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- Title
Optimization of NaOH Molarity, LUSI Mud/Alkaline Activator, and Na<sub>2</sub>SiO<sub>3</sub>/NaOH Ratio to Produce Lightweight Aggregate-Based Geopolymer.
- Authors
Razak, Rafiza Abdul; Al Bakri Abdullah, Mohd Mustafa; Hussin, Kamarudin; Ismail, Khairul Nizar; Hardjito, Djwantoro; Yahya, Zarina
- Abstract
This paper presents the mechanical function and characterization of an artificial lightweight geopolymer aggregate (ALGA) using LUSI (Sidoarjo mud) and alkaline activator as source materials. LUSI stands for LU-Lumpur and SI-Sidoarjo, meaning mud from Sidoarjo which erupted near the Banjarpanji-1 exploration well in Sidoarjo, East Java, Indonesia on 27 May 2006. The effect of NaOH molarity, LUSI mud/Alkaline activator (LM/AA) ratio, and Na2SiO3/NaOH ratio to the ALGA are investigated at a sintering temperature of 950 °C. The results show that the optimum NaOH molarity found in this study is 12 M due to the highest strength (lowest AIV value) of 15.79% with lower water absorption and specific gravity. The optimum LUSI mud/Alkaline activator (LM/AA) ratio of 1.7 and the Na2SiO3/NaOH ratio of 0.4 gives the highest strength with AIV value of 15.42% with specific gravity of 1.10 g/cm³ and water absorption of 4.7%. The major synthesized crystalline phases were identified as sodalite, quartz and albite. Scanning Electron Microscope (SEM) image showed more complete geopolymer matrix which contributes to highest strength of ALGA produced.
- Subjects
SIDOARJO (Indonesia); POLYMER aggregates; SODIUM hydroxide; SOLUBLE glass; ALKALINE solutions; LIGHTWEIGHT materials; SCANNING electron microscopes; MUD
- Publication
International Journal of Molecular Sciences, 2015, Vol 16, Issue 5, p11629
- ISSN
1661-6596
- Publication type
Article
- DOI
10.3390/ijms160511629