Page 17 - Harbour Sludge Stabilisation.pdf

4. 4 point and 2 pint bending tests on samples prepared with ImmoCem 35/3,0

4.1 Material

The specimen beams for the tests were prepared as follows:

50% (m/m) ports silt,

50% (m/m) sort sand (sieved on 0.8 mm)

The above were combined and mixed well and then the binder consisting of :

32% (m/m) fly ash

3.0 % (m/m) ImmoCem

65 % (m/m) Cement CEM I 52.5 R

at a dose of 35 % (m/m) was added):

4.2 Test pieces

The sample beams with the above mix were prepared on 12-5-2008 (500*100*100 mm) in steel moulds and
provided to TU Delft research team on 28-5-2008. On 9-6-2008, at the age of 28 days the test beam was cut
into 4 test pieces for the fatigue research with 4-point load cell. The location of the test pieces on the
original beam was recorded.

The density of the test pieces immediately after cutting ranged from 1447 to 1465 kg/m3. After 14 days of
drying the density ranged 1375 up to 1406 kg/m3. It is noted that the density of the two sample pieces from
the top side of the original beam was 30 kg/m3 higher than the density of the two test pieces from the
bottom of the original beam.

Comparison of the densities of the ImmoCem 35/0,3 test pieces with the density of ImmoCem 35/3,0 test
pieces (table 2) shows that the later are significantly lower. The reason for this is the presence of higher
amount of polystyrene granules in the second set of samples.

Specimen Location Length, Width, Height, Half day after sawing 23.06.2008

on the mm mm mm Weight, g Semi wet Weight, Dry
original Density. gr Density.
sample Kg/m3 Kg/m3

1 top 451.00 47.12 48.14 1498.40 1465 1438.20 1406
2 top 450.50 47.93 48.14 1522.40 1465 1461.50 1406
3 bottom 450.50 47.22 47.07 1448.8 1447 1378.20 1376

4 bottom 451.00 47.68 47.32 1476.30 1451 1399.10 1375
Table 4. Dimension and compactness of the test pieces ImmoCem 35/3,0.

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