SCREED-SX is a fiber-reinforced, fast-setting mortar that replaces cement (the binding material) in floor screeds. It consists from special fast-setting cements and additives. When mixed with sand and water, the cement mortar produced offers the following advantages:
- Fast hardening and high early strength
- Long workability time
- Fast walkability (after approx 6h*)
- Moisture content is reduced fast
- Higher mechanical strength than a screed with normal setting cement
- It can be covered with tiles shortly after application, even after 24 h depending on its thickness
- It can also be used as a floating screed
- It can be pumped for faster application
- Ideal where fast return-to-service is required.
Substrate
The substrate must be free of loose materials, dust, grease, etc., prior to application of the new screed. For application thickness up to 50 mm to absorbent cementitious substrates, it is recommended to apply first a bonding layer using ADIPLAST polymer latex so as to ensure excellent adhesion to the substrate. SCREED-SX is applied while the bonding layer is still fresh (fresh on fresh). Mixing ratio of ADIPLAST bonding layer: Cement: Sand: ADIPLAST: Water = 1 : 1 : 0,5 : 0,5 by volume. For application thickness larger than 50 mm to absorbent cementitious substrates, it is recommended to properly saturate the substrate with water prior to installation of the new screed. Very absorbent substrates should be primed with the acrylic primer UNI-PRIMER. The application of the screed follows after the primer has dried.
Application
1 bag of 20 kg of SCREED -SX is mixed with 80-100 kg of sand and approximately 12 l of water.
Mixing in a screed pump:
Generally, due to the unknown moisture content of the sand, which will affect the workability of the screed, it is recommended to add first half the quantity of sand, then the water, and finally SCREED-SX. After mixing for about 2 min until a uniform mass is formed, add gradually more sand until the desired workability is obtained and mix for at least 2 more min. Depending on the moisture content of the sand, more water may be required in order to prepare a screed with semi-dry or plastic consistency.
Mixing with a low-speed mixer:
For mixing small quantities, a low-speed mixer can be used, following the abovemixing instructions and a steady mixing ratio by weight: SCREED-SX: Sand: Water = 1 : 4-5 : 0.6.
After pouring the screed on the floor, the laying procedure is the same as for concrete.
