Ultra‐high performance concrete (UHPC) is increasingly used for various engineering applications, owing to its superior strength properties. Such properties, however, can be accompanied by workability issues, especially if the dosage of steel fibers is significantly increased. As a potential solution, this study explored the use of a combination of steel microfibers and macrofibers through a holistic experimental testing program. This was to understand the effects of steel fiber combinations on the workability and flexural strength of various UHPC mixtures. The microfibers were investigated for five different dosages from 1.0% to 3.0% (with an increment of 0.5%). In parallel, two mixtures were prepared with a 2.0% dosage of macrofibers in the form of twisted wire and hooked fibers. At the next stage, six additional mixtures were prepared with a combination of microfibers and macrofibers of various dosages. Further to the measurements extracted from the workability and flexural strength tests, digital image correlation (DIC) analyses were employed to obtain firsthand information about the widths and depths of cracks observed in the flexural specimens tested under an increasing load. The outcome of this study showed how a combination of microfibers and macrofibers can contribute to improving the flexural response characteristics of UHPC, especially without having to increase the dosage of steel fibers to the ranges that can adversely affect the mixture's workability.
Rumusan Masalah dalam penelitian ini adalah Apakah terdapat hubungan antara gaya belajar dengan prestasi belajar matematika siswa kelas VIII MTs Negeri 1 Baubau? Tujuan dari penelitian ini adalah untuk mengetahui hubungan antara gaya belajar dengan prestasi belajar matematika siswa kelas VIII MTs Negeri 1 Baubau. Penelitian ini menggunakan penelitian ex post facto dengan metode kuantitatif. Populasi dalam penelitian ini adalah semua murid kelas VIII MTs Negeri 1 Baubau Tahun Ajaran 2021/2022 yang terdiri dari 7 rombongan kelas belajar yaitu 239 siswa. Teknik pengambilan sampel menggunakan teknik random sampling, diambil minimal 36% dari seluruh populasi dan diambil sampel sebanyak 86 siswa. Pengumpulan data dalam penelitian ini yaitu berupa angket gaya belajar dan prestasi belajar matematika siswa yang diperoleh dari nilai rapor siswa kelas VIII MTs Negeri 1 Baubau semester genap tahun ajaran 2021/2022. Teknik analisis data dalam penelitian ini menggunakan statistic deskriptif dan statistic inferensial. Analisis yang digunakan untuk menguji hipotesis adalah regresi sderhana dan analisis korelasi. Berdasarkan hasil analisis dengan menggunakan regresi sederhana diperoleh persamaan regresi linear: Y = 61,937 + 0,237X, dengan nilai t sebesar 3,732, signifikan pada 0,000 <0,05. Hal ini menunjukkan bahwa diterima atau ditolak yang berarti bahwa terdapat hubungan positif antara gaya belajar dan prestasi belajar matematika kelas VIII MTs Negeri 1 Baubau.
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