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KUAT TEKAN BETON GEOPOLIMER MENGGUNAKAN ABU TERBANG I Made Alit Karyawan Salain; Made Ngakan Anom Wiryasa; I Nyoman Mahendra Martha Adi Pamungkas
JURNAL SPEKTRAN Vol 8 No 1 (2020): VOL. 8, NO. 1, JANUARI 2020
Publisher : Master of Civil Engineering Program Study, Faculty of Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (421.144 KB)

Semen merupakan bahan utama membuat beton, yang menghasilkan gas CO2 pada proses produksinya yang dapat mencemari lingkungan. Perlu dilakukan inovasi untuk membuat beton salah satunya beton geopolimer. Penelitian membuat beton geopolimer dengan bahan dasar abu terbang dan aktivator NaOH dan Na2SiO3. Gradasi butiran pasir dan koral dirancang, pada zona 2 dan gradasi koral dengan butiran maksimum 20 mm. persentase agregat dengan abu terbang dan aktivator sebesar 75% : 25%. Perbandingan pasir dan koral digunakan 1 : 1,24. Dibuat 3 campuran C1, C2, dan C3 dengan persentase abu terbang dan aktivator sebesar C1 70% : 30%, C2 65% : 35%, dan C3 60% : 40%. Perbandingan Na2SiO3 dan NaOH sebesar 1 : 1.5 dengan molaritas NaOH 14 M. Beton dicetak kubus 15 cm x 15 cm x 15 cm, kemudian dipanaskan pada suhu 70oC selama 24 jam. Pengujian kuat tekan beton dilakukan pada umur 7, 14, dan 28 hari masing masing menggunakan 3 benda uji. Penelitian bertujuan untuk mendapatkan campuran yang terbaik dan menghasilkan kuat tekan beton yang tertinggi. Pengurangan jumlah abu terbang dan penambahan aktivator meningkatkan nilai slump beton geopolimer, serta menurunkan kuat tekan beton geopolimer. Beton geopolimer mengalami peningkatan kuat tekan hingga 14 hari, hal ini terjadi pada beton C1, C2, dan C3. Pada umur 14 hari hingga 28 hari kuat tekan beton geopolimer tidak mengalami perkembagan, bahkan cenderung mengalami penurunan terutama pada beton C3. Campuran beton geopolimer yang terbaik terdapat pada beton C2, dengan kuat tekan sebesar 48,89 MPa pada umur 28 hari.

SIFAT MEKANIS BETON DENGAN SUBSTITUSI PARSIAL SERBUK BATU BATA PADA SEMENPORTLAND I Made Suparta; I Made Alit Karyawan Salain; Ngakan Made Anom Wiryasa
JURNAL SPEKTRAN Vol 6 No 1 (2018): Vol. 6, No. 1, Januari 2018
Publisher : Master of Civil Engineering Program Study, Faculty of Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (486.38 KB)

Waste bricks powder is pozzolan a material which contain silica and alumina activated that could react with the Portland cement (SPI). Compounds content SiO2 + Al2O3 + Fe2O3 bricks powders from Desa Oebelo of 91%. The pozzolan materials pass quality specifications according to ASTM C618 where the amount of compounds SiO2 + Al2O3 + Fe2O3 at least 70%. This research is to use of waste brick powder as a pozzolan material in concrete mixtures. Research on the mechanical properties of concrete with brick powder (SBB) as a partial substitution on the Portland cement (SPI) has been realized using cylindrical specimens of diameter = 150 mm and height = 300mm. The specimens were made by using a proportion, by weight, of 1.0 binder: 2.0 sand: 3.0 crushed stone and water binder ratio of 0.5. The binder was made by a mixture of SPI and SBB. The percentage of SBB in the binder varied: 0%, 10%, 20% and 30% by total weight of the binder. Thegrain distribution of sand and crushed stone were designed according to SNI 03-2834-2000 to meet respectively the gradation zone 2 for fine aggregate and the granules with a maximum diameter of 20 mm for coarse aggregate. The test of concrete mechanical properties included compressive strength, modulus of elasticity and split tensile strength and realized atthe specimen’s age of 28, 56, and 90 days respectively using three specimens for each test.The test result shows that the positive reaction of brick powderas a pozzolanic material can only be noted after the hydration age of 90 days. The development of compressive strength, modulus of elasticity and split tensile strength depend on the percentage of SBB used in the binder. In fact, the use of 10%SBB in the binder produce compressive strength, modulus of elasticity and split tensile strength respectively about 97%, 94%, and 98% compared to those produced using 100% SPI. This interesting performance could be strongly related to the pozzolanic effect of SBB on the long term of hydration. Keyword:brick powder, compressive strength, modulus of elasticity, split tensile strength

