Fractal Structure of C-S-H and Tobermorite Phases

• Authors: J. Janik , W. Kurdowski , R. Podsiadły , J. Samseth
• Languages of publication: EN

Abstracts

EN

The C-S-H I phase is the main component of the cement paste, which is a near-amorphous, highly porous gel. Due to high porosity of the sample in this phase we can observe a fractal nature of the volume pores distribution, similar to that observed for silica aerogels. The C-S-H I phase is thermodynamically unstable and crystallize to a tobermorite phase, forming crystal aggregates on the surface of the amorphous paste. The mixture of these two phases, formed in this way, have irregular volume and surface structures, both of which may exhibit the fractal nature. To study the fractal nature of the matter the small angle neutron scattering method is frequently used. We present here the results of small angle neutron scattering studies supported by the X-ray diffraction and scanning electron microscope observations of several samples with the common molar C/S ratio equal to 1. Some of the samples were autoclaved during various time periods to accelerate transformation of the C-S-H I phase to tobermorite. We observed the fractal properties of the volume structure of all samples under study. Moreover, we observed also the fractal behaviors of the surfaces of the samples which were autoclaved.

Keywords

EN

61.12.Ex; 82.70.Gg

Discipline

• 82.70.Gg: Gels and sols

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2001
• Volume: 100
• Issue: 4
• Pages: 529-537

Dates

published

2001-10

received

2001-05-28

Contributors

author

J. Janik

• H. Niewodniczański Institute of Nuclear Physics, Radzikowskiego 152, 31-342 Kraków, Poland

author

W. Kurdowski

• Mining Academy, Mickiewicza 30, 30-059 Kraków, Poland

author

R. Podsiadły

• M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland

author

J. Samseth

• Institutt for energiteknikk, 2007 Kjeller, Norway

References

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Identifiers

DOI

10.12693/APhysPolA.100.529