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All Journal Jurnal Konstruksia Prosiding Semnastek Kilat Forum Mekanika Borneo Engineering : Jurnal Teknik Sipil JURNAL IT: Media Infromasi STMIK Handayani Makassar Fokus Elektroda: Energi Listrik, Telekomunikasi, Komputer, Elektronika dan Kendali) Indonesian Journal of Construction Engineering and Sustainable Development Jurnal Sipil Krisna
Abdul Rokhman
Institut Teknologi PLN
Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Transportation

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KELECAKAN DAN KEKUATAN TEKAN BETON BERBASIS ABU TERBANG SEBAGAI PENGGANTI SEMEN DAN BATU APUNG UNTUK PENGGANTI AGREGAT KASAR Muhammad Sofyan; Ade Okvianti Irlan; Jansen Zadrak Korobu; Abdul Rokhman
INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CESD) Vol. 5 No. 2 (2022): INDONESIAN JOURNAL OF CONSTRUCTION ENGINEERING AND SUSTAINABLE DEVELOPMENT (CES
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/cesd.v5i2.15732

Abstract

Concrete's drawback is its low tensile strength and heavy weight, which may exceed 2400 kg/m3. The significance of self-weight in building construction is essential, particularly when dealing with seismic loads. The larger the inertial force from the weight of the structure itself, the greater the inertial force from the weight of the building itself, therefore lightweight concrete can provide an opportunity to lower its own weight with a smaller unit weight of 1850 kg/m3. Fly ash was employed as a substitute for cement in this investigation, while pumice was used as a substitute for coarse aggregate. The goal of this research was to establish the unit weight, compressive strength, and workability/slump value of concrete. In this investigation, 30% of the fly ash was utilized. Pumice is determined at 0%, 5%, 10%, and 15% of the weight of coarse aggregate. The SN sample has the highest slump value of 8.8. However, the slump value continued to fall with the addition of pumice. The use of larger pumice stone results in   a reduction in the volume weight of concrete up to 1845 kg/m3, permitting it to be classified as lightweight concrete. Pumice has been demonstrated to diminish strength by 11% on average for every 5% replacement
Pemanfaatkan Subtitusi Fly Ash dan Bahan Kapur Alam untuk Peningkatan Mutu Paving Block Abdul Rokhman; Dhani Van Chairi
Jurnal Sipil Krisna Vol 8 No 2 (2022): JURNAL SIPILKRISNA
Publisher : Fakultas Teknik Universitas Krisnadwipayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61488/sipilkrisna.v8i2.168

Abstract

Utilization of waste materials as building materials is a solution to reduce waste materials that exist in nature.Fly ash as a waste product from coal combustion contains silica which can be used to increase the compressivestrength of concrete/mortar. Paving Block as a building material made of mortar composition can be increasedits compressive strength by substituting some cement material with fly ash. Fine aggregate material in the formof sand can also be substituted with natural limestone waste material. In this study, paving blocks were madeusing limestone as a substitute for fine aggregate and fly ash as a cement substitute. The ratio of materials formaking paving blocks is 1: 4. For variations of substitution materials, fly ash is used as a cement substitution.The variation of fly ash is 20% and while the limestone waste is used variations of 0%, 10%, 20%, 30% and 40%.The compressive strength test was carried out at the age of 7 days, 14 days, and 28 days. The results of the studyof compressive strength at the age of 7 days obtained a value of 12.24 MPa at a natural limestone substitutionconcentration of 20.7%. For the age of 14 days the compressive strength value is 15.27 MPa with an optimumconcentration of 20.1% at the concentration of natural limestone, while at the age of 28 days the compressivestrength value is 17.11 MPa, with the optimum concentration of natural limestone material being 20. .15%. Theincrease in compressive strength from the optimum mixture to the normal mixture was 28.93%. Based on SNI 03-0691-1996 the paving blocks produced in this study include Quality B.
Analisis SEM-EDS Beton Normal yang Menggunakan Superplasticizer Yulisya Zuriatni; Muhammad Sofyan; Pratiwi Setyaning Putri; Abdul Rokhman; Irma Wirantina Kustanrika
Borneo Engineering : Jurnal Teknik Sipil Volume 7 Nomor 3 Tahun 2023
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v7i3.4927

Abstract

Beton merupakan bahan bangunan populer yang diakui kekuatan dan daya tahannya. Para peneliti telah mengeksplorasi penggunaan superplasticizer dan gel C-S-H untuk meningkatkan kualitas beton . Superplasticizer adalah bahan tambahan kimia yang dapat ditambahkan ke campuran beton untuk meningkatkan fluiditas sekaligus menjaga kekuatan. Hal ini memudahkan pemasangan dan meningkatkan kemampuan kerja beton. Selain itu, menambahkan gel C-S-H ke beton dapat meningkatkan kinerja jangka panjang dan meminimalkan retak. Formasi gel C-S-H pada kekuatan dan daya tahan beton diselidiki secara cermat dalam studi ini dengan melakukan pengujian foto SEM EDS. Pemindaian Mikroskop Elektron-Spektroskopi Sinar-X Dispersi Energi adalah alat analisis yang kuat untuk menentukan komposisi unsur dan bentuk bahan berskala nano. Ini menyelidiki permukaan material dengan berkas elektron terfokus dan menghasilkan sinyal yang dapat digunakan untuk mengidentifikasi dan memetakan distribusi komponen yang ada. Hasil Uji SEM-EDS menunjukkan Unsur senyawa Ca, Al dan Si mendominasi. Rasio Oksida SiO2/CaO yang tinggi pada sampel cenderung memiliki kuat tekan yang lebih tinggi. Sebaliknya, material dengan rasio SiO2/CaO yang lebih rendah menunjukkan kuat tekan yang lebih rendah.
Co-Authors Desi Putri Dhani Van Chairi Dyah Pratiwi Kusumastuti Gita Puspa Artiani Hazriani, Hazriani Herlinah Herlinah Indah Handayasari Irlan, Ade Okvianti Jansen Zadrak Korobu kustanrika, irma wirantina Muhammad Sofyan Nur, Adnan Pratiwi Setyaning Putri RR.Mekar Ageng Kinasti Shevina Halusman Sriyono D. Siswoyo Yulisya Zuriatni