Optimization of NaOH Molarity, LUSI Mud/Alkaline Activator, and Na2SiO3/NaOH Ratio to Produce Lightweight Aggregate-Based Geopolymer

International Journal of Molecular Sciences

Rafiza Abdul Razak²  Mohd Mustafa Al Bakri Abdullah¹  Kamarudin Hussin¹  Khairul Nizar Ismail⁴  Djwantoro Hardjito³  Zarina Yahya² 

[1] Faculty of Engineering Technology, Uniciti Alam Campus, Universiti Malaysia Perlis, Sungai Chuchuh, 02100 Padang Besar, Perlis, Malaysia; E-Mail:;Centre of Excellence Geopolymer & Green Technology (CEGeoGTech), School of Material Engineering, Universiti Malaysia Perlis (UniMAP), P.O. Box 77, D/A Pejabat Pos Besar, 01000 Kangar, Perlis, Malaysia; E-Mail:;Civil Engineering Department, Petra Christian University, Jalan Siwalankerto 121-131, Surabaya 60236, Indonesia; E-Mail:;School of Environmental Engineering, Universiti Malaysia Perlis, 01000 Jejawi, Perlis, Malaysia; E-Mail:

关键词: artificial lightweight aggregate;    geopolymer;    aggregate impact value;    SEM;    X-ray Diffraction (XRD);    Fourier Transform Infrared (FTIR);   

DOI  :  10.3390/ijms160511629

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.