<p>Abstrak : Tujuan penelitian ini adalah (1) mengetahui pengaruh penggantian<br />agregat kasar beton dengan terak baja pada variasi 0%, 20%, 40%, 60%, 80%, dan<br />100% pada umur 14 hari, 28 hari, 60 hari, dan 90 hari terhadap kuat tekan beton<br />dengan metode campuran 1:2:3, (2) mengetahui beton dengan variasi penggantian<br />terak baja 0%, 20%, 40%, 60%, 80%, dan 100% dengan umur 14 hari, 28 hari, 60<br />hari, dan 90 hari berdasarkan berat isinya masih termasuk katagori beton normal,<br />dan (3) mengetahui persentase terak baja yang digunakan sebagai pengganti agregat<br />kasar mencapai kuat tekan optimal pada beton umur 14 hari, 28 hari, 60 hari, dan<br />90 hari dengan metode campuran 1:2:3. Penelitian menggunakan metode<br />eksperimen, dengan sampel beton berbentuk silinder dimensi 150 mm x 300 mm<br />terhadap pengujian kuat tekan. Variabel bebas penelitian ini berupa penggantian<br />sebagian agregat kasar dengan terak baja dengan metode campuran perbandingan<br />1:2:3. Adapun persentase penggantian yang digunakan adalah 0%, 20%, 40%,<br />60%, 80%, dan 100% dari volume agregat kasar, sedangkan variasi umur pengujian<br />benda uji adalah 14 hari, 28 hari, 60 hari, dan 90 hari dengan 3 buah sampel setiap<br />variasi penggantian. Pengujian kuat tekan dilakukan dengan CTM (Compressing<br />Testing Machine) menurut SNI 1974-2011. Hasil penelitian sebagai berikut (1)<br />Penggantian terak dan variasi umur berpengaruh terhadap kuat tekan beton terak<br />baja, (2) Berat isi beton normal (2200-2500 kg/m3) dicapai pada variasi 20%, 40%,<br />dan 60% sedangkan pada variasi 80% dan 100% tidak termasuk dalam katagori<br />beton normal (>2500 kg/m3), (3) Penggantian terak baja dan variasi umur<br />menghasilkan kuat tekan optimal beton terak pada persentase 60% yaitu 11,78 MPa<br />pada umur 14 hari, 14,05 MPa pada umur 28 hari, 18,29 MPa pada umur 60 hari,<br />dan 20,36 MPa pada umur 90 hari.<br />Kata Kunci: terak baja, agregat kasar, umur beton, kuat tekan, beton terak</p>
This study aimed to identify students' learning needs related to integrating mobile device technology and creative thinking skills in learning land surveying. This was done by looking at students’ responses based on media use, opportunities for media development, and supporting facilities for developing learning media. The participants of this study were 155 second-year students of the building engineering study program at Vocational High Schools. Mobile learning needs analysis indicators were prepared as a questionnaire instrument to achieve research objectives. This study used a quantitative approach, and the results of student responses were analyzed descriptively and presented in percentages. The findings revealed that 59.7% of respondents "agreed" and 40.3% "strongly agreed" to support the development of learning media that integrated cellular technology and creative thinking into the learning process of land surveying and was supported by the availability of learning support facilities. The conclusion is that the use of cellular technology in the learning process is directly proportional to students' abilities in operating and owning a smartphone, and that in the development of mobile learning as an alternative learning medium for land surveying has enormous opportunities. This study recommends the product of learning media using mobile learning methods and creative problem-solving approaches to train students to get used to creative thinking skills in developing their life skills.
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