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All Journal Media Teknik Sipil Inersia : Jurnal Teknik Sipil dan Arsitektur Jurnal Teknik Sipil Semesta Teknika JURNAL SIPIL SAINS Prosiding Seminar Nasional Teknik Sipil UMS
Djoko Sulistyo
Fakultas Teknik Sipil dan Lingkungan - Universitas Gadjah Mada.
Civil Engineering, Building, Construction & Architecture Engineering Environmental Science Transportation

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Journal : Inersia : Jurnal Teknik Sipil dan Arsitektur

 1 
Mix Design of Ambient Cured Geopolymer Concrete with Fly Ash, GGBFS, and Borax Hanani, Eklisia; Satyarno, Iman; Sulistyo, Djoko
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 20 No. 2 (2024): December
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v20i2.74464

Abstract

Geopolymer cement, using fly ash (FA), presents a viable alternative to Portland cement. However, FA-based geopolymers often lack reactivity and strength, necessitating combination with calcium-rich materials like ground granulated blast furnace slag (GGBFS). However, GGBFS could accelerate setting and decrease workability, requiring a retarder. Borax is recognized for its retarding properties in FA-based geopolymers, but its impact in FA-GGBFS systems remains understudied. This study evaluated the influence of varying proportions of FA and GGBFS with the addition of borax, on the setting time, workability, and mechanical strength of the geopolymer paste, mortar, and concrete under ambient curing conditions. Setting time test was conducted for the geopolymer paste, flow table test for workability assessment of mortar, and compressive strength testing at 1, 7, and 28 days for the mechanical strength of paste and concrete. Various FA:GGBFS ratios (100:0, 70:30, 50:50, and 0:100) were examined. Alkali activator consists of NaOH and Na2SO3 with Na2SO3/NaOH ratio (R) of 1.5 and alkali to precursors ratio (A) of 0.45 was used. Borax was added at a constant 3% by weight of the precursors. Both the volume ratios of paste to fine aggregate voids (Rm) and mortar to coarse aggregate voids (Rb) were set to 1.5. Borax increased initial setting time by 7-33 minutes for FA-GGBFS geopolymer. GGBFS replacement decreased the workability of mortar, with flow index ranging from 83-158%. Increasing GGBFS content significantly improved compressive strength in both paste and concrete samples. Notably, 100% GGBFS replacement yielded the highest concrete strength at 74.86 MPa after 28 days. However, the optimal balance of properties was achieved with a 50% GGBFS replacement, resulting in satisfactory strengths of 100.29 MPa for paste and 69.08 MPa for concrete, along with a 40-minute initial setting time and a flow index of 138%. These findings surpass prior studies on similar geopolymers.
Demand Analysis of Material, Construction Equipment, and Labor on the Superstructure of Type I-Girder Bridge Tambunan, Reinhard; Aminullah, Akhmad; Sulistyo, Djoko
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 18 No. 2 (2022): December
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v18i2.53651

Abstract

Infrastructure development is one of the government's main national priority programs to support economic growth and community welfare. One of the issues encountered related to infrastructure development is that the supply chain capacity of material resources, construction equipment, and labor is not yet ideal. The purpose of this study is to analyze the demand for materials, construction equipment, and labor in the construction work of the superstructure of the bridge. This study used secondary data from some bridge construction work packages obtained from the Directorate General of Spatial Planning and Development, Ministry of Public Works. The research step consists of 7 stages. The total number of research samples is 33 consisting of 15 materials (xn), 15 construction equipment (yn), and 3 labor (zn). Of the five bridge construction work packages that meet the research requirements, the type of materials with the largest total demand is cement (x3) 4.904.156,13 kg and asphalt (x5) 578.620,64 kg. Meanwhile, the results of the construction equipment demand analysis show that the heavy equipment with the longest total operational time is dump trucks (y5) 9.395,61 hours and cranes (y12) 2.942,98 hours. From the analysis of demand labor, it is known that the total working time required is workers (z1) 251.753,97 hours, handyman (z2) 151.209,71 hours, and foreman (z3) 59.303,11 hours.  In addition, from the five construction work packages, the prestressed concrete I (PCI) girder with the longest size is 45 meters with 35 pieces, while the PCI girder with the shortest size is 20.6 meters with 14 pieces. In terms of needs, the highest number of PCI girders is 42 pieces, and PCI girders with a minimum number of 10 pieces.
Development of Cloud Point Data Processing Program for 3D BIM and 2D Cross Section Needs Mufid Kusuma, Muhammad Farhan; Aminullah, Akhmad; Sulistyo, Djoko
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 19 No. 1 (2023): May
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v19i1.54210

Abstract

The need for technological developments is needed to facilitate performance, accuracy, and effectiveness of work, especially in the field of civil engineering, is needed. With the emergence of innovative LiDAR (Light Detection and Ranging) technology scanners that are popularly used for 3D printing, developed into LiDAR Scanners for real field scanning. The result of using a LiDAR Scanner is in the form of point cloud data in a certain format, with a large enough memory. The purpose of this research is to use field point cloud data as 3D BIM data and then form a cross-section of the object. For this purpose, a special program is needed that functions to process cloud point data complexly, and is easy to use to change the shape of cloud point data to 3D data surface and 2D cross sections. The method used in this study is by creating a special program to process data point clouds using script code with the python language and several data point cloud processing libraries. In the program, 2 sub-menus will be created with certain functions: 1) Point Cloud (voxel downsampling, outlier reduction, normalize); 2) 3D model (ball pivoting/poisson surface, reduce vertex, slice mesh, transform mesh). In each data processing, the created program can only process on a specific file format; for point cloud processing in .xyz, .xyzn, .xyzrgb, .pts, .ply, .pcd formats; while for 3D data processing models are in .ply, .stl, .obj, .off , .gltf/glb format. The result of data processing using the created program can be a 3D surface with .ply /.obj format, and for cross-section generated 2D data with .jpg / .png format, and can be in the form of .dxf data for Autocad software. 3D surface data can be used as BIM data, while 2D cross-section data can be used as built 2D.
Co-Authors Aminullah, Akhmad Andreas Triwiyono Bambang Supriyadi Egatama, Henda Febrian Fathurrachman, Muhammad Puja Hanani, Eklisia Iman Satyarno Mufid Kusuma, Muhammad Farhan Muslikh ".", Muslikh Praganif Sukarno Randa, Sam Satyarna, Iman Syarif, Syafitri Tambunan, Reinhard Taufik, Panji Ginaya Wiku Adhiwicaksana Krasna Yanuar Haryanto