Hydration products in two aged cement pastes

Pozzolanic Activity of Diatomaceous Earth

“…3(a), can be observed, suggesting that a small fraction of the unreacted Ca(OH) 2 is carbonated during the TG measurements. 24 Figures 4(a)-(c) show the FTIR spectra of the DEs, as well as the pastes after 14, 28, and 90 days of hydration. The following bands are noteworthy: first, the bands around 1630 cm À1 and in the 3200-3500 cm À1 range are associated with -OH groups in water or silanol groups.…”

Vibrational investigation of calcium-silicate cements for endodontics in simulated body fluids

“…On the other hand, the wTC-Bi cement formed a deposit thinner than 2 lm, constituted by B-type carbonated apatite, calcite (bands at 1412, 872 and 711 cm À1 [51]) and aragonite (bands at 1455, 844 and 711 cm À1 [52,53]). The bands due to these phases overlapped with bands assignable to cement components (belite, 844 cm À1 ) and its hydration products.…”

Diatomaceous Earth as a Pozzolan in the Fabrication of an Alkali‐Activated Fine‐Aggregate Limestone Concrete

“…It is interesting to note that the LM and F1.75 samples show a slight weight gain at around 6001C, which is most probably due to portlandite carbonation during the TGA measurement. 34 Clearly, F0.28 has the largest weight loss due to the C-S-H gel, which explains its high compressive strength. In addition, this B12% weight loss is constant over time, indicating that all of the available portlandite and DE had reacted to form the C-S-H gel after 14 days, again confirming the XRD results.…”

“…The weight loss between 4001 and -6001C was assumed to be due to the decarboxylation of Ca(OH) 2 . 34,35 Any weight loss at T46001C was presumed to be due to the decarbonation of calcite. This decarbonation is partial, however, as the maximum temperature of the TGA used herein was 8001C.…”