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All Journal Jurnal Pensil : Pendidikan Teknik Sipil Jurnal Pendidikan Teknik dan Vokasional
Aprilin, Ririt
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Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Engineering Environmental Science Mechanical Engineering Transportation Other

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THE UTILIZATION OF CONCRETE WASTE AS AN AGGREGATE SUBSTITUTE AND THE ADDITION OF DENIM FABRIC FIBERS ON COMPRESSIVE AND FLEXURAL STRENGTH OF CONCRETE : (AS AN IMPLEMENTATION OF CONCRETE TECHNOLOGY COURSE) Harahap, Farid Muhamad; Anisah, Anisah; Aprilin, Ririt
Jurnal Pensil : Pendidikan Teknik Sipil Vol. 14 No. 2 (2025): Jurnal Pensil : Pendidikan Teknik Sipil
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jpensil.v14i2.53724

Abstract

Concrete is one of the construction materials used in building structures, bridges, roads, and others. The material components that make up concrete consist of fine aggregates (sand), coarse aggregates (gravel), water, and cement. However, the drawbacks of concrete include low tensile strength, heavy weight, high sound reflection, and difficulty in reshaping after it has been formed. Adding fibers is one way to increase the flexural strength of concrete. This study aims to determine the utilization of concrete waste and the addition of denim fabric fibers in improving the compressive strength and flexural strength of concrete, using fiber lengths of 100 mm and widths of 5 mm with variations of fiber addition at 1% and 2%. The test results at 28 days show the compressive strength values of control concrete, concrete with 1% fiber proportion, and 2% fiber proportion are 10,27 MPa, 8,3 MPa, and 5,44 MPa, respectively, with the optimum compressive strength being 10,27 MPa for the control concrete. Therefore, none of the compressive strengths reached the design compressive strength of 40 MPa. The flexural strength values from the tests are 3,52 MPa, 4,32 MPa, and 2,98 MPa, with the optimum flexural strength being 4,32 MPa at the 1% fiber proportion. The flexural strength values range between 34,27% to 54,77% of the compressive strength values.
KAPASITAS PELAT LANTAI METODE HALF-SLAB DAN METODE KONVENSIONAL BERDASARKAN VARIASI KETEBALAN Tri Handayani; Aprilin, Ririt; Murtinugraha, R. Eka
Jurnal Pendidikan Teknik dan Vokasional Vol. 3 No. 1 (2020): Jurnal Pendidikan Teknik dan Vokasional
Publisher : LPPM, Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (326.148 KB) | DOI: 10.21009/JPTV.3.1.56

Abstract

Innovation in floor plate methods has been developing nowadays, one of the methods is the precast method. However, this method cannot behave monolithically with other structures so that the deflection does not meet the permit. To overcome this problem then the half-slab plate innovation comes with a combination of precast and conventional method for the topping. This study discusses the ratio of half-slab and conventional floor plate capacity based on the thickness variation. The capacity analysis covers the bending moment, shear force, deflection and stress due to gravity loads. The total thickness of plate was 120 mm and 130 mm, with the three thickness variations which were the precast is thicker than the topping, the topping is thicker than the precast, and the topping is equal to the precast. The results show that the half-slab plate capacity is 8 to 20 times larger than the conventional plate, due to the lifting and shoring forces. In addition, the variations in the topping and precast thickness affect the value of half-slab capacity, which is the thicker the precast the greater the capacity. Adding thickness every 5 mm could increase the moment capacity by 1,58-7,14%, the shear capacity by 1,61-7,14%, the deflection by 1,69-2,08% and could decrease the normal voltage by 1,76%. So the good variation in the half-slab plate thickness is the plate with the precast thickness which is smaller than the topping thickness. From the two types of plates, plates with a thickness of 130 mm have the capacity 4 to 8 times larger than 120 mm. This is influenced by the lift point placement, shoring plots and a larger 130 mm plate width. Keywords: floor plate capacity, half-slab, thickness variation
Co-Authors Anisah Harahap, Farid Muhamad Murtinugraha, R. Eka Tri Handayani