Development of Volcanic Mud-Based Geopolymer Aggregate

Hardjito, Djwantoro and Antoni, and SURYAWANGI, ERWIN and TAKARENDEHANG, YOHANES (2013) Development of Volcanic Mud-Based Geopolymer Aggregate. In: The Sixth Civil Engineering Conference in Asia Region (CECAR6), 20-08-2013 - 22-08-2013, Jakarta - Indonesia.

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Abstract

Several attempts have been made to utilize volcanic mud from Sidoarjo, East Java, Indonesia, which has been erupting since May 2006. More than 600 hectares of productive land, housing and industrial areas, as well as infrastructures have been submerged. To date, after more than six years, there is no sign that the eruption will end in the near future. The contents of mud are predominantly SiO2, Al2O3 and Fe2O3 in crystalline form. This paper reports an attempt to utilize the volcanic mud as artificial aggregate through geopolymerisation process. After pre-treatment in the form of calcinations and grinding, the volcanic mud is found to be reactive. Geopolymerisation is performed by mixing the more-amorphous form of the volcanic mud with the highly alkaline solution, followed by curing in an elevated temperature. The artificial aggregates resulted from this process is found to remain stable after 24 hours immersing in the water. The specific gravity of the artificial aggregates varies widely in between 1470-1800 kg/m3, depending on the mixture composition, which can be attributed as lightweight aggregate. This study reveals the potential of volcanic mud from Sidoarjo, East Java, Indonesia, to be used as artificial aggregates, although further improvement in its characteristics needs to be carried out.

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