The Strength Properties of Alkali-Activated Slag Mortars by Combined Caustic Alkali with Sodium Carbonate as Activator

2012 ◽  
Vol 24 (6) ◽  
pp. 745-752 ◽  
Author(s):  
Tae-Wan Kim
Keyword(s):  
Sodium Carbonate ◽  
Strength Properties ◽  
Caustic Alkali ◽  
Alkali Activated Slag ◽  
Activated Slag ◽  
Alkali Activated

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 Effect of superplastizicer type on the fresh and strength properties of alkali activated slag composites

2020 ◽  
Vol 491 ◽  
pp. 012046
Author(s):  
K Muhammed Nabil ◽  
S Namitha ◽  
Reshma Sundhar ◽  
N V Mohammed Rafeeque ◽  
Thushara Raju ◽  
...  
Keyword(s):  
Strength Properties ◽  
Alkali Activated Slag ◽  
Activated Slag ◽  
Alkali Activated

scholarly journals Alteration in Molecular Structure of Alkali Activated Slag with Various Water To Binder Ratios Under Accelerated Carbonation

2021 ◽  
Author(s):  
Thi Nhan Nguyen ◽  
Quoc Phung ◽  
Ziyou Yu ◽  
Lander Frederickx ◽  
Diederik Jacques ◽  
...  
Keyword(s):  
Sodium Carbonate ◽  
Cementitious Materials ◽  
Mas Nmr ◽  
Accelerated Carbonation ◽  
Alkali Activated Slag ◽  
Before And After ◽  
Activated Slag ◽  
A Charge ◽  
A Minor ◽  
Alkali Activated

Abstract Carbonation of alkali activated materials is one of the main deteriorations affecting their durability. However, current understanding in structural alteration of these materials exposed to an environment inducing carbonation at nano/micro scale remains limited. This study examined the evolution of phase assemblages of alkali activated slag mortars subjected to accelerated carbonation (1% CO2, 60% relative humidity, up to 28 day carbonation) using XRD, FTIR and 29Si, 27Al, 23Na MAS NMR. Samples with three water to binder (w/b) ratios (0.35, 0.45, and 0.55) were investigated. The results show that the phase assemblages mainly consisted of C-A-S-H, disordered remnant aluminosilicate binder, and a minor hydrotalcite as a secondary product. Upon carbonation, calcium carbonate is mainly formed as the vaterite polymorph, while no sodium carbonate is found after carbonation as commonly reported. The sodium acts primarily as a charge balancing ion without producing sodium carbonate as a final carbonation product in 28-day carbonated materials. The C-A-S-H structure becomes more cross-linked due to the decalcification of this phase evidenced by the appearance of Q4 groups, which replace the Q1 and Q2 ones as observed in the 29Si MAS NMR spectra, and the dominance of Al (IV) in 27Al MAS NMR. Especially, unlike cementitious materials, the influence of w/b ratio on the crystalline phase formation and structure of C-A-S-H in the alkali activated mortars before and after carbonation is limited.

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

2015 ◽  
pp. 1-12 ◽  
Author(s):  
Susan A. Bernal ◽  
Rackel San Nicolas ◽  
John L. Provis ◽  
Jannie S. J. van Deventer
Keyword(s):  
Sodium Silicate ◽  
Sodium Carbonate ◽  
Alkali Activated Slag ◽  
Activated Slag ◽  
Alkali Activated

Influence of the combination of calcium oxide and sodium carbonate on the hydration reactivity of alkali-activated slag binders

2018 ◽  
Vol 171 ◽  
pp. 622-629 ◽  
Author(s):  
Junxiang Wang ◽  
XianJun Lyu ◽  
Lingyun Wang ◽  
Xiaoqiang Cao ◽  
Qing Liu ◽  
...  
Keyword(s):  
Calcium Oxide ◽  
Sodium Carbonate ◽  
Alkali Activated Slag ◽  
Activated Slag ◽  
Alkali Activated
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