Technical Datasheet ASO®-SEM Accelerated screed mortar with high strength
Material number
Contents
Unit of quantity
Packaging
Colour
206543001
25
KG
Bag
Cement grey
Product features Cementitious screed mortar CT-C40-F6-A9 in accordance with DIN EN 13813 Rapid setting Pot life of ca. 45 minutes Can be tiled with ceramic tiles after ca. 24 hours Foot traffic after ca. 14 hours Very low emission - EMICODE® EC 1PLUS
Advantages rapid construction progress Can be removed and smoothed particularly simply and effortlessly Sealed screed surface
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05/02/2024
Technical Datasheet ASO®-SEM Areas of application For producing rapid setting cement-based screeds For producing bonded screeds, separating layer screeds or as floating screed on an insulating layer Layer thicknesses from 10 till 80 mm depending on the construction method Heated and unheated design For interior and exterior use
Technical Data Material properties Base material Consistency Grain size max Bulk density of fresh mortar Heating, screed after Flexural strength (28 days, DIN EN 13813) Reaction to fire in accordance with Directive 96/603/EC Compressive strength (28 days, DIN EN 13813) Vapour diffusion behaviour
Pre-blended dry mortar Powdered < 4 mm approx. 2.1 kg/dm³ after 3 days ≥ 6 N/mm² A1fl approx. 40 N/mm² Vapour permeable
Mixing Mixing time Water addition
approx. 2 - 3 minutes from 1.5 l to 1.5 l
Application Substrate temperature Pot life Consumption pro m² and cm layer thickness Mixing method, machines, tools Foot traffic after Ready for covering with tiles Application temperature Overcoat after Hardening time / full resilience
from 5 °C to 25 °C approx. 45 minutes approx. 20 kg/m² Forced paddle mixer Free fall mixer approx. 14 hours approx. 24 hours from 5 °C to 25 °C approx. 24 hours approx. 7 days
Material consumption Minimum nominal thickness in accordance with DIN 18560
Application technology Machine application ASO®-SEM can be mechanically applied. For precise information, see the additional Technical Information No. 43.
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Technical Datasheet ASO®-SEM Suitable covering Tiles Boards Textile covering Parquet PVC
Substrate preparation Measures for substrate preparation 1. The substrate must correspond to the payloads associated with the load-bearing capacities in accordance with DIN EN1991-1-1. 2. In areas with water impact class W0-I to W3-I in accordance with DIN 18534 and the ZDB data sheet [*1], screed produced with ASO®-SEM pre-blended dry mortar is applicable for use if a suitable SCHOMBURG bonded waterproof system has been applied.
Substrate moisture content
Preparing the surface With a water addition of 1.5 litres to 25 kg ASO-SEM, an ambient and substrate temperature of +23 °C, a relative humidity of 50% and a layer thickness of 5 cm, the screed is ready for laying with tiles after one day.
Usage Application 1. With bonded screeds, first brush ASOCRET-HB-FLEX into the prepared, e.g. abraded concrete substrate. 2. Apply the screed to the wet slurry coat. The relevant guidelines for cement-based screeds according to DIN18560 and DIN 18353 apply for processing. 3. The dimensions of surfaces must be such that the application can be completed within this