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Setia Romadhon, Eri
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Design of Low Alkali Activator Geopolymer Concrete Mixtures Setia Romadhon, Eri; Antonius, Antonius; Sumirin, Sumirin
ASTONJADRO Vol. 11 No. 3 (2022): ASTONJADRO
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/astonjadro.v11i3.7484

Abstract

This paper presents the results of research on the design of geopolymer concrete mixes. The main objective of this research is to develop an efficient and easy design of low-alkaline activator geopolymer concrete mixture, which until now has been the biggest obstacle in the use of geopolymer concrete. The variables reviewed were the amount of alkaline activator was quite low at 4%, room temperature and 60oC ratio of alkaline activator/fly ash (AAS/FA) were 0.35, 0.4, 0.5, 0.6. The test results show the parameters of geopolymer concrete with low alkali activator 4%, sodium silicate/sodium hydroxide ratio 2.5%, sodium hydroxide molarity 14M, type F fly ash and the discovery of the relationship model of compressive strength and the ratio of alkali activator/fly ash with a very high correlation as basic development of geopolymer concrete mix design. The design of the geopolymer concrete mix developed is easy because it is application-based and efficient because it only requires 4% alkaline activator.
ANALISA EFEKTIFITAS GROUTING MAINDAM DAN TUNNEL WATERWAY BENDUNGAN KEUREUTO KABUPATEN ACEH UTARA Wahyu, Wili; Setia Romadhon, Eri
JURNAL TEKNIK SIPIL-ARSITEKTUR Vol. 23 No. 1 (2024): EDISI BULAN MEI 2024
Publisher : FTSP Universitas Jayabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54564/jtsa.v23i1.169

Abstract

Bendungan Keureuto di Kabupaten Aceh Utara yang telah dibangun sejak tahun 2015 sampai dengan saat ini termasuk salah satu bendungan di Indonesia yang memiliki karakteristik pondasi yang unik, dengan jenis batuan pada pondasi didominasi oleh batuan jenis mudstone. Menurut Sosrodarsono, dkk (1997), bahan material untuk pembangunan bendungan urugan diambil dari hasil galian sekitar site sebagai kedudukan bendungan atau lokasi bendungan pelengkap. Namun hasil galian sekitar site Bendungan Keureuto yang teridentifikasi didominasi oleh jenis batuan mudstone memiliki kekerasan dan kekakuan yang kurang baik dan sangat rentan mengalami pelapukan apabila terekspos oleh udara dan air secara terus menerus. Untuk meningkatkan daya dukung pondasi tubuh bendungan yang memiliki batuan dasar jenis mudstone tersebut maka dilakukan perkuatan pondasi dengan menggunakan grouting di sepanjang as maindam dan Tunnel Waterway Bendungan Keureuto. Perkuatan Pondasi yang dilakukan dengan metode grouting tersebut diharapkan dapat meningkatkan nilai Lugeon (LU) menjadi <5 pada setiap blok groutiing yang ditentukan, dari nilai lugeon sebelumnya yang cukup besar dan tidak memenuhi syarat sebagai pondasi bendungan.
ANALISIS UJI TEKAN BETON DENGAN BUBUK KARBON SEKAM SEBAGAI BAHAN SUBSTITUSI SEMEN Prihanto, Amalyan; Setia Romadhon, Eri
JURNAL TEKNIK SIPIL-ARSITEKTUR Vol. 23 No. 1 (2024): EDISI BULAN MEI 2024
Publisher : FTSP Universitas Jayabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54564/jtsa.v23i1.172

Abstract

In making concrete, local materials can be utilized so that the cost of making concrete is relatively cheap, in this study used carbon husk powder as a partial substitution material of cement in a concrete mixture and is expected to improve the quality of concrete and also environmentally friendly, the content of the carbon husk powder used namely 0%, 5%, 10%, 15% and 20% of the amount of cement used. The specimens were made with a composition of a mixture of 1 cement: 2 sand: 3 gravel, for the manufacture of normal concrete and the addition of carbon husk powder for the manufacture of concrete with a mixture of carbon husk powder with K-300 concrete quality. From the results of the study obtained the value of water use by using carbon husk powder increased in accordance with an increase in the composition of the carbon husk powder used, namely 0% (6.82), 5% (6.92), 10% (7.52), 15% ( 7,62) and 20% (8,82). The compressive strength of concrete using carbon husk powder at a composition of 5% shows that the average compressive strength of concrete is higher than normal concrete, which is 330,161 kg / cm2 (at 14 days), and lower 325,267 kg / cm2 (at 21 days) the compressive strength value of concrete continues to decrease with the addition of carbon husk powder composition as a cement substitution material at a composition of 10% (246,726 kg / cm2), 15% (226,513 kg / cm2) and 20% (166,350 kg / cm2) at 14 days and 10 % (268,027 kg / cm2), 15% (226,573 kg / cm2) and 20% (172,657 kg / cm2) at the age of 21 days.
RANCANG CAMPURAN BETON MUTU TINGGI DENGAN PENAMBAHAN ADMIXTURE HIGH-SUPERPLASTISIZER DAN RETARDER PADA PROYEK TAMAN ANGGREK RESIDENCE Rahmawati, Siti; Setia Romadhon, Eri
JURNAL TEKNIK SIPIL-ARSITEKTUR Vol. 23 No. 1 (2024): EDISI BULAN MEI 2024
Publisher : FTSP Universitas Jayabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54564/jtsa.v23i1.173

Abstract

The role of High-Superplasticizer and Retarder is very dominant on the texture and ease of workmanship of high-quality concrete that we expect. High temperatures throughout the concrete journey to the casting site and fast concrete bonding times are the things that are greatly avoided, so the use of certain doses of retarders is a solution to slow the binding time of the concrete itself. Therefore the use of High-Superplasticizer and Retarder needs to be combined well in order to optimize high-quality concrete in terms of workability. In the Taman Anggrek Residence apartment development project, starting from the inspection of aggregate properties then the calculation for the combination of each aggregate is carried out in accordance with the required specifications. The design of the mixture in this study is the Erntroy-Shacklock method with the properties of the material used are as follows; coarse aggregate with a maximum size of 12.5 mm, admixture with trademarks Viscocrete-1003 (High-Superplasisizer) and Plastiment-P121R (Retarder). Testing of concrete compressive strength was carried out at 7, 14 and 28 days. The results showed that at 7 days the average compressive strength was 37,715 MPa (75.43%), 14 days 45,894 MPa (91,788%), 28 days 58.38 MPa (116.76%).
Co-Authors Antonius Antonius Prihanto, Amalyan Siti Rahmawati Sumirin Sumirin Wahyu, Wili