Preparation of Clean Alkali-Activated Slag Cementitious Material by Combined Activator of Na2SiO3/Na2CO3

Abstract

Abstract: This study is aimed to solve the problems of weak mechanical properties and low degree of slag reaction when weak single alkali-activated slag cementitious material (AASM), and to alleviate the operational hazards of AASM. Therefore, a combined activator of Na₂SiO₃/Na₂CO₃ was used to investigate its influence on the setting time, compressive strength, hydration products and autogenous shrinkage of AASM. Moreover, the environmental benefit of AASM was assessed. The experimental results show that the retarding effect is significant and the compressive strength is reduced with the increase of Na₂CO₃ alkali dosage, whereas the reduction rate of compressive strength is slightly decreased as the hydration time increased. More types of hydration products are produced by adding Na₂CO₃. The amount of C-(A)-S-H increased first follow by a decrease with the increase of Na₂CO₃ alkali dosage, thus explaining the changes in the autogenous shrinkage. Furthermore, based on the CO₂ emission index, the combined Na₂SiO₃/Na₂CO₃ activated slag is produced in a cleaner manner with greater environmental benefit, compare to the Na₂SiO₃ activated slag.

Key words: alkali-activated slag, combined activator, Na₂CO₃, hydration product, autogenous shrinkage, CO₂ emission index

CLC Number:

TU528

ZHANG Liheng, CHEN Peiyuan, TAN Weibo, WANG Yonghui. Preparation of Clean Alkali-Activated Slag Cementitious Material by Combined Activator of Na₂SiO₃/Na₂CO₃[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(1): 235-240.

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Preparation of Clean Alkali-Activated Slag Cementitious Material by Combined Activator of Na₂SiO₃/Na₂CO₃

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