STUDI PERANCANGAN PRODUKSI PAPAN BUBUTMEN K Antriksa; I M. Alit K Salain; N. M. Anom Wiryasa
JURNAL SPEKTRAN Vol 4 No 1 (2016): Vol. 4, No. 1, Januari 2016
Publisher : Master of Civil Engineering Program Study, Faculty of Engineering, Udayana University

Abstract: Research on the design study of the "Bubutmen" board production (bamboo, coir fiber and cement), serves as a separator material in buildings. The objective of design includes architecture function and financial feasibility. Architecture functions include water absorption, shape, size, and weight of the "Bubutmen” board. Financial feasibility includes selling price, profit, production quantity at the breakeven point and the availability of raw materials. Availability of raw materials is calculated based on statistical data until 2016. Mechanical functions include the maximum load on the license "Bubutmen" board than Yumen board. The design aspects of water absorption and weight "Bubutmmen" board carried through hollow bamboo frame design and mix plastering with cement weight ratio, coir fiber and water is 5: 1: 3.167. The design aspects of the shape and size of the print is done through a planning tool. The design is done through the financial aspects of fuel efficiency and effectiveness of the production process.The design of the technical aspects of planning through the hollow bamboo frame, designed two variants namely "model 1" consists of 12 pieces of bamboo rods long, "Model 2" consists of 7 pieces of a long bamboo rods. The results of the design "Bubutmen" board "Model 1" acquired 24 585% water absorption and "Model 2" 15.135%. The form of a board with a length of 2400 mm, width 600 mm and 30 mm thick. Heavy "Bubutmen" board "Model 1" of 38.250 kg and "Model 2" amounting to 43.486 kg. Availability of raw materials until 2016 are eligible needs so worthy produced. The results of the financial feasibility "Model 1" full production system with a selling price of Rp 115,806.17 / unit, profit Rp 17,546.39 and the amount of production at the breakeven point 75 units. "Model 2" full production system with a selling price of Rp 113,486.14 / unit, profit Rp 17,194.87 and the amount of production at the breakeven point 76 units. "Model 1" production system of semi-finished materials with the selling price of Rp 113,628.17 / unit, profit Rp 17,216.39 and the amount of production at the breakeven point 76 units. "Model 2" production system of semi-finished materials and selling price Rp111.638,14 / unit, profit Rp 16914.87 and the amount of production at the breakeven point 77 production units. The results of the maximum load on the deflection permit Yumen board is 51.07 kg, "Model 1" 32.72 kg and "Model 2" 55.94 kg.

MANAJEMEN RISIKO PADA PELAKSANAAN PROYEK KONSTRUKSI GEDUNG PEMERINTAH DI KOTA DILI – TIMOR LESTE Octavio P.M Marques; I M. Alit K. Salain; I W. Yansen
JURNAL SPEKTRAN Vol. 2, No.2, Juli 2014
Publisher : Master of Civil Engineering Program Study, Faculty of Engineering, Udayana University

