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All Journal Journal of Nutrition College Universa Medicina Jurnal Medik Veteriner Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan JMTS: Jurnal Mitra Teknik Sipil Infotech: Journal of Technology Information Jurnal Teknik Sipil Cendekia (JTSC) Jurnal Manajemen Pemasaran dan Perilaku Konsumen Jurnal Abdimas Kesehatan Jurnal Widya Medika Jurnal Farmasi Sains dan Terapan (Journal of Pharmacy Science and Practice)
Wijaya, Hendy
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Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Environmental Science Health Professions Immunology & microbiology Medicine & Pharmacology Nursing Public Health Veterinary

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STATISTICAL CORRECTION OF A DYNAMIC PILE BEARING CAPACITY FORMULA BASED ON PDA DATA Angelina, Sherlin; Wijaya, Hendy; Iskandar, Ali; Johan, Agus; Kawanda, Aksan; Purnomo, Daniel Tri
JMTS: Jurnal Mitra Teknik Sipil Volume 8, Nomor 3, Agustus 2025
Publisher : Prodi Sarjana Teknik Sipil, FT, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmts.v8i3.34184

Abstract

The calculation of pile bearing capacity using a dynamic formula is considered a practical approach for evaluating the capacity of foundation piles. However, its results are often questioned when compared to the CAPWAP analysis outcomes derived from PDA testing. This study aims to assess the accuracy of the dynamic formula, develop a correction model using a statistical approach in the form MLR, and evaluate the effectiveness of the resulting correction model in predicting pile bearing capacity. A total of 84 pile datasets were utilized in this research, comprising various pile dimensions and PDA-derived parameters, including the maximum energy transferred to the pile (EMX), permanent pile settlement (S = DFN), and elastic settlement (C = DMX – DFN). The analysis results indicated that the dynamic formula could be corrected using the MLR approach. The correction model produced multiplier coefficients of 1.09 for parameter S and 0.67 for parameter C, with a coefficient of determination of 0.96 and a MAPE value of 19.21%, which represents the average deviation of the predicted results from the actual values and falls into the accurate category based on Lewis’ classification. The model is deemed sufficiently reliable for use as an alternative method in the preliminary evaluation of pile bearing capacity. Abstrak Perhitungan daya dukung tiang menggunakan formula dinamik merupakan pendekatan praktis dalam mengevaluasi kapasitas tiang fondasi. Namun, hasil perhitungannya kerap diragukan jika dibandingkan dengan hasil analisis CAPWAP dari uji PDA. Penelitian ini bertujuan untuk mengevaluasi akurasi formula dinamik, mengembangkan model koreksi dengan pendekatan statistik berupa MLR, serta menilai efektivitas model koreksi yang dihasilkan dalam memprediksi daya dukung tiang. Pada penelitian ini digunakan 84 data tiang dengan variasi dimensi tiang dan parameter dari uji PDA yang berupa energi maksimum yang tertransfer ke tiang (EMX), penurunan permanen tiang (S = DFN), dan penurunan elastis tiang (C = DMX – DFN). Hasil analisis menunjukkan bahwa formula dinamik dapat dikoreksi melalui pendekatan MLR. Model koreksi menghasilkan koefisien pengali untuk parameter S sebesar 1,09 dan C sebesar 0,67, serta memiliki koefisien determinasi sebesar 0,96 dan nilai MAPE yang menunjukkan rata-rata deviasi hasil prediksi terhadap aktual sebesar 19,21%, yang termasuk dalam kategori akurat menurut klasifikasi Lewis. Model ini dinilai cukup andal untuk digunakan sebagai pendekatan alternatif dalam tahap evaluasi awal daya dukung tiang.
ANALYSIS OF LOAD TRANSFER PLATFORM THICKNESS ON LOAD TRANSFER EFFECTIVENESS AND ROAD STABILITY IN SOFT SOIL Andrawan, Andrawan; Wijaya, Hendy; Iskandar, Ali; Johan, Albert
JMTS: Jurnal Mitra Teknik Sipil Volume 8, Nomor 3, Agustus 2025
Publisher : Prodi Sarjana Teknik Sipil, FT, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmts.v8i3.34188

