Ji Hoi Heo and  Jun Seong Park and  Hyo Kim,  Effect of Sodium Aluminate on Compressive Strength of Geopolymer at Elevated Temperatures.   journal   = {International Journal of Urban and Civil Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2019, vol. 153(9). 618 - 624
    [viewed 21 November 2019]. Available from: https://publications.waset.org/pdf/10010780.