Building project as one of the construction services are filled with varying risks during the construction phase of the project implementation. At the stage of the project implementation, risks may arise either the risk of time, cost and those which affect the quality of the project. Therefore, we need to understand the risks at the construction phase and mitigation to the risks to meet in execution of project based on initial planning. The study was conducted to identify the risks in the implementation of construction projects of government buildings by using survey methods that aim to get the opinion of the respondents regarding the risks at implementation of the government building construction projects in the city of Dili - Timor Leste. Further, it was done a risk assessment to determine the major or main risks. Major risk is controlled through mitigation measures and allocation of risks to the parties directly involved in construction projects such as Project Owner, Technical Supervisor, Consultant Design, Consultant Supervision and Contractor. The analysis used in this study is a qualitative analysis. The results showed 64 risks identified in the implementation of construction projects there are 10 government buildings risks (16%) with an unacceptable category, 18 risks (28%) with the undesirable category, 28 risks (44%) with acceptable category and 8 risks (12%) with negligible category. Ownership of major / main risk to the parties directly involved in the implementation of construction projects such as the project owner, technical supervisor, consultant design, consultant supervision and contractors. The project Owner and Technical Supervision (Department of Public Works) is expected to further enhance the ability to manage projects so not throwing responsibility in managing government projects. consultant design and sonsultant supervision to be more careful in design till supervision during the implementation period so as to meet the cost, quality and time planned. Contractors are expected to further improve the performance of the building construction project.

PENGGUNAAN SERBUK BATU TABAS SEBAGAI PENGGANTI SEBAGIAN SEMEN DALAM PEMBUATAN BETON I W. Intara; I M. Alit K. Salain; N. M. Anom Wiryasa
JURNAL SPEKTRAN Vol 1, No 1, Januari 2013
Publisher : Master of Civil Engineering Program Study, Faculty of Engineering, Udayana University

Research on the use of stone dust (SDT) as a partial replacement of Ordinary Portland Cement (OPC) has been carried out by using cylindrical concrete specimens with Ø = 150 mm and h = 300 mm. Specimens were made by using the ratio, in weight, of cementitious material : sand : crushed stone of 1.00 : 1.93 : 2.67. The water cementitious material ratio is of 0.52. The cementitious material is a mixture of OPC and SDT. The percentage of OPC replacement by SDT varied from 0%-25%. The distribution of grains of sand and crushed stone are designed according to SNI 03-2384-2000: gradation zone 2 for fine aggregate and gradation with a maximum diameter of 20 mm for coarse aggregate. The tests of compressive strength, elastic modulus, tensile strength and permeability on the cylindrical specimens were realized at 28 and 56 days. The result indicates that SDT shows a good pozzolanic reactivity in terms of compressive strength, elastic modulus, tensile strength and permeability. Therefore, it can be used as a component of Portland Cement Composite. The development of compressive strength, elastic modulus, tensile strength and permeability of concrete produced with a mixture of OPC and SDT depends on the amount of SDT used in the mixture and hydration time. The pozzolanic effect of SDT can only be seen at the age of 56 days. The optimal use of SDT as a partial replacement of OPC in concrete applications varied from 5%-10%.

PENGGUNAAN TERAK NIKEL SEBAGAI AGREGAT DALAM CAMPURAN BETON Wayan Mustika; I M. Alit K. Salain; I K. Sudarsana
JURNAL SPEKTRAN Vol 4 No 2 (2016): Vol. 4, No. 2, Juli 2016
Publisher : Master of Civil Engineering Program Study, Faculty of Engineering, Udayana University

Nickel slag is one kind of nickel ore smelting waste after the combustion process. Production of nickel slag PT. Antam Pomalaa Kolaka Southeast Sulawesi province during the period 2011-2012 period approximately 1 million tons of slag / year, with a nickel content in ore processing of nickel is between 1.80% to 2.00%. Visually, the physical form of this nickel slag aggregate resembles. Research on the use of nickel slag as an aggregate in concrete mixture is carried out using a cylindrical specimen with a diameter of 15 cm and 30 cm high by 48 pieces were tested at 28 days with some variations in the mix. Variation 01, 100% natural aggregate, variation 02, nickel slag as coarse aggregate, variation 03, nickel slag as fine aggregate, and variation 04, nickel slag as coarse aggregate and fine aggregate. Aggregate gradation in the mixture is set and is designed so that it meets the specifications gradation mix for maximum aggregate size of 40 mm. The composition of the concrete mixture used is a mixture of concrete with the ratio of cement : fine aggegate : coarse aggregate is 1: 2: 3 in a weight ratio with cement water ratio (fas) is set at 0.5. The results showed that when compared with the use of natural agregate, terak nickel is used only as a coarse agregate, a fine agregate only and combined agregate coarse and fine agregates resulting slump values ??fell 39.47%, an increase of 55.26%, and an increase of 34.21%. As a coarse agregate, terak nickel increases the compressive strength, modulus of elasticity and splitting tensile strenght, respectively for 42.27%, 19.37% and 23.46%. As fine agregate, nickel terak resulting value of compressive strength, modulus of elasticity and tensile strength divided down respectively by 16.75%, 6.70% and 24.58%. As a combination of coarse and fine agregate, terak nickel increases the compressive strength, modulus of elasticity and splitting tensile strenght, respectively for 10.31%, 9.26% and 6.70%.