Abstract

Reinforcement of road embankments on soft soils is a common challenge in infrastructure projects, especially in conditions of low bearing capacity and large settlement potential. One widely used solution is the pile embankment system with the addition of granular Load Transfer Platform. This study aims to numerically evaluate the effect of variations in LTP quality and thickness on system performance. Modeling was conducted using the two-dimensional finite element method, with variations in CBR values of 40% and 45%, and LTP thicknesses of 1 m, 1.5 m, and 2 m. The parameters analyzed include the amount of embankment settlement, slope safety factor, axial force on piles, and visualization of arching effect. The results showed that increasing the quality and thickness of the LTP was able to reduce embankment settlement and increase the factor of safety, especially under short-term conditions. The axial force on the piles also increased as the stiffness of the LTP increased, although at a certain thickness it was thought that there was more optimal force attenuation. These findings indicate the importance of appropriate LTP configuration in the design of soft soil reinforcement systems. Abstrak Perkuatan timbunan jalan di atas tanah lunak merupakan tantangan umum dalam proyek infrastruktur, khususnya pada kondisi daya dukung rendah dan potensi penurunan yang besar. Salah satu solusi yang banyak digunakan adalah sistem pile embankment dengan penambahan load transfer platform (LTP) berbahan granular. Penelitian ini bertujuan untuk mengevaluasi pengaruh variasi kualitas dan ketebalan LTP terhadap kinerja sistem secara numerik. Pemodelan dilakukan menggunakan metode elemen hingga dua dimensi, dengan variasi nilai CBR sebesar 40% dan 45%, serta ketebalan LTP 1 m, 1,5 m, dan 2 m. Parameter yang dianalisis meliputi besarnya penurunan timbunan, faktor keamanan lereng, gaya aksial pada tiang pancang, serta visualisasi arching effect. Hasil penelitian menunjukkan bahwa peningkatan kualitas dan ketebalan LTP mampu menurunkan penurunan timbunan dan meningkatkan faktor keamanan, khususnya pada kondisi jangka pendek. Gaya aksial pada tiang juga meningkat seiring peningkatan kekakuan LTP, meskipun pada ketebalan tertentu diduga terjadi peredaman gaya yang lebih optimal. Temuan ini menunjukkan pentingnya konfigurasi LTP yang tepat dalam desain sistem perkuatan tanah lunak.
Optimized RT-qPCR Detection of Hepatic Lipopolysaccharide-Binding Protein in Diet-Induced Obese Mice Tjahjono, Yudy; Wedharga, I Gede Putu Adhi; Novita, Bernadette Dian; Tahalele, Paul; Wijaya, Hendy; Soediono, Endang Isbandiati; Hendrata, Adi Pramono; Dewi, Sianty; Wijaya, Sumi; Ervina, Martha; Kuncorojakti, Suryo
Jurnal Medik Veteriner Vol. 8 No. 2 (2025): October
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jmv.vol8.iss2.2025.308-317

Abstract

High-throughput RT-qPCR results on hepatic lipopolysaccharide-binding protein (LBP) expression in obese subjects are essential, as they reveal the endotoxin’s role in the development of obesity and non-communicable disease (NCD). This study aimed to optimize RT-qPCR detection of LBP in diet-induced obese mice. This study primarily focused on addressing high variability through reference gene normalization. A total of six male C57BL/6 mice aged 6 weeks were randomly allocated into two dietary treatments (n = 3), consisting of mice fed with the standard chow diet (SCD group) and mice fed with the high-fat and high sucrose diet (HFHS group) ad libitum for 8 weeks. Relative quantification strategies involving the standard 2-ΔΔCt method (calibrator as mean) and the modified 2-ΔΔCt method (calibrator as individual sample-matched biological replicates) were compared in terms of their variability. Obesity was successfully induced in the HFHS treatment group, as indicated by significantly higher body weight, calorie intake, and LBP relative expressions compared to the SCD group. In addition, a sample-specific calibrator approach using the modified 2-ΔΔCt method resulted in lower variability in relative gene expression levels. A modified 2-ΔΔCt method, which utilizes a sample-specific calibrator to counteract sample-specific variability, was successfully employed to address high variability in RT-qPCR results.
Deteksi populasi Cd3+Cd4+Cd25+Foxp3+ T-regulator pada Limpa Mencit Galur Balb/c dan Swiss-webster yang Mudah dan Cepat dengan Metode Flow Cytometry Tjahjono, Yudy; Wijaya, Hendy; Esar, Senny Yesery; Caroline, Caroline; Jafet, Nico; Kusuma, I Made Andika Bara; Chrisantia, Oryza; Bhendy, Maria Theresia Primadewy; Palpialy, Sindi Siska; Soehadi, Shellin; Wilianto, Yufita Ratnasari
Jurnal Farmasi Sains dan Terapan (Journal of Pharmacy Science and Practice) Vol. 9 No. 2 (2022): October
Publisher : Faculty of Pharmacy, Widya Mandala Surabaya Catholic University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33508/jfst.v9i2.4079

