Negeri Yogyakarta

Abstractlimestone powder has been the traditional material used incontrolling the segregation potential and deformability of fresh selfcompacting concrete (SCC). This paper deals with the utilization ofalternative materials, such as quarry dust, for SCC applications. Thisexperimental tests aimed to observe the effects of stone dust role inSCC, that utilized by addition and partial replacement ranging from 0%.12,5%, 25% and 37,5% based on the weight of portland cernentmaterial. The tests were done on compressive strength and splittingtensile strength using three standard cylinder specimens for each data.Test results indicate that stone dust could improve the compressivestrength of see by addition method with the optimum dosage in 25°/~addition by weight of cement, but all test results indicate that stone dustwill decrease the splitting tensile strength of see both in addition andpartial replacement method.Keywords: self compacting concrete, filler, stone dust.compressive strength, splitting tensile strength.

PEMANFAATAN AIR LIMBAH PRODUKSI BETON READY-MIX SEBAGAI BAHAN CAMPURAN UNTUK PEMBUATAN BETON BARU Slamet Widodo
Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 6, No 1 (2010): Mei
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v6i1.10569

Production of large amounts of waste wash water coming from ready-mixedconcrete plants leads to problems of environmental impact. Well developed countries usually prohibit the disposal of such types of water, due to their extremely high pH value and suspended matter amount, and require the water to be treated prior to discharge. prEN 1008 and ASTM C94 provide for recycling waste water in the production of new concrete, but gives some restrictions for its composition and use. In this paper, the use of waste washes water (coming from a medium-size ready-mixed concrete plant) in mixing water for concrete has been investigated, especially the effects on some mechanical and physical properties. The waste wash water used as partial replacement (0%, 25%, 50%, 75%, and 100% by volume) of the total water content. The experimental tests conducted on the 7-day and 28-day of compressive strength, water absorption, and the coefficient of sorptivity. The results have shown that some variants of concrete prepared with recycled water exhibit better 28-day compressive strength compared to the reference materials. The use of wash water inconcrete leads to a reduction of the water absorption and concrete sorptivity, which surely improves the durability of the material. The optimal use of waste wash water is 25% by total volume of the water content. This effect can be ascribed to the filling action of the fines present in the wash water and to the slight reduction of the actual water/cement ratio.Keywords: Waste Wash Water, Compressive Strength, Water Absorption, Sorptivity

Co-Authors Agus Santoso Ahmed Wasiu Akande Alamsyah Prawiranegara Aniswara Dewi Bagas Habibilah Darmono Dewi Rachmi Doni Prakasa Eka Putra Faqih Ma arif Faqih Ma'arif Faqih Ma'arif Faqih Ma'arif Faqih Ma'arif Faqih Ma`arif Faqih Ma’arif Faqih Ma’arif Galeh Nur Indriatno Putra Pratama Hidayat Mahardika M Fajar Amir Maris Setyo Nugroho Maris Setyo Nugroho Maris Setyo Nugroho Maris Setyo Nugroho Maris Setyo Nugroho Maris Setyo Nugroho Maris Setyo Nugroho Mohamad Tafrikan Mohamad Tafrikan Novia Suryadwanti Nuryadin Eko Raharjo Qonaah Fajriani Rifki Alfirahma Rifki Alfirahman Sri Haryono Suryatama Ageng Pamuji Teuku Faisal Fathani Tiara Titania Wahyu Wilopo Wildan Setiawan Wisnu Rachmad Prihadi Zhengguo Gao Zhengguo Gao Zhengguo Gao

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