GDL

The Effect of Polypropylene Fiber on Concrete

Skripsi, 014 / 2023 / TPPG
Undergraduate Theses from JBPTPPOLBAN / 2023-11-29 14:42:56
Oleh : 191144024 - Risma Herawati & 191144032 - Zalfa Nuur Jauza (risma.herawati.tppg19@polban.ac.id ; zalfa.nuur.tppg19@polban.ac.id)
Dibuat : 2023-11-29, dengan 4 file

Keyword : SCC, Serat Polypropylene, PFRSCC
Subjek : SCC, Polypropylene fibers, PFRSCC

Kombinasi antara SCC dengan kandungan serat PP dikenal dengan Polypropylene Fiber Reinforced Self Compacting Concrete (PFRSCC). Tujuan dari studi ini adalah melakukan pengujian pada campuran PFRSCC dan beton kontrol untuk mengetahui sifat mekanis beton PFRSCC, membandingkan hasil pengujian, dan mengaplikasikan hasil perancangan pada elemen struktur balok untuk mengetahui perilaku lentur. Pembuatan campuran PFRSCC menggunakan kadar serat PP sebesar 1% dari total volume beton. Komposisi campuran PFRSCC merujuk terhadap penelitian Hafizhul (2023). Hasil pengujian beton segar dengan flow table dicapai 250 mm dengan w/b 0,23. Nilai hasil pengujian sifat mekanis PFRSCC pada umur 28 hari menunjukan nilai kuat tekan sebesar 42,73 MPa; kuat tarik sebesar 4,33 MPa; kuat lentur sebesar 8,98 MPa; serta modulus elastisitas sebesar 45,51 GPa Sedangkan hasil pengujian sifat mekanik beton kontrol pada umur 28 hari menunjukan nilai kuat tekan sebesar 47,66 MPa; kuat tarik sebesar 1,95 MPa; kuat lentur sebesar 6,29 MPa; serta modulus elastisitas sebesar 38,79 Gpa. Apabila dibandingkan PFRSCC terhadap beton kontrol, maka serat PP memberikan pengaruh dalam meningkatkan kuat tarik sebesar 2,38 MPa (122%), kuat lentur sebesar 2,67 MPa (42,77%), dan modulus elastisitas beton sebesar 6,67 Gpa (17,12%). Namun, menurunkan nilai kuat tekan, sehingga lebih rendah 4,93 (11,54%) dibandingkan beton kontrol. Berdasarkan penelitian Hafizhul (2023), beton dengan serat PP memiliki nilai sifat mekanis lebih rendah dibandingkan serat baja. Hasil pengujian elemen balok PFRSCC dan beton kontrol dengan dimensi 100 x 150 x 1000 mm terhadap beban lentur menunjukkan hasil berbeda. Elemen balok PFRSCC memiliki beban maksimum 27,5 kN; kekakuan awal (first modulus, EIst) 5,32 kN/mm; kekakuan non-linier (second modulus, EInd) 2,21 kN/mm; daktilitas sebesar 5,6; dan ketegaran (toughness) sebesar 1606,08 kN.m. Sedangkan, balok beton kontrol memiliki beban maksimum 23,5 kN; kekakuan awal (first modulus, EIst) 9,93 kN/mm; kekakuan non-linier (second modulus, EInd) 4,32 kN/mm; daktilitas sebesar 4,92; dan ketegaran sebesar 750,83 kN.m. Oleh karena itu, elemen balok PFRSCC dengan kandungan serat PP sebanyak 1% mampu meningkatkan 17,02% terhadap beban maksimum; 14,75% terhadap daktilitas, dan 113,91% terhadap ketegaran. Namun, elemen balok beton kontrol memiliki kekakuan awal (first modulus, EIst) 86,79%, serta kekakuan non-linier (first modulus, EInd) 113,91% lebih besar atau dengan kata lain lebih kaku dibandingkan elemen balok PFRSCC. Kata kunci: SCC, Serat Polypropylene, PFRSCC.

Deskripsi Alternatif :

The combination of SCC with Polypropylene fibers known as Polypropylene Fiber-Reinforced Self-Compacting Concrete (PFRSCC). The purpose of this study is to tests PFRSCC mixtures and control concrete to find out the mechanical properties of PFRSCC concrete, comparing the results of mechanical property with control concrete, and applying the design results to beam structural elements to discover the flexural behavior. PFRSCC mixture using 1% Polypropylene fibers of the total volume of concrete. The composition of the PFRSCC mixture refers to Hafizhul’s (2023) research. The test results of fresh concrete with flow table achieved 250 mm with w/b 0.23. The test results of the mechanical properties of PFRSCC at the age of 28 days showed that a compressive strength of 42.73 MPa; tensile strength of 4.33 MPa; flexural strength of 8.98 MPa; and modulus of elasticity of 45.51 GPa. While, the test results of the mechanical properties of control concrete at the age of 28 days showed that a compressive strength of 47.66 MPa; tensile strength of 1.95 MPa; flexural strength of 6.29 MPa; and modulus of elasticity of 38.79 Gpa. When, comparing PFRSCC to control concrete, PP fibers have the effect to increasing the tensile strength by 2.38 MPa (122%); flexural strength by 2.67 MPa (42.77%); and modulus of elasticity by 6.67 GPa (17.12%). However, it decreased the compressive strength by 4.93 (11.54%) lower than the control concrete. Compared to Hafizhul’s (2023) research, concrete that contains PP fibers has a lower-mechanical properties than steel fibers. The test results of PFRSCC and control concrete beam elements with dimensions of 100 x 150 x 1000 mm under flexural load showed different results. The PFRSCC beam element has a maximum load of 27.5 kN; initial stiffness (first modulus, EIst) of 5.32 kN/mm; non-linear stiffness (second modulus, EInd) of 2.21 kN/mm; ductility of 5.6; and toughness of 1606.08 kN.m. Meanwhile, the control concrete beam had a maximum load of 23.5 kN; initial stiffness (first modulus, EIst) of 9.93 kN/mm; non-linear stiffness (second modulus, EInd) of 4.32 kN/mm; ductility of 4.92; and toughness of 750.83 kN.m. Therefore, the PFRSCC beam element with 1% PP fibers was able to increase 17.02% towards maximum load, 14.75% towards ductility, and 113.91% towards toughness. However, the control concrete beam element has 86.79% initial stiffness (first modulus, EIst), as well as 113.91% greater non-linear stiffness (first modulus, EInd) or in other words is stiffer than the PFRSCC beam element. Keywords: SCC, Polypropylene fibers, PFRSCC.

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