ANALISIS FAKTOR-FAKTOR YANG MEMPENGARUHI GAGAL LELANG PENGADAAN BARANG DAN JASA PEMERINTAH SECARA ELEKTRONIK ( E-PROCUREMENT ) DI KABUPATEN BADUNG I N. R. Karyasa; I M. Alit K. Salain; Mayun Nadiasa
JURNAL SPEKTRAN vol 2, No 1, Januari 2014
Publisher : Master of Civil Engineering Program Study, Faculty of Engineering, Udayana University

Starting in 2012 implementation of the procurement of goods / services in Badung regency have been conducted electronically (e-Procurement) by E-tendering procedure. But implementation in construction work package there were many failed auctions. This study aims to find out what factors that affect occurance of failed auction and what dominant factors influence it. The sample used in this study were 50 contractor company by using non-probability sampling with purposive sampling and data collection by using questionnaires. Data analysis was performed with factor analysis. The results shows there are 5 factors that have affect to the occurrence of failed auctions, the procurement with cumulative variance 84.327% that from 30 variable. The most dominant factors is I factor with eigenvalues 7.818 and variance 26.061% that formed by 8 variables. The eight variables compiler of I factor that are, not yet ready with the procurement of goods /service electronically, fail to upload offering documents, the lack of time availability to prepare offering documents, late to know auction announcement, personnel qualifications of project team do not match, ther is no / in-appropriate support from suppliers, incomplete offering documents and do not ready with evidence of qualifications.

Kekuatan dan Permeabilitas Beton Abu Terbang Volume Tinggi I Made Alit Karyawan Salain
Jurnal Teknik Sipil Vol 28 No 2 (2021): Jurnal Teknik Sipil
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2021.28.2.2

Abstrak Tulisan ini menyajikan hasil penelitian tentang properti dari beton abu terbang volume tinggi (ATVT) yang telah mengeras yang dibuat dengan mengganti sebagian semen Portland biasa (SPI) dengan abu terbang kelas C (ATC). Tujuan dari penelitian adalah untuk memeriksa perkembangan kekuatan dan permeabilitas beton ATVT terhadap waktu hidrasi. Tiga campuran beton ATVT, M1, M2, dan M3, dibuat dengan mengganti berturut-turut 40%, 50% dan 60% SPI dengan ATC, dalam perbandingan berat. Satu campuran kontrol, M0, dibuat dengan menggunakan 100% SPI. Proporsi campuran beton yaitu 1,0 perekat : 2,0 agregat halus : 3,0 agregat kasar dengan faktor air perekat sebesar 0,3. Pada setiap campuran ditambahkan 1,5% superplastisiser dari berat perekat. Uji yang dilaksanakan menyangkut kuat tekan, kuat tarik belah, dan permeabilitas pada umur 28, 56, dan 90 hari. Hasil uji menunjukkan bahwa kuat tekan, kuat tarik belah, dan impermeabilitas meningkat secara gradual dengan waktu hidrasi dan mampu mencapai yang dihasilkan oleh M0, terutama untuk campuran M1, setelah umur 90 hari. Mengacu pada hasil uji kuat tekan pada umur 28 hari, campuran beton ATVT tersebut dapat dipergunakan sebagai beton struktural. Kata-kata Kunci: Abu terbang kelas C, kuat tekan, kuat tarik belah, permeabilitas. Abstract This paper presents the result of research concerning the harden properties of high volume abu terbang (HVFA) concrete created by substituting ordinary Portland cement (OPC) with Class C fly ash (CFA). The goals of the research is to verify the strength and permeability evolution of the HVFA concrete with hydration time. Three HVFA concrete mixtures, M1, M2, and M3, were created by substituting OPC, by weight, with 40%, 50%, and 60% of CFA, successively. One control mixture, M0, was created by utilizing 100% OPC. The mix proportion of concrete was 1.0 binder : 2.0 fine aggregate : 3.0 coarse aggregate, and the water-binder ratio was 0.3. In each mixture, it was added 1.5% superplasticizer by binder weight. Tests conducted regarding compressive strength, splitting tensile strength and permeability at the age of 28, 56, and 90 days. The results show that the compressive strength, the splitting tensile strength and the impermeability of HVFA concrete improve gradually with hydration time and could reach those of M0, especially for M1 mixture, after 90 days of hydration. Based on the compressive strength test results at 28 days, the HVFA concrete mixtures could be used for structural concrete. Keywords: Class C fly ash, compressive strength, permeability, splitting tensile strength.

