Alkali-activated laterite binders: Influence of silica modulus on setting time, Rheological behaviour and strength development

Cleaner Engineering and Technology

Thamer Alomayri¹  Adeyemi Adesina²  Gisèle Laure Lecomte-Nana³  Uphie Chinje Melo⁴  Elie Kamseu⁵  Cyriaque Rodrigue Kaze⁶ 

[1] Corresponding author.;Institut de Recherche sur Les Céramiques (IRCER, UMRCNRS 7315), ENSIL-ENSCI, Université de Limoges, CEC, 12 Rue Atlantis, 87068, Limoges Cedex, France;Department of Civil and Environmental Engineering, University of Windsor, Windsor, Canada;Department of Physics, Faculty of Applied Science, Umm Al-Qura University, Makkah, 21955, Saudi Arabia;Institut de Recherche sur Les Céramiques (IRCER, UMRCNRS 7315), ENSIL-ENSCI, Université de Limoges, CEC, 12 Rue Atlantis, 87068, Limoges Cedex, France;Laboratory of Applied Inorganic Chemistry, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon;

关键词: Laterite;    Silica modulus;    Setting time rheology;    Mechanical properties;    Microstructure;   

DOI  :  

来源: DOAJ

【 摘 要 】

This paper present the results from a comprehensive study undertaken to investigate and develop alkali-activated binders (AABs) with laterite soil as the aluminosilicate precursor. In this study, the effect of the silica modulus (SiO2/Na2O) of the activator on the setting time, rheological properties and strength development were investigated. Iron-rich laterite sourced from West Africa was used as the aluminosilicate precursor alongside sodium silicate and sodium hydroxide for the production of the activator. The activators were prepared to have varying silica modulus of 1.3, 1.5, 1.7 and 2. The findings from this study showed that the silica modulus of the activator used in the synthesis of the laterite-based AABs has a significant influence on the resulting properties of the binders. It was found out the optimum silica modulus is 1.3 and increasing the silica modulus of the activator results in detrimental effects on the hardened properties of the AABs. In the same context, increasing the silica modulus of the activator from 1.3 to 2.0 extended the final setting of the binder time by 56.1% while the compressive strength at 56 days reduced by 57%. Microstructural investigation on the binders showed that the main products of alkali activation of the calcined laterite are quartz, ilmenite, hematite and maghemite. It was concluded that laterite-based AABs with good performance can be produced with a silica modulus of 1.3 and used as a possible alternative for Portland cement as a binder.

【 授权许可】

Unknown