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All Journal Borneo Engineering : Jurnal Teknik Sipil Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan Jurnal Kacapuri : Jurnal Keilmuan Teknik Sipil Warta LPM
Ritnawati Makbul
Program Studi Magister Rekayasa Infrastruktur Dan Lingkungan, Universitas Fajar Makassar
Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Materials Science & Nanotechnology Social Sciences

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Efek Curing Air Laut Terhadap Kuat Tekan Beton Mutu Tinggi Yang Menggunakan Fly Ash Sebagai Subtitusi Pasir Azhari Zahlim; Erniati Bachtiar; Ritnawati Makbul
Borneo Engineering : Jurnal Teknik Sipil Volume 6 Nomor 1 Tahun 2022
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/be.v1i1.2161

Abstract

Fly ash waste accumulates from year to year at PLTU in South Sulawesi. The potential of fly ash as an environmentally friendly material to be used as a cement substitute is significant, either partially or entirely. This research aims to analyze the corelation between fly ash substitution as sand substitution and the compressive strength of high-strength concrete treated in seawater and freshwater. Researchers made samples of high-strength concrete with variations in the percentage of fly ash and variations in treatment. Variations in the percentage of fly ash as substitution of sand are 0%, 10%, 20%, and 30%, and variations in curing using fresh water and seawater. Sample treatment was carried out for up to 28 days, after which the compressive strength test according to the Indonesian National Standard (SNI) was carried out. The study results show that the relationship between fly ash substitution and a sand substitution on the compressive strength has a significant correlation. The higher the percentage of fly ash, the higher the compressive strength of the concrete, both fresh and seawater curing. Besides that, the compressive strength of high-strength concrete with freshwater curing treatment is greater than the seawater curing treatment.
Workability dan Sifat Mekanik Self Compacting Geopolimer Concrete (SCGC) Rita Hardianti Aris; Erniati Bachtiar; Ritnawati Makbul
Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan Vol 6, No 2 (2021): September
Publisher : Litbang Pemas - Universitas Islam Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30736/cvl.v6i2.718

Abstract

The purpose of this study was to investigate the relationship between molarity and workability in Self-Compacting Geopolymer Concrete (SCGC), as well as mechanical properties. Compressive strength and split tensile strength tests are used to characterize the mechanical characteristics in this research. Additionally, the study investigates the optimal molarity for self-compacting geopolymer concrete. Fly ash was used in lieu of cement in this research. On new concrete self-compacting geopolymer, workability is determined using the EFNARC standard, which includes the Slump Flow, V-Funnel, and L-Box tests. ASTM 39/C 39M-99 standard is used to determine the compressive strength of self-compacting concrete geopolymer. On new concrete, workability is determined using the EFNARC standard, which comprises the Slump Flow Test, a V-funnel, and an L-Box. The compressive strength of concrete samples is determined according to the ASTM 39/C 39M – 99 standard. The SNI 03-2491-2002 standard is used to determine the split tensile strength of concrete. At the ages of 7, 14, and 28 days, tests were conducted. The findings indicated that new concrete at 11M-13M satisfied the criteria for SCGC workability. The compressive and split tensile strengths of SCGC grow as the concrete ages. In self-compacting geopolymer concrete, the optimal molarity is 13 M.
PEMANFAATAN DAUR ULANG LIMBAH PLASTIK POLYETHYLENE TEREPHTHALATE (PET) SEBAGAI PENGGANTI AGREGAT KASAR PADA BETON Asrar Asrar; Erniati Bachtiar; Sri Gusty; Fatmawati Rachim; Ritnawati Ritnawati; Arman Setiawan
Jurnal Kacapuri : Jurnal keilmuan Teknik Sipil Vol 3, No 2 (2020): JURNAL KACAPURI : JURNAL KEILMUAN TEKNIK SIPIL (Edisi Desember 2020)
Publisher : Universitas Islam Kalimantan Muhammad Arsyad Al-Banjari Banjarmasin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31602/jk.v3i2.4076