Abstract

Sel T-regulator (Treg) memainkan peran kunci dalam mengendalikan autoimunitas, respon alergi, peradangan, dan respons terhadap infeksi. Sel T Cd4+ yang secara konstitutif mengekspresikan Cd25 dan protein forkhead 3 (Foxp3; yaitu, Cd3+Cd4+Cd25+Foxp3+) atau disebut juga sebagai Treg fungsional, telah terbukti memainkan peran utama dalam pemeliharaan toleransi dan homeostasis imun, sehingga deteksi Treg fungsional sangat penting dilakukan sebagai salah satu parameter imunomodulasi. Penelitian ini bertujuan untuk mendeteksi populasi sel Treg (Cd3+Cd4+Cd25+Foxp3+) pada organ limpa mencit galur Balb/c dan Swiss-webster dengan menggunakan metode yang mudah, cepat, serta terjangkau. Metode deteksi sel Treg dilakukan dengan cara isolasi organ limpa mencit Balb/c dan Swiss-webster kemudian dilakukan preparasi dan deteksi sel menggunakan instrumen flow cytometry. Hasil populasi sel Treg yang didapatkan berturut-turut pada mencit Balb/c dan Swiss-webster adalah 2,02 ± 0,36% dan 3,14 ± 1,64% dari total populasi yang dideteksi dengan hanya membutuhkan waktu 145 menit sejak pembedahan. Berdasarkan hasil tersebut dapat disimpulkan bahwa pengamatan populasi sel Treg pada splenosit mencit galur Balb/c dan Swiss-webster dengan flow cytometry dapat dilakukan dengan mudah dan praktis dengan pewarnaan kombinasi antibodi yang tertera pada manuskrip ini. Selain itu, metode pewarnaan yang tertera dapat digunakan sebagai salah satu acuan untuk mendeteksi imunomodulator pada berbagai model hewan coba yang menggunakan mencit galur Balb/c dan Swiss-webster, khususnya yang berhubungan dengan populasi sel Treg.
Pelatihan Pembuatan Water Kefir sebagai Minuman Probiotik Caroline, Caroline; Ervina, Martha; Hadinugroho, Wuryanto; Esar, Senny Yesery; Wijaya, Hendy; Tjahjono, Yudi; Handayani, Yuliastuti Ika; Sutedja, Anita Maya
Jurnal Abdimas Kesehatan (JAK) Vol. 6 No. 2 (2024): Juni
Publisher : Universitas Baiturrahim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36565/jak.v6i2.620

Abstract

Christ the King of Surabaya Parish through the Socio-Economic Development Section (PSE) in collaboration with Widya Mandala Catholic University Surabaya, was committed to assisting the Indonesian government's program in terms of improving the post-pandemic family economy through training in making health drinks from herbal ingredients, namely water kefir, which has been used as a probiotic drink. The training participants were underprivileged families in the Parish of Christ the King Surabaya. The training was carried out for 1 day with presentation of material by the team, training implementation and training evaluation by filling out pre-tests, post-tests and questionnaires as well as 30 days of assistance for participants who were interested in developing products to improve their economy. The results of the training show high enthusiasm from the participants, an increase in the knowledge of the participants which was marked by an increase in the value of the posttest compared to the pretest and the desire of the participants to produce and market products to improve the family economy
ANALISIS PERBANDINGAN PENURUNAN TERHADAP DAYA DUKUNG FONDASI TIANG PADA TANAH EKSPANSIF DI KARAWANG JAWA BARAT Lai, Jason Lai Wijaya; Wijaya, Hendy; Yuwono, Amelia
JMTS: Jurnal Mitra Teknik Sipil Volume 6, Nomor 4, November 2023
Publisher : Prodi Sarjana Teknik Sipil, FT, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmts.v6i4.24694

