Authors:Alina Vattai and Nikoletta Rozgonyi-Boissinot
normal stress (σ n ), joint compressive strength (JCS), friction angle (φ), and joint roughness coefficient (JRC). JRC can be estimated by numerous methods: (a) the comparison of the measured profiles of the specimens with standard ones ( Barton and
Authors:Vlasta Harbuľáková, Adriana Eštoková, and Nadežda Števulová
character system of silicates material determination, (in Czech),
15 th Construmat 2009
, 2009, pp. 85–90.
Dudikova M, Kolisko J. Aplication of confocal scanning microscope LEXT OLS 3000 for roughness of ceiling concrete
Authors:V. Balek, T. Banba, I. Bekman, Z. Málek, and J. Šubrt
Emanation thermal analysis (ETA) was used for characterization of the thermal behaviour of a borosilicate glass, designed
for the vitrification of hazardous waste. Changes of release rate of radon atoms from the glass sample were measured continuously
during heating in an air flow from 20 to 1000C. Annealing of surface roughness, cracks and technological defects was indicated
in the temperature range of 275–400C by a decrease of radon release rate. A decrease of viscosity of the glass sample (in
the proximity of the glass transition temperature, Tg) was indicated by the increase of the radon release rate starting at 430C, whereas the decrease in the radon release rate
starting, at 600C, corresponded to the glass softening. Mathematical modelling was used for the description of the kinetics
of radon release from the labelled glass sample and for the simulation of the ETA curve. Good agreement between the experimental
data and the results of mathematical modelling of the ETA curve was found.