Roadcem brochure - Lafarge in South Africa

CEMENT
Meeting the needs of the
road construction industry
Soil
stabilisation

LAFARGE
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CONTENTS
Soil stabilisation – an overview
Mechanism of cement stabilisation
Recommended cements
Optimum solutions for soil stabilisation
Innovative Lafarge design
Composition and benefits
Strength
Performance characteristics
Support services for road contractors
Load integrity of bulk deliveries
Bagged product deliveries
Caring for the environment
- Cementitious extenders and the environment
- Green Building Council
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About Lafarge in South Africa
- Technical resources
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Safety when handling cement
International Lafarge Group
Ordering made easy
PAGE 1 | LAFARGE | 2012

LAFARGE
Soil stabilisation – an overview
Soil stabilisation is used to overcome deficiencies in available road construction material
by enhancing the material properties for pavement design purposes.
Stabilisation products are designed to control the plasticity and enhance the strength of various road
making materials. The principal products used are lime, Portland cement, fly ash, slag or mixtures
of these to address the specific site conditions and conform to the applicable standards.
Cementitious stabilisation products
Cementitious products are suitable for granular soils where the soils are not reactive to lime but are
not recommended in heavy clay soils with a high Plasticity Index (PI).
Cementitious extenders
Fly ash and slag extended cements provide longer working time (open time) and slower strength gain
Benefits of cementitious products
Cementitious products make a positive contribution to economic and resource sustainability by
enhancing the properties of standard and substandard in situ soils to the standards required for road
making.
Recommended
cements for soil stabilisation
RoadCem is a specialised cementitious binder designed to meet the
needs of a wide range of road stabilisation applications. Depending on the
specific site conditions, the product is formulated from Portland cement,
siliceous fly ash and GGBS (slag).
RoadCem is suitable for:
• Stabilisation of road base, sub-base and sub-grade materials
• Soils with either low or moderate plasticity - it is especially suited
to granular type materials with a lower PI
• In situ (including deep lift) stabilisation or pugmill blending
• Minor general concrete work
Buildcrete is a versatile general purpose cement that has been used
successfully on a wide range of stabilisation projects. Extended with
siliceous fly ash, it provides:
• Slower strength gain in this application, giving considerably more
time than CEM I cement for construction purposes
• Improved ultimate Unconfined Compresssive Strength (UCS) and
Indirect Tensile Strength (ITS) of stabilised soils
Mechanism of
cement stabilisation
Cement is effective in stabilising a wide range soils including granular
materials, silts and light clays. A particular advantage of cement is its
capability of being used in conjunction with by-products such as fly ash
and slag.
Cement is composed of calcium silicates and calcium aluminates that
hydrate when combined with water to form the cementing compounds of
calcium silicate hydrate and calcium aluminate hydrate. The reaction also
releases calcium hydroxide (Portlandite). The formation of the cementitious
products and calcium hydroxide make Portland cement successful in
stabilising both granular and fine-grained soils, as well as aggregates and
miscellaneous materials.
In fine-grained clay soils, a pozzolanic reaction between the calcium
hydroxide released during hydration and the alumina and silica in the soils,
is an important factor in the stabilisation of these clay soils.
The permeability of cement stabilised soil is greatly reduced. The result
is a moisture-resistant material that is highly durable and resistant to
leaching over the long term.
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LAFARGE
Optimum solutions for soil stabilisation
The Lafarge range of roadbinding cements offers road project contractors a choice of reliable, quality
performance products, which provide the optimum solution to their soil stabilisation requirements.
The products stabilise soils by reducing the Plasticity Index (PI), while also improving the Unconfined
Compressive Strength (UCS) and Initial Tensile Strength (ITS).
Innovative Lafarge design
The unequalled technical resources of Lafarge provide road contractors
with formulations that offer superior all-round performance and better
value:
• Slow-setting cementitious binders with extended working time in
road stabilisation
• Effective in reducing the Plasticity Index of a wide range of paving
materials
• Formulation options to match the challenges of different soil
conditions
• Superior long-term strength
• Excellent workability for uniform finished surface
• Quality and reliability of a Lafarge brand
• Lower carbon footprint formulations that aid compliance with
environmental specifications
Composition and benefits
Lafarge roadbinding products are formulated
to conform to the SANS 50197 (EN 197)
specifications in accordance with SANS 50196
(EN 196) test requirements and are designed to
meet commonly encountered road stabilisation
requirements.
