Page 27 - ConcreCem - State of the Art

In figure 10.2 the samples after testing for the compressive strength is shown and figure 10.3 after tensile splitting strength. On the left picture of figure 10.3, the impression of the timber board is visible. Because of the fibres and ConcreCem the cube isn’t split in two halves.
Figure 10.2: compressive strength Figure 10.3: Tensile splitting strength
Table 10.1 describes the results of the compressive strength and the tensile splitting strength.
Table 10.1: Density, compressive strength and tensile splitting strength cubes (EN 12390-3 / EN 12390-6)
samples
date
D
Ac
Fc
fc
F
Fct
prepared
tested
[kg/m3]
[mm2]
[kN]
[N/mm2]
[kN]
[N/mm2]
1 19-12-08
2 19-12-08
3 19-12-08
Remarks:
22 hr 28 d 28 d
20-12-09 16-01-09 16-01-09
2440
2360
2380 -
777,9 78,0 - - 1181,3 120,0 - -
9993 9850
- - 258,0
16,35
Rate of load tensile splitting strength: 0,04 – 0,06 MPa/s D: Density samples [kg/m3]
F: Maximum tensile splitting load at failure [kN]
Fct: Flexural strength [N/mm2]
10.2 Mix C150
CEM I 52,5R
ConcreCem (0,3% by mass of cement)
Silica Fume
Quartsfiller
Water
Super plasticiser, ACE 30, con. 30%
Crushed sand 0/1
Steel fibres (OL13/.16)
Water / binder ratio
Density
Estimated compressive strength (after 28 days)
Rate of load compressive strength: 0,2 – 1,0 MPa/s
Ac: Cross-sectional area samples
Fc: Maximum compressive load at failure [kN] fc: Compressive strength [N/mm2]
981 2,94 216 325 178 92 472 196 0,21 2470 150 MPa
Material
Amount of material in 1 m3 concrete [kg]
The way of mixing the different materials is very critical. The following procedure was used: - Sand + Cement + ConcreCem
- Mixing for 1 minute
- Adding water + super plasticizer
- Mixing for 1 minute - Adding Silica Fume
- Mixing for 2 minutes - Adding Quarts filler
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