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constructive solutions

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Renderoc S

Polymer Modified Structural Grade Repair

Mortar

Uses

Renderoc S is suitable for hand application to repairs

where significant load bearing is required, typical

applications would include;

Vertical and overhead repairs

Patch repairs to concrete floor slabs

Patch repairs to stairs, steps and other areas subject

to repeated, heavy trafficking

Arris repairs to joint edges

General structural repairs where formwork cannot

easily be erected.

Advantages

Structural patch repair

High tensile and flexural strengths

Anti-carbonation

Anti-chloride

Low water permeability

Standards Compliance

Renderoc S has been tested with appropriate sections of:

BS 1881, BS 5075, BS 4550, ASTM C67, BS 4551BS

6319

Description

Renderoc S is a pre-packaged, single component

structural repair material, which needs only the addition ofwater on site.

Renderoc S's low permeability property provides optimum

protection to steel reinforcement from chloride attack. The

Renderoc S formulation plus Nitobond AR primer ensure

intimate contact with parent concrete. Its shrinkage

compensated property enables it to be used for large and

small area applications.

Technical Support

Fosroc offers a comprehensive range of high performance

high quality, construction products. In addition to a wide

range of quality products, Fosroc offers a technical

support package to specifiers and contractors which

includes assistance with product selection and technical

advice from staff with unrivalled experience in the industry.

Properties

The following results were obtained at a water : powder

ratio of 0.11 and temperature of 200C.

Test Method Typical Result

Compressive Strength

(BS 4551)

>20 N/mm2at 1 day

>45 N/mm2at 7 days

>50 N/mm2at 28 days

Flexural Strength

(ASTM C348)

10 N/mm2a 28 days

Setting Time

(BS5075 at 270C)

Initial set 3.0 hr

Final set 4.25 hrs

Water absorption ISAT

(BS1881 Pt5: 1970)

10 mins: 0.005ml/m/sec

2 hrs:


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Renderoc S

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Specification Clauses

Steel reinforcement primer

The steel reinforcement primer shall be Nitoprime

Zincrich, a single component zinc-rich epoxy resin. The

primer shall be an "active" type, capable of avoiding the

generation of incipient anodes in immediately adjacent

locations. It shall be fully compatible with the Renderoc

system of concrete repair.

Bonding agent/primer for concrete

Concrete surface must be cleaned, free of loose particles,

etc. prior to application of Nitobond AR, an acrylic

emulsion bonding agent.

Nitobond AR is scrubbed onto the pre-wetted surface of

the concrete and it will dry in approximately one hour.

(depending on temperature and substrate porosity). For

detail application, please refer to a separate data sheet on

Nitobond AR

Repair mortar

The polymer modified reinstatement mortar shall be

Renderoc S, a single component cement-based blend of

powder to which only the site-addition of clean water shallbe permitted. The cured mortar shall achieve a

compressive strength of 50 N/mm2, a flexural strength of 9

N/mm2and a tensile strength of 3 N/mm

2at 28 days.

Application Instructions

Surface preparation

Successful repairs to concrete depend totally on correct

surface preparation. Particular care should be taken to

ensure all surfaces are completely free of laitance, oil,

dust, grease, plaster, paint, corrosion and any other

deleterious substances. Laitance should be mechanically

removed by high pressure water blasting, grit blasting or a

combination of both. Oil and grease deposits should be

removed by steam cleaning, detergent scrubbing or the

use of the proprietary degreaser such as Fosroc Chemical

Degreaser. Smooth surfaces should be mechanically

roughened by scabbling or needle gun to form a good

mechanical key. All reinforcing steel must be grit blasted

to a profile of SA 2 prior to the application of the

recommended primer. Edges of the areas for repair must

be saw cut to 5mm depth

Priming

All surfaces must be primed prior to repair. Reinforcing

steel must be primed with Nitoprime Zincrich an active

zinc/epoxy system which will prevent further corrosion. All

concrete surfaces should be thoroughly soaked but

leaving no surface water.

Concrete must be primed with Nitobond AR. Nitobond AR

is an acrylic emulsion which is scrubbed onto the surface

of the concrete. It will dry in approximately one hour

(depending on the temperature and substrate porosity).

Renderoc S should be applied when the Nitobond AR is

still tacky but may be applied up to 8 hours later. If the

Nitobond AR is too wet, build up may be reduced due to

slippage in vertical situations.

