Structural floor slab certified with chemical connection
In order to characterize the consolidation system described above, Olympus has carried out an experimental test campaign & nbsp; on 1: 1 scale floors.
Two brick floors have been created, one with the system to be tested and one without, having the following physico-mechanical characteristics:
- Dimension 4.5x2m
- Rck: 18 N/mm2
- Fyk: 450 N/mm2
- Beam dimension: 10x16cm
- Distance between beams: 50cm
- Concrete cover: 2cm
- Joist reinforcement: 2φ10 at the bottom, 1φ10 at the top
- Rapid structural screed: 4cm
Laterocement floors have been created with mechanical characteristics of the constituent elements described above, as they are the most widespread in existing buildings on the national territory.
The characterization of the system at the laboratories of Istituto Giordano SpA
In order to characterize the consolidation system described above, Olympus® has carried out an experimental test campaign at the Istituto Giordano Spa laboratories on 1: 1 scale floors.
The objective of the experimentation is to determine the actual increase in the useful capacity of the floor, thanks to the contribution of the rapid structural screed slab.
Two brick cement floors have been created, one with the system to be tested and one without, having the following physical-mechanical characteristics and with mechanical characteristics of the constituent elements described above, as they are the most widespread in existing construction on the national territory.
Evidence description
To carry out the test, both floors were subjected to theoretical maximum load and evaluated at the SLU. The verification is then carried out in step 3. A diagram of the load arrangement and the displacement measuring instruments T1 and T2 is illustrated.
Load test scheme
As the load P of the actuator increases, a cracking panorama is observed with triggering of the cracks in the lower flap, which initially develop in the vertical direction in the middle and slowly take a 45 degree direction in the supports where there is a maximum cut value.
Interpretation of the results obtained
It is easy to read as at the same load in the condition of the floor with and without reinforcement as the behavior changes in terms of resistance and stiffness.
In particular, starting from the non-reinforced floor, it is observed that by increasing the load, at the value of 30kn the first cracks with the average value of the arrow in the middle of 45.61mm are recorded and at 43.5 kN the maximum load is recorded bearable by the attic with an arrow value of 100.48mm in which
The floor is in a plastic deformation phase and records a residual deformation equal to a value of 52.20mm at the time of the cancellation of the load. By analyzing the behavior of the floor reinforced with Olympus® rapid structural screed slab, it is observed that for 30kN there are no cracks and the arrow has an average value of 20.58mm.
In the same way, at 43.5kn there are no cracks that begin to manifest at 57.5kn in which the value of the arrow in the centerline is equal to 42.20mm but we are not yet in the plastic phase.
The breaking of the reinforced floor is reached at 83kN, equal to double the non-reinforced floor, in which there is a lowering in the middle of 104.81mm and a residual deformation equal to 50.67mm to release the load.
Comparison in terms of stiffness
The stiffness increase of the reinforced floor screed with Olympus® rapid structural screed is clearly evident from the comparison of the deformation of the floor with the same load,
considering the value of the breaking load of the unreinforced floor 43.5 kN as a control parameter:
- Deformation of the unreinforced floor slab: 100.48 mm
- Deformation of the floor slab reinforced with the OLYMPUSFLOOR® system: 29.44 mm
The stiffness of the reinforced floor is 300% Compared to the unreinforced floor
Comparison in terms of resistance
The increase in resistance of the slab reinforced with Olympus® rapid structural screed system is clearly evident from the comparison of the parameters of resistance to breakage:
- Failure of the unreinforced floor slab: 43.5 kN
- Deformation of the floor slab reinforced with the OLYMPUS FLOOR® system: 83.5 kN
The resistance of the reinforced floor is 200% Compared to the unreinforced floor
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