1. PRODUCTION AND SPECIAL PURPOSE
Agitator Self Compacting Grout (SCC)
PRIOVOLOS GEORGE
MSc-PHYSICIST- LABORATORY SCIENTIST
In May 2009, the site of the project "CONSTRUCTION GROUP THRIASSIOU field
(ALEITOURGIKI PHASE / AD 540)" which is supervised by ERGOSE SA and performed by the
technical MOCHLOS SA created the need
for the production and laying of a special
type of grout, really Pioneers
I hear the Greek data, both in
production and in terms of its
implementation. This grout should be
placed in the gap Slab Track System FF-
BŐGL
which formed on the horizontal axis,
after altitude placing special precast
slabs System Fixed superstructure (SRA)
of the German
Slab Track System FF-BŐGL
subcontractor company MAX BŐGL, which also possessed the related patent. For this reason
requested by the Department to proceed with the investigation of the above request and
submit his proposals.
The first step was to study thoroughly the manufacturer's manual subcontractor CRS (MAX
BŐGL 4.4.9. Grouting) and checked all the parameters. As explicitly stated in the manual,
should be produced on the spot a special type of grout with the following characteristics:
- Type of concrete: Self Compacting Concrete (SCC)
- Concrete strength: C 20/25
- Type of cement: CEM II
- Ground water - cement: ≦ 0,60
- Consistency: 790 - 830 mm (test spread through reverse cone slump)
- Criterion sedimentation: ≦ 20%
- Working time: 2.5 hours
- Total amount of detailed: 550 - 600 kg / m³
- Classroom exposure to frost (EN 206-1:2000): XF 1
- Idle: 0 - 2 mm (not crushed sand - preferably with spherical)
- Index swelling: ≦ 1%

2. The first problem that should
solve was finding a suitable inert
to the characteristics
HF required by the Directives
and the Greek KTS97. After
extensive research and techno-
economic criteria respectively
selected natural sand from the
river 'Selinountas Aegio "the
gradation of which is shown in
Table 1
Table 1
Given the limited use of this type of concrete in our country, there are no official Greek
literature instructions for producing such a product, but also generally for Self Compacting
Concrete (SCC), in addition to the draft Interim National Technical Specification 01.01.06.00.
00. (PETEP 01.01.06.00.00.) Institute of Economic Structures (IOK) which thankfully is fully
harmonized with the European standards. So PETEP in paragraph 3.1.2 defines as detailed all
particles smaller than 0,125 mm (ASTM No 120). As shown in Chart the passing rate of the
sand in a particular sieve did not exceed 3.22% of the dry weight. So this fact led us to the
idea of introducing the mixture of a silica fume
admixture which was no longer necessary for
the manufacture of the grout. After an
extensive search of the available Greek market,
determining the choice of Sikacrete ® UCS
company Admixture Test Laboratory
Sika Hellas SA which agrees with
PDS Code A 02 05 is a combination of active
hydraulic admixtures in a latent phase which
affect the thixotropy, consistency and
homogeneity of the mixture. Subsequently
became a well-depth research to identify other
additives to use in order to secure any required
Admixture Test at Laboratory
properties of the grout on the fluidity and workability. As known additives are not always
compatible with each other in parallel use. This means in practice that should be sufficient
test exposures with different combinations of admixtures and by different proportions.
Eventually we reached the combined use of superplasticizer concrete specific requirements
Sika ® ViscoCrete ® 5500 HP and the moderator
ΔΙΑΓΡΑΜΜΑ ΚΟΚΚΟΜΕΤΡΙΚΗΣ ΑΝΑΛΥΣΗΣ
0
10
20
30
40
50
60
70
80
90
100
0,01 0,10 1,00 10,00
ΑΝΟΙΓΜΑ ΒΡΟΧΙΔΟΣ (mm)%ΔΙΕΡΧΟΜΕΝΟ
ΔΕΙΓΜΑ

3. plasticizer SR 20, both products of
the company Sika Hellas SA. Based
on the large number of tests were
witnessed:
- The mixture was extremely
sensitive and prone to segregation
- Increased content of cement in
difficult processing because of high
temperature of hydration
Spread test inverted cone
- Very small changes in the quantities of
admixtures were fierce consequences in
appearance and consistency of the mixture
These observations from our laboratory,
confirmed by an independent laboratory
"EDAFOMICHANIKI ROI" which has been asked
to draw up formal study formula, as expressly
provided by the Contract Project. So in
collaboration with external laboratory and
after his own tests
we received the final mix design Failed Admixture
and had to move in Worksite application. For this purpose we considered that:
- It was imperative to use modern type mixer weighing with high-precision
- It was necessary to continually monitor all production processes and strict observance of all
rules are meant
- Due to the instability of the product
should be taken continuous
measurements of the properties of each
phase of work
So I had to take all measures to ensure
the production and laying of the product
with the properties proegrafan both
suggestions of the German company and
the mix design. June arrived in Athens
representatives MAX BŐGL and given the
sensitivity shown by the Germans as to
guarantee the conditions of application,
began a long period of confirmation of
Successful Admixture the results of

4. Our laboratory. Finally after repeated
tests it was decided to produce the
finished product in concrete production
units of ERGOBETON SA, which after
having been reviewed thoroughly to
ensure the conditions required by the
MAX BŐGL judged satisfactory
and others. Our laboratory had full
control of all the elements that should
be detected and the final result fully
satisfied both the Service Advisor
ERGOSE SA and the MAX BŐGL creating a
reference model for future
implementation in Southern Europe.
laying grout
Try grout Sampling
Sheet Control Concreting
References - Bibliography
- Temporary National Technical Specification 01.01.06.00.00.
- MAX BŐGL 4.4.9. Grouting
- Product Data Sheet of Sika Hellas SA
- Archives worksite Laboratory "MOCHLOS SA"