Studi Eksperimental dan Numerikal Tegangan-Regangan Beton Geopolimer Berbasis Fly Ash Tipe C Terkekang Penampang Lingkaran

Ummah, Galih Syifa'ul (2024) Studi Eksperimental dan Numerikal Tegangan-Regangan Beton Geopolimer Berbasis Fly Ash Tipe C Terkekang Penampang Lingkaran. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Semen geopolimer berbasis fly ash akhir-akhir ini mendapat perhatian karena potensi aplikasinya, serta menjadi bahan pengikat alternatif dengan emisi rendah dibandingkan dengan semen portland konvensional dalam produksi beton. Pengembangan beton geopolimer bertulang merupakan salah satu langkah awal untuk memperluas penggunaannya sebagai material konstruksi. Salah satu karakteristik beton bertulang yang penting dalam bangunan adalah daktilitas. Kajian yang dilakukan terhadap sifat mekanis dan perilaku daktilitas elemen struktur beton geopolimer berbasis fly ash tipe C sangat penting untuk mengembangkan penerapan beton geopolimer. Penelitian ini bertujuan untuk mengetahui sifat mekanis, pengaruh kekangan terhadap peningkatan kekuatan, dan rasio daktilitas regangan beton geopolimer berbasis fly ash tipe C. Beton berbasis semen OPC juga dibuat sebagai pembanding. Variabel yang dipertimbangkan dalam penelitian ini adalah jarak sengkang. Pengaruh jarak antar sengkang terhadap peningkatan kekuatan dan rasio daktilitas regangan beton geopolimer berbasis fly ash tipe C dipelajari. Pemodelan analitik menggunakan model Richard et al., model Mander et al., dan model Samani & Attard, sedangkan pemodelan numerik menggunakan program bantu 3DNLFEA yang selanjutnya dibandingkan dengan hasil eksperimen. Sifat mekanis sebagai input pada pemodelan adalah kuat tekan, modulus elastisitas, rasio Poisson, kuat tarik belah, dan fracture energy. Hasil menunjukkan bahwa peningkatan rasio volumetrik sengkang meningkatkan kekuatan dan rasio daktilitas beton geopolimer. Pemodelan analitik menggunakan model Samani & Attard yang dimodifikasi menunjukkan prediksi tegangan dan regangan puncak, tegangan dan regangan pada titik infleksi yang lebih baik untuk beton geopolimer berbasis fly ash tipe C terkekang. Selain itu, model Richard et al. dapat memprediksi tegangan dan regangan puncak beton OPC terkekang yang lebih baik pada penelitian ini. Analisis numerik menggunakan program bantu 3DNLFEA menunjukkan kurva tegangan-regangan beton geopolimer berbasis fly ash tipe C diprediksi sesuai hasil eksperimen.
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Fly ash-based geopolymer cement has recently attracted the attention due to its application potential, as well as being an alternative binder with low emissions compared to conventional portland cement in concrete production. The development of reinforced geopolymer concrete is one of the initial steps to expand its use as a construction material. One of the important characteristics of reinforced concrete in buildings is ductility. The study conducted on the mechanical properties and ductility behavior of class C fly ash-based geopolymer concrete structural elements is very important for developing the application of geopolymer concrete. This study aims to determine the mechanical properties, the effect of restraint on increasing strength, and the strain ductility ratio of class C fly ash-based geopolymer concrete. OPC cement-based concrete was made as a comparison. The variable considered in this study is the pitch of confinement. The effect of the pitch of the confinement on increasing strength and strain ductility ratio of class C fly ash-based geopolymer concrete was studied. Analytical modeling using the Richard et al. model, the Mander et al. model, and the Samani & Attard model, and numerical modeling using the 3DNLFEA program are compared with the experimental results. Mechanical properties as modeling input are compressive strength, elastic modulus, Poisson's ratio, splitting tensile strength, and fracture energy. The results showed that increasing the volumetric confiement ratio increases the strength and ductility ratio of geopolymer concrete. Analytical modeling using the modified Samani & Attard model showed better prediction of peak stress and strain, stress and strain at the inflection point for confined class C fly ash-based geopolymer concrete. In addition, the Richard et al. model predicted the peak stress and strain of confined OPC concrete better in this study. Numerical analysis using the 3DNLFEA program showed that the stress-strain curve of class C fly ash-based geopolymer concrete was predicted in good agreement with experimental results.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	geopolymer concrete, class C fly ash, confinement, strength enhancement, stress-strain, beton geopolimer, fly ash tipe C, kekangan, peningkatan kekuatan, tegangan-regangan
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA418.16 Materials--Testing. T Technology > TA Engineering (General). Civil engineering (General) > TA433 Strength of materials. T Technology > TA Engineering (General). Civil engineering (General) > TA444 Reinforced concrete T Technology > TA Engineering (General). Civil engineering (General) > TA660.C6 Columns
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	Galih Syifa'ul Ummah
Date Deposited:	08 Aug 2024 01:37
Last Modified:	08 Aug 2024 01:37
URI:	http://repository.its.ac.id/id/eprint/114470

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