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Achmad Pahrul Rodji
Universitas Krisnadwipayana
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ANALYSIS OF THE USE OF ACRYLIC WASTE AS A PARTIAL SUBSTITUTION OF COARSE AGGREGATE FOR CONCRETE COMPRESSIVE STRENGTH DEDY RAMADHAN; ACHMAD PAHRUL RODJI; INDRIASARI
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 4 No. 02 (2024): INTERNATIONAL JOURNAL OF MULTISCIENCE - MAY -AUGUST 2024
Publisher : CV KULTURA DIGITAL MEDIA

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Abstract

Acrylic, or polymethyl methacrylate, is a synthetic polymer that has superior properties compared to glass, such as flexibility, light weight, easy to process (cut, drill, polish), and can be formed into various complex shapes through thermal processes. This material has advantages in resistance to impact and weather conditions, and is environmentally friendly because it can be recycled. Acrylic is widely used in industries, including advertising, automotive, and interior design, due to its ease of processing and aesthetics. However, the production of acrylic products is still considered inefficient and expensive, triggering the need for new tools for the bending process to increase the efficiency of making acrylic-based products. Based on the results of the average concrete compressive strength test for normal concrete at the age of 28 days is 11.94 Mpa, the compressive strength results are less than the planned concrete quality of 25 Mpa; Based on the research results, it was found that concrete using acrylic waste as a partial replacement for coarse aggregate at the age of 28 days at a variation of 3% was 13.94 MPa, a variation of 5% was 24.87 MPa and a variation of 7% was 7.97 MPa, so it can be concluded that the more acrylic waste mixture for the compressive strength of concrete, the results will decrease.
ANALYSIS OF FLEXURAL STRENGTH OF BEAM USING SUBSTITUTION OF BROKEN GLASS BULB AS FINE AGGREGATE ADDITIONAL MATERIAL FADLUL ADLI; ACHMAD PAHRUL RODJI; SUKADI
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 4 No. 02 (2024): INTERNATIONAL JOURNAL OF MULTISCIENCE - MAY -AUGUST 2024
Publisher : CV KULTURA DIGITAL MEDIA

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Abstract

Concrete is the main material in building construction, consisting of a mixture of coarse aggregate (gravel), fine aggregate (sand), cement, and water. Concrete is widely used because of its strength, ease of forming, and durability. The SNI standard defines concrete as a mixture of portland cement, aggregate, and water to which other materials can be added to form a solid mass. With the high demand for concrete with compressive and flexural strength, innovations continue to be developed, including the use of substitute materials such as broken glass bulbs to improve concrete quality. This study will examine the effect of broken glass bulbs on the flexural strength of concrete. The use of glass bulb waste increases the flexural strength of concrete. The increase depends on the percentage of waste in the concrete mixture, with test results showing an increase in flexural strength of 0.5 - 2 KN compared to normal concrete. In experiments with 5% and 10% waste, the flexural strength of the beam reached 27 KN and 25 KN after 28 days, respectively, while normal concrete had a flexural strength of 26 KN. These results meet the Indonesian National Standard SNI 03 - 4431 1997.
Analisis Hambatan Samping Di Jalan Alternatif Inspeksi Banjir Kanal Timur Terhadap Kemacetan Jalan Basuki Rahmat Sukadi; Achmad Pahrul Rodji; Rifky Arrahman
Jurnal Sipil Krisna Vol 9 No 2 (2023): Jurnal Sipil Krisna
Publisher : Fakultas Teknik Universitas Krisnadwipayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61488/sipilkrisna.v9i2.421

Abstract

In the land transportation system, the availability of proper and adequate infrastructure greatly affects the smoothness of traffic. The existence of small businesses along the road is a side obstacle factor that reduces road performance. This happened along the Jalan Alternatif Inspeksi Banjir Kanal Timur, there were many traders on the roadside, pedestrians, vehicles going in and out, slowing down vehicles, and parking vehicles. Vehicles that should be able to pass the Jalan Alternatif Inspeksi Banjir Kanal Timur, prefer to go through Jalan Basuki Rahmat due to congestion. This caused traffic on Jalan Basuki Rahmat to jam due to the impact of congestion on the Jalan Alternatif Inspeksi Banjir Kanal Timur. The research was conducted for 4 (four) days, namely Monday, Thursday, Saturday and Sunday (July 13-19, 2020). The research time was carried out every morning (6.30 AM to 8.30 AM), noon (11.00 AM to 1.00 PM), afternoon (5.00 PM to 7.00 PM), and evening (7 PM to 10.00 PM) with traffic volume data, vehicle speed, and side obstacles every 15 minutes for the Jalan Basuki Rahmat (direction to Jakarta) and the Jalan Alternatif Inspeksi Banjir Kanal Timur (two-way). In addition, data on the width and length of the roads under review are also taken. Further analysis was conducted with reference to the MKJI 1997. From the research results, the capacity of Jalan Basuki Rahmat (direction to Jakarta) without side obstacles is 718 pcu/hour and with side obstacles 639 pcu/hour. Meanwhile, the capacity of the Jalan Alternatif Inspeksi Banjir Kanal Timur (two-way) without side obstacles is 1452 pcu/hour and with side obstacles 1148 pcu/hour. The peak of the side obstacles on the Jalan Alternatif Inspeksi Banjir Kanal Timur occurs from the afternoon until the evening (the highest saturation degree value is 1.97 = F), at the same time there is also traffic density on Jalan Basuki Rahmat.
ANALYSIS OF PILE FOUNDATION PLANNING IN THE CONSTRUCTION OF THE PKK - DEKRANASDA BUILDING IN MAKASSAR CITY GEDE SUMANTRA; ACHMAD PAHRUL RODJI; SAHAT MARTUA SIHOMBING
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 5 No. 01 (2025): INTERNATIONAL JOURNAL OF MULTISCIENCE - JANUARY-APRIL 2025
Publisher : CV KULTURA DIGITAL MEDIA