Study on Reactivity of Circulating Fluidized Bed Combustion Fly Ashes in the Presence of Water Salain I.M.A.K.
Civil Engineering Dimension Vol. 12 No. 1 (2010): MARCH 2010
Publisher : Institute of Research and Community Outreach - Petra Christian University

A study on reactivity of four different Circulating Fluidized Bed Combustion (CFBC) fly ashes has been realized in the presence of water. Paste of each ash was prepared and analyzed for its setting time, expansion and strength. The products of hydration, and their evolutions over a period of time were identified by X-ray diffraction and differential thermal analysis. The results of this study show that the reactivity of the CFBC fly ashes is strongly related to their chemical composition, essentially to their quantity of silica, alumina, lime and sulfate, which promote principally the formation of ettringite, gypsum and C-S-H. It is further noted that the intensity and the proportion of these phases determine the hydration behavior of the CFBC fly ashes.

KAJIAN AWAL PEMBUATAN BETON POROUS UNTUK PAVING BLOCK RAMAH LINGKUNGAN Yenni Ciawi; Made Alit Karyawan Salain; I Putu Adi Yana
EnviroScienteae Vol 18, No 3 (2022): ENVIROSCIENTEAE VOLUME 18 NOMOR 3, NOVEMBER 2022
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/es.v18i3.14789

In heavily populated urban areas, high rainfall can cause inundation and even flooding because the catchment area is decreasing. To reduce rainwater runoff and increase groundwater recharge, porous concrete can be used in housing area, in parking lots and roads with low traffic loads. Porous concrete is an environmentally friendly and sustainable building material. This study aims to examine the effect of aggregate composition on the porosity and tensile strength of porous concrete. The composition of the concrete mixture is determined based on the weight ratio between portland cement type I (PC) and coarse aggregate (AK), i.e. 1 PC : 3 AK, 1 PC : 4 AK, and 1 PC : 5 AK and the ratio of fine aggregate weight (AH) of 0 ; 0.5 ; 1, and the w/c is 0.5. For each variation, six 150 mm cubes were made. The parameters tested were slump, volume weight, porosity and compressive strength at day 28. The results show that the more coarse aggregate, the lower the volume weight and its compressive strength, and the higher the porosity and slump. Fine aggregate addition increases the compressive strength and volume weight and decrease slump value and porosity. The highest slump value (205 mm) and the smallest volume weight and compressive strength were obtained from concrete mixture with PC/AK=1/5 without AH content. The smallest slump (170 mm) and porosity values were obtained from concrete mixture with PC/AK=1:3 and AH/AK=1 and the largest volume weight and compressive strength. In this study, the slump value tends to be directly proportional to porosity and inversely proportional to volume weight and compressive strength. For further research, it is recommended that the w/c value be reduced to get a larger porosity value but without a significant decrease in compressive strength.

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