|
Physical Stability |
Desirable |
Potentially Objectionable. |
|
Volume Stability |
Low compressibility |
High compressibility |
|
Density |
High |
Low |
|
Vuggines, |
Slight |
Very deeply vuggy |
|
Porosity |
Low porosity, compact |
High porosity |
|
Pore size and quality |
Few pores medium sized |
Many very large or extremely small pores |
|
Distribution of pores |
Even |
Uneven |
|
Permeability |
Low, impermeable |
High, permeable |
|
Water absorption |
Slight |
High |
|
Solubility in water |
Insoluble |
Soluble |
|
Sensitivity to Mater |
No significant volume change or disintegration on wetting |
Expands on wetting, flakes, disintegrates in eater |
|
Susceptibility to wetting and drying |
Resistant to disintegration due to wetting and drying cycles |
Disintegrates in water |
|
Susceptibility to freezing |
Low; high frost resistance |
High; low frost resistance and thawing |
|
Volume stability on heating and cooling |
Stable |
Unstable |
|
Coefficient of thermal |
High, compatible with that of cement paste |
Very low coefficient |
