Assessment of Geopolymer Concrete for Underwater Concreting Properties

Archives of Metallurgy and Materials

article

Fakhryna Hannanee Ahmad Zaidi¹  Romisuhani Ahmad¹  Mohd Mustafa Al Bakri Abdullah³  Wan Mastura Wan Ibrahim¹  Ikmal Hakem Aziz³  Subaer Junaidi⁴  Salmabanu Luhar² 

[1] Universiti Malaysia Perlis, Faculty of Engineering Technology;Universiti Malaysia Perlis ,(UniMAP), Pgeopolymer & Green Technology, Centre of Excellence;Universiti Malaysia Perlis, Faculty of Chemical Engineering Technology;Universitas Negeri Makassar, Geopolymer & Green Material Group, Physics Department;Frederick Research Center

关键词: Geopolymer;    Underwater concrete;    Fly ash;    Kaolin;   

DOI  :  10.24425/amm.2022.137805

学科分类：物理（综合）

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

For ages, concrete has been used to construct underwater structures. Concrete laying underwater is a very complex procedureimportant to the success or failure of underwater projects. This paper elucidates the influence of alkali activator ratios on geopolymers for underwater concreting; focusing on the geopolymer concrete synthesized from fly ash and kaolin activated using sodiumhydroxide and sodium silicate solutions. The geopolymer mixtures were designed to incorporate multiple alkali activator ratios toevaluate their effects on the resulting geopolymers’ properties. The fresh concrete was molded into 50 mm cubes in seawater using the tremie method and tested for its engineering properties at 7 and 28 days (curing). The control geopolymer and underwatergeopolymers’ mechanical properties, such as compressive strength, water absorption density, and setting time were also determined.The differences between the control geopolymer and underwater geopolymer were determined using phase analysis and functionalgroup analysis. The results show that the geopolymer samples were optimally strengthened at a 2.5 alkali activator ratio, and themechanical properties of the control geopolymer exceeded that of the underwater geopolymer. However, the underwater geopolymer was determined to be suitable for use as underwater concreting material as it retains 70% strength of the control geopolymer.

【 授权许可】

CC BY-NC