Fosroc Structuro W425 constructive solutions
A Superior high performance concrete hyperplasticiser
based on polycarboxylate technology
Uses Structuro W425 combines the properties of water reduction
and workability retention. It allows the production of high
Structuro W425 is a high performance hyperplasticiser
performance concrete and/or concrete with high workability.
intended for applications where high workability retention
with increased early and ultimate compressive strengths are Structuro W425 is a particularly strong hyperplasticiser
required, and it has been developed for use in: allowing production of consistent concrete properties around
the required dosage.
! Self compacting concrete
! Pumped concrete Technical support
! Concrete requiring long workability retention
Fosroc provides a technical advisory service for on-site
! High performance concrete assistance and advice on admixture selection, evaluation
! Pre-cast concrete trials and dispensing equipment. Technical data and
guidance can be provided for admixtures and other products
Advantages for use with fresh and hardened concrete.
! Increased early and ultimate compressive strengths
Typical Properties
! Increased flexural strength
Appearance : Light yellow coloured liquid
! Improved adhesion to reinforcing and stressing steel
Specific gravity : 1.06 @ 25°C
! Improved resistance to carbonation Chloride content : Nil to BS 5075 / BS:EN934
! Lower permeability
Typical Dosage
! Increased resistance to aggressive atmospheric
The optimum dosage of Structuro W425 to meet specific
conditions
requirements should always be determined by trials using
! Reduced shrinkage and creep the materials and conditions that will be experienced in use.
The normal dosage range is between 0.2 to 2.0 litres/100 kg
! Increased durability
of cementitious material.
Standards compliance Use at other dosages
Structuro W425 conforms with BS 5075, BS:EN 934-2 and Dosages outside the normal range quoted above can be
with ASTM C494 as Type F and G. used to meet particular mix requirements. Contact Fosroc
for advice in these cases.
Description
Effects of overdosing
Structuro W425 is differentiated from conventional
superplasticisers in that it is based on a unique carboxylic Overdosage may cause delay in the setting time.
ether polymer with long lateral chains. This greatly improves
cement dispersion. At the start of the mixing process an
electrocstatic dispersion occurs but the presence of the lateral
chains, linked to the polymer backbone, generate a steric
hindrance which stabilises the cement particle’s capacity to
separate and disperse. This mechanism considerably
reduces the water demand in flowable concrete.
Structuro W425
Fosroc Structuro W425
Instructions for use Storage
Compatibility Structuro W425 has a minimum shelf life of 12 months
provided the temperature is kept within the range of 2°C to
Structuro W425 should not be used in conjuntion with any
50°C. Should the temperature of the product fall outside this
other admixture unless prior approval is obtained from your
range then contact Fosroc for advice.
local Fosroc office.
Structuro W425 is suitable for use with all types of Portland Precautions
cements and cement replacement materials such as PFA,
Health and safety
GGBFS, SRC and microsilica.
Structuro W425 does not fall into the hazard classifications of
Mixing
current regulations. However, it should not be swallowed or
When used at the mixing plant, Structuro W425 should be allowed to come into contact with skin and eyes.
added in the mixing water. Suitable protective gloves and goggles should be worn.
In some instances, e.g. addition to ready mix concrete on Splashes on the skin should be removed with water. In case
site, Structuro W425 can be added directly in the truck mixer of contact with eyes rinse immediately with plenty of water
and mixed at maximum speed for an extra 5 minutes. and seek medical advice. If swallowed seek medical attention
For Self compacting concrete, a viscosity enhancer eg. immediately - do not induce vomiting.
Structuro 480* is recommended at a dosage between For further information consult the Material Safety Data Sheet
1.0 - 4.0 litre per cubic metre. available for this product.
Dispensing Fire
The correct quantity of Structuro W425 should be measured Structuro W425 is water based and non-flammable.
by means of a recommended dispenser. The admixture
should then be added to the concrete with the mixing water to Cleaning and disposal
obtain the best results. Contact Fosroc for advice regarding Spillages of Structuro W425 should be absorbed onto sand,
suitable equipment and its installation. earth or vermiculite and transferred to suitable containers.
Remnants should be hosed down with large quantities of
Estimating water.
Supply The disposal of excess or waste material should be carried
Structuro W425 out in accordance with local legislation under the guidance
1000 litre totes of the local waste regulatory authority.
For larger users, storage tanks can be supplied.
* Denotes the trademark of Fosroc International Limited
†
See separate data sheet
Important note
Fosroc products are guaranteed against defective materials and manufacture and are sold subject to its standard Conditions for
the Supply of Goods and Service. All Fosroc datasheets are updated on a regular basis. It is the user’s responsibility to
obtain the latest version.
Head Office
telephone: (+9714) 2039699 fax: (+9714) 2859649 email: agf@fosroc.com
Al Gurg Fosroc LLC
Regional offices
Post Box 657, Dubai Abu Dhabi, Al Gurg Fosroc telephone: 673 1779 fax: 673 1449 email: abudhabi@fosroc.com
United Arab Emirates Bahrain, YBA Kanoo telephone: 17738200 fax: 17732828 email: bahrain@fosroc.com
Kuwait, Boodai telephone: 4817618 fax: 4832124 email: kuwait@fosroc.com
www.fosroc.com
Oman, Al Amana telephone: 24815080 fax: 24817554 email: oman@fosroc.com
Qatar, Tadmur telephone: 4665501 fax: 4664147 email: qatar@fosroc.com
UAE/0657/09/A