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Abstract

Concrete consists of cement, sand, gravel and water, with cement being the main binder that affects its quality. However, the increasing cost of raw materials and the environmental impact of lime mining and sand dredging are challenges in construction. To address this, the study proposed the use of bamboo fiber as an environmentally friendly and economical additive. This study tested the variation of 0%, 10%, and 15% pulung bamboo fiber waste on the compressive strength of concrete. The results showed that normal concrete without bamboo fiber had a compressive strength of 452 kN (fc' 26.08 MPa). The addition of 10% bamboo fiber decreased the compressive strength to 404 kN (fc' 23.32 MPa), while the addition of 15% decreased it further to 393 kN (fc' 22.68 MPa). The more bamboo fiber added, the more the compressive strength of the concrete decreased.
Analisis Penggunaan Limbah Serbuk Granit Sebagai Pengganti Sebagian Agregat Halus Pada Kuat Tekan Beton Aditya Maulana; Achmad Pahrul Rodji; Yonas Prima Arga Rumbyarso
Nusantara Journal of Multidisciplinary Science Vol. 3 No. 1 (2025): NJMS - Agustus 2025
Publisher : PT. Inovasi Teknologi Komputer

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Abstract

Beton merupakan salah satu material struktur yang banyak digunakan pada konstruksi bangunan, jembatan, jalan, dan sebagainya. Pengembangan material beton terus dilakukan, salah satunya melalui inovasi pemanfaatan limbah industri sebagai bahan substitusi agregat, dengan tujuan meningkatkan mutu beton sekaligus mengurangi dampak lingkungan. Penelitian ini bertujuan untuk menganalisis nilai kuat tekan beton dengan memanfaatkan limbah serbuk granit sebagai substitusi sebagian agregat halus sebesar variasi 0%, 9%, dan 13% dengan mutu beton f’c 25 (Mpa) setara k 300. Umur pengujian dilakukan pada 7, 14, dan 28 hari. Penelitian dilaksanakan menggunakan metode eksperimen di Laboratorium Beton PT. Pionirbeton Industri, Karawang Timur. Hasil pengujian kuat tekan rata-rata beton normal tanpa campuran limbah serbuk granit 0% menghasilkan kuat tekan beton sebesar 18,94 Mpa (7 hari), 23,16 Mpa (14 hari), 27,86 Mpa (28 hari). Beton dengan substitusi serbuk granit sebesar 9% menghasilkan kuat tekan beton sebesar 17,93 Mpa (7 hari) , 22,06 Mpa (14 hari), dan 22,23 Mpa (28 hari). Sedangkan pada variasi 13% diperoleh kuat tekan beton sebesar 17,05 Mpa (7 hari), 22,08 Mpa (14 hari), dan 22,69 Mpa (28 hari). Berdasarkan hasil tersebut, kuat tekan pada variasi 9% dan 13% menunjukkan penurunan kekuatan. Kesimpulan dengan penambahan limbah serbuk granit sebagai pengganti sebagian agregat halus mempengaruhi turunnya mutu beton yang direncanakan
Co-Authors Aditya Maulana Ahmad Supriyatna Al Muzamil Ali Khumaidi Asaddulah Mumtaz DANIEL SIMATUPANG Deby Marc Handoyo DEDY RAMADHAN FADLUL ADLI Ferry Anggriawan Gali Pribadi GEDE SUMANTRA Gita Puspa Artiani Hendi Suhendraya Muchtar Hudzaifah Al jihad Iim Wasliman Indriasari Indriasari Lydia Darmiyanti Mochammad Risky Ramadhan Muhammad Fahmi Tri Susilo Nandang Koswara Novi Ruhviyanti Novi Rukhviyanti Novrihan Tanjung PANDU ARIFIN Parlindungan Panjaitan Qawi Ayadillah Hariyanto Rifky Arrahman Sahat Martua Sihombing Sahat Martua Sihombing Sepryhatin Dioputra Sukadi Wargijono Utomo Yonas Prima Arga Rumbyarso