2016 Fiscal Year Research-status Report
Surface chemistry of calcium aluminosilicate hydrate (C-A-S-H) for ions immobilization and transport in low carbon cementitious materials
| Project/Area Number |
16K18129
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| Research Institution | Hokkaido University |
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Principal Investigator |
Y Elakneswaran 北海道大学, 工学研究院, 特任助教 (60769090)
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| Project Period (FY) |
2016-04-01 – 2018-03-31
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| Keywords | Cement chemistry / C-A-S-H / surface chemistry / ionic adsorption / modelling |
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| Outline of Annual Research Achievements |
Three different calcium silicate hydrates (C-S-H) with Ca/Si ratio of 0.8, 1.0, and 1.5 were prepared and characterised by various experimental methods. The surface site densities of C-S-H were determined from 29Si MAS NMR and specific surface area. Potentiometric titration, and zeta potential of C-S-H suspensions in NaOH Ca(OH)2, and CaCl2 solutions were conducted and the experimental results were fitted to surface complexation model, called CD-MUSIC (Charge Distribution MUlti Site Ion Complexation) modelling results to determine associated equilibrium constants for dissociation and ionic adsorption. A batch experiment was performed to determine Ca2+ and Cl- adsorption on C-S-H surface and compared with modelling results. Two papers have submitted to journals and they are under review.
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| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
A delay on synthesising pure calcium aluminosilicate hydrate (C-A-S-H). Now, I succeed to synthesise C-A-S-H and conducting potentiometric titration and zeta potential experiments to determine surface electrical properties.
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| Strategy for Future Research Activity |
The remaining part of Work-packages 2 and 3: The other ions (Na+, K+, Cs+, and SO42-) adsorption on C-S-H; determination of surface site density and associated equilibrium constants of C-A-S-H gels and their ionic adsorption capacity.
Work-package 3: Experiments and surface complexation modelling on slag containing paste
Work-package 4: Development and verification of a coupled ionic adsorption and reactive transport model for slag containing materials
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| Causes of Carryover |
A delay on initiation of experimental works and synthesizing pure calcium aluminosilicate hydrates. T
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| Expenditure Plan for Carryover Budget |
I will cover the rest of experimental work of last year in addition to this year planned research work.
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