Eksperimental dan Numerikal Bond Strength Beton Geopolimer Berbasis Fly Ash Tipe C dengan Metode Pencampuran Kering

Ashara, Khansa Fadilah (2023) Eksperimental dan Numerikal Bond Strength Beton Geopolimer Berbasis Fly Ash Tipe C dengan Metode Pencampuran Kering. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Beton geopolimer merupakan material alternatif ramah lingkungan menggunakan sumber bahan silika dan alumina dengan aktivator basa. Sudah banyak penelitian yang menjelaskan tentang performa beton geopolimer, terutama pencampuran sistem basah.
Namun, pencampuran sistem basah masih memiliki kelemahan diantaranya aplikasi yang kurang praktis, setting time yang sangat cepat dan workability yang rendah. Kelemahan tersebut diatasi dengan menggunakan metode pencampuran yang berbeda disebut sistem kering. Performa geopolimer sistem kering seperti kuat tekan, kuat lentur, shrinkage sudah diteliti oleh peneliti sebelumnya namun belum ada penelitian mengenai bond strength. Bond strength sangat penting diperlukan untuk mengetahui ikatan antara beton dan tulangan.
Studi ini menggunakan pengujian pull out. Campuran material beton yang digunakan adalah fly ash tipe c, alkali aktivator yaitu NaOH12M dan Na2SiO3.5H2O dengan perbandingan 1:1, air, agregat halus, agregat kasar dan superplasticizer 2%. Pengujian pull�out pada penelitian ini dibagi menjadi 3 tahap. Benda uji pada tahap pertama, kedua dan ketiga berturut turut adalah prisma berukuran 150 x 150 x 200 mm, 150 x 150 x 150 mm dan 150 x 150 x (60+ 2 kali diameter) mm, variasi 3 macam diameter tulangan (D10, D12, D16) dengan tambahan tulangan transversal sengkang ukuran Ø6-50. Panjang tulangan tertanam sepanjang 140 mm.
Hasil pengujian pull out pada penelitian ini dibagi menjadi 3 tahap. Tahap pertama, tulangan pada benda uji rencana mengalami putus sebelum terjadinya slip. Begitu pula
setelah proses pemotongan benda uji pada tahap kedua menjadi 150 x 150x 150 mm. Hasil bond stress baru dapat terlihat pada pengujian dengan panjang ld sebesar 2 kali diameter (db). Nilai rata- rata bond stress berturut turut untuk D10, D12 dan D16 adalah 24,25 MPa; 25,36 MPa dan 25.8 MPa. Semakin besar dimeter tulangan, nilai bond stess juga semakin meningkat. Perbedaan nilai bond stress rata- rata saat penambahan tulangan transversal adalah sebesar 23% untuk diameter 16, 23% (D12) dan 13% (D10). Berdasarkan pemodelan spesimen secara Finite Element Method (FEM) dengan menggunakan 3D-NLFEA menghasilkan nilai puncak bond stress memliki nilai yang mendekati eksperimen, dengan perbedaan 0.1 - 6%.
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Geopolymer concrete is an environmentally friendly alternative material using silica
and alumina as source materials with alkaline activators. There have been many studies
describing the performance of geopolymer concrete, especially wet mixing. However, wet
system mixing still has disadvantages including less practical application, fast setting time
and low workability. These weaknesses are overcome by using a different mixing method
called a dry system. The performance of dry system geopolymers such as compressive
strength, flexural strength, shrinkage has been studied by previous researchers but there is no
research on bond strength. Bond strength is very important to know the bond between
concrete and reinforcement.
This study uses pull out testing. The concrete materials used were fly ash type c, alkali
activators namely NaOH12M and Na2SiO3.5H2O in a ratio of 1:1, water, fine aggregate,
coarse aggregate and 2% superplasticizer. Pull-out testing in this study was divided into 3
stages. The test specimens in the first, second and third stages were respectively 150 x 150 x
200 mm, 150 x 150 x 150 mm and 150 x 150 x (60+ 2 times diameter) mm prisms, variations
of 3 kinds of reinforcement diameters (D10, D12, D16) with additional transverse
reinforcement Ø6-50. The length of the embedded reinforcement is 140 mm.
The pull-out test results in this study are divided into 3 stages. In the first stage, the
reinforcement test specimen broke before the slip occurred. Similarly, after the process of
cutting the test specimen in the second stage to 150 x 150x 150 mm. Bond stress results can
be seen in tests with a length of ld equal to 2 times the diameter (db). The average bond stress
values for D10, D12 and D16 are 24.25 MPa; 25.36 MPa and 25.8 MPa, respectively. The
larger the reinforcement diameter, the higher the bond stress value. The difference in average
bond stress values when adding transverse reinforcement is 23% for diameter 16, 23% (D12)
and 13% (D10). Based on the Finite Element Method (FEM) modeling of the specimens
using 3D-NLFEA, the peak bond stress values are close to the experimental values, with a
difference of 0.1 - 6%.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	pull out, geopolimer, sistem pencampuran kering, fly ash tipe C, finite element method, pull-out, geopolymer, dry mixing, fly ash type C, finite element method
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA439 Lightweight concrete. High strength concrete. T Technology > TA Engineering (General). Civil engineering (General) > TA444 Reinforced concrete T Technology > TA Engineering (General). Civil engineering (General) > TA658 Structural design
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	Khansa Fadilah Ashara
Date Deposited:	03 Aug 2023 05:15
Last Modified:	03 Aug 2023 05:15
URI:	http://repository.its.ac.id/id/eprint/102857

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