Page 417 - Handbook of Thermal Analysis of Construction Materials

394 Chapter 9 - Non-Portland Cement Binders and Concrete

containing 2 and 5% CaCl . In general, pore size analysis of Reg Set cement
2
paste indicates that the concentration of small pores is greater for those
pastes hydrated in the presence of CaCl .
2

Figure 13. Modulus of elasticity vs porosity for various gypsum systems. [84]

Modulus of elasticity versus porosity curves for Reg Set cement
paste hydrated in the presence of CaCl are all higher than the curve for Reg
2
Set cement paste with 0% CaCl . All curves for Reg Set cement paste are
2
below the curve for hydrated portland cement paste.
Whilst the microhardness values of hydrated portland cement paste
lie between those for Reg Set cement paste with 2 and 5% CaCl , the
2
modulus of elasticity values for hydrated portland cement paste are higher
than for any of the Reg Set cement pastes. It is suggested that the processes
of microstructural deformation occurring in microhardness and modulus of
elasticity measurements are influenced in different ways by bond formation
during the hydration of Reg Set cement in the presence of CaCl .
2