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POROSITAS BETON HIGH VOLUME FLY ASH (HVFA) DI AIR GAMBUT Nursuci, Ika Qoriah; Ismeddiyanto, Ismeddiyanto; Olivia, Monita
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

This study aims to examine the porosity of concrete with the use of fly ash as a substitute for a large portion of cement (HVFA). Ordinary Portland Cement (OPC) specimen is used as a control of HVFA concrete. The content of pozzolanic material in HVFA concrete is 45% of fly ash. Fly Ash (FA) contained in HVFA concrete in this study had a variation of 50% by weight of cement. After the concrete was released from the mold, OPC and HVFA concrete was cured by soaking it normal water for 28 days. Then, the specimen is was removed and soaked again in peat water for ages 7 and 28 days. When concrete reached their respective ages, porosity testing was carried out on concrete. The results shared that the porosity of OPC immensed in peat water was 17.35% higher than that of immensed in normal water. The increase of porosity on OPC specimen was do the attack of acid contained in peat water which made the specimen became porous and increased its porosity value. On the other hand, HVFA specimen was more resistant to peat water. This was indicated by a decrease in the porosity value of 19.83%. HVFA specimen contained large amounts of FA, the pozzolanic FA makes concrete more resistant to the peat environment and neutralizes the impact of peat on specimen. Keywords: Porosity, fly ash (fly ash), HVFA, peat water.
EDUKASI PORTABLE AND ECO-FRIENDLY OF GABION (POLYGON) KOMBINASI CANGKANG KERANG DAN BATU SEBAGAI PENGENDALI EROSI SUNGAI [PORTABLE AND ECO-FRIENDLY OF GABION (POLYGON) EDUCATION, THE COMBINATION OF SHELLFISH AND STONE FOR CONTROL RIVER EROSION] Wijaya, Miguel Felix; Rizaldi, Niko; Miranda, Maharani; Surya, Harpian; Yanuari, Ramadhan; Olivia, Monita
Jurnal Sinergitas PKM & CSR Vol 3, No 1 (2018): JURNAL SINERGITAS PkM & CSR
Publisher : Universitas Pelita Harapan

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Abstract

Uncontrolled erosion will endanger the people on the banks of the river. One of the bad consequences is the land down and the landslides, as happened in the Lubuk Lande River, Teratak Buluh Village. This river is located on the edge of Lubuk Street, initially the Lubuk road has a width of 3.5 m, the road gradually narrows to 3 m wide. Therefore, Community Service (PKM) activities are needed, in order to develop knowledge, skills, optimize natural resources and waste by making portable and eco-friendly of Gabion (polygon). Polygon is an innovation of making gabion using waste shellfish, river stones and vetiver plants as a controller of river erosion. Polygon is designed with a beam shape with 3 frames, the first frame is filled with river stone material, the second frame is filled with a mixture of stone and shells, and the third frame is filled with shellfishs and vetiver plants. polygon is placed on the side of the river which often experiences erosion, namely the river turn area. This PKM activity was carried out for two days with the community and cadres. The first day was an educational activity, while the second day was the implementation of polygon. The results of this activity indicate an increase in community knowledge and contributions about controlling river erosion.Keywords: river erosion, polygon, shellfish, stone, vetiver
Karakteristik Mortar Dengan Campuran Abu Kerang Lokan Dalam Rendaman NaCl Syafpoetri, Nelvia Adi; Djauhari, Zulfikar; Olivia, Monita
Jurnal Rekayasa Sipil Vol 14, No 1 (2018)
Publisher : Civil Engineering Departement, Andalas University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrs.14.1.63-72.2018

