SikaScreed®-40 Binder

Low-shrinkage ternary binder for screeds with temperature-independent setting time

SikaScreed®-40 Binder is a ternary binder for the preparation of low-shrinkage screeds with high strength. The formulation enables a temperature-independent setting time of the screed. Strengths of class CT-C40-F7 according to DIN EN 13813 can already be achieved with a binder to sand mixing ratio of 1:5.

  • Screed quality CT-C40-F7 already possible with a mixing ratio of 1:5 (DIN EN 13813)
  • Setting time independent of temperature
  • Long troweling time window
  • High early strength
  • Can be used in many applications
  • Frost resistant
  • Insensitive to moisture (permanently wet area)
  • Long pump feed possible
  • Temperature resistant from -30 °C to +80 °C
Product Data Sheet Show all documents

Overview

Usage

  • Large-scale refurbishment of industrial screeds exposed to high mechanical loads
  • High-quality screeds on an isolating layer or
  • insulating layer (also heated screeds) in commercial and industrial construction for all common floor coverings
  • Indoors and outdoors, can also be used directly
  • Permanently wet areas
  • Can also be used in residential construction
 

Advantages

  • Screed quality CT-C40-F7 already possible with a mixing ratio of 1:5 (DIN EN 13813)
  • Setting time independent of temperature
  • Long troweling time window
  • High early strength
  • Can be used in many applications
  • Frost resistant
  • Insensitive to moisture (permanently wet area)
  • Long pump feed possible
  • Temperature resistant from -30 °C to +80 °C

Packaging

20 kg bag and 1,000 kg BigBag

Product Details

CERTIFICATES AND TEST REPORTS

EMICODE EC1PLUS (very low emisson)

Composition

Grey powder

Shelf life

8 months from production date 

Storage conditions

Store in closed and undamaged original packaging at temperatures between +5 °C and +30 °C in a dry condition.

Bulk density

~1.1 kg/litre

 

System structure

Bonding agent

Screed

SikaScreed®-40 BB

SikaScreed®-40 Binder

Compressive strength

Mixing ratio

(Binder : Sand)

Compressive stiffness

after 3 days

Compressive stiffness

after 28 days

Ratio 1:4

4 bags (80 kg)

≥ 35 N/mm²≥ 60 N/mm²

Ratio 1:5

3 bags (60 kg)

≥ 25 N/mm²≥ 40 N/mm²

Ratio 1:6

2,5 bags (50 kg)

≥ 15 N/mm²≥ 35 N/mm²

Screed sand of grain size 0 to 8 mm (grading curve A/B) according to DIN 1045.

Ambient temperature and material temperature of +23 °C and relative humidity 50 %.

The above specifications correspond to a full mixing drum with a usable volume of 200 liters (filling capacity 100 %).

Flexural-strength

Mixing ratio

(Binder : Sand)

Bending tensile strength

after 3 days

Bending tensile strength

after 28 days

Ratio 1:4

4 bags (80 kg)

≥ 5 N/mm²≥ 7 N/mm²

Ratio 1:5

3 bags (60 kg)

≥ 4 N/mm²≥ 7 N/mm²

Ratio 1:6

2,5 bags (50 kg)

≥ 3 N/mm²≥ 5 N/mm²

Screed sand of grain size 0 to 8 mm (grading curve A/B) according to DIN 1045.

Ambient temperature and material temperature of +23 °C and relative humidity 50 %.

The above specifications correspond to a full mixing drum with a usable volume of 200 liters (filling capacity 100 %).

Shrinkage

Shrinkage class SW1

(DIN 18560-1)

Application

Layer thickness

min. 10 mm / max. 160 mm

Depending on the maximum grain size of the screed sand.

Material temperature

min. +5 °C / max. +25 °C

Ambient air temperature

min. +5 °C / max. +25 °C

Substrate temperature

min. +5 °C / max. +25 °C

Pot Life

~ 60 minutes

Screed sand of grain size 0 to 8 mm (grading curve A/B) according to DIN 1045.

Ambient temperature and material temperature of +23 °C and relative humidity 50 %.