Abstract

The bearing capacity of a foundation is one of the factors in calculating the design of a structure. The calculation for bearing capacity and settlement is controlled by the characteristics of the soil. Expansive soil is a type of soil where it has a drastic swelling and shrinking characteristics based water content contained inside. This journal will discuss one of the factory construction projects located in Karawang, West Java. The foundation is of spun concrete pile with a diameter of 35 cm. Soil data testing consisted of 12 borelog tests, 38 cpt tests, and 24 laboratory tests. Calculation of bearing capacity used are of six methods. Two methods are used for settlement calculation. Results of theoretical calculations will be compared with results from Pile Driving Analyzer (PDA). The difference in settlement calculation based on semi-empirical method is 0.02% for W-1288 pile, and 2.39% for W-1623 pile. As for the Davisson method, the difference in settlement calculations is 20.02% for W-1288 pile, and 13.82% for W-1623 pile. The comparison between the relationship of ultimate bearing capacity (RMX) and maximum settlement value (DMX) has no correlation because of the different factors that differ in soil characteristics on each tested pile. Abstrak Daya dukung sebuah fondasi adalah salah satu faktor dalam perhitungan desain pembangunan sebuah struktur. Faktor perhitungan daya dukung dan penurunan tanah dikendalikan oleh karakteristik tanah yang tersedia. Tanah ekspansif adalah salah satu macam tanah dimana tanah tersebut memiliki karakteristik kembang dan susut yang drastis berdasarkan kadar air yang terkandung didalamnya. Jurnal ini akan membahasa salah satu proyek pembangunan pabrik yang terletak di Karawang, Jawa Barat. Fondasi yang diperhitungkan dan dibangunan adalah fondasi tiang pancang beton spun dengan ukuran diameter 35cm. Pengujian data tanah berupa 12 uji borelog, 38 uji sondir, serta 24 uji sampel laboratorium. Perhitungan daya dukung fondasi akan menggunakan enam metode dalam perhitungan. Perhitungan penurunan akan menggunakan dua metode yakni metode semi-empiris dan metode Davisson. Hasil perhitungan teoritis akan dibandingkan dengan hasil pengujian fondasi dengan sistem Pile Driving Analyzer (PDA). Perbedaan perhitungan penurunan berdasarkan metode semi–empiris adalah 0,02% untuk tiang W-1288, dan 2,39% untuk tiang W-1623. Sedangkan untuk metode Davisson, perbedaan perhitungan penurunan adalah 20,02% untuk tiang W-1288, dan 13,82% untuk tiang W-1623. Selanjutnya, perbandingan antara hubungan nilai daya dukung ultimit (RMX) terhadap nilai penurunan maksimum (DMX) tidak memiliki korelasi dikarenakan terdapat faktor perbedaan parameter tanah pada setiap tiang yang diuji.
EVALUASI PENGGUNAAN RANGKA BAJA HOLLOW SEBAGAI SISTEM PENYANGGA BEKISTING PLAT LANTAI PADA PROYEK X Wijaya, Angga; Wijaya, Hendy
JMTS: Jurnal Mitra Teknik Sipil Volume 7, Nomor 1, Februari 2024
Publisher : Prodi Sarjana Teknik Sipil, FT, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmts.v7i1.26666

