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Journal : BANGUN REKAPRIMA

OPTIMALISASI PEMANFAATAN LIMBAH PECAHAN BATA UNTUK MENINGKATKAN KETERAMPILAN BATU DI KELURAHAN NGADIRGO KOTA SEMARANG Wicaksono, Teguh Mulyo; Wasino, Wasino; Mukhlisin, Muhammad; Supriyadi, Supriyadi; Sudarmono, Sudarmono; Junaidi, Junaidi; Sukoyo, Sukoyo; Suwarno, Anung; Mahmudi, Wildana Latif; Abdillah, Rifqi Aulia
Bangun Rekaprima Vol. 10 No. 1 (2024): April 2024
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/bangunrekaprima.v10i1.5467

Abstract

2022 is the beginning of offline learning after the Covid-19 pandemic. where previously learning was carried out online including practicums. One of the practicums carried out in the Semarang State Polytechnic Civil Engineering department is the masonry practicum which is carried out for semester 1 students. With the offline masonry practicum, the practicum will leave behind brick fragments that can no longer be used. These broken bricks will usually be thrown away at the end of each semester after all the practicums have been carried out. the proportion of brick fragments to intact bricks usually reaches 30% to 40%. The construction workers come from the Ngadirgo community, they learn building work autodidactically based on experience. With the continued development of BSB, there are quite a lot of employment opportunities, including development workers. Techniques and methods of masonry work that comply with construction standards can increase the ability of craftsmen to become skilled workers so that it is hoped that they can improve the welfare of the community around Ngadirgo sub-district, Mijen sub-district. Ngadirgo sub-district currently has a village cemetery which is located in Ngadirgo hamlet RW 2, in this cemetery there is no coffin house which is used to store death equipment including the coffin which is currently still entrusted to one of the residents' house. With the existence of coffin house products made from brick masonry in the village cemetery area.
OPTIMALISASI PEMANFAATAN LIMBAH ABUTA (ABU SEKAM PADI, DAN SERBUK BATA) SEBAGAI SUBTITUSI SEMEN PADA CAMPURAN BETON RAMAH LINGKUNGAN Wicaksono, Teguh Mulyo; Mukhlisin, Muhammad; Fatmawati, Leily; Rahmawati, Roselina; Supriyadi, Supriyadi; Sukoyo, Sukoyo; Sudarmono, Sudarmono; Herlambang, Fajar Surya; Anastasya, Frida
Bangun Rekaprima Vol. 10 No. 1 (2024): April 2024
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/bangunrekaprima.v10i1.5681

Abstract

Construction prioritizes the strength of concrete without thinking about the negative impact on the environment. The cement industry is estimated to contribute 5-7% of CO2 gas emissions in the world. On the other hand, Indonesia is also faced with environmental problems caused by various industrial waste. From this problem an innovation emerged, namely ABUTA (husk ash and brick ash). The aim of this innovation is to create a concrete innovation using Abuta Waste (Rice Husk Ash, and Brick Powder). For the manufacture of economical, environmentally friendly concrete to reduce the negative impacts caused by excessive use of cement and reduce industrial waste in Indonesia. In writing this proposal the author used the experimental writing method and data collection method. The concrete innovation applied is concrete with a mixture of variations in the composition of rice husk ash powder and red brick powder of 10% of the cement composition in conventional concrete so that it is more economical and environmentally friendly. In this study, the ACI (American Concrete Institute) mix design method was used with the required design quality of 30 MPa. It is hoped that this innovation can become an environmentally friendly concrete innovation to reduce the negative impacts of excessive cement use and reduce industrial waste in Indonesia. Based on the mix design, the proportion of ash mixture (rice husk ash and brick powder) is 1:1. Meanwhile, the ratio of the amount of ash mixture to cement is 10%: 90%. The compressive strength of concrete with a 0% Abuta mix variation (7 days old) was 19.5, while the concrete innovation with a 10% Abuta mix variation (7 days old) was 15.70 Mpa. This means that the 10% mixture reduces the compressive strength value by 46.28% below the 0% abuta mixture variation. Using a mixture of 10% ash (rice husk ash and brick powder) in innovative concrete can reduce production costs by IDR. 76,700/m ³. Based on the materials obtained in this manufacture, it can be concluded that to obtain optimal compressive strength, better quality materials are needed. The application of concrete can be applied in casting work floors and non-structural construction work such as buildings that require general load power such as housing, sculpture, home interiors and others.
ANALISIS POTENSI ADMIXTURE JENIS PLASTISIZER ALAMI SEBAGAI BAHAN TAMBAH BETON TIPE SELF COMPACTING CONCRETE (SCC): ANALISIS POTENSI ADMIXTURE JENIS PLASTISIZER ALAMI SEBAGAI BAHAN TAMBAH BETON TIPE SELF COMPACTING CONCRETE (SCC) Wicaksono, Teguh Mulyo; Mukhlisin, Muhammad; Fatmawati, Leily; Rahmawati, Roselina
Bangun Rekaprima Vol. 11 No. 1 (2025): April 2025
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/bangunrekaprima.v11i1.6550

Abstract

Self-compacting concrete (SCC) is a type of concrete that has the ability to flow and consolidate itself without the need for vibration. The addictive substance for self-compacting concrete uses chemical plasticizers produced by concrete chemical companies. The nature of the plasticizer material is usually liquid and thick which is used to thin the mixture and increase the workability of the concrete. The research began by creating a mix design including preparation of the need for natural additives. Testing the thinness of the concrete mix can be carried out using a flow test or fresh concrete spread test, where SCC meton meets the criteria if it gets a minimum spread test diameter of 50 cm. Some natural materials that are thick in nature include aloe vera sap, egg white, snail mucus and others. Tests using plasticizer fabricated products from Sika Viscocrete 3000 had the highest Flow values ​​for SCC concrete, followed by Sugar Solution, Allovera, Egg White and Snail Liquid. The results of successive cylindrical concrete compression tests produced average strengths ranging from Sika Viscocrete 23.6 Mpa, Allovera 14.23 Mpa, Snail 13.75 Mpa, Egg White 11.0 Mpa, and Sugar 3.1 Mpa. Fabricated plasticizers have very good results as additional materials for Self Compacting Concrete type concrete, while the natural material that still has potential in terms of flow is sugar solution, while in terms of compressive strength it is allovera.