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SikaScreed HardTop-70, Outdoor Quick Screed

SikaScreed HardTop-70, Outdoor Quick Screed

Screeds
SIKA

Sika is a global leader in specialty chemicals for the construction and industrial sectors. The company develops and supplies innovative products and systems for bonding, sealing, damping, reinforcing, and protecting structures. With a strong focus on sustainability and performance, Sika serves a wide range of applications including concrete production, waterproofing, roofing, flooring, and structural strengthening.

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General Specifications
Packaging 25 kg
Usage Rapid repair of small industrial floors incl. wet areas; screed base
Chemical Base Special cement based powder with hard aggregates
Usage Area -
Color Smooth, grey finish
Storage Conditions +5…+35 °C, dry, original packaging
Density -
Consumption ~2.1 kg/m 2 per mm
Application Thickness -
Ambient Air Temperature +10 °C min. / +30 °C max
Substrate Temperature +10 °C min. / +30 °C max
Waiting Time -

Cementitious, rapid hardening, high strength, floor levelling screed and repair mortar

SikaScreed® HardTop-70 is a cementitious, one-part, rapid hardening, high strength, floor levelling screed and repair mortar for industrial floors. The Product provides a low maintenance, high mechanical and abrasion resistant smooth screed, suitable as a finished surface or a base layer for resin based coating. Layer thickness 10 to 200 mm (7.87 in). Suitable for both internal and external use.

Usage
  • Rapid repair and levelling of small area industrial floors including wet areas.
  • Bonded, unbonded and floating screed wearing layer system.
  • Bonded, unbonded and floating screed base layer for resin top coats.
  • Rapid repair and levelling of external areas such as terraces, walkways, etc.
  • Where a deep section screed application is required.
Advantages
  • Pre-batched, one-part mortar that only needs the addition of water.
  • Low maintenance.
  • Easy to apply and lay as a monolithic flat floor finish, or on a slope.
  • Rapid hardening screed and repair mortar (≥45 N/mm² (6527 psi) at 24 hours).
  • Usability after only ~24 hours.
  • High mechanical and abrasion resistance.
  • Final, trafficable, screed wearing layer.
  • Screed suitable for underfloor heating (either water or electrical systems).
  • May be covered or overlaid with epoxy, polyurethane or hybrid flooring systems after only 18 hours.
  • Application of resin-based flooring primers / sealers within hours, not days.
  • Deep sections can be installed in a single layer, saving time and money.
Packaging

25 kg (55.1 lb) bags

Colour

Smooth, grey finish

Typical Product Data
ENVIRONMENTAL INFORMATION

- VOC emission classification GEV-Emicode EC1 PLUS , license number 4444/20.10.00.

APPROVALS / STANDARDS

- CE Marking and Declaration of Performance to EN 13813 - Resin screed material for internal use in buildings.
- CE Marking and Declaration of Performance to EN 1504-3 - Concrete repair product for structural repair.

Product Declaration

EN 13813: Class CT-C70-F8-A6.
EN 1504-3: Class R4.

Chemical Base

Special cement based powder with hard aggregates.

Shelf Life

12 months from date of production

Storage Conditions

Product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C (+41 °F) and +35 °C (+95 °F). Always refer to packaging.

Maximum Grain Size

D max : 3.2 mm (0.126 in)

Bulk Density

~1.50 kg/l (~12.5 lb/gal)

System Structure

Coated systems
Bonding Bridge SikaScreed®-20 EBB
Screed SikaScreed® HardTop-70
Finishing Aid Sikafloor®-140 W Trowelling Primer
Surface Primer Sikafloor®-151
Refer to Method Statement: Sikafloor® HardTop-60 / 70 Fast Screed Systems for further information.
SikaScreed® HardTop-70 is suitable for covering with Sikafloor® epoxy, polyurethane and hybrid systems.

Abrasion Resistance

Class Value Method
A6* ≤6 cm (2.36 in) 3 / 50 cm (19.7 in) 2 Böhme
AR 0.5* ≤50 µm BCA
* Performed on a power floated surface.

Compressive Strength

Time Temperature Value
24 hours +20 °C (+68 °F) ~45 N/mm 2 (~6527 psi)
28 days +20 °C (+68 °F) ≥70 N/mm 2 (10153 psi)

Flexural Strength

Time Temperature Value
24 hours +20 °C (+68 °F) ~6 N/mm 2 (~870 psi)
28 days +20 °C (+68 °F) ≥8 N/mm 2 (1160 psi)

Reaction to Fire

A1fl

Application
Fresh mortar density

~2.25 kg/l (~18.8 lb/gal)

Layer Thickness

10 to 200 mm (7.87 in)

Minimum thickness guidelines:

Bonded Screed and Repairs10 mm (0.394 in)
Unbonded Screed and Repairs40 mm (1.57 in)
Floating Screed40 mm (1.57 in) *

*Loading / use of the floor and the presence of underfloor heating will determine the thickness of the screed. Minimum thickness indicated is for unheated and lightly loaded floors. Also refer to the Sika Method Statement: “SikaScreed® HardTop Range”.

