Test types and objectives.
In the experimental campaign conducted by the University of Alicante, our system and elements thereof, successfully they passed the detailed tests to determine their qualities. The flow test performed was carried out in the following order:
- Characterization of mechanical properties of the material.
- Chemical durability tests of aluminum.
- Mechanical characterization of isolated pieces of formwork and the connection between elements.
- Load test of a formwork system wrought subject to gravity loads.
- Load test formwork for vertical walls against the push fresh concrete.
Testing by direct traction.
Excellent resistance values, modulus and yield strength and elongation at break are obtained.
Chemical durability tests.
In conclusion thereof, it is recommended pretreating aluminum forms with an aqueous solution of calcium hydroxide (cal) at 20% by mass, which is capable of generating a surface layer of whitish color that reduces the intensity of dissolving base hydrolysis. That is, that the aluminum surfaces treated with said solution of calcium hydroxide are less reactive and less hydrogen gas release.
It demonstrated that the use of aluminum forms does not modify the main physicomechanical cement mortar (density, porosity, water absorption and mechanical compression resistance and flexural) properties compared to standard steel formworks.
Bend and flexure testing, pieces of wrought.
Wrougth formwork parts were tested with dimensions 1.20×1.20 m. The first tests with three-point bending, with a span of 1.10 m, and applying the load centered on a width of 80 cm. The test was repeated using a distributed load by sandbags.
EHE notes that on the underside of formwork not exist differences greater dimension than ± 20 mm before removing the struts. Service operation of the formwork would, in any of the scenarios considered, ensuring tolerances regulations with arrows below 10 mm.