Reaction kinetics in sodium silicate powder and liquid activated slag binders evaluated using isothermal calorimetry

2012 ◽  
Vol 546 ◽  
pp. 32-43 ◽  
Author(s):  
Deepak Ravikumar ◽  
Narayanan Neithalath
Keyword(s):  
Reaction Kinetics ◽  
Sodium Silicate ◽  
Isothermal Calorimetry ◽  
Activated Slag

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.

Chemical and physical effects of high-volume limestone powder on sodium silicate-activated slag cement (AASC)

2021 ◽  
Vol 292 ◽  
pp. 123257
Author(s):  
Xiaohong Zhu ◽  
Xiaojuan Kang ◽  
Jiaxin Deng ◽  
Kai Yang ◽  
Shouheng Jiang ◽  
...  
Keyword(s):  
Sodium Silicate ◽  
High Volume ◽  
Limestone Powder ◽  
Slag Cement ◽  
Physical Effects ◽  
Activated Slag

Sodium silicate activated slag-fly ash binders: Part I - Processing, microstructure, and mechanical properties

2018 ◽  
Vol 101 (6) ◽  
pp. 2228-2244 ◽  
Author(s):  
Kaushik Sankar ◽  
Peter Stynoski ◽  
Ghassan K. Al-Chaar ◽  
Waltraud M. Kriven
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Sodium Silicate ◽  
Microstructure And Mechanical Properties ◽  
Activated Slag

scholarly journals Alkali-activated slag cements produced with a blended sodium carbonate/sodium silicate activator

2016 ◽  
Vol 28 (4) ◽  
pp. 262-273 ◽  
Author(s):  
Susan A. Bernal ◽  
Rackel San Nicolas ◽  
Jannie S. J. van Deventer ◽  
John L. Provis
Keyword(s):  
Sodium Silicate ◽  
Sodium Carbonate ◽  
Alkali Activated Slag ◽  
Activated Slag ◽  
Alkali Activated

scholarly journals One-Part Alkali-Activated Pastes and Mortars Prepared with Metakaolin and Biomass Ash

2020 ◽  
Vol 10 (16) ◽  
pp. 5610
Author(s):  
Alessandra Mobili ◽  
Francesca Tittarelli ◽  
Hubert Rahier
Keyword(s):  
Compressive Strength ◽  
Reaction Kinetics ◽  
Isothermal Calorimetry ◽  
Molar Ratio ◽  
Alkaline Solutions ◽  
Strength Increase ◽  
Biomass Ash ◽  
Solid Ratio ◽  
User Friendly ◽  
Alkali Activated

Common alkali-activated materials (AAMs) are usually manufactured with highly alkaline solutions. However, alkaline solutions are dangerous for workers who must wear gloves, masks, and glasses when handling them. This issue makes common (or two-part) AAMs not user-friendly and problematic for bulk production if no safety procedures are followed. In this paper, the possibility of manufacturing alkali-activated pastes and mortars without alkaline solution is investigated. These innovative one-part AAMs have been prepared with metakaolin as the aluminosilicate precursor, potassium-rich biomass ash as the alkaline activator, and water. AAMs have been prepared by varying the K/Al molar ratio: pastes have been studied in terms of reaction kinetics, through isothermal calorimetry, and mortars have been tested in terms of mechanical compressive strength. Results show that the K/Al molar ratio governs both the reaction kinetics and the mechanical strength of these innovative materials. The highest compressive strength is obtained when the K/Al ratio is equal to 2.5 and the water/solid ratio is equal to 0.49. If biomass ash is heated at 700 °C to decompose the calcium carbonate, its reactivity and the final compressive strength increase.

scholarly journals Influence of sodium silicate powder silica modulus for mechanical and chemical properties of dry-mix alkali-activated slag mortar

2020 ◽  
Vol 233 ◽  
pp. 117354 ◽  
Author(s):  
Tero Luukkonen ◽  
Harisankar Sreenivasan ◽  
Zahra Abdollahnejad ◽  
Juho Yliniemi ◽  
Anu Kantola ◽  
...  
Keyword(s):  
Sodium Silicate ◽  
Chemical Properties ◽  
Alkali Activated Slag ◽  
Activated Slag ◽  
Alkali Activated ◽  
And Chemical Properties

SODIUM SILICATE ACTIVATED SLAG-FLY ASH CEMENT

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Jan Pieter Vermeulen ◽  
Natalie Lloyd
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Silica Fume ◽  
Sodium Silicate ◽  
Blast Furnace Slag ◽  
High Strength ◽  
Chemical Balance ◽  
Aluminum Hydrate ◽  
Activated Slag ◽  
Furnace Slag

This research examines an alternative binder, Alkali Activated Cement (AAC), examining the fresh and hardened mechanical properties of twelve AAC mortar mixes with varying mixture proportions of blast-furnace slag, fly ash, sodium silicate (the alkali activator), and additional water. In addition to the Slag-Fly Ash mortars, nine mixtures with blast-furnace slag, silica fume, aluminum hydrate, sodium silicate, and water were tested. For all mortars, the compressive strength was exponentially related to the water/activator-solids ratio. Mortar strengths at 28 days ranged from 5 MPa to 20 MPa. Increasing the slag to binder-solids ratio from 0.1 to 0.2 increased the strength with water to binder ratios from 0.2 to 0.4. However, rapid or almost instantaneous setting times were observed for a slag to binder-solids ratio of 0.2. The research concluded that using a carefully chosen mix design can prevent quick setting while still achieving high strength and acceptable workability. It is suggested the CaO to binder-solids ratio remain below 0.07; a sodium silicate to binder solids ratio of around 0.25 is optimal; a water to binder-solids ratio should be around 0.3. When replacing fly ash, a Si/Al ratio above 2 is recommended. This research concluded that other solids (Silica Fume and Aluminum Hydrate) could replace Slag and/or Fly Ash if the overall chemical balance of the system is maintained.

Evolution of binder structure in sodium silicate-activated slag-metakaolin blends

2011 ◽  
Vol 33 (1) ◽  
pp. 46-54 ◽  
Author(s):  
Susan A. Bernal ◽  
John L. Provis ◽  
Volker Rose ◽  
Ruby Mejía de Gutierrez
Keyword(s):  
Sodium Silicate ◽  
Activated Slag ◽  
Binder Structure
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