Waiting time

Walkable

~4 hours

Ready for covering with vapor-tight and moisture-sensitive coverings/coatings

3 days

Screed sand of grain size 0 to 8 mm (grading curve A/B) according to DIN 1045.

Ambient temperature and material temperature of +23 °C and relative humidity 50 %.

Consumption

Mixing ratio

Consumption of binder

Ratio 1:4

4 bags (80 kg)

~ 4 kg/m² per cm thickness

Ratio 1:5

3 bags (60 kg)

~ 3,4 kg/m² per cm thickness

Ratio 1:6

2,5 bags (50 kg)

~ 2,9 kg/m² per cm thickness

The above specifications correspond to a full mixing drum with a usable volume of 200 liters (filling capacity 100 %).

SUBSTRATE PREPARATION

Bonded screed

The substrate must be clean, free of grease and oil and free of loose fine particles. Cement skin, paints or other surface treatment agents must be completely removed.The substrate must be load-bearing and have a sufficient compressive strength of ≥ 25 N/mm² and a minimum adhesive tensile strength of 1.5 N/mm².A prerequisite for a good bond is suitable substrate preparation using grinding, blasting or milling techniques and the use of the appropriate system bonding bridge SikaScreed®-40 BB.Absorbent mineral substrates must be pre-wetted with sufficient water. Standing water (puddles) should be avoided. 

 

MIXING

Prepare the aggregate mixture in a compulsory mixer according to the mixing instructions below.

Add SikaScreed®-40 Binder and mix for 1 minute. With the mixer running, add water depending on the moisture content of the aggregate mixture used and mix for approx. 2 minutes. Avoid adding too much water!

         

Mixing ratio of binder to sand ratio 1:4

Mixing instructions for a conventional screed mixing pump (usable volume approx. 200 liters of fresh mortar):

Half fill the mixing drum with aggregate (approx. 160 kg of a low-fine particle grading curve in the A/B range; maximum grain size matched to the layer thickness). Then add 4 bags (= 80 kg) of SikaScreed®-40 Binder (corresponds to 400 kg SikaScreed®-40 Binder per m3 of fresh mortar). Fill the mixing drum with a further 160 kg of aggregate and adjust the consistency by adding water.

 

Mixing ratio of binder to sand ratio 1:5

Mixing instructions for a conventional screed mixing pump (usable volume approx. 200 liters of fresh mortar): 

Half fill the mixing drum with aggregate (approx. 150 kg of a low-fine particle grading curve in the A/B range; maximum grain size matched to the layer thickness). Then add 3 bags (= 60 kg) of SikaScreed®-40 Binder (340 kg SikaScreed®-40 Binder per m3 of fresh mortar). Fill the mixing drum with a further 150 kg of aggregate and adjust the consistency by adding water.

 

Mixing ratio of binder to sand ratio 1:6

Mixing instructions for a conventional screed mixing pump (usable volume approx. 200 liters of fresh mortar): 

Half fill the mixing drum with aggregate (approx. 150 kg of a low-fine particle grading curve in the A/B range; maximum grain size matched to the layer thickness). Then add 2.5 bags (= 50 kg) of SikaScreed®-40 Binder (290 kg SikaScreed®-40 Binder per m3 of fresh mortar). Fill the mixing drum with a further 150 kg of aggregate and adjust the consistency by adding water.

 

APPLICATION

When producing a bonded screed, the pre-treated surface must be pre-wetted and pre-slurried with SikaScreed®-40 BB system bonding bridge and immediately applied fresh on fresh with SikaScreed®-40 Binder screed mortar. 

Spread the screed with a shovel, smoothing trowel or squeegee, compact, level with a level and rub down with a wooden board. Machine smoothing is required to achieve high surface strengths (e.g. for direct use or as a substrate for coatings).

Protect freshly applied screed against premature drying out. Keep windows closed indoors. Avoid direct sunlight.

If SikaScreed®-40 Binder is installed as a heated screed, the heating protocol must be observed.

DIN 18560 and DIN 18353 must be observed during application.

CLEANING OF EQUIPMENT

All tools and equipment must be cleaned with water immediately after use. Cured material can only be removed mechanically.

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