Cov khoom siv uas yuav tsum tau xav txog thaum xaiv lub rooj muag muag yog
1) Cov kua dej sib xws, suav nrog o, poob ntawm hardness, permeability, degradation;
2) hardness;
3) Permanent deformation;
4) Cov qib kev rov qab los tom qab tshem tawm;
5) Tensile thiab compressive zog;
6) Deformation ua ntej rupture;
7) Modulus ntawm elasticity.
