GRP tubes are made of thermoset polyester resin reinforced with continuous glass fibers. The external surface is roughened for improved pull resistance. “Micropile foundation reinforced with GFRP composite tube with internal improved adherence to improve the overall characteristics of the foundation”
ø out
(mm) |
Thickness
(mm) |
A-tube
(cm2) |
We
(cm3) |
Je
(cm4) |
E
(kg/cm2) |
Weight
(kg/ml) |
Elastic modulus
(kg*cm2) |
| 280 |
10 |
84,82 |
553 |
7740 |
350000 |
16,9 |
2,7E+09 |
| 200 |
10 |
59,69 |
270 |
2701 |
350000 |
11,9 |
9,5E+08 |
| 200 |
15 |
87,18 |
375 |
3754 |
350000 |
17,4 |
1,3E+09 |
| 200 |
20 |
113,10 |
464 |
4637 |
350000 |
22,6 |
1,6E+09 |
| 180 |
20 |
100,53 |
363 |
3267 |
350000 |
20,1 |
1,1E+09 |
| 160 |
14 |
64,21 |
216 |
1727 |
350000 |
12,8 |
6,0E+08 |
| Physical-Mechanical Characteristics of Composite |
| Qmax at ongitudinal at break (ASTM D 790) |
600 MPa |
| Tmax at Shear at break (ASTM D 4475) |
35 MPa |
| Longitudinal Elastic Modulus |
35 GPa |
| Limit deformation (Ɛr) |
1,7% |
| Volumetric mass |
2 gr/cm3 |
The steel micropile in the berliners can be replaced with GRP micropiles, which offer better corrosion resistance, are easier to demolish, and are easier to transport and handle due to the reduced weight.