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Hydromedia is an ideal solution for surface and storm water management. Typically containing 20-35% void space, it allows water to pass directly through it at a permeability of 150 - 1000 L/min/m²

Where to use Residential roads carparks (max load 7.5T) and parking lots

Pavements, bike & pedestrian pathways

Patios

Tennis courts

Swimming pool decks

Alleyways

Driveways

Pavement edge drains and gutters.

Advantages of HydromediaIn common with standard Pervious:1. Available with integral colour

2. Can form part of a cost-effective Sustainable Urban Drainage System (SUDS)

3. Eliminates need for detention ponds

4. Offers space saving for more efficient land development

5. Mitigates surface pollutants

Advantages outperforming standard Pervious:1. Robust wearing surface

2. Faster draining

3. Smooth clean look

4. Ease of placement

5. Easy placement with a paver

Technical features1. Unit weight is up to 70% less than conventional concrete

2. Workable for up to 90 minutes

3. Compressive strength of 10–20N/mm2

4. Flexural strength of 1.5–3N/mm2

5. Excellent permeability at a rate of:

Hydromedia is more fluid/flowable (higher slump approx 190 – 200mm) or class S4

Improves the in-place homogeneity of the product

Performance Quality Innovation

Mpa

Mpa

Hydromedia is an ideal solution for surface and stormwater management. Typically containing 20-35% voidspace, it allows water to pass directly through it at apermeability of 150 - 1000 l/min/m2

Where to use• Residentialroadscarparks(maxload7.5T)andparkinglots• Pavements,bike&pedestrianpathways• Patios• Tenniscourts• Swimmingpooldecks• Alleyways• Driveways• Pavementedgedrainsandgutters.

Advantages of HydromediaIn common with standard Pervious:

1. Availablewithintegralcolour2. Canformpartofacost-effectiveSustainableUrbanDrainageSystem

(SUDS)3. Eliminatesneedforretentionponds4. Offersspacesavingformoreefficientlanddevelopment5. Mitigatescontaminationofgroundwaterbysurfacepollutants

Advantages outperforming standard Pervious:1. Robustwearingsurface2. Fasterdraining3. Smoothcleanlook4. Easeofplacement5. Easyplacementwithapaver

Technical features1. Unitweightisupto70%lessthanconventionalconcrete2. Workableforupto90minutes3. Compressivestrengthof10–20Mpa4. Flexuralstrengthof1.5–3Mpa5. Excellentpermeabilityatarateof150-1000l/min/m2

Safety featuresReduces glare from wet pavements

Eliminates water accumulation from heavy rain

Important recommendationsThe standard rules for good concrete practice and placing must be strictly observed with proper curing procedures as required by normal concrete mixes but more rapidly implemented.

Safety precautionsThe use of safety goggles, hard hat, ear defenders and gloves is recommended when placing concrete.

First AidEyes: Immediately flush eyes, including under lids, with water for

at least 15 minutes to remove all particles. If necessary, seek medical advice

Skin: Wash skin with cold water and a pH neutral soap assoon as possible, except where open wounds are visible. Attention should be paid to wounds and fresh scars which should be covered with protective paraffin gauze. Seek medical help in cases of prolonged contact with wet concrete.

Ingestion: Rinse mouth with clean water. If swallowing has occurreddrink plenty of milk or water. Do not induce vomiting. Seek medical attention immediately.

Inhalation: Move to fresh air. If symptoms persist seek medical attention.

Design:There are two factors that determine pavement system design thickness:

Hydraulic properties such as permeability (related to yearly average rain fall) and volume voids (related to water storage)

Structural properties such as tensile strength offering better load bearing properties

Selection of appropriate Hydromedia properties is dependent on the more dominant between:

Hydrological requirements

Load bearing requirements

The larger of these values governs design thickness.

Subgrade & Subbase preparation Consult geotechnical engineer

Uniform (level) subgrade support

Larger of two values governs design thickness

Compact subgrade to 90 – 95% of theoretical density

Increasing compaction decreases permeability

Stable subbase required, crushed aggregates recommended

Placement Higher fluidity promotes ease of placement

Rapid drying requires specialist handling and curing

Concrete transfer can be done by either off the truck or using concrete conveyer. Pumping is not recommended.

Placement Concrete retention is 90 minutes

Test consistency using Hydromedia testing procedure when possible. If not visually inspect consistency.

Placement should be continuous and rapid

Can be paver laid. Recommended Pavers are available upon request

Reduce over working the concrete, especially after striking off and finishing.

Use recommended placement method.

Striking off Conventional forms to be used

Vibrating screeds or standard screeds and roller compacters can be used for strike off

Riser strips are not recommended due to minimal compaction that occurs with Hydromedia

Do not over vibrate or work the top surface

Compaction and finishing Compact with steel roller compactors or vibrating plates or pavers to height

of forms

Hand tamp near edges and other places not reached

Complete compaction within 15 minutes of placement

No floating or trowelling

Minimize over working or movement of the surface after compaction. This includes walking on the surface.

Jointing Contact your local technical representative for further information

It is recommended to place joints immediately after compaction. Otherwise saw cuts are possible after 7 days of curing.

