A Study on the Influence of Sodium Silicate Concentration and SiO2 : Na2O Ratio on the Properties of Low-Calcium Fly Ash-Based Alkali-Activated Materials Cured at Ambient Condition

Low-calcium Fly ash-based alkali-activated materials (AAM) have some extraordinary properties such as high fire resistance and low shrinkage. However, they have lower strength and high setting time when curing at ambient temperature conditions. Therefore, this research aimed to improve the strength...

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Bibliographic Details
Published in:Advances in materials science and engineering 2022-03, Vol.2022, p.1-7
Main Author: Rasuli, Mohammad Idris
Format: Article
Language:English
Subjects:
Ambient temperature
Calcium
Caustic soda
Cement
Compressive strength
Concrete
Curing
Experiments
Fire resistance
Fly ash
Heat
Mortars (material)
Silica
Silicon dioxide
Slag
Sodium
Sodium hydroxide
Sodium silicates
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Summary:Low-calcium Fly ash-based alkali-activated materials (AAM) have some extraordinary properties such as high fire resistance and low shrinkage. However, they have lower strength and high setting time when curing at ambient temperature conditions. Therefore, this research aimed to improve the strength and setting time of low-calcium fly ash-based AAM curing at ambient temperature conditions. The effect of the changes in concentration and modulus of sodium silicate and curing condition of the materials were studied on the properties of the AAM. Fly ash type II, 32% sodium metasilicate pentahydrate, 32 and 56% sodium disilicate solution, 8M sodium hydroxide, and standardized were used. Using 32% sodium disilicate solution significantly improved the flowability of mortar. Moreover, it increased the compressive strength and remarkably decreased the setting time of AAM at ambient temperature curing. The decrease in the concentration of sodium disilicate has a significant influence on the reactivity of fly ash.
ISSN:1687-8434
1687-8442
DOI:10.1155/2022/7762507