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All Journal Sumatra Journal of Disaster, Geography and Geography Education JURNAL SAINTIS Journal of Science and Technology
Zulhendri Zulhendri
Jurusan Teknik Mesin Politeknik Negeri Padang
Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Engineering Environmental Science Mathematics

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Kajian Perbandingan Penggunaan Berbagai Merek Semen Dengan Dan Tanpa Perawatan Terhadap Kuat Tekan Dan Kuat Lentur Beton Pada Perkerasan Kaku Wiyono, Sugeng; Zulhendri, Zulhendri; Alfajrizal, Mohd.; Puri, Anas
JURNAL SAINTIS Vol 18 No 2 (2018)
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/saintis.2018.vol18(2).3148

Abstract

[ID] Semen merupakan suatu bahan pembentuk beton yang berperan sangat penting untuk mencapai mutu yang direncanakan. Selain pemilihan jenis merek semen, salah satu cara untuk mendapatkan kualitas beton yang baik yaitu dengan cara melakukan perawatan. penelitian ini bertujuan untuk mengetahui sejauh mana kualitas tiga merek semen terhadap kuat tekan dan kuat lentur beton disamping itu juga bertujuan untuk mengetahui seberapa besar perbedaan kekuatan dari masing- masing merek semen terhadap beton yang dirawat dan tanpa dirawat. Pada penelitian ini menggunakan metode eksperimental yang sesuai dengan SK SNI T-15-1990-03. Penelitian ini menggunakan semen  Padang, semen Holcim, dan semen Bosowa, dengan menggunakan jenis perawatan perendaman pada sampel beton, pengujian yang dilakukan adalah pengujian kuat tekan dan kuat lentur dengan mutu rencana fc 30 MPa dengan umur 7, 14, 28, dan 56 hari, untuk masing-masing umur dibuat 3 benda uji dirawat dan 3 benda uji tidak dirawat. Dari hasil uji kuat tekan rata-rata semen padang memiliki kekuatan 32,65 MPa, semen holcim 31,33 MPa dan semen bosowa  30,86 MPa. Sedangkan untuk pengujian kuat lentur semen padang 4,35 MPa, semen holcim 4,23 MPa dan semen bosowa 4,18MPa, sementara beton yang tidak dirawat memiliki nilai lebih rendah dari beton yang dirawat.. Dari hasil pengujian tersebut dapat dilihat bahwa pemakaian merek semen perlu diperhatikan karakteristiknya serta perawatan mempunyai konstribusi yang cukup besar dalam mendapatkan mutu beton hasil pelaksanaan. [EN] The cement concrete as product that consit of several element which is important for achieve the quality that be planed. To choose same kriteria for getting the good quality of concrete, one of way are choosing the brand of cement and doing curing. Therfore, the aim of this research is ro know about the strength of of each brand of cement toword cured and uncuret concrete. This research used cement padang, cement holcim, cement bosowa with soaking treatments of concrete samples. The used of the tests are compresive and bending strength of concrete with using quality plan fc’ 30 MPa and age range 7, 14, 28 and 56 days. The cement padang is better than others cement and by getting the the highest value also found cement Padang has the sensitivity to the curing. Cement Bosowa got high strength at the beginning of the age and for cement Holcim is relativity stable with the age. From the researh, knowed that is important the selection of cement brand and curing to get the good result consist of the quality by yhe first plan.
Assembling Discovery Learning Model of Learning to Increase Activity and Results of Learning Geography in Class X Mipa 1 SMAN 3 Padang Panjang Zulhendri, Zulhendri; Anwar, Syafri
Sumatra Journal of Disaster, Geography and Geography Education Vol 4 No 1 (2020): Sumatra Journal of Disaster, Geography and Geography Education (SJDGGE)
Publisher : Sumatra Journal of Disaster, Geography and Geography Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (111.01 KB) | DOI: 10.24036/sjdgge.v4i1.323

Abstract

Discovery method is a component of educational practices that include teaching methods that promote active learning, the orientation in process, directing his own, find your own and reflective, Use of discovery learning, wants to change the conditions of passive learning to active and creative, learning teacher oriented to student oriented, and change the ekspository mode students only receive information from the student's teacher Discovery mode to find information themselves. The learning result is the ability of the students after receiving a learning experience. With action research methods class through two cycles of data obtained an increase in the results of class X MIPA 1 SMAN 3 Padang Panjang, amounting to 29 students from the mean value approximately 52% of students scoring above the clasical minimal value, and 48% of students are below the clasical minimal value, bethe average value approximately 86% of students scoring above the clasical minimal value, and 14% of students are below the clasical minimal value, learning discovery in learning geography will increase the activity of students in learning, both of individually and classical. Increased activity of students in learning makes students more enthusiastic about learning and will improve student learning outcomes.
Efektivitas Penggunaan Teknologi Informasi dalam Pembelajaran Daring pada Masa Covid-19 Zulhendri, Zulhendri; Yunita, Rika Gusri; Hayeni, Fitri
JOSTECH: Journal of Science and Technology Vol 1, No 1: Maret 2021
Publisher : UIN Imam Bonjol Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (301.57 KB) | DOI: 10.15548/jostech.v1i1.2429

Abstract

This study aims to find out how to describe the effectiveness of the use of information technology in online learning during the Covid-19 period at SDN 04 Koto Tuo Sulit Air. This research is descriptive quantitative research. The population in this study were all students of SDN 04 Kototuo Sulit Air in the 2020/2021 school year. The data was collected by distributing questionnaires online to 57 students who became respondents consisting of 18 grade IV students, 19 class V students and 20 grade VI students. The results illustrate that 1) As many as 89.47% of students stated that the use of information technology was effective in online learning, while 10.52% of students stated that the use of information technology was not effective in online learning, 2) Students stated that the most effective platform in learning online is WhatsApp at 50.88%, 3) Students state that the least effective platform in online learning is the zoom meeting of 47.37%
Co-Authors Alfajrizal, Mohd. Anas Puri, Anas Astuti - Firdayani, Firdayani Hasan Zaini Hayeni, Fitri Imamora, Marjoni Rusdial Marta Sugeng Wiyono Syafri Anwar, Syafri Yunita, Rika Gusri