RULLY NURULITA, NIM. 112018083 (2022) PENGARUH VARIASI MOLARITAS NaOH DAN RASIO ALKALI AKTIVATOR TERHADAP KUAT TEKAN BETON GEOPOLIMER. Skripsi thesis, Universitas Muhammadiyah Palembang.

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Abstract

One of the materials needed in the manufacture of concrete is cement. However, cement production can produce excessive CO2 gas that can damage the earth's atmosphere. Therefore, an environmentally friendly concrete innovation was made, namely geopolymer concrete. The main material for making this concrete is a pozzolanic material which is rich in Silica (SiO3) and Alumina (Al2O3) as a substitute for cement and an alkali activator consisting of Sodium Hydroxide (NaOH) and (Na2SiO3) as a binder in its manufacture. This study aims to determine the best variation that can produce the highest compressive strength. The pozzolanic material used is fly ash type F with a ratio of fly ash and alkali activator that is 74%:26%. The molarity of NaOH used was 10M, 12M, 14M, the ratio of Na2SiO3 and NaOH was 2.5 : 1, 3.0 : 1, 3.5 : 1. The test object used was a cylinder with a size of 15cm x 30cm and the compressive strength test was carried out at the age of 28 days. This study obtained the results of the characteristic compressive strength of geopolymer concrete with the ratio of NaOH and Na2SiO3 of 2.5 : 1 at 10M, 12M, 14M NaOH is 25.81 Mpa, 27.00 Mpa, 28.98 Mpa. The characteristic compressive strength of geopolymer concrete with a NaOH and Na2SiO3 ratio of 3.0 at 10M, 12M, 14M NaOH is 24.32 Mpa, 24.67 Mpa, 26.58 Mpa. In the variation of the Na2SiO3 and NaOH ratio of 3.5 : 1geopolymer concrete has a very low workability so that the variation is very difficult to homogenize. The test results show that the molarity and alkali activator ratio greatly affect the compressive strength and workability of geopolymer concrete. The higher the molarity, the higher the compressive strength value. Meanwhile, the higher the alkali activator ratio, the lower the compressive strength produced.

Item Type:	Thesis (Skripsi)
Additional Information:	Pembimbing 1. Ir. Hj. R. A. Sri Martini, M.T. Pembimbing 2. Mira Setiawati, S.T., M.T
Uncontrolled Keywords:	geopolymer concrete, Molarity, NaOH, Na2SiO3, fly ash, alkali activator, compressive strength.
Subjects:	Teknik Sipil > Bahan-bahan Bangunan
Divisions:	Fakultas Teknik > Teknik Sipil (S1)
Depositing User:	Mahasiswa Fakultas Teknik
Date Deposited:	12 May 2022 00:57
Last Modified:	12 May 2022 00:57
URI:	http://repository.um-palembang.ac.id/id/eprint/20854

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