Glenium™27CH
New generation high range water reducing admixture primarily developed for ready-mix concrete
industry where slump retention, high strength and durability are required in hot climate
Description and where to use
Benefits
GLENIUM 27 - CH is a new generation high range • Rheoplastic concrete with the lowest
water reducing admixture, based on chains of water/cement ratio;
modified polycarboxlic ether, primarily developed • no segregation or bleeding;
for ready-mix concrete industry where slump • low vibration time required even in case of high
retention, high strength and durability1 are required reinforced concrete;
in hot climate. • excellent surface appearance;
The excellent dispersion effect makes GLENIUM 27 • compared to traditional superplasticizers (based
- CH the ideal admixture for the ready-mix concrete on NSF or MSF2), GLENIUM 27 - CH reduces
industry. The ability to work with very low risks of retempering concrete on job site with
water/cement ratio and still obtain extended slump additional water
retention allows for the manufacture of high quality even in hot climate; compared to traditional
concrete as the risk of addition of mixing water. superplasticizers (based on NSF or MSF2),
GLENIUM 27 - CH improves the engineering
properties of concrete like early and ultimate
26
strengths, modulus of elasticity; bond strength to
24
22 A steel, depths of carbonation, impermeability,
20 resistance to chemical aggressive agents1,
B
SLUMP, cm
18
shrinkage and creep.
16
14
12 The new chemistry of Glenium 27-CH
10
What differentiates GLENIUM 27- CH from the
8
6 traditional high range water reducing (based on
0 30 60 90
M IN U T E S
120 15 0 18 0
NSF or MSF2), with good workability is a new,
unique mechanism of action that greatly improves
the effectiveness of cement dispersion. Traditional
Figure 1: Typical slump retention. Concrete high range water reducing like melamine and
manufactured with GLENIUM 27 - CH according to: naphthalene sulfonates are based on polymers
A. water/cement ratio = 0.55; 270 kg CEM II AL which are absorbed by the cement granules. They
42.5 R; Dmax = 25.4 mm; T = 30 °C; wrap around the granules surface areas at the very
B. water/cement ratio = 0.45; 350 kg CEM II AL early stage of the concrete mixing process. The
42.5 R; Dmax = 25.4 mm; T = 25 °C sulphonic groups of the polymer
GLENIUM 27 - CH is free of chloride, meets ASTM
C 494 requirements for Type A and Type F and it is
also compatible with all cements meeting the ENV
197 and ASTM standards.
Quantity to use
The new chemistry of Glenium 27-CH
What differentiates GLENIUM 27 - CH from the The normally recommended dosage rate is 0.5 –
traditional high range water reducing (based on 1.5 Litre per 100 kg of binder. It is recommended
NSF or MSF2), with good workability is a new, that tests are carried out to optimise dosage rates
unique mechanism of action that greatly improves with different cement types. In these cases please
the effectiveness of cement dispersion. Traditional consult our Technical Service Department for
high range water reducing like melamine and advice.
naphthalene sulfonates are based on polymers
which are absorbed by the cement granules. They Directions for use
wrap around the granules surface areas at the very The best method to use GLENIUM 27 – CH is as
early stage of the concrete mixing process. The follows:
sulphonic groups of the polymer chains increase
the negative charge of the cement particle surface 1. Mix cement and secondary binders, sand,
and disperse these particles by electrical repulsion. coarse aggregates and the mix water until a stiff,
This electrostatic mechanism causes the cement yet homogeneous, mixture is obtained. Optimal
paste to disperse and has the positive mixing water reduction is obtained if GLENIUM
consequence of requiring less mixing water to 27 - CH is poured into the concrete mix right
obtain a given concrete workability. Hydration after the addition of the first 50-70% of the
however starts as soon as the cement particles get mixing water. Avoid adding the admixture to the
in contact with mixing water. The rapid growth of dry aggregates.
hydration crystals will change the surface
mechanical of the particles and thus of set the free 2. Add GLENIUM 27 - CH admixture and mix again
dispersion of them. GLENIUM 27 - CH has a for to 60 seconds in order to disperse it
different chemical structure from the traditional high homogeneously
range water reducing. It consists of a carboxylic
ether polymer with long side chains. At the 3. Continue mixing until required workability is
beginning of the mixing process it initiates the same obtained.
electrostatic dispersion mechanism as the
traditional high range water reducing, but the side Best performance is obtained in the production
chains linked to the polymer backbone generate a of very flowable concrete in the slump range of
steric hindrance which greatly stabilises the cement 20-25 cm. Since GLENIUM 27 - CH admixture
particles ability to separate and disperse. With this is designed for the production of very high
process, flowable concrete with greatly reduced quality concrete, the cement content may be
water content is obtained. The alkalinity created by relatively high.
the cement paste allows the polymers of GLENIUM
27 - CH to “open up and progressively release” Compatibility
many additional polymer chains that will prevent the In order to optimise special requirements the
early flocculation or stiffening of the mix. This use of the following complementary additives is
mechanism allows to obtain, compared to suggested:
traditional retarding high water reducing
admixtures, considerably longer workability, • air entraining agent MICRO AIR 300 to improve
reduction of mixing water content and higher early frost/thaw resistance1 (exposure classes type
strengths. 2b, 3 and 4b according ENV 206);
• silica fume MEYCO MS610 for high Packaging & temperature precaution
performance concrete and improve durability in GLENIUM 27 - CH is available in 208 litre
chemical aggressive environments1 (exposure drums, 1000 litre container or in bulk. GLENIUM
classes type 3, 4 and 5 according ENV 206) ; 27 - CH must be stored in a place where the
• expanding agent RHEOMAC100 formerly temperature does not drop below 5 °C.
STABILMAC, for shrinkage compensating
concrete; If GLENIUM 27 - CH admixture has frozen, thaw
• synthetic fibres RICEM to prevent cracks due at 7 °C or above and completely reconstitute by
to plastic shrinkage; mild mechanical agitation.
• curing agent MACKURE C against too quick Do not use pressurised air for agitation!
evaporation of mixing water.
The use of fly ash, silica fume, or slag is also GLENIUM 27 - CH is not compatible with all
beneficial in the production of self-levelling and admixtures of RHEOBUILD series.
very cohesive concrete.
Whilst any information contained herein is true, accurate and represents our best knowledge and experience, no warranty is given
or implied with any recommendations made by us, our representatives or distributors, as the conditions of use and the competence
of any labour involved in the application are beyond our control.
As all BASF’s technical datasheets are updated on a regular basis it is the user's responsibility to obtain the most recent issue.
BASF Construction Chemicals S.A. (Pty) Ltd
P.O. Box 420, Westonaria, 1780 61 Brunton Circle, Founders Hill, Modderfontein,
11 Pullinger Street, Westonaria, 1779 1645
Tel: +27 11 754 1343 P O Box 75845, Garden View, 2047
Fax: +27 11 754 1105 Phone +27-11-452 6557
e-mail: basfcc@mweb.co.za Fax +27-11-452 3595
e-mail: basfcc@mweb.co.za