RoadCem CEM II/B-M (V-S) 32,5N is a slowsetting
cementitious binder produced at the
Lafarge Randfontein Grinding Station (on the
west side of Johannesburg) from Portland
cement, siliceous fly ash and slag. The product
provides:
• Slower early rate of strength development,
allowing considerably more time for
construction operations
• Extra ability to self-heal, in the event of
early-life damage caused by overloading
• In the long term, an increased strength
that improves the structural performance
Buildcrete CEM IV/B-V 32,5R
The well-known Lafarge Buildcrete general
purpose cement is produced at the Lafarge
Lichtenburg Cement Works in the North West
Province and at the Randfontein Grinding
Station, from Portland cement and fly ash. This
versatile ‘R’ class cement has a relatively slower
strength gain compared with CEM I cements for
soil stabilisation purposes. Buildcrete offers:
• Slower strength gain than nonextended
products, giving more time for
construction operations
• Higher ultimate strength and improved
durability of the stabilised soil layer
• Good self-healing ability, in the event of
early-life damage caused by overloading
Innovative extended formulations
Lafarge Cement’s innovative formulations using quality cementitious extenders provide customers
with all-round benefits:
• Assist contractors in meeting the increasingly common and stringent environmental
specifications in construction tenders
• The extenders react chemically with traditional materials enhancing the strength and
durability of the finished product
Strength
• RoadCem achieves strengths at 7 days >16,0MPa (megapascals) and at 28 days >32,5MPa,
as required for this class of general purpose cement in accordance with the regulated
standard SANS EN 50197-1
• Buildcrete complies with the requirement in the SANS specifications for a minimum
compressive strength >32,5MPa (EN prism test using a water/cement ratio of 0,5) within 28
days of casting. The ‘R’ classification indicates that Buildcrete will achieve an early strength
at 2 days >10,0MPa in accordance with the SANS specifications
(An ‘N’ designation refers to a class with ordinary early strength development.)
Performance characteristics
Lafarge roadbinding cements are designed to provide optimal solutions for improving the engineering
properties of soil, giving the following advantages:
• Strength - soil strength and bearing capacity are increased
• Volume stability - controls the swell and shrinkage characteristics caused by moisture
changes
• Durability - increases resistance to erosion, weathering or traffic loading
• Modification of clay minerals – enhances the soil strength and bearing capacity
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LAFARGE
Support services for
road contractors
Mix design
It is essential that soil conditions are evaluated
and all materials are tested in order to determine
the appropriate stabilisation agent to achieve
the specified properties of the stabilised road
e.g. ITS and UCS.
Evaluation of soil
Our Quality Department Southern Africa (QDSA)
has a fully-fledged soil laboratory where customer
soil evaluations are conducted.
Site inspection
Before any order is executed, whether of bulk
or bagged product, Lafarge will carry out a site
inspection to ensure the delivery and offloading
can be done safely.
Delivery options
Our delivery service aims to meet the needs of
any road project:
• RoadCem is delivered by bulk tanker with
the option of a spreading service, or in
palletised loads of 50kg bags
• Buildcrete is delivered in palletised loads
of 50kg bags
• Under our brand name Civilcrete,
Buildcrete is also delivered by bulk tanker
with the option of a spreading service
Load integrity of BULK deliveries
A vitally important aspect of bulk deliveries is ensuring the integrity of the
load when it is handed over at the delivery point. We address this in two
ways that reinforce each other:
• Bulk Tanker Seal
Each load is sealed with a white seal bearing a unique tracing
number that appears on the delivery note. The delivery note
states comprehensive details of the order and product identity.
• Bulk Product Identification Tag
For easy identification of your Lafarge bulk cement delivery we have a
system that requires all discharge valves on our road tankers to carry
a colour coded and descriptive Product Identification Tag.
Our Tags will allow the road construction
contractor’s personnel to quickly and
easily reassure themselves that they have
the correct product for that section of
road.
CEM IV/B-V 32,5R
General Purpose Cement
Please note:
The Lafarge Product Identification Tags are intended to help customers
conveniently and efficiently handle bulk tankers on site. The tags do not
represent a product guarantee. A secure, unbroken white Bulk Tanker Seal
is the guarantee of the integrity of the load.
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LAFARGE
Bagged product
deliveries
What the bag marks tell you:
RoadCem and Buildcrete - Lafarge brands
of roadbinding cements, with a low carbon
footprints:
• 32,5N
achieves a strength of at least 32,5MPa
at 28 days under standard test
conditions
• LOA number
Lafarge is authorised to sell RoadCem
and Buildcrete in the South African
market as it more than meet the
necessary regulatory requirements.
It is mandatory to display a Letter of
Authority (LOA) number on a bag of
cement and on the sale transaction
documentation
• SABS mark
Indicates that RoadCem and Buildcrete
comply with the compulsory standard
in the SANS 50197 (EN 197)
specifications. Although displaying the
SABS mark is no longer mandatory,
Lafarge Cement voluntarily displays it
• e-mark
Indicates that the packaging equipment
and systems at our Lichtenburg Cement
Works have been audited and approved
by the NRCS and comply with the
SANS 1841 standard. Our customers
are assured of receiving the quantity for
which they have paid
Caring for the
environment
Lafarge Cement believes that it has a responsibility
to use raw material resources wisely and in the
most environmentally-friendly way possible.