Curing & Protection Fog mist the surface within 20 minutes of compaction

Cover with thin plastic sheeting within 20 minutes after placement and leave in place for 7 days

Some curing compounds may also be used

Maintenance Minimal maintenance required

Design site to minimise flow of soil and leaves to pavement

Vacuum annually or when clogging test indicates the necessity, alternatively try pressure washing

To discuss your specialised mix and further requirements.

Call now - 0870 336 8294

Lafarge Aggregates & Concrete UKGranite House, PO Box 7388

Watermead Business Park, SystonLeicester, LE7 1WA

www.lafarge.co.uk

Lafarge Aggregates Limited registered in England and Wales 297905

Disclaimer - The information contained inthis leaflet is based upon knowledge andexperience of the materials used in themanufacture of the products. However, sincethe application of the products is carried outby the customer and is beyond the controlof Lafarge Aggregates Limited, Lafarge doesnot accept any liability or responsibilitywhatsoever for any loss, damage or injuryresulting from the use or application of theproducts outside the scope of the intendeduse and precautions set out in this leaflet andany accompanying data sheets.

Lafarge Industries South Africa (Pty) Ltd35 Westfield Road, Longmeadow Business Estate

Ext 11, Edenvale, 1609Tel: 0860 LAFARG/0860 523 274

0861 LAFARG/0861 523 274Fax: 086 631 000

Cape Town: (021) 508 8000Durban: (031) 275 7400

www.lafarge.co.za

0860 523 274

Safety featuresReducesglarefromwetpavementsEliminateswateraccumulationfromheavyrain

Important recommendationsThestandardrulesforgoodconcretepracticeandplacingmustbestrictlyobservedwithpropercuringproceduresasrequiredbynormalconcretemixesbutmorerapidlyimplemented.

Safety precautionsTheuseofsafetygoggles,hardhat,eardefendersandglovesisrecommendedwhenplacingconcrete.

First AidEyes: Immediatelyflusheyes,includingunderlids,with waterforatleast15minutestoremoveallparticles. Ifnecessary,seekmedicaladviceSkin: WashskinwithcoldwaterandapHneutralsoapas soonaspossible,exceptwhereopenwoundsarevisible. Attentionshouldbepaidtowoundsandfreshscarswhich shouldbecoveredwithprotectiveparaffingauze.Seek medicalhelpincasesofprolongedcontactwithwet concrete.Ingestion: Rinsemouthwithcleanwater.Ifswallowinghasoccurred drinkplentyofmilkorwater.Donotinducevomiting. Seekmedicalattentionimmediately.Inhalation: Movetofreshair.Ifsymptomspersistseekmedicalattention.

Design:Therearetwofactorsthatdeterminepavementsystemdesignthickness:

• Hydraulicpropertiessuchaspermeability(relatedtoyearlyaveragerainfall)andvolumevoids(relatedtowaterstorage)

• Structuralpropertiessuchastensilestrengthofferingbetterloadbearingproperties

• SelectionofappropriateHydromediapropertiesisdependentonthemoredominantbetween:

- Hydrologicalrequirements- Loadbearingrequirements

Thelargerofthesevaluesgovernsdesignthickness.

Subgrade and Subbase preparation• Consultgeotechnicalengineer• Uniform(level)subgradesupport• Largeroftwovaluesgovernsdesignthickness• Compactsubgradeto90–95%oftheoreticaldensity• Increasingcompactiondecreasespermeability• Stablesubbaserequired,crushedaggregatesrecommended

Placement• Higherfluiditypromoteseaseofplacement• Rapiddryingrequiresspecialisthandlingandcuring• Concretetransfercanbedonebyeitheroffthetruckorusingconcrete

conveyer.Pumpingisnotrecommended.• Concreteworkabilityis90minutes• TestconsistencyusingHydromediatestingprocedurewhenpossible.

Ifnotvisuallyinspectconsistency.• Placementshouldbecontinuousandrapid• Canbepaverlaid.Recommendedpaversareavailableuponrequest• Reduceoverworkingtheconcrete,especiallyafterstrikingoffand

finishing.• Userecommendedplacementmethod.

Striking off• Conventionalformstobeused• Vibratingscreedsorstandardscreedsandrollercompacterscanbe

used• forstrikeoff• Riserstripsarenotrecommendedduetominimal• compactionthatoccurswithHydromedia• Donotovervibrateorworkthetopsurface

Compaction and finishing• Compactwithsteelrollercompactorsorvibratingplatesorpaversto

heightofforms• Handtampnearedgesandotherplacesnotreached• Completecompactionwithin15minutesofplacement• Nofloatingortrowelling• Minimize over working or movement of the surface after compaction

This includes walking on the surface.

Jointing• Contactyourlocaltechnicalrepresentativeforfurtherinformation• Itisrecommendedtoplacejointsimmediatelyaftercompaction

Otherwisesawcutsarepossibleafter7daysofcuring.

Curing and Protection• Fogmistthesurfacewithin20minutesofcompaction• Coverwiththinplasticsheetingwithin20minutesafterplacement

andleaveinplacefor7days• Somecuringcompoundsmayalsobeused

Maintenance• Minimalmaintenancerequired• Designsitetominimiseflowofsoilandleavestopavement• Vacuumannuallyorwhencloggingtestindicatesthenecessity,• alternativelytrypressurewashing