Nowadays, lightweight construction materials are used to
reduce the weight of building structures and improve thermal insulation
efficiency of buildings. This study, therefore, focused on the
synthesis of lightweight geopolymer. Suitable lightweight source
materials containing silica and alumina such as diatomaceous earth
(DE) and rice husk ash (RHA) are available in large quantity in
Thailand. DE contains both silica and alumina and RHA contains
mainly silica.