Abstract

Kulit kerang merupakan bahan yang dapat digunakan sebagai bahan pengganti agregat kasar, pengganti pasir, filler, dan sebagai bahan pengganti semen. Kandungan CaO dari kulit kerang berpotensi untuk meningkatkan kekuatan beton dan memperbaiki sifat-sifat beton. Pada penelitian ini abu dari kulit kerang lokan digunakan sebagai bahan tambah atau filler pada mortar dalam rendaman NaCl. Kulit kerang lokan dibakar, dihaluskan dan disaring menggunakan saringan no.200 untuk mendapatkan ukuran partikel yang halus sehingga dapat memberikan reaksi pozzolanik yang lebih baik dan lebih mudah untuk mengisi pori pada pasta semen. Variasi penggunaan abu kulit kerang lokan sebagai bahan tambah atau filler adalah 0%, 5%, dan 10%. Proses perawatan benda uji adalah 28 hari perendaman air biasa dan dilanjutkan dengan perendaman dalam larutan NaCl. Tahap pengujian yaitu pengujian kuat tekan, pengujian porositas, dan perubahan berat. Hasil pengujian menunjukkan bahwa penambahan abu kulit kerang lokan dapat meningkatkan kekuatan beton dan kinerja beton. Mortar dengan penambahan abu kulit kerang lokan sebanyak 5% dan 10% memiliki kekuatan tekan yang  tinggi, porositas rendah dan perubahan berat kecil dibandingkan mortar 0%. Diperoleh nilai optimum dari mortar dengan penambahan abu kulit kerang lokan sebanyak 5% dalam rendaman NaCl.
Kuat Tekan Dan Ultasonic Pulse Velocity (UPV) Beton OPC Dan OPC Abu Sekam Padi Untuk Aplikasi Di Lingkungan Gambut Setyawan, Muhammad Farhan; Sitompul, Iskandar Romey; Olivia, Monita
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

This research study the compressive strength and ultrasonic pulse velocity (UPV) of OPC and OPC rice husk ash (RHA) concrete. Test will be measured after 28 days immersed in peat water. Specimens will be immersed in peat water after 28 days cured in normal water. Compressive strength of OPC concrete showed biggest value than OPC with admixture RHA 5% and 10% which is increasing amount of RHA for subsitute cement will decreasing compressive strength. Test UPV of the specimen showed OPC RHA 5% being best quality than other.Keywords: Durabilty, OPC, RHA, peat environment.
Porositas Dan Sorptivity Beton OPC Dan Beton OPC POFA Dengan Perbaikan Air Gambut Sebagai Air Pencampur Menggunakan Kapur Tohor Di Lingkungan Gambut Sormin, Lina S; Olivia, Monita; Syaputra, Edy
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The use of peat water is often used as concrete mixing water in areas difficult to obtain clean water. Peat water containing a low pH is not recommended as concrete mixing water because it can reduce the quality of concrete. Mineral materials such as Palm Oil Fuel Ash (POFA) used in the concrete mix to increase the density of the resulting. This study aims to assess the physical properties such as porosity and water sorptivity concrete using peat as concrete mixing water. Type of cement used in the concrete mixture is OPC and OPC POFA 10%. Peat water for the research came from Rimbo Panjang, Kampar, Riau and POFA derived from Perhentian Raja, Kampar, Riau. Research results show that concrete repair using quicklime 40 milligrams for peat water soaked peat environment has a high porosity and sorptivity.Keywords: OPC, Palm Oil Fuel Ash (POFA), peat water, quicklime
Kuat Tekan Paving Block Geopolimer Abu Sawit (Palm Oil Fuel Ash) Dengan Perawatan Suhu Ruang Syarif, Harriad Akbar; Olivia, Monita; Saputra, Edy
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Geopolymer is an environmentally friendly alternative construction material made from the process of activating the base material rich in silicon (Si) and aluminum (Al) with a solutionof alkaline activators. In this study, using the ashes of oil derived from Dumai, Riau Province as the base material of geopolymer. With the eco-friendly construction material that theproduct is made with reference to a standard paving blocks. This study is based on variations of modulus activator, dosage activators, and the addition of cement type 1 (OrdinaryPortland Cement) for the treatment of room temperature (setting time) on the composition of the mixture. This study aims to determine the amount of use of the base material (palm oil fuelash) from the comparison alkaline activator with palm oil fuel ash used in paving block geopolymer based treatment time and its influence on the physical properties of the geopolymer paving block. The results showed that the strong increase in modulus of paving blocks are influenced by activators in combination with the addition of cement to each composition.Keywords: palm oil fuel ash, geopolymer, paving block, modulus activator, dosage activator
KUAT TEKAN DAN KUAT LENTUR BETON GEOPOLIMER ABU TERBANG HYBRID DENGAN PECAMPURAN PORTLAND COMPOSITE CEMENT Noviandri, Rizky; Olivia, Monita; Sitompul, Iskandar Romey
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The use of Portland Composite Cement (PCC) as a substitute material in fly ash geopolymer hybrid concrete will accelerate the geopolymer reaction since the geopolymer becomes more reactive. In this study, the fly ash geopolymer hybrid concrete used 12 M NaOH concentration, modulus of silicate (Ms) 2.5 and 15% PCC cement, and extra water 80 kg/m3. Geopolymer hybrid concrete treatment were carried out at room temperature. Tests carried out were compressive strength and flexural strength at 7 and 28 days. The results showed the compressive strength of geopolymer hybrid concrete against PCC concrete had a decreasing percentage of difference from 34,54% (6,68 MPa) at 7 days to 20,01% (4,49 MPa) at 28 days. Then, the percentage of flexural strength difference decreased from 31.09% (1.25 MPa) at seven days to 28.55% (1.39 MPa) at 28 days. It was concluded that fly ash did not significantly affect the split tensile strength of geopolymer hybrid concrete 28 at days.The results showed that the compressive strength and flexural strength of the geopolymer hybrid concrete were lower than these of PCC concrete.Keywords : Mechanical properties, hybrid geopolymer concrete, PCC, room temperature.
KUAT TEKAN MORTAR OPC ABU SEKAM PADI PADA SUHU TINGGI Afrian, Mirza; Olivia, Monita; Djauhari, Zulfikar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

