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ANALYSIS OF MIX DESIGN BETON HOW DOE (ENGLISH) AND ACI (AMERICA) Agus Santoso
Jurnal Penelitian Saintek Vol 7, No 1: April 2002
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This research was aimed to describe concrete mix design using British DOE and American AC/ methods viewedfrom concrete compressive strength and cost per-m', The mix design research used materials of sand and split from Krasak River, Nusantara brand Portland cement, and ground water from Faculty of Engineering UNY They were 10 samples each methods of (J 5 x15 x 15) em dimension. The data were collected by meant of experiment in the Laboratory of Building Materials, Faculty of Engineering, UNY, and analyzed descriptively. The results were that, to design concrete with K.225 characteristic, the DOE method required mix composition of PC : sand: split = I : 1,58: 3,49 with slump = 13 em, the average weight of concrete cubes = 8,066 kgs and characteristic of compressive strength = 263,1 kg/em". The ACI method required mix composition of PC: sand: split = I: 2,24: 3,12, with slump = tcm (slightly over the design value), the average weight of concrete cubes = 8,215 kgs, and characteristic of compressive strength = 284,73 kg/em', Based on the cost analysis, per-cube, the DOE method cost was Rp 215.906,- and the ACI method cost was Rp 195.791,-.. From the analysis, in general the AC/ method was more effective as well as efficient than DOE method.

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

PEMANFAATAN LIMBAH TETES TEBU SEBAGAI ALTERNATIF PENGGANTI SET-RETARDER DAN WATER REDUCER UNTUK BAHAN TAMBAH BETON Agus Santoso
Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 8, No 2 (2012): Desember
Publisher : Universitas Negeri Yogyakarta

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PENGARUH PUMICE BRECCIA SEBAGAI REPLACEMENT AGREGAT HALUS PADA MORTAR INSTANT TERHADAP KUAT TARIK BELAH MORTAR Khorunnisa, Agus Santoso
Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 11, No 1 (2015): Mei
Publisher : Universitas Negeri Yogyakarta

ABSTRACTThis research aims to know the capacity of split tensile strength of the mortar andlightweight mortar composition effective for wall with using pumice breccia. Pumice breccia is anaggregate that has a good thermal insulation and easy to obtain. In addition, pumice breccia islightweight aggregate that resistant to earthquakes. However, pumice stone has not been usedoptimally for structural elements. This research was conducted with the experimental method. Inthis study, there were 27 specimens that used for testing the split tensile strength of mortar.Each type of mortar mixture comprised of 3 compositions used were normal mortar 1PC: 4PS,1PC: 6PS, 1PC: 8PS ; normal mortar pumice 1PC: 2PS: 2PM, 1PC: 3PS: 3PM, 1PC: 4PS: 4PM; pumice mortar 1PC: 4PM, 1PC: 6PM, 1PC: 8PM. The proportion of the mixture obtained fromthe calculation of the volume of the test object is used. Each composition of the mixture wasmade 3 specimens with cylinders 150 mm x 300 mm. The results showed that the split tensilestrength avarage of normal mortar, normal mortar pumice, and pumice mortar were 0,16 MPa,0,10 MPa and 0,12 MPa. The analysis results show that the optimum split tensile strengthoccurs in normal mortar pumice. Therefore, the effective proportion mix of mortar with usingpumice breccia is 1PC: 3PS: 3PM.Keywords: Mortar, Pumice, Split Tensile Strength

EFEK PENAMBAHAN SERAT POLYPROPOYLENE TERHADAP DAYA LEKAT DAN KUAT LENTUR PADA REHABILITASI STRUKTUR BETON DENGAN SELF-COMPACTING REPAIR MORTAR (SCRM) Agus Santoso , Slamet Widodo
Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 6, No 2 (2010): Desember
Publisher : Universitas Negeri Yogyakarta

