This paper presents the efforts of how to use the solid form of Sidoarjo mud as a base material of lightweight-geopolymer paste. The mud, which is called Lusi was mixed with a class F fly ash. Some experimental results have shown that mixing mud with fly ash and alkali was potential to become a binder in concrete, instead of Portland cement. Alkaline solutions used in the mixture were NaOH of 12 M and 14 M and Na2SiO3 combined in the ratio of 1:2. 5 by weight. Aluminum powder was applied as a foaming agent. It showed that the strength of paste made with mixing Sidoarjo mud and fly ash was influenced by mud content. The effect of chemical admixture and curing temperature was observed as well. A steam curing method at 60°C was applied to the paste for three and six hours. Test results showed that the compressive strength of the paste varied with the concentration of alkaline solution, mud content, admixture and curing temperature. The maximum strength of the lightweight paste at 21 days was 2. 8 MPa with the density of 722 kg/m3.

Original languageEnglish
Title of host publicationGeopolymer and Green Technology Materials
PublisherTrans Tech Publications Ltd
Number of pages12
ISBN (Print)9783038352334
Publication statusPublished - 2015
Event2014 Malaysia-Indonesia Geopolymer Symposium, MIGS 2014 - Kuala Lumpur, Malaysia
Duration: 11 May 201412 May 2014

Publication series

NameMaterials Science Forum
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752


Conference2014 Malaysia-Indonesia Geopolymer Symposium, MIGS 2014
CityKuala Lumpur


  • Fly ash
  • Geopolymer
  • Lightweight
  • Lusi
  • Sidoarjo mud


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