Abstract

Sekarang ini material konstruksi beton diarahkan bersifat berkelanjutan dan ramah lingkungan. Banyaknya limbah plastik yang tidak terpakai dan merusak lingkungan. Daur ulang limbah plastik menjadi agregat merupakan salah satu upaya dalam membuat material yang ramah lingkungan. Tujuan penelitian ini adalah untuk mengetahui pengaruh agregat limbah plastik PET (Polyethylene Terephthalate) sebagai pengganti agregat kasar terhadap sifat fisik (slump test, bleeding, segregation, berat isi) dan sifat mekanik kuat tekan beton. Variasi penelitian menggunakan   variasi persentase agregat limbah plastik PET (Poyethylene Terephthalate) pada campuran beton sebesar 0%, 25%, 50%,75% dan 100% terhadap volume agregat kasar pada campuran beton. Penambahan persentase agregat limbah plastik PET (Poyethylene Terephthalate) berpengaruh sangat signifikan pada nilai kuat tekan beton, semakin tinggi persentase agregat limbah plasti PET (Poyethylene Terephthalate) maka semakin rendah nilai kuat tekan beton. Menurunnya nilai berat isi, kuat tekan sangat dipengaruhi oleh bertambahnya persentase agregat limbah plastik PET (Poyethylene Terephthalate) pada beton. Kata Kunci: Poyethylene Terephthalate, Beton, Agregat Kasar, Kuat Tekan, Workability
Analisis Mutu Air Berdasarkan Indeks Pencemaran pada Outlet Limbah Cair Pasar Terong Kota Makassar Ritnawati Makbul; Natsar Desi; Ismail Marzuki
Warta LPM WARTA LPM, Vol. 25, 2022: Special Issue
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (819.853 KB)

Abstract

Penelitian ini bertujuan untuk mengkaji kualitas air outlet Pasar Terong Kota Makassar dari aktivitas perdagangan dan kantor Pasar Terong Kota Makassar berdasarkan parameter Indeks Kualitas Air (IKA). Pengambilan sampel dilakukan di tiga titik dengan 3 kali ulangan dalam interval waktu satu bulan dengan metode contoh sesaat (Grab Sample) atau pengambilan sampel air yang mempunyai karakteristik air tidak berubah dan mewakili keadaan waktu dan tempat tersebut. Kualitas air dianalisis secara deskriptif berdasarkan acuan Baku Mutu Air. Hasil uji laboratorium menunjukkan bahwa kualitas air pada outlet Pasar Terong Kota Makassar melebihi Baku Mutu Air Kelas II berdasarkan Peraturan Pemerintah Nomor 82 Tahun 2001 dengan parameter antara lain TSS (106.72 mg/l), BOD (52.05 mg/l), COD (132.95 mg/l), pH (7.18), Salinitas (33 mg/l) dan Suhu (31.80C). Hasil penelitian dapat disimpulkan bahwa kondisi kualitas limbah cair Pasar Terong Kota Makassar berada pada status tercemar sedang. Limbah cair Pasar Terong Kota Makassar dihasilkan dari pasar tradisional berasal dari bermacam-macam aktivitas, baik itu dari kegiatan perdagangan, perkantoran, kamar mandi dan kios makanan. Demi meningkatkan kualitas limbah yang sesuai dengan baku mutu yang diperbolehkan dalam arti parameter limbah cair Pasar Terong Kota Makassar tidak melebihi baku mutu yang ditentukan, diharapkan Pasar Terong Kota Makassar terdapat pengolahan atau instalasi pengolahan air limbah (IPAL) ataupun sistem yang digunakan dalam penanganan limbah cair Pasar Terong Kota Makassar di masa mendatang.
Co-Authors Arman Setiawan Asrar Asrar Azhari Zahlim Erniati Bachtiar Fatmawati Rachim Ismail Marzuki Natsar Desi Rita Hardianti Aris Sri Gusty