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Bayu, Hendi Hendra
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Education Engineering Environmental Science Immunology & microbiology Languange, Linguistic, Communication & Media Transportation

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Studi Pemanfaatan Limbah Penambangan Granit pada Karakteristik Kekuatan Tanah Laterit untuk Konstruksi Timbunan Jalan Irwan, Andesta Granitio; Arif, Maulana; Bayu, Hendi Hendra; Aditiawan, Riski; Panita, Shakila
Jurnal Rekayasa Sipil Vol 20, No 3 (2024)
Publisher : Civil Engineering Departement, Andalas University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrs.20.3.136-148.2024

Abstract

Tanah laterit lokal di Kepulauan Bangka Belitung menjadi salah satu material utama dalam konstruksi teknik sipil khususnya timbunan. Beberapa penelitian terkait tanah laterit memberikan anggapan bahwa seringkali tanah laterit mengalami kerusakan karena adanya air dan juga menyebabkan pemadatan menjadi berkurang. Penelitian ini bertujuan untuk mengidentifikasi spesifikasi dan karakteristik tanah laterit sebagai konstruksi timbunan dengan penambahan limbah debu granit sebagai bahan campuran untuk menstabilkan tanah sebagai timbunan. Penelitian dilakukan dengan skala laboratorium dengan pengujian sifat fisik dan mekanik pada tanah asli serta campuran debu granit sesuai skema campuran 0%, 5%, 10%, 15%, 25% dan 30%. Hasil menunjukkan bahwa tanah laterit lokal masuk dalam golongan Silty Clay berplastisitas sedang-rendah, penambahan debu granit memberikan perubahan pada karakteristik tanah sehingga terjadinya penurunan nilai plastisitas yang secara spesifikasi sesuai untuk timbunan. Penambahan debu granit menyebabkan pemadatan tanah menjadi lebih mudah dengan densitas yang meningkat dan kadar air yang menurun, pemadatan optimal terjadi pada campuran debu granit 30%. Penambahan debu granit meningkatkan nilai CBR pada tanah sehingga masuk ke dalam syarat spesifikasi timbunan jalan yaitu >6% untuk campuran 5-15% dan optimal pada 10%. Pengujian kuat tekan memperlihatkan bahwa peningkatan nilai kuat tekan setelah ditambahkan campuran debu granit dimana pada campuran 10% merupakan kondisi tanah memiliki kekuatan optimal pada beban aksial
Studi Pemanfaatan Limbah Penambangan Granit pada Karakteristik Kekuatan Tanah Laterit untuk Konstruksi Timbunan Jalan Irwan, Andesta Granitio; Arif, Maulana; Bayu, Hendi Hendra; Aditiawan, Riski; Panita, Shakila
Jurnal Rekayasa Sipil (JRS-Unand) Vol. 20 No. 3 (2024)
Publisher : Civil Engineering Departement, Andalas University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrs.20.3.136-148.2024

Abstract

Local laterite soil in the Bangka Belitung Islands is one of the main materials in civil engineering construction, especially embankments. Several studies related to laterite soil suggest that laterite soil is often damaged by water and also causes reduced compaction. This study aims to identify the specifications and characteristics of laterite soil as embankment construction with the addition of granite dust waste as a mixture to stabilize the soil as an embankment. The study was conducted on a laboratory scale by testing the physical and mechanical properties of the original soil and granite dust mixture according to the mixture scheme of 0%, 5%, 10%, 15%, 25% and 30%. The results show that local laterite soil is included in the Silty Clay group with medium-low plasticity, the addition of granite dust changes the characteristics of the soil so that there is a decrease in the plasticity value which is specifically suitable for embankments. The addition of granite dust makes soil compaction easier with increased density and decreased water content, optimal compaction occurs in a mixture of 30% granite dust. The addition of granite dust increases the CBR value of the soil so that it enters the road embankment specification requirements, namely >6% for a mixture of 5-15% and optimally at 10%. Compressive strength testing shows that the increase in compressive strength after the addition of granite dust mixture where the 10% mixture is the condition of the soil having optimal strength under axial load.
Isolation and Identification of Lactic Acid Bacteria from Channa sp. as Potential Probiotic Bayu, Hendi Hendra; Irwanto, Riko; Dalimunthe, Nurzaidah Putri; Lingga, Rahmad
JURNAL PEMBELAJARAN DAN BIOLOGI NUKLEUS Vol 9, No 1: Jurnal Pembelajaran Dan Biologi Nukleus March 2023
Publisher : Universitas Labuhanbatu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36987/jpbn.v9i1.3551

