Nugraha, Yoga
Universitas Muhammadiyah Yogyakarta

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Pengaruh Variasi Bahan Tambah Abu Sekam Padi dan Zat Adiktif Bestmittel 0,5% Terhadap Kuat Tekan Beton Mutu Tinggi Nugraha, Yoga; Prayuda, Hakas; Saleh, Fadillawaty
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
Publisher : Semesta Teknika

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Abstract

Concrete is the mixture of portland cement or hidrolyc cement, fine aggregate, coarse aggregate and water with or without additional mixture to form solid mass. The use of cement makes the concrete price more expensive, so an innovation is needed which to be use natural additive, such as rice husk ash. This research was carried by decreasing the use of cement that was replaced by rice husk ash with the variation 5%, 10%, and 15%, and 0.5% additive material (bestmittel) of the cement. Cylinder samples with the diameter of 15 cm and heigth of 30 cm were tested at the age of 28 days. The result of this research shows that the compresssive strength of the concrete was affected by the additional of rice husk ash (RHA) and additive material (bestmittel), which decrease the compressive strength every additional rice husk ash. The use of rice husk ash and bestmittel on the concrete for 3 variation which were 5 % ; 10% ; and 15% with the additive (bestmittel) 0.5%  obtained compressive strength were 32,23MPa; 31,84MPa and 27,71MPa.
PENGARUH KEMANDIRIAN BELAJAR SISWA SMP TERHADAP KEMAMPUAN PENALARAN MATEMATIS Fajriyah, Lailatul; Nugraha, Yoga; Akbar, Padillah; Bernard, Martin
Journal on Education Vol 1 No 2 (2018): Journal On Education
Publisher : Departement of Mathematics Education

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Abstract

Research on the learning ability to understand student learning independence towards mathematical punishment abilities. The research method uses correlational methods with quantitative research. The population in this study were students of one of the junior high schools in the city of Bandung and the sample of this study were students of class IX F as many as 32 students. The material used is the material of Two Variable Linear Equation System (SPLDV) which has been taught in class VIII. The instrument in this study consisted of a mathematical punishment ability test of 5 items, then a non-test instrument in the form of an independent learning scale as many as 28 positive and negative revelations. The step that needs to be done in this study is the filling of the learning independence questionnaire, a mathematical punishment ability test. The results of this study concluded that positive learning independence on the ability of students to sentence 46.6% and 53.4% ​​by other factors related to student learning independence.