This research examines the partial replacement of cement mortar with the OPC by rice husk ash as a binding material. Rice husk Ash (RHA) has used silica content of 90%. Compressive strength was tests are carried out on the basis of the percentage of rice husk ash and its time variations of the treatment. Variation of rice husk ash used is 10%, 15%, and 20%. Samples was curing in water for 28 days before furnace with variations of temperature 250°C, 500°C, and 750°C for 3 hours. This research showed that a mixture of mortar with the replacement of the 15% rice husk ash cement against the OPC provides optimum results against compressive strength value, not only on the maintenance of room temperature but also at 250°C and 500°C. Compressive strength of all types of cement has increased at temperature of 250. The higher the replacement of cement by rice husk ash will weaken the compressive strength of mortar, but spalling and cracking doesn't happen on every OPC cement replacement by RHA.Keywords: Cracking, high temperature, OPC, rice husk ash, spalling,
Durabilitas Beton Bubuk Kulit Kerang Di Lingkungan Air Laut Tarisa, Elen; Olivia, Monita; Kamaldi, Alfian
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

In this study,blood clam used as cement replacement material. The specimens were cured in distilled water until 28 days. Then specimens were immersed in sodium chloride solution until 91 days. The parameters studied include compressive strength, workability, and density. These properties were compared with those of a control concrete that was made of Ordinary Portland Cement (OPC). The main parameter of this study was the proportion of waste blood clam (4% by cement weight).Keywords: blood clam, cement replacement, sodium chloride solution, compressive strength, workability, density
Nilai Slump, Porositas Dan Kuat Tekan Beton OPC Dan OPC RHA Untuk Aplikasi Di Lingkungan Gambut Alfadh, Mhd Raja; Kamaldi, Alfian; Olivia, Monita
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The aggressive environment, especially the peat environment contains many chemicals that can unravel the elements in the concrete, causing damage to the concrete. This study examines the strength and physical properties of OPC (Ordinary Portland Cement) concrete and OPC RHA (Rice Husk Ash) concrete exposed in peat environments. RHA as one of pozzolan with high silica is used as a replacement of cement with the substitution of 5% and 10%. This concrete are tested mechanically and physically such as compressive strength and porosity tests after soaking in peat canals for 28 days, in addition to fresh concrete tests such as workability. The concrete strength of the planned concrete is K-250. The peat water used as a test immersion medium has a pH of 3.5-4.5. The results of fresh concrete testing show that the addition of RHA makes the workability decreases. The lowest workability was obtained from a mix containing 10% RHA. The OPC concrete has the highest compressive strength of 20,28 MPa. Porosity of OPC RHA concrete decreased with increase in curing time. The lowest porosity is shown by OPC RHA 10% concrete. Based on the results of the test, it is concluded that the replacement of cement by RHA, has a positive effect on all physical properties of concrete.Keywords: Peat Environtment, OPC, RHA, Compressive strength, Physical Properties