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One Part Method for Making Geopolymer Paste using Flocculated Sidoarjo Mud

Syihabuddin Thilal, Ekaputri Januarti Jaya, Maulana Mahendra A., Soemitro Ria Asih Aryani, Petrus Himawan Tri Bayu Murti, Chikako Fujiyama

Archives of Metallurgy and Materials

2024

Vol. 69, iss. 4

1401--1406

Some efforts have proposed the utilization of Sidoarjo mud for geopolymer paste. However, the original dry mud in geopolymer concrete showed decreased compressive strength and increased required water. In this paper, the one-part method is proposed to reduce the water in the mixture. First, the mud was chemically flocculated. Then, the dry mud was mixed with fly ash, activated geothermal silicate, and sodium hydroxide mixture in solid form before then the distilled water was added. This reduced the required water to 50% compared to the two-part method. The flocculant sedimented heavy metal that resulted in higher compressive strength at a later age. At 28 days, dry flocculated mud showed higher compressive strength than the original dry mud, with a compressive strength of 13 MPa and 11 MPa, respectively. This is because of the increase of silica, alumina, and iron content from 70% in dry LUSI to 75% in dry flocculated mud.