Abstract

In the construction industry, the protection of formwork is a crucial aspect in designing and constructing sturdy and safe structures. Therefore, the success of an effective and efficient formwork support system plays a crucial role in ensuring the safety of the structure. One solution implemented in this industry is the use of hollow steel (square-shaped pipes) as a formwork support system for floor plates. This study presents the results of the analysis of hollow steel used in construction, particularly in buildings. The research aims to determine the ability of hollow steel in supporting the load of floor formwork. Data collection methods involve observation, interviews, and testing using a structural analysis program to determine the strength of hollow steel in supporting the load of floor formwork. The research results indicate that the hollow steel frame has a deflection of 0.0641 m, where the deflection is still below the maximum allowable limit. The hollow steel frame produces balanced lateral forces and moment forces, making it safe for use. However, the strength ratio of the steel frame does not meet the requirements due to a strength ratio greater than 1. Therefore, additional support is needed in the middle of the floor plate. Abstrak Dalam industri konstruksi, perlindungan terhadap bekisting merupakan aspek yang sangat krusial dalam merancang dan membangun struktur yang kokoh dan aman. Oleh karena itu, keberhasilan sistem penyangga bekisting yang efektif dan efisien memiliki peran yang sangat penting dalam memastikan keselamatan struktur. Salah satu solusi yang telah diimplementasikan di dalam industri ini adalah penerapan baja hollow (pipa berbentuk kotak) sebagai sistem penyangga bekisting plat lantai. Studi ini menyajikan hasil analisis baja hollow yang digunakan dalam konstruksi khususnya pada bangunan. Penelitian ini bertujuan untuk mengetahui kemampuan baja hollow dalam menahan beban bekisting plat lantai. Metode pengumpulan data dilakukan dengan melakukan pengamatan dan melakukan wawancara, serta untuk metode pengujian dilakukan dengan menggunakan salah satu program analisis struktur untuk menentukan kekuatan baja hollow dalam menahan beban bekisting plat lantai. Hasil penelitian menunjukkan bahwa rangka baja hollow memiliki lendutan sebesar 0,0641 m dimana besar lendutan yang terjadi masih di bawah batas maksimum lendutan yang diperbolehkan dan rangka baja hollow menghasilkan gaya dalam lintang dan gaya dalam momen yang seimbang, sehingga rangka hollow aman untuk digunakan. Namun rasio kekuatan dari rangka baja belum memenuhi persyaratan karena terdapat rasio kekuatan yang lebih besar dari pada 1, maka diperlukan penyangga tambahan pada bagian tengah plat lantai.
PENGGUNAAN GEOCELL UNTUK STABILISASI DAN PERLINDUNGAN EROSI PADA LERENG Wijaya, Hendy; Gregorius Sandjaja Sentosa; Tascia Adde Marcellia; Aniek Prihatiningsih; Ricky Putra
JMTS: Jurnal Mitra Teknik Sipil Volume 6, Nomor 4, November 2023
Publisher : Prodi Sarjana Teknik Sipil, FT, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmts.v6i4.27066

