Civil Engineering Reference
In-Depth Information
Figure 40.
DTA of air-entrained 0.5 W/C cement paste saturated with brine of various
concentrations.
Beddoe and Setzer
[82]
carried out extensive investigations on the
freezing phenomenon in cement pastes, applying the DSC technique.
Themograms were obtained in the temperature range of 20 to -175°C. The
pores in the paste were classified into three groups, viz., macro, meso, and
micro of radii > 50, 2-50, and < 2 nm, respectively. Figure 41 shows DSC
curves of a cement paste containing different amounts of NaCl. Three
endothermal effects occur in some samples. A general displacement of