Every ton of cement replaced by cementitious
extenders such as fly ash and slag reduces energy
consumption in cement manufacture and preserves
non-renewable mineral resources.
Lafarge Cement was the first company in
South Africa to offer customers a full range of
extended environmentally-friendly cements, with
lower carbon footprints.
Cementitious extenders
and the environment:
Fly ash and slag are environmentally-friendly
products. Lafarge Cement’s innovative use of
cementitious extenders as a component of building
materials is making a significant contribution to
sustainable development by:
• Reducing the use of non-renewable
resources
• Reducing carbon dioxide emissions from
cement plants
• Recycling by-products of coal burning
power stations and blast furnaces, which
cuts back on the landfill sites
Green Building Council
Lafarge Cement was the first member of the building
materials industry to join the Green Building Council
of South Africa (GBCSA). It is a commitment to
assist the Council in leading the transformation of
the South African property industry to ensure that
all buildings are designed, built and operated in
an environmentally sustainable way. The aim is to
allow all people in our country to work and live in
healthy, efficient and productive environments.
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LAFARGE
About Lafarge in
South Africa
Lafarge is a leading supplier of building materials
to the South African construction industry through
its two main operating companies:
• Lafarge Industries South Africa (Pty) Ltd,
(which includes the cement, readymix
concrete and the gypsum-plasterboard
operations)
• Lafarge Mining South Africa (Pty)
Ltd (which covers the aggregate and
limestone quarrying interests).
SAFETY WHEN HANDLING CEMENT
Before starting any job, make safety the
first step in your planning.
Cement is such a commonly available product that many people use
it without giving any thought to personal protection. It is important
to take sensible handling precautions:
• Always wear protective clothing, boots, gloves and safety glasses
• Wash cement off skin immediately with water and mild soap
• Thoroughly rinse any cement in eyes with water and seek
medical attention if irritation persists
• Keep a straight back and bend at the knees when lifting bags of
cement
The companies trade as Lafarge Cement, Lafarge
Aggregates, Lafarge Readymix and Lafarge Gypsum.
Right Way
WRONG Way
Technical resources
Lafarge roadbinding cements are fully supported
by the unique technical and laboratory resources
of Quality Department Southern Africa (QDSA)
at Industria, Gauteng. QDSA operates one of the
largest and most respected SANAS (South African
National Accreditation System) Accredited Civil
Engineering testing facilities in South Africa.
Complying with ISO/IEC 17025, the facility has
a proud sixteen-year track record of continuous
accreditation.
Scope of QDSA’s Accreditation
The SANAS accreditation covers thirty-five
test methods, including all the SANS EN
tests for Common and Masonry cements,
other relevant SANS, EN and DIN test
methods for aggregates and concrete, as well
as an in-house method for Dense Medium
Separation. Within the framework of this
accreditation, QDSA can add another 200
tests to the above methods.
For further information, Safety Data sheets are available from:
• Your local building materials supplier
• Lafarge Cement Customer Care: 011 657 1010
• Lafarge website: www.lafarge.co.za
THE INTERNATIONAL
LAFARGE GROUP
Lafarge is the world-leader in building materials, with top-ranking
positions in its Cement, Aggregates & Concrete businesses. The Group
has 68 000 employees in 64 countries and, in 2011, posted sales of
15,3 billion Euros.
For the second year in a row, Lafarge ranked amongst the Top 10 of 500
companies evaluated by the “Carbon Disclosure Project” in recognition
of their strategy and actions against global warming. With the world’s
leading building materials research facility, Lafarge places innovation
at the heart of its priorities, working for sustainable construction and
architectual creativity.
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LAFARGE
Leading through innovation
Lafarge has continually invested in the better
understanding of cement and in advancing
the development of building materials. It
offers the construction industry and the
general public innovative solutions bringing
greater safety, comfort and quality to their
everyday surroundings.
Additional information is available on the
website at: www.lafarge.co.za
Ordering
made easy
If you have registered to use the Lafarge
Customer Portal, ordering cement can be
done at your convenience, 24 hours a day,
365 days a year.
For further information or to register to use
our Customer Portal, please contact:
• Your local Lafarge Sales Representative
• Customer Care: 011 657 1010 or
• Download an Application form from our
website: www.lafarge.co.za
FOR ALL YOUR ROADBINDING CEMENT
QUERIES PHONE:
Toll Free: 0860 109 275
Call Centre: 011 657 1111
Customer Care: 011 657 1010
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Lafarge Industries South Africa (Pty) Ltd
35 Westfield Road
Longmeadow Business Estate Ext 11, Edenvale, 1609
Tel no.: 0860 LAFARG / 0860 523 274
or 0861 LAFARG / 0861 523 274
Main fax no.: 086 631 0006
www.lafarge.co.za