MUHAMMAD AFANDI GUNAWAN, NIM.112021004 (2025) PENGARUH ABU SEKAM PADI SEBAGAI BAHAN SUBTITUSI FLY ASH TERHADAP BERAT JENIS DAN KUAT TEKAN MORTAR GEOPOLIMER. Skripsi thesis, UNIVERSITAS MUHAMMADIYAH PALEMBANG.

Preview	Text 112021004_BAB I_DAFTAR PUSTAKA.PDF.pdf - Published Version Download (1MB) | Preview
	Text 112021004_BAB II.PDF.pdf - Published Version Restricted to Repository staff only Download (403kB)
	Text 112021004_BAB III.PDF.pdf - Published Version Restricted to Repository staff only Download (735kB)
	Text 112021004_BAB IV.PDF.pdf - Published Version Restricted to Repository staff only Download (215kB)
	Text 112021004_BAB V.PDF.pdf - Published Version Restricted to Repository staff only Download (111kB)
	Text 112021_DAFTAR PUSTAKA.PDF.pdf - Published Version Restricted to Repository staff only Download (142kB)
	Text 112021004_LAMPIRAN.PDF.pdf - Published Version Restricted to Repository staff only Download (3MB)
	Text 112021004_Cover_sampai_Lampiran.pdf - Published Version Restricted to Repository staff only Download (5MB)

Abstract

This study aims to evaluate the effect of rice husk ash as a partial in geopolymer mortar, focusing on its impact on density and compressive strength. RHA was selected due to its high silica content and potential as an alternative pozzolanic material. The experiment involved five mix variations with RHA replacing fly ash at 0%, 5%, 10%, 15%, and 20% by mass. Cube specimens measuring 50×50×50 mm were prepared, with a total of 45 samples tested at the ages of 14, 21, and 28 days. The mortar was activated using a 14 M NaOH and Na₂SiO₃ solution at a ratio of 2.5:1, with heat curing at 60°C for 24 hours. The test results indicated that the optimal substitution level was 5%, achieving the highest compressive strength of 43.94 MPa and a density of 2123.5 kg/m³ at 28 days. Substitution levels above 10% led to a significant decline in mechanical performance. This decrease is attributed to the low Al₂O₃ content in RHA, which disrupts the Si/Al ratio balance necessary for geopolymerization, resulting in a less dense and mechanically weaker mortar structure. Based on these findings, a 5% RHA substitution is recommended as the optimal composition for improving geopolymer mortar performance. While RHA demonstrates potential as a partial replacement for fly ash, its usage should be limited to maintain the structural and mechanical integrity of the mortar.

Item Type:	Thesis (Skripsi)
Additional Information:	1. Mira Setiawati, S.T.,M.T. 2. Adji Sutama, S.T.,M.T.
Uncontrolled Keywords:	Keywords: geopolymer mortar, rice husk ash, fly ash, compressive strength, bulk density, pozzolanic material, silica content
Subjects:	Teknik Sipil > Bahan-bahan Bangunan
Divisions:	Fakultas Teknik > Teknik Sipil (S1)
Depositing User:	Mahasiswa Fakultas Teknik
Date Deposited:	06 Sep 2025 01:57
Last Modified:	06 Sep 2025 01:57
URI:	http://repository.um-palembang.ac.id/id/eprint/32900

Actions (login required)

View Item