ABSTRACTIn the cases of repairing and rehabilitation work of existing concrete structures,interface bond strength between old (substrate layer), and new concrete (overlay) willbe one of the main factors that will significantly affect the quality of the strengthenedstructures. Considering its unique fresh characteristics, self-compacting concrete offersmore advantages in repairing and rehabilitation works. Effects of polypropylene fiberaddition on interface shear bond strength, and the flexural strength of bi-layer concrete(substrate and overlay) were investigated in this experimental study. In this researchworks, polypropylene fibers added at 0 kg/m3, 1 kg/m3, 2 kg/m3, and 3 kg/m3 in thefresh mix of self compacting concrete that will be used as the overlay layer. The freshcharacteristics of self-compacting concrete were investigated using slump-flow test.After 28 days of substrate layer (normal concrete) age, self-compacting concrete thatutilized as overlay layer were casted on the substrate layer. Interface bond strengththat tested using Bi-surface Direct Shear Method, and bi-layer (substrate and overlay)concrete flexural strength were investigated 28 days after the overlay layer casted.Each variant of the bond strength and flexural strength investigated using 3 standardspecimens, therefore totally 36 specimens were tested. Based on the tests results, itcan be concluded several point s as follows; (1) in the case of shear bond strength,polypropylene fiber addition lead the improvement of shear bond strength between newand old concrete. In the dosage of 0 kg/m3, 1 kg/m3, 2 kg/m3 and 3 kg/m3, the resultedshear bond strength were 1,985 MPa, 1,704 MPa, 2,519 Mpa, dan 2,489 MPa, (2)Polypropylene fiber addition also has positive effect on the flexural strength of thestrengthened concrete. Using 0 Kg/m3, 1 kg/m3, 2 kg/m3, and 3 kg/m3 ofpolypropylene fiber addition, the observed flexural strength were 4,156 MPa , 4,988MPa, 2,601 MPa, and 2,543 MPa, and (3) based on the tests results it can besuggested that 1 kg/m3 of polypropylene fiber addition is the optimum composition forthe use of polypropylene fiber reinforced self-compacting concrete as a overlay layerfor repairing, and rehabilitation of concrete structures.Keywords: Polypropylene fiber, Interface Bond Strength, Flexural Strength

PEMANFAATAN LIMBAH STYROFOAM (EXPANDED POLYSTERENE) UNTUK PEMBUATAN DINDING STRUKTURAL BETON RINGAN RAMAH LINGKUNGAN Agus Santoso, Slamet Widodo, Faqih Ma’arif.
Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 7, No 1 (2011): Mei
Publisher : Universitas Negeri Yogyakarta

This research study about usage of expanded polysterene for wall structure with strengthening of net wire. Styrofoam has very light weight unit which is about 13 kg/m3 up to 15 kg/m3. Lightweight concrete from expanded polysterene is an effort of utilising it as an alternative in the structure of lightweight walls. In this research, used 12 specimens of lightweight walls which were sandwich wall reference (DSK.H1-H6) has core dimension 80mm and sandwich wall polyprophyelene fiber (DS.I1-I6) with variation 0.5kg/m3; 1.0kg/m3, 1.5kg/m3 respectively. It has core 70mm, 80mm, 90mm in dimension. The dimension of lightweight wall were ±530, 400 and 120mm. Every variant consists of 2 wall, the type of load applied were compression, tensile and flexure. The data then analyzed with quantitative descriptive method. The test result showed that the average of compressive strength and tensile splitting test of self compacting mortar using fibres 0kg/m3, 0.5kg/m3, 1.0kg/m3, 1.5kg/m3 which were 12,45MPa, 10.38MPa, 12.24MPa, 9.49MPa and were 1.54MPa, 1.28MPa, 1.41MPa and 1.08MPa respectively. The addition of polypropylene fiberswere not influence compared with reference cylinder with 0kg/m3 fibers.The composition of the addition of polypropylene fiber will optimum of 1,0kg/m3 in volume. The core and plastering effective were the results 80mm and 20 mm, that the dimensions can increase the capacity of load 6.92%. The value of the maximum load capacity of walls on sandwich styrofoam is of 22.86kN on the addition of polypropylene fibers 1.0kg/m3 in volume.

