Roles of Calcium in Geopolymer Containing Paper Mill Sludge Ash

Abstract:

High amount of calcium oxide (CaO) in source material is known to positively influence the mechanical strength of fly ash based geopolymer. This study was conducted to investigate the suitability of paper mill sludge ash (PMSA) to partially replace fly ash in geopolymer mortar based on its degree of reaction. Fly ash was activated by a combination of sodium silicate solution and 6 M sodium hydroxide solution. The mixtures were designed to replace fly ash content with PMSA at 5%, 10% and 15% (by weight of fly ash). To observe its effect on the mechanical strength, the specimens were cured in three different temperatures, which are 30°C, 60°C and 90°C for 24 hours. After 24 hours, the hardened specimens were demoulded and placed at room temperature until the testing days. Measurement on fresh geopolymer properties was conducted with setting time and flowability tests, while degree of reaction tests was conducted on the hardened specimen. Based on the results, 5% PMSA demonstrated superior degree of reaction than other mixtures, particularly at higher curing temperature.

• Periodical: Materials Science Forum (Volume 917)
• Pages: 311-315
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.917.311
• Online since: March 2018
• Authors: Norbaizurah Rahman, Andri Kusbiantoro*, Nabilah Mamat, Khairunisa Muthusamy, Mohd Mustafa Al Bakri Abdullah
• Keywords: Curing Temperature, Degree of Reaction, Geopolymer, Paper Mill Sludge Ash, Strength

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