SiO2 | 72.5 - 75.8 |
TiO2 | 0.1 - 0.3 |
Al2O3 | 12.7- 14.1 |
Fe2O3 | 0.4- 1.1 |
FeO | 0.7- 1.8 |
MgO | 0.1- 0.9 |
CaO | 0.2- 1.0 |
Na2O | 2.9 - 5.4 |
K2O | 2.2 - 4.7 |
P2O5 | 0.1 - 0.2 |
pc * | 0.5 - 1.6 |
* Pc = loss by calcination | |
Physical and mechanical characteristics: | |
Bulk density | 2620 - 2660 Kg./mc. |
Coefficient imbizione | 2.99 - 3.00%. |
Compression breaking load of the specimens in their natural state: | |
With the load direction perpendicular to the schistosity | 133-213 MPa * |
With the direction of the load parallel to the schistosity | 76-186 MPa |
Breaking load in simple compression of specimens subjected to freeze-thaw cycles: | |
With the load direction perpendicular to the schistosity | 136-195 MPa |
With the direction of the load parallel to the schistosity | 84-113 MPa |
Tangent elastic modulus | 60360-67330 MPa |
Secant elastic modulus | 44650-48290 MPa |
Breaking load in traction in direct by bending | 19.1 - 23.7 MPa |
Frictional wear test: | |
Coefficient of abrasion to tribometer | 2:40 to 2:42 MPa |
Coefficient of abrasion reported to granite S. Fidelino | 0.90 |
Impact test failure: | |
Minimum height of fall | cm 70-90 |
coefficient of linear thermal expansion | 0.0033 mm / m ° C |
* 1 MPa = 10.2 Kg./cmq |
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