scholarly journals Slag and Activator Chemistry Control the Reaction Kinetics of Sodium Metasilicate-Activated Slag Cements

2018 ◽  
Vol 10 (12) ◽  
pp. 4709 ◽  
Author(s):  
Maria Criado ◽  
Brant Walkley ◽  
Xinyuan Ke ◽  
John Provis ◽  
Susan Bernal
Keyword(s):  
Blast Furnace ◽  
Physical Properties ◽  
Reaction Kinetics ◽  
Isothermal Calorimetry ◽  
Sodium Metasilicate ◽  
Clear Correlation ◽  
Close Relationship ◽  
Slag Glass ◽  
Activated Slag ◽  
Kinetics Of

The reaction kinetics of four commercial ground granulated blast furnace slags with varying percentages of MgO (6 to 14 wt.%), activated with four different doses of sodium metasilicate, were evaluated using isothermal calorimetry. The reaction kinetics were strongly dependent on the dose of the alkaline activator used, and the chemical and physical properties of the slag. When using low concentrations of sodium metasilicate as an activator, the MgO content in the slag influences the kinetics of the reaction, while the CaO content plays a more significant role when the concentration of metasilicate is increased. This study elucidated a close relationship between the dose of the alkali-activator and the chemistry of the slag used, although it was not possible to identify a clear correlation between any of the published chemically-based “slag quality moduli” and the calorimetry results, highlighting the complexity of blast furnace slag glass chemistry, and the importance of the physical properties of the slag in defining its reactivity.

Physical properties and reaction kinetics of CO2 absorption into unloaded and CO2 loaded viscous monoethanolamine (MEA) solution

2021 ◽  
Vol 329 ◽  
pp. 115569
Author(s):  
Rouzbeh Ramezani ◽  
Ida M. Bernhardsen ◽  
Renzo Di Felice ◽  
Hanna K. Knuutila
Keyword(s):  
Physical Properties ◽  
Reaction Kinetics ◽  
Co2 Absorption ◽  
Kinetics Of

scholarly journals Preliminary Interpretation of the Induction Period in Hydration of Sodium Hydroxide/Silicate Activated Slag

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4796
Author(s):  
Yibing Zuo ◽  
Guang Ye
Keyword(s):  
Induction Period ◽  
Isothermal Calorimetry ◽  
Action Mechanism ◽  
Alkali Activated Slag ◽  
Alkaline Activator ◽  
Activated Slag ◽  
Calorimetric Studies ◽  
Kinetics Of ◽  
Alkali Activated ◽  
Good Interpretation

Many calorimetric studies have been carried out to investigate the reaction process of alkali-activated slag paste. However, the origin of the induction period and action mechanism of soluble Si in the dissolution of slag are still not clear. Moreover, the mechanisms behind different reaction periods are not well described. In this study, the reaction kinetics of alkali-activated slag paste was monitored by isothermal calorimetry and the effect of soluble Si was investigated through a dissolution test. The results showed that occurrence of the induction period in hydration of alkali-activated slag paste depended on the presence of soluble Si in alkaline activator and the soluble Si slowed down the dissolution of slag. A dissolution theory-based mechanism was introduced and applied to the dissolution of slag, showing good interpretation of the action mechanism of soluble Si. With this dissolution theory-based mechanism, origin of the induction period in hydration of alkali-activated slag was explicitly interpreted.

Physical properties and reaction kinetics of cotton cellulose crosslinked with dimethyloldihydroxyethyleneurea-maleic acid

2004 ◽  
Vol 92 (6) ◽  
pp. 3886-3893 ◽  
Author(s):  
Han-Hsing Hsiung ◽  
Hung-Yu Huang ◽  
Yuen-Hua Wang ◽  
Chang Wang ◽  
Jui-Chin Chen ◽  
...  
Keyword(s):  
Physical Properties ◽  
Reaction Kinetics ◽  
Maleic Acid ◽  
Cotton Cellulose ◽  
Kinetics Of

Effects of calcined dolomite addition on reaction kinetics of one-part sodium carbonate-activated slag cements

2019 ◽  
Vol 211 ◽  
pp. 329-336 ◽  
Author(s):  
Tao Yang ◽  
Zuhua Zhang ◽  
Huajun Zhu ◽  
Wei Zhang ◽  
Yanan Gao ◽  
...  
Keyword(s):  
Reaction Kinetics ◽  
Sodium Carbonate ◽  
Activated Slag ◽  
Kinetics Of

scholarly journals Effect of Sodium Disilicate and Metasilicate on the Microstructure and Mechanical Properties of One-Part Alkali-Activated Copper Slag/Ground Granulated Blast Furnace Slag

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5505
Author(s):  
Patrick Ninla Lemougna ◽  
Nicole Dilissen ◽  
Guillermo Meza Hernandez ◽  
Felicite Kingne ◽  
Jun Gu ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Isothermal Calorimetry ◽  
Copper Slag ◽  
Sodium Metasilicate ◽  
Granulated Blast Furnace Slag ◽  
Sodium Disilicate ◽  
Lower Porosity ◽  
Furnace Slag ◽  
Alkali Activated

Copper slag (CS) remains a challenging industrial by-product with a relatively small utilization fraction. The present study investigated the development of one-part alkali-activated cements based on CS, ground granulated blast furnace slag (GGBS) and a mixture of the two as a precursor. We investigated 5 to 15 wt% solid sodium metasilicate (Na2SiO3) and disilicate (Na2Si2O5) as alkaline reagents. Isothermal calorimetry showed that the reactivity of the system was higher for the metasilicate based samples, with early reaction and higher cumulative heat released. Metasilicate based samples also presented a more densified microstructure, lower porosity and higher strength. Better performances were observed with 10 wt% metasilicate/disilicate with respect to the 5 and 15 wt%. The 28-day compressive strength and elastic modulus of 10 wt% metasilicate samples reached 75 MPa and 25 GPa, respectively, and, for paste samples, ranged from 100 wt% GGBS to 50/50 wt% CS/GGBS. The microstructure and calorimetry of the pastes showed that GGBS actively participated in the binding process, whereas CS played a smaller role and acted as a filler and catalyst. The substitution of commercial GGBS by CS up to 50 wt% did not affect the overall performance, thus, bringing CS forward as an economically interesting precursor.

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