Abstract

Lactic acid bacteria (LAB) are a group of bacteria that are naturally present in the digestive tract of vertebrates, including fish such as Channa sp. Lactic acid bacteria are considered the most suitable microbes for use as probiotics. Probiotics can produce antimicrobial metabolites so that can improve the microbial balance in the digestive tract. It is believed that Channa sp. harbors LAB in its digestive tract, which may have probiotic potential and produce antimicrobial metabolites that can inhibit pathogenic bacteria. The aim of this study was to isolate and identify LAB from the intestines of Channa sp. The research involved several steps, including sample preparation, LAB isolation, characterization, and purification of bacterial isolates, biochemical tests, temperature resistance tests, antimicrobial tests, haemolysis tests, lactic acid production tests, and cholesterol-lowering activity tests. Eight LAB isolates with potential probiotic characteristics were isolated and identified as the genus Lactobacillus, which are gram-positive bacteria that produce lactic acid during culture
Persistence of Herpetofaunal Assemblages in Anthropogenic Landscapes: Insights from Rural Bangka Island, Indonesia Syafutra, Randi; Dalimunthe, Nurzaidah Putri; Priyansah, Sujadi; Bayu, Hendi Hendra; Handayani, Helvina; Kamal, Abdul; Wulan, Nur Azizah Nawang; Febriyani, Reani; Arrahmaan, Rydhollah
BIO PALEMBANICA Vol 2 No 2 (2025): Bio Palembanica
Publisher : Lembaga Penelitian, Pengabdian Kepada Masyarakat dan Kepustakaan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36982/bio.v2i2.6283

Abstract

Anthropogenic land-use change is a primary driver of global biodiversity loss, yet rural agricultural matrices often retain significant ecological function. This study assesses the composition, diversity, and microhabitat associations of herpetofauna in two human-modified landscapes (Air Duren and Cengkong Abang) in Bangka Regency, Indonesia. Fieldwork was conducted over three consecutive weeks in July 2022 using a time-constrained Visual Encounter Survey (VES) method (19:00–21:00). We recorded 13 individuals representing 7 species and 6 families. The assemblage was dominated by generalist amphibians (Fejervarya cancrivora, Duttaphrynus melanostictus) and synanthropic reptiles (Eutropis multifasciata, Gekko smithii). Notably, Cengkong Abang hosted forest-associated arboreal species, including Tropidolaemus wagleri, Boiga dendrophila, and Ahaetulla prasina, correlating with its higher structural vegetation complexity. Diversity analysis revealed a higher Shannon-Wiener index in Cengkong Abang (H' = 1.75) compared to Air Duren (H' = 1.33). The presence of arboreal and semi-aquatic guilds indicates that rural matrices can function as permeable habitats and secondary refugia. Conservation strategies in Bangka should prioritize the retention of vegetation complexity and stratified canopies within village landscapes to sustain herpetofaunal biodiversity.
Co-Authors Aditiawan, Riski Andesta Granitio Irwan Arif, Maulana Arrahmaan, Rydhollah Dalimunthe, Nurzaidah Putri Febriyani, Reani Handayani, Helvina Kamal, Abdul Lingga, Rahmad Panita, Shakila Priyansah, Sujadi Riko Irwanto Syafutra, Randi Wulan, Nur Azizah Nawang