Abstract

The world of construction is experiencing continuous development, in its development, there are many methods of carrying out modern construction, one of which is about strengthening slopes to increase the safety factor of slope stability. Slopes are natural or man-made contours or reliefs that can occur because of construction projects. In its development, one method for increasing slope stability for modern construction is using geocells. Geocell is an artificial material that can protect a slope from erosion factors and add a safety factor for slope stabilization. Geocell was developed by the US Army Corps of Engineering (USACE) in 1970, made from high density polyethylene (HPDE), and there are two types of geocell, namely smooth and rough. This research uses a comparison of several studies to show or determine the effectiveness and usefulness of geocells on a slope. It was found that the use of geocells can increase the erosion resistance of a slope to external factors and increase the safety factor of slope stability. However, the increase in slope stability due to the installation of geocells is also influenced by many factors, such as the characteristics or size of the geocells, the depth of the geocell installation, the characteristics of the soil, and the number of geocell installations. Based on research, it was concluded that the installation of geocells, although proven to increase safety factors from 0.789 to 1.7054, also requires consideration of environmental conditions and slope conditions. For this reason, it is necessary to review or re-inspect the field conditions for the geocell installation location. Abstrak Dunia konstruksi mengalami perkembangan terus menerus, dalam perkembangannya, terdapat banyak cara metode pelaksanaan konstruksi modern, salah satu konstruksi adalah mengenai perkuatan lereng untuk meningkatkan faktor keamanan kestabilan suatu lereng. Lereng merupakan kontur atau relief alami maupun buatan manusia yang bisa terjadi akibat adanya proyek konstruksi, dalam perkembangannya, salah satu metode untuk meningkatkan kestabilan lereng untuk konstruksi modern adalah menggunakan geocell. Geocell merupakan material buatan yang dapat melindungi suatu lereng dari faktor erosi serta menambah faktor keamanan untuk stabilisasi lereng. Geocell dikembangkan oleh US Army Corps of Enginnering (USACE) pada tahun 1970, terbuat dari bahan High Density Polyethylene (HPDE). Penelitian ini menggunakan perbandingan beberapa penelitian untuk menunjukkan atau menentukan efektifitas dan kegunaan geocell dalam suatu lereng. Ditemukan bahwa kegunaan geocell dapat meningkatkan ketahanan erosi suatu lereng terhadap faktor eksternal dan meningkatkan faktor keamanan stabilitas lereng. Akan tetapi, peningkatan stabilitas lereng akibat pemasangan geocell juga dipengaruhi oleh banyak faktor, seperti karakteristik atau ukuran geocell, kedalaman pemasangan geocell, karakteristik tanah, dan jumlah pemasangan geocell. Berdasarkan penelitian, ditemukan kesimpulan bahwa pemasangan geocell, walaupun terbukti meningkatkan faktor keamanan, yaitu peningkatan dari nilai 0,789 menjadi 1,7054, akan tetapi juga perlu dipertimbangkan kondisi lingkungannya dan kondisi lereng eksisting. Untuk itu, diperlukan peninjauan atau inspeksi ulang terhadap kondisi lapangan untuk lokasi pemasangan geocell.
PROTOCOL OPTIMIZATION OF RT-qPCR FOR NF-ΚB DETECTION IN CARDIAC TISSUE FROM HFHS-FED MICE Jaya, Ferdinand Wiliam; Novita, Bernadette Dian; Suwandito, Laurensius; Wijaya, Hendy; Tjahjono, Yudy; Hendrata, Adi Pramono; Dewi, Sianty; Wijaya, Sumi; Ervina, Martha; Kuncorojakti, Suryo
JURNAL WIDYA MEDIKA Vol. 12 No. 1 (2026): March
Publisher : FAKULTAS KEDOKTERAN UNIVERSITAS KATOLIK WIDYA MANDALA SURABAYA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33508/jwm.v12i1.8196

Abstract

Accurate detection of gene expression in challenging tissues requires methodological optimization to ensure reproducibility. Cardiac tissue, with its low cell density and variable RNA yield, presents particular difficulties for RT‑qPCR analysis. This study aimed to refine NF‑κB detection in HFHS‑fed C57BL/6 mice by comparing a standard 2‑ΔΔCt approach with an optimized protocol incorporating individualized calibrators adjusted for RNA concentration. Six male mice were divided into standard-diet (STD) and high‑fat, high‑sucrose (HFHS) groups, and cardiac RNA was extracted after 8 weeks of feeding. While relative NF‑κB expression trends were higher in the HFHS group, differences were not statistically significant; however, the optimized method consistently reduced variability and improved measurement reliability compared to the generalized approach. These findings highlight the value of individualized calibration as a protocol refinement for RT‑qPCR, offering a more rational framework for gene expression analysis in heterogeneous or technically demanding tissue samples.
ANALYSIS OF THE EFFECT OF CH₃COOH ADDITION ON SOIL IMPROVEDWITH 10 % LIME CONTENT Andrianus, Matthew; Wijaya, Hendy; Iskandar, Ali
JMTS: Jurnal Mitra Teknik Sipil Volume 9, Nomor 1, Februari 2026
Publisher : Prodi Sarjana Teknik Sipil, FT, Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmts.v9i1.36754

