scholarly journals Effect of drying procedures on pore structure and phase evolution of alkali-activated cements

2019 ◽  
Vol 96 ◽  
pp. 194-203 ◽  
Author(s):  
Zuhua Zhang ◽  
Yingcan Zhu ◽  
Huajun Zhu ◽  
Yu Zhang ◽  
John L. Provis ◽  
...  
Keyword(s):  
Pore Structure ◽  
Phase Evolution ◽  
Drying Procedures ◽  
Alkali Activated

scholarly journals Effect of CaSO4 Incorporation on Pore Structure and Drying Shrinkage of Alkali-Activated Binders

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1673 ◽  
Author(s):  
Hyeongmin Son ◽  
Sol Moi Park ◽  
Joon Ho Seo ◽  
Haeng Ki Lee
Keyword(s):  
Fly Ash ◽  
Pore Structure ◽  
Drying Shrinkage ◽  
Phase Changes ◽  
X Ray Diffraction ◽  
Activated Slag ◽  
Capillary Tension ◽  
Alkali Activated Binders ◽  
Internal Pore Structure ◽  
Alkali Activated

This present study investigates the effects of CaSO4 incorporation on the pore structure and drying shrinkage of alkali-activated slag and fly ash. The slag and fly ash were activated at a 5:5 ratio by weighing with a sodium silicate. Thereafter, 0%, 5%, 10%, and 15% of CaSO4 were incorporated to investigate the changes in phase formation and internal pore structure. X-Ray Diffraction (XRD), thermogravimetry (TG)/derivative thermogravimetry (DTG), mercury intrusion porosimetry (MIP), nuclear magnetic resonance (NMR), and drying shrinkage tests were carried out to find the correlation between the pore structure and drying shrinkage of the specimens. The results showed that CaSO4 incorporation increased the formation of thenardite, and these phase changes affected the pore structure of the activated fly ash and slag. The increase in the CaSO4 content increased the pore distribution in the mesopore. As a result, the capillary tension and drying shrinkage decreased.

Microstructure and phase evolution of alkali-activated steel slag during early age

2019 ◽  
Vol 204 ◽  
pp. 158-165 ◽  
Author(s):  
Ze Liu ◽  
Da-wang Zhang ◽  
Li LI ◽  
Ji-xiang Wang ◽  
Ning-ning Shao ◽  
...  
Keyword(s):  
Steel Slag ◽  
Phase Evolution ◽  
Early Age ◽  
Alkali Activated

X-ray microtomography shows pore structure and tortuosity in alkali-activated binders

2012 ◽  
Vol 42 (6) ◽  
pp. 855-864 ◽  
Author(s):  
John L. Provis ◽  
Rupert J. Myers ◽  
Claire E. White ◽  
Volker Rose ◽  
Jannie S.J. van Deventer
Keyword(s):  
Pore Structure ◽  
X Ray ◽  
Alkali Activated Binders ◽  
Alkali Activated

Strength Development and Pore Structure of Alkali-Activated Slag Cement in Bittern Environment

2014 ◽  
Vol 584-586 ◽  
pp. 1440-1443
Author(s):  
Qiang Song ◽  
Jian Hui Zhu ◽  
Xiao Yan Zhang
Keyword(s):  
Pore Structure ◽  
Pore Volume ◽  
Total Pore Volume ◽  
Experimental Results ◽  
Strength Development ◽  
Soaking Time ◽  
Alkali Activated Slag ◽  
Chemical Attack ◽  
Activated Slag ◽  
Alkali Activated

The effect of bittern on alkali-activated slag (AAS) cement and OPC was studied by testing on the strength and pore structure of the specimens stored in artificial bittern solution at certain periods. The experimental results show that the (AAS) cement exhibits excellent resistance to chemical attack of bittern. The significant increase of strength of (AAS) mortar stored in bittern solution was observed with the soaking time, and the strength increases very quickly before 27 d. But the strength of OPC decreases fast after17d. The more the contents of NaOH activator in AAS cement, the more the strength gained. And the more the contents of activator, the less porosity is. Curing the AAS cement in bittern environment leads to a reduction in the total pore volume and to a refinement of the pore structures.

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