Analisis Sifat Mekanik Tulangan Beton Pasca Bakar (Sebagai Bahan Pengayaan Mata Kuliah Bahan Bangunan dan Struktur Beton) Agus Santoso
Jurnal Pendidikan Teknologi dan Kejuruan Vol 18, No 1 (2009): (Mei)
Publisher : Faculty of Engineering, Universitas Negeri Yogyakarta

Penelitian ini bertujuan menganalisis besarnya tegangan leleh tulangan beton bertulang yang dibakar pada suhu 6000 Celcius dan 9000 Celcius dengan tebal lindungan beton 2 cm dan 4 cm. Diharapkan hasil penelitian ini dapat digunakan sebagai bahan pengayaan pada mata kuliah Bahan Bangunan dan Struktur Beton. Jenis penelitian ini adalah eksperimen dan pelaksanaannya dilakukan di Laboratorium Bahan Bangunan Fakultas Teknik UNY, Laboratorium Struktur dan Laboratorium Teknik Mesin Universitas Gajah Mada. Jumlah sampel sebanyak 15 buah. Bentuk konstruksi beton berupa balok, dengan ukuran 15 x 20 cm dengan panjang 45 cm. Tulangan yang digunakan adalah tulangan baja polos berdiameter 10 mm dan begel diameter 6 mm sebagai bahan untuk merangkai tulangan. Analisis data menggunakan deskriptif kuantitatif dengan mencari harga reratanya. Hasil penelitian yang diperoleh antara lain besarnya tegangan leleh tulangan sebelum dilakukan pembakaran= 385,12 MPa, setelah dibakar pada suhu 6000 Celcius dengan tebal lindungan beton 2 cm sebesar 385,25 MPa, sedangkan untuk tebal lindungan beton 4 cm sebesar 382,50 MPa. Besarnya tegangan leleh tulangan beton setelah dilakukan pembakaran pada suhu 9000 Celcius dengan tebal lindungan beton 2 cm sebesar 374,97 MPa, sedangkan untuk tebal lindungan beton 4 cm sebesar 377,48 MPa. Secara umum beton yang dibakar sampai dengan suhu sampai 9000 Celcius, tegangan lelehnya masih memenuhi persyaratan, yaitu masih dalam satu kelas (SII 0136-80)dan penurunan tegangan lelehnya sebesar 2,63%.

Analisis Degradasi Sifat Mekanik Beton yang Ditambah Superplasticizetdan Dibakar Di Atas Suhu 300 Derajat Celcius Agus Santoso
Inersia : Jurnal Teknik Sipil dan Arsitektur Vol 3, No 2 (2007): Agustus
Publisher : Universitas Negeri Yogyakarta

The aim ofthis research is to observe the transformation ofK225 concrete cube strengthafter combusted on temperatures of300, 600 and 900 degree ofCelcius. The test was conductedon the concrete age of35 days and the mix design was added by superplasticizer to slow downthe concrete formation. The additional superplasticizer will slow down the transformation ofCalciumhydroxide (Ca(OH)) into Calciumoxyde (CaD), so it will lessen the reduction ofconcretecube strength due to combustion.

Development of Plumbing Work Practice Learning Videos In the Department of Civil Engineering Education and Planning UNY Wisnu Rachmad Prihadi; Agus Santoso; Hasdi Nur Pratomo
Indonesian Journal Of Civil Engineering Education Vol 9, No 1 (2023): Indonesian Journal of Civil Engineering Education
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/ijcee.v9i1.73778

This research contributes to (1) developing a learning video of Plumbing and Sanitation Practice Practice, (2) knowing the feasibility of the Plumbing and Sanitation Practice Practice video learning media, (3) knowing user perceptions regarding the Plumbing and Sanitation Practice Practice learning video applied to the Department of Education UNY Civil Engineering and Planning. This research is an R&D research with a 4D model approach (Define, Design, Development, Disseminate). Data collection techniques are based on research subjects in making video products for Plumbing practice learning videos, namely experts related to plumbing materials, media experts. The instrument used uses a Likert scale to measure the feasibility level of the product being developed. The results obtained are (1) the define stage, namely analyzing the initial conditions, analyzing the character of students, analyzing concepts and learning objectives, the design stage, namely designing a script for the delivery of information consisting of opening, content, closing, the development stage, namely the process of recording making a video learning until the completion of editing the resulting video and then testing the eligibility validation of the product by experts, the disseminate stage, namely the limited dissemination of the product produced in this case the learning video of plumbing work practices to samples to assess and find out the level of feasibility and usefulness of the product; (2) the level of product feasibility based on the material content made is worth 4.58 belonging to the "very feasible" category, while the assessment based on the media made is worth 4.91 belonging to the "very feasible" category; (3) The results of the disseminate that has been carried out obtain the value of the user's perception of the product which is included in the very high category, the percentage of product feasibility is 91.52% which is included in the "Very Eligible" category.

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