http://journal.amca2012.org/index.php/ajst/issue/feed 2024-08-05T17:00:50+00:00 Editor ajst@amca2012.org Open Journal Systems <p><strong>AMCA Journal of Science and Technology</strong> (<strong>AJST</strong>) is the official international journal published by the Association of Muslim Community in ASEAN (AMCA) which emphasizes on Science and Technology used in daily life. <strong>AJST</strong> publishes scientific research as an international forum for the dissemination, discussion, and critical review of science and technology information informed by scientific research. Through the publication of this journal can provide benefits for the development of science and technology and its impact, as well as a means of discussion for researchers in the field of science and technology. <strong>AJST</strong> is issued twice a year (February and August). The journal is published in the online version, is free access and download.</p> <p><a><span class="blockTitle">e-ISSN 2774-8324 </span></a></p> http://journal.amca2012.org/index.php/ajst/article/view/397 2024-08-05T17:00:50+00:00 Elizar Elizar elizar@eng.uir.ac.id Deddy Purnomo Retno elizar@eng.uir.ac.id Joleha Joleha elizar@eng.uir.ac.id Faisal Faisal elizar@eng.uir.ac.id Dandio Ahmad Fansuri elizar@eng.uir.ac.id

<p>One of the main components in concrete mixtures is aggregate, and thus the quality of the aggregate will affect the quality of the concrete. This research analyses the abrasion resistance of andesite and sandstone as concrete aggregates. The research method involves abrasion testing based on SNI 03-2417-2008 using the Los Angeles machine. The abrasion value is calculated from the percentage of the test sample's weight lost after undergoing the grinding process in the Los Angeles machine. The research results show that the abrasion value of andesite is 12.4%, lower than sandstone at 66%. Compressive strength test results at the age of 28 days for andesite is 32.35 MPa while sandstone is 11.70 MPa. This means that the andesite is more resistant to wear or friction. The low abrasion value of andesite is due to its denser and stronger crystal structure. In contrast, sandstone has a loose granular structure, making it prone to wear. Based on these results, it can be concluded that andesite is more suitable for use as a concrete aggregate than sandstone because it has better abrasion resistance and compressive strength higher. High abrasion resistance in aggregates will enhance the durability and service life of the concrete.</p>

2024-05-24T00:00:00+00:00 Copyright (c) 2025 Elizar Elizar, Retno Deddy Purnomo , Joleha, Faisal, Fansuri Dandio Ahmad http://journal.amca2012.org/index.php/ajst/article/view/135 2022-02-25T07:07:31+00:00 Desi Sri Pasca Sari desisripascasari@gmail.com Fauziansyah Fauziansyah desisripascasari@gmail.com Akbaruddin Akbaruddin desisripascasari@gmail.com Syariani Tambunan desisripascasari@gmail.com Nico Syahputra Sebayang sebayangns@gmail.com

<p>This study aims to determine the effect of the dose of solid bokashi fertilizer and determine the best dose on the growth of maize (Zea mays L.). The research was carried out in Matang Seping Village, Kec. Banda Mulia, Kab. Aceh Tamiang. The time of the study was carried out from October to December 2019. This study used a Randomized Block Design (RAK), which was given treatment and was non-factorial. The dose factor of bokashi fertilizer with notation (P), which consists of levels, namely: P0 = Without Bokashi, P1 = 200 grams, P2 = 300 grams, P3 = 400 grams. , 4th week and 6th week gave a significant effect on P3 treatment, namely at a dose of 400 grams/plant on the growth of plant height, stem diameter and number of leaves on corn (Zea mays L.).2.Use of solid bokashi fertilizer in the 2nd week, 4th week to 6th week can spur the growth of corn plants so that it has a significant effect on plant height, stem diameter and number of leaves on corn plants (Zea mays L.) in P3 treatment with a dose of 400 grams / plant.</p>

2024-07-02T00:00:00+00:00 Copyright (c) 2025 Desi Sri Pasca Sari, Fauziansyah, Akbaruddin, Syariani Tambunan, Nico Syahputra Sebayang