Mixing

Care should be taken to ensure that Renderoc S is

thoroughly mixed prior to use. Small quantities of

Renderoc S (up to 10 kg) may be hand mixed in a bucket.

It is essential that quantities of one bag or more are mixed

in a forced action pan mixer or with a slow speed drill (500

rpm) fitted with a spiral paddle (Polypan No. 707) are not

suitable. For normal applications 2.5 - 3.0 litres of watershould be added. This will yield approximately 12 litres of

Renderoc S.

Application

For application to all surfaces Fosroc recommended that

Renderoc S be applied with a wood float to ensure

positive contact with the primed substrate. Initial

application should be with tamping or compacting action

rather than a floating action. Finishing can be wood float,

steel trowel or sponge depending which type of finish is

required. The wood float will leave a surface suitable forthe application of Renderoc FC. Depending on the nature

and position of the repair it may be necessary to build up

Renderoc S in a number of layers.

The minimum layer thickness of Renderoc S is 5mm and it

can be built up to 20mm - 25mm on vertical surfaces. This

can be achieved either by the "wet-on-wet" technique

where each layer is fused to the previous one immediately


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Fosroc Sdn. Bhd.No 8 Jalan Trompet, 33/8

Seksyen 33, 40400 Shah AlamSelangor, Malaysia.

Branch Office:

29, Jalan Zainal Abidin,

10400 Penang, Malaysia.

www.fosroc.com Page 3

telephone:

+60 3 5191 5660

+60 4 2287 464

fax:

+60 3 5191 6960

+60 4 2292 661

email:

[email protected]

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 Services, copies of which may be obtained on request. Whilst Fosroc endeavours to ensure that any advice,

recommendation, specification of information it may give is accurate and correct, it cannot, because it has no direct or continuous control

over where or how its products are applied, accept any liability either directly or indirectly arising from the use of its products, whether or

not in accordance with any advice, specification, recommendation of information given by it.

MAL/0508/08/A

Renderoc S

or by allowing initial set to take place (3-4 hrs) and then

applying the next layer onto the previously scored and

primed surface. If sagging occurs at any time due to

excessive build up of Renderoc S, the material should be

completely removed and reapplied in thinner layers. Where

a high build is required in an overhead or vertical situation

the associated product Renderoc HB should be considered.

Curing

Renderoc S is a cementitous repair mortar. It is common

with all cementitous materials, Renderoc S must be cured

immediately after finishing in accordance with good

concrete practice. When overcoating with Nitocote

Dekguard the use of Nitobond AR sprayed onto the surface

as a continuous film is recommended. In harsh drying

condition supplementary curing such as wet hessian or

polythene must be used.

Cleaning

Renderoc S should be removed from tools with clean water

immediately after use. Cured material can only be removed

mechanically.

Overcoating

Renderoc FC (see separate data sheet) can be applied to a

repair area approximately 3-4 hours after application of

Renderoc S. Protective or decorative coatings can be

applied after 7 days.

Estimating

Supply

Renderoc S : 25 kg bags

Nitobond AR : 5 and 20 litre drums

Nitoprime Zincrich : 1 and 2.5 litre cans

Coverage and yield

Renderoc S : Approx 12 litres/25kg bag

Nitoprime AR : 6 to 8 m2/litre

Storage

Shelf life

All products have a shelf life of 12 months if kept in a dry

store in the original, unopened bags or packs.

Storage conditions

Store in dry conditions in the original, unopened bags or

packs. If stored at high temperatures and/or high humidity

conditions the shelf life may be reduced to 4 to 6 months.

Precautions

Health and safety

Renderoc S contains cement powders which, when mixed

or become damp, release alkalis which can be harmful to

the skin. During use, avoid inhalation of dust and contact

with skin and eyes. Wear suitable protective clothing,

gloves, eye protection and respiratory protective equipment.

The use of barrier creams provide additional skin protection.

In case of contact with skin, rinse with plenty of clean water,then cleanse with soap and water. In case of contact with

eyes, rinse immediately with plenty of clean water and seek

medical advice. If swallowed, seek medical attention

immediatelydo not induce vomiting.

Fire

Renderoc S is non-flammable

Additional Information

Renderoc S is part of a wide range of adhesives, repair

mortars, sealing compounds and protective coatingproducts specially designed and manufactured by Fosroc

for the construction industry.

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