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Technical Committee 307 /
Comité technique 307
value of the 7-day mixtures was observed as 38.4 while this
value was 78.9 for 28-day mixtures.
Figure 3. Cement, sand and glass foam mixture sample for the
unconfined compression test (Tuncel, 2012).
Figure 4. 7 and 28 days unconfined compression test results for the
samples with glass foam.
The aim of the laboratory study of lightweight fill that
consist of EPS-cement-sand mixture is investigation for its
usability in geotechnical applications successfully. So for the
solution of weak soils with low durability that have slope
stability problems, it is tried to create more durable and
compressible ligthweight soil than normal soils. The unit weight
of the EPS mixture was 3.80 kN/m
3
. Figure 5 shows the
unconfined compression test sample of EPS, sand and cement
mixture. Weight content of materials in mixture was selected, so
different proportions such as 100%, 75%, 50% and 25% of EPS
content of mixtures were prepared. To determine the ratio of
EPS in the cementious material mixture, where sufficient shear
strength is needed, unconfined compression tests were done.
Prepared mixture samples were tested, then relevant percentage
of expanded polystyrene content of material and
cement/material ratio of mixture was determined. The relevant
content of EPS in material is determined as 50% and ratio in
terms of weight for cement/material of mixture was measured as
12/1. Unconfined compression value of 7 day sample is 0.22
MPa and of 28 day EPS mixed samples is 0.42MPa. According
to the results, the mixture is defined as a low permeable
lightweight fill and it also has CBR value that can be classified
as medium. Figure 6 shows the results of these tests, as can be
seen from the figure with time the strength of the sample
increases.
Figure 5. Unconfined compression test sample of EPS, sand and cement
mixture (Ahmedov, 2012).
Figure 6. 7 and 28 days unconfined compression test results for the
samples with EPS foam.
CBR tests showed that the glass foam-sand-cement mixtures
have enough bearing capacity to be used as a subbase material.
CBR values for 28 days old EPS mixture is 7 making it weak to
be used as a subbase material. As a result, by producing
lightweight fills with CLSM mixture produced using glass
foam-sand-cement can be a solution for consolidation and
bearing capacity problems of very soft soils which continually
consolidate, constitution of geotechnical fills on potentially
sliding slopes and reducing the stress distribution on retaining
structures.
