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Slamet Widodo
Universitas Negeri Yogyakarta
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Engineering Languange, Linguistic, Communication & Media Mechanical Engineering Social Sciences Transportation Other

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Journal : Civil Engineering Journal

 1 
Development of Eco-friendly Self-compacting Concrete Using Fly Ash and Waste Polyethylene Terephthalate Bottle Fiber Slamet Widodo; Rifki Alfirahma; Alamsyah Prawiranegara; M Fajar Amir; Aniswara Dewi
Civil Engineering Journal Vol 9, No 2 (2023): February
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2023-09-02-014

Abstract

This study aims to utilize fly ash and waste PET bottles for producing more sustainable self-compacting concrete (SCC) with better mechanical strength. Fly ash is utilized as a supplementary cement material and waste PET bottles as fiber reinforcement to improve its flexural strength and achieve the targeted compressive strength. The experimental works were conducted on eight variations using 80 specimens, divided into two main groups of partial cement replacement using 0% and 15% fly ash by weight. The two variants are added with PET fiber based on the volume fractions of 0%, 0.25%, 0.50%, and 0.75%. Fresh concrete was tested using the slump flow method (T50) and the Visual Stability Index (VSI) based on ASTM 1611. The hardened concrete tests are conducted after 56 days and include testing the concrete's compressive strength, flexural strength, and ultrasonic pulse velocity. Test results showed that the presence of PET fiber in the SCC mix decreased its flowability. However, when added up to 0.75%, the mixes still meet the flowability requirements of fresh-state SCC. PET fiber addition tends to reduce the compressive strength, whereas the reduction in compressive strength of SCC with PET fiber without fly ash is insignificant. However, in SCC that uses fly ash, the addition of PET fiber causes a significant decrease in its compressive strength. Adding PET fiber into SCC mixes can increase flexural strength, both for the two variants: SCC without fly ash and SCC with fly ash. It can be concluded that PET waste fiber with an aspect ratio of 40 can be added up to 0.5% for SCC without fly ash and up to 0.25% by volume fraction for SCC with fly ash addition. The ultrasonic pulse velocity test results have an excellent tendency to predict the concrete's compressive and flexural strengths. Therefore, the UPV test can be applied for the non-destructive test evaluation of PET fiber-reinforced SCC. Doi: 10.28991/CEJ-2023-09-02-014 Full Text: PDF
Effect of Steel Fiber on Plastic Hinge Length of Concrete Columns: Buckingham Theory Application . Tavio; Bambang Sabariman; Slamet Widodo
Civil Engineering Journal Vol 10, No 5 (2024): May
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2024-010-05-03

Abstract

The accuracy of designing the performance of concrete structures nowadays not only depends on the use of standard materials (cement, sand, and gravel) for certain concrete strengths but also on the accuracy of using additional materials for concrete, such as steel fiber. The use of steel fiber not only can improve the performance of concrete structures to behave in a ductile manner but can also form plastic hinges according to design purposes. The design of the axial load of Pa=0.121.Ag.f'c is based on the prediction of the column’s axial capacity. The columns were designed to behave in a flexural manner. As predicted, the lengths of the plastic hinges were found not too long. Controlling the length of plastic hinges in the design of structural concrete members is necessary to avoid excessive displacements. The control is mainly related to the prediction of the plastic hinge length. Thus, in this case, a plastic hinge length formula is required. In the study, the length of the plastic hinges of columns, which are confined with square stirrups and reinforced with steel fiber with Vf = 0%, 0.5%, 1%, 1.5%, and 2%, is proposed. This plastic hinge length formula is proposed after all column test specimens have met the displacement ductility requirement of mD>4, meaning that all test specimens are defined as very ductile. Doi: 10.28991/CEJ-2024-010-05-03 Full Text: PDF
Co-Authors . Tavio Agus Santoso Ahmed Wasiu Akande Alamsyah Prawiranegara Aniswara Dewi Bagas Habibilah Bambang Sabariman Batuna, Nerizza Cheryl Salma Darmono 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 Hendra Dewata Hidayat Mahardika M Fajar Amir Maris Setyo Nugroho Maris Setyo Nugroho Maris Setyo Nugroho Maris Setyo Nugroho Maris Setyo Nugroho Mohamad Tafrikan Mohamad Tafrikan Nugraheni, Risa Nuryadin Eko Raharjo Rifki Alfirahma Sri Haryono Suryatama Ageng Pamuji Suwartanti, Suwartanti Teuku Faisal Fathani Tiara Titania Wahyu Wilopo Wisnu Rachmad Prihadi Yuli Fajarwati Zhengguo Gao Zhengguo Gao Zhengguo Gao