Abstract

Acid rain is a serious threat to the durability of geotechnical infrastructure, particularly in highly polluted industrial areas such as Jakarta. This phenomenon may damage the stability of chemically improved road subgrade through the dissolution of binding materials. This study aims to evaluate the strength degradation of subgrade soil stabilized with 10% lime under acid exposure. A laboratory experimental method was conducted by comparing native Puri Indah soil with lime-stabilized soil under three immersion conditions: no immersion (control) to determine initial strength, normal water immersion (pH 7.02) to simulate typical flooding, and acetic acid immersion (pH 5.21) to simulate extreme acid rain. The results indicate that 10% lime stabilization in the control condition produced a high CBR value of 46%. Normal water immersion caused a slight decrease to 44%, while acid exposure resulted in severe degradation with CBR dropping sharply to 27%. The significant gap between water and acid immersion confirms chemical deterioration due to neutralization reactions dissolving lime binders. It is concluded that although 10% lime effectively increases initial strength, this content lacks sufficient alkalinity to withstand long-term acid attack. Abstrak Hujan asam merupakan ancaman serius bagi durabilitas infrastruktur geoteknik, khususnya di kawasan industri padat polusi seperti Jakarta. Fenomena ini berpotensi merusak stabilitas tanah dasar jalan yang telah diperbaiki secara kimiawi melalui mekanisme pelarutan bahan pengikat. Penelitian ini bertujuan untuk mengevaluasi degradasi kekuatan tanah dasar yang distabilisasi dengan kapur kadar 10% akibat paparan asam. Metode eksperimental laboratorium dilakukan dengan membandingkan karakteristik tanah asli Puri Indah dengan tanah campuran kapur pada tiga kondisi perendaman: tanpa rendaman (kontrol) untuk mengetahui kekuatan awal, rendaman air biasa (pH 7,02) sebagai simulasi genangan normal, dan rendaman larutan asam asetat (pH 5,21) sebagai simulasi hujan asam ekstrem. Hasil pengujian menunjukkan bahwa stabilisasi kapur 10% pada kondisi kontrol menghasilkan nilai CBR yang tinggi sebesar 46%. Perendaman air biasa menyebabkan sedikit penurunan kekuatan fisik menjadi 44%. Namun, paparan asam menyebabkan degradasi yang jauh lebih parah dengan nilai CBR jatuh drastis hingga 27%. Selisih degradasi yang signifikan antara perendaman air dan asam membuktikan terjadinya kerusakan kimiawi struktur tanah akibat reaksi netralisasi yang melarutkan bahan pengikat kapur. Disimpulkan bahwa meskipun kapur 10% efektif meningkatkan kekuatan awal, kadar ini belum memiliki kapasitas alkalinitas yang cukup untuk menahan serangan asam dalam jangka panjang.
Co-Authors Andrawan, Andrawan Andrianus, Matthew Andy Prabowo Angelina, Sherlin Angga Wijaya, Angga Aniek Prihatiningsih Anita Maya Sutedja Arif Sandjaya Bhendy, Maria Theresia Primadewy Carolina, Erny Caroline Caroline Chrisantia, Oryza Esar, Senny Yesery Five, Johny Gotharia, Eduard Antero Gregorius Sandjaja Sentosa Gunawan, Mikael Dylan Handayani, Yuliastuti Ika Hendrata, Adi Pramono Iskandar Ali Jafet, Nico Jaya, Ferdinand Wiliam Johan, Agus Johan, Albert Jonathan Jonathan Jong, FX Himawan Haryanto Kawanda, Aksan Kuncorojakti, Suryo Kusuma, I Made Andika Bara Lai, Jason Lai Wijaya Leo Aldianto Liucius, Yenny Untari Lo, Alvin Lucia Hendriati Malonda, Franklin Vincentius Martha Ervina Novita, Bernadette Dian Palpialy, Sindi Siska Paul L Tahalele Purnomo, Daniel Tri Putra, Brilliant Dwi Ricky Putra Sianty Dewi Silvester Boenyamin, Michael Siti Surdijati, Siti Soediono, Endang Isbandiati Soehadi, Shellin Sumi WIjaya, Sumi Susiyanti, Meli Suwandito, Laurensius Tascia Adde Marcellia Teguh Widodo Tjahjono, Yudi Tjahjono, Yudy Wedharga, I Gede Putu Adhi Wilianto, Yufita Ratnasari Wuryanto Hadinugroho