Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

X-ray diffraction pattern, densities and other data

The density of C-S-H gel depends on the water content. For strongly dried samples, it also depends on how the solid volume is defined, causing observed values to vary with the fluid used in their determination. Widely, differing values can thus be equally meaningful, but for a given application) the appropriate one must be used. Since the C-S-H in CjS or P-CjS pastes is mixed with CH, it is necessary either to correct for this phase (D = [Pg.140]

The C-S-H present in a saturated paste is assumed to include that part of the porosity, and its content of water, without which it cannot be formed. The H20/Si02 ratio is approximately 4.0. Assuming the water in excess of that present at 11% RH to have a density of 1000 kg m , Hansen (H28) calculated the density of the C-S-H to be 1850-1900 kg m . This value is near those of 1900-2100kgm for cement pastes under saturated conditions (P20), if allowance is made for the CH and other hydrated phases which these contain. [Pg.141]

Soroka (R17) found these to increase with the degree of hydration, an upper limit of 2700 kg being found for a specific cement. [Pg.142]

Feldman (FI6) explained the difference between the values for D-dried samples obtained with aqueous and other fluids. When the material is dried, the layers partially collapse, and some empty spaces remain between them. Water penetrates into this space, and the density obtained, after correction for CH and any other phases present, is that of the layers themselves. Organic liquids do not penetrate, and helium penetrates only slowly. The empty interlayer space is counted as part of the solid volume, with a consequent decrease in the measured density. [Pg.142]

The IR absorption spectra of CjS, alite or P-C S, pastes (H29.L22,S44) are relatively diffuse, as would be expected from the poor crystallinity. Si-0 stretching is represented by a single, broad band peaking at about 970 cm this is compatible with the existence of condensed silicate anions. Small amounts of carbonate are readily detectable by the absorption near 1400 cm . [Pg.142]

See other pages where X-ray diffraction pattern, densities and other data is mentioned: [Pg.140]   


SEARCH



DATA DENSITY

Data others

Data patterns

Diffraction data

Diffraction patterns

Pattern density

Patterning pattern density

Ray Diffraction Patterns

X pattern

X-data

X-ray diffraction and

X-ray diffraction data

X-ray diffraction data and

X-ray pattern

© 2024 chempedia.info