Product Temperature

+10 °C (+50 °F) minimum / +25 °C (+77 °F) maximum (fresh mortar)

Ambient Air Temperature

+10 °C (+50 °F) minimum / +30 °C (+86 °F) maximum

Mixing Ratio

~2.8 to 3.0 Litres of water for 25 kg (55.1 lb) of powder

Substrate Temperature

+10 °C (+50 °F) minimum / +30 °C (+86 °F) maximum

Pot Life

~25 minutes at +20 °C (+68 °F)

Waiting Time / Overcoating
SystemStart Finishing / Smoothing Apply Sikafloor ® -151 After Finishing
Rapid Coating Same Day~45 to 60 minutes ~2 to 3 hours
Coating Within 48 Hours~45 to 60 minutes <48 hours

Refer to the Method Statement: Sikafloor® HardTop-60 / 70 Fast Screed Systems and to individual Product Data Sheets for further information.

Times are approximate and measured at +20 °C (+68 °F) and >50 % r.h. Application times will be affected by changing substrate and ambient conditions, layer thickness and water content.

Applied Product Ready for Use

~18 hours (without coating or impregnation application). Time is approximate and measured at +20 °C (+68 °F) and >50 % r.h. Time will be affected by changing substrate and ambient conditions, layer thickness and water content.

Consumption

~2.1 kg/m 2 per mm. This figure is theoretical and does not allow for any additional material due to surface porosity, surface profile, variations in level or wastage, etc.

EQUIPMENT

SUBSTRATE PREPARATION

Abrasive blast cleaning or planing / scarifying equipment.

MIXING

Small to Medium Volumes

  • Mixing containers
  • Weighing scales
  • Water containers
  • Water measuring container
  • Double spiral mix paddle and drill (<500 rpm)
  • Forced action mixer or rotating pan, paddle or trough type. Freefall mixers must not be used

Large Volumes

  • Weighing scales
  • Water containers
  • Water measuring container
  • Forced action mixer or rotating pan, paddle or trough type. Freefall mixers must not be used

APPLICATION

  • Mixed material carriers / carts (wheelbarrows)
  • Spreading equipment
  • Height levelling equipment
  • Screed bar / straight edge
  • Screed rails

SURFACE FINISHING

  • Hand trowels
  • Walk behind power trowels (disc and blade types)
  • Finishing brooms

CURING

  • Polyethylene sheeting
MIXING

Small to Medium Volumes

  • Pour the minimum recommended clean water quantity in a suitable mixing container.
  • While stirring slowly with drill and mixing paddle, add the powder to the water and mix thoroughly for at least for 3 minutes, adding additional water if necessary to the maximum specified amount, and adjust to the required consistency to achieve a smooth consistent mix.
  • The consistency must be checked after every mix.

Large Volumes

  • Pour the minimum recommended clean water quantity into the forced action mixer or rotating pan.
  • Slowly, add the powder to the water and mix thoroughly for at least for 3 minutes, adding additional water if necessary to the maximum specified amount, and adjust to the required consistency to achieve a smooth consistent mix.
  • The consistency must be checked after every mix and compared to mixing by drill and mixing paddle technique.
APPLICATION

BONDED SCREEDS

Bonding Bridge

  • SikaScreed®-20 BB: To the prepared dry or matt damp substrate without any standing water, apply SikaScreed® HardTop-70 ‘wet-on-wet’ onto the SikaScreed®-20 BB within 30 minutes of mixing (+20 °C (+68 °F)). Also refer to SikaScreed®-20 BB Product Data Sheet.

Note: If SikaScreed®-20 EBB bonding bridge has dried, they must be removed mechanically and replaced before application of SikaScreed® HardTop-70.

APPLICATION

Bonded, Unbonded and Floating Screeds

  • Pour mixed SikaScreed® HardTop-70 onto a sufficiently prepared substrate and apply evenly to the required thickness using appropriate spreading equipment.
  • Level surface with screed bar / straight edge.

Surface Finishing

  • Finishing should be carried out to the required surface texture using suitable finishing tools.
  • To obtain optimum surface strength, finish SikaScreed® HardTop-70 with suitable equipment such as trowels or walk-behind power floats. Do not use heavy ride-on trowelling machines.
Start Finishing / Smoothing45 to 60 minutes after laying
Finishing TimeComparable to concrete
  • For high abrasion resistance values float the surface several times to achieve a very smooth finish using a disc power float.
  • Apply Sikafloor®-140 W Trowelling Primer during powerfloating if additional resin layers are required. Refer to the Method Statement: Sikafloor® HardTop-60 / 70 Fast Screed Systems.
  • Small areas which are difficult to access and where optimum surface strength is not required, use suitable hand trowels.

Curing

  • Curing must start after the last finishing operation using either coating within 48 hours, polyethylene sheeting, or for rapid same day coating, the use of a suitable system primer or impregnation. Refer to appropriate system data sheet for waiting times and further information.
  • For an uncoated system, use Sikagard®-914 W Stainprotect or Sikagard®-915 Stainprotect cure SikaScreed® HardTop-70 with polyethylene sheeting.
  • Curing with polyethylene sheeting must be maintained for at least 18 hours. At temperatures between +10 °C (+50 °F) and +15 °C (+59 °F) (substrate and air), the screed has to be cured with polyethylene sheeting for at least 24 hours.
CLEANING OF TOOLS

Clean all tools and application equipment with water immediately after use. Hardened / cured material can only be removed mechanically.