ISSN:
1572-8943
Keywords:
BET
;
clinker phases
;
C—S—H gel
;
porosity
;
surface area
;
thermoporosimetry
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The capillary porosity of clinker phases, i.e. 3CaOSiO2, β2CaOSiO2, 3CaOAl2O3 and 4CaOAl2O3Fe2O3, at the early stages of hydration has been studied by the methods of Differential Scanning Calorimetry and nitrogen adsorption (BET). It was established that pores of 3–70 nm were formed during the hydration of 3CaOSiO2 and the maximum of their distribution was found at about 10 nm. The hydration of 2CaOSiO2 is much slower and the porosity is one order of magnitude lower. During the hydration of 3CaOAl2O3 the content of crystalline hexagonal hydrates prevailed and the porosity was in the range 5–90 nm with the average pore diameter of about 16 nm. This average pore diameter was much smaller for thermoporosimetry and lay at about 7 nm. The hydrated 4CaOAl2O3Fe2O3 sample had the porosity in the range 3–90 nm with the maximum of the pores distribution at about 4 nm. There are some differences between the porosities measured by BET and thermoporosimetry. Principally thermoporosimetry gives no information about larger capillary pores in the range 30–50 nm.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1010170808974
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