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All Journal Jurnal Sains dan Pendidikan Fisika Griya Journal of Mathematics Education and Application
Widya, Eka
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Education Mathematics Physics

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UJI FISIS PAVING BLOCK DENGAN PENAMBAHAN ABU CANGKANG KERANG KEPAH (POLYMESODA EROSA) Masthura, Masthura; Daulay, Abdul Halim; Widya, Eka
Jurnal Sains dan Pendidikan Fisika Vol 17, No 2 (2021): JURNAL SAINS DAN PENDIDIKAN FISIKA
Publisher : Universitas Negeri Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35580/jspf.v17i2.22205

Abstract

Abstrak: Uji Fisis Paving Block dengan Penambahan Abu Cangkang Kerang Kepah (Polymesoda erosa). Penelitian ini adalah penelitian ekperimental yang bertujuan untuk mengetahui pengaruh penambahan abu cangkang kerang kepah (Polymesoda erosa) terhadap sifat fisis paving block. Data yang diperoleh merupakan data hasil penelitian yang dilaksanakan pada bulan september–oktober 2020 di Laboratorium UINSU-Medan.  Sifat fisis yang diuji pada penelitian ini adalah densitas, daya serap air, dan porositas.  Penggunaan abu cangkang kerang kepah sebagai pengganti sebagian semen dalam pembuatan paving block  berpengaruh terhadap nilai densitas, daya serap air dan porositas. Pada setiap variasi campuran 5-15%  menghasilkan penurunan nilai densitas yaitu sebesar 1,81, 1,77,  dan 1,62 (g/cm3), mencapai nilai standar densitas beton ringan. Untuk nilai daya serap air pada setiap variasi campuran 0-15% mengalami peningkatan yaitu sebesar 5,88, 6,26, 7,37, dan 7,58%, telah memenuhi SNI 03-0691-1996. Kemudian untuk nilai porositas mengalami peningkatan pada variasi campuran 0-15% yaitu sebesar 9,95, 10,96, 13,41, dan 14,22%. 
Pengaruh Self-Confidence Terhadap Kemampuan Komunikasi Matematis Siswa Kelas VIII SMPN 5 Mataram Tahun Ajaran 2024/2025 Widya, Eka; Syahrul Azmi; Ni Made Intan Kertiyani
Griya Journal of Mathematics Education and Application Vol. 5 No. 3 (2025): September 2025
Publisher : Pendidikan Matematika FKIP Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/griya.v5i3.727

Abstract

Self-confidence is considered a key psychological factor in enhancing students' ability to communicate mathematical ideas effectively. However, few studies have explored this relationship in the context of lower secondary education. This study aims to investigate the effect of self-confidence on the mathematical communication skills of eighth-grade students at SMP Negeri 5 Mataram during the 2024/2025 academic year. A quantitative approach with an ex post facto design was employed. A purposive sample of 29 students was selected, and data were collected using a self-confidence questionnaire and a mathematical communication skills test on the topic of systems of linear equations in two variables. The data were analyzed using descriptive statistics and simple linear regression. With the regression equation, the correlation coefficient, and the coefficient of determination. The results indicate that self-confidence has a significant positive effect on students' mathematical communication skills. These findings underscore the importance of cultivating students' self-confidence to support their development of mathematical communication skills.
Co-Authors Abdul Halim Daulay Masthura, Masthura Ni Made Intan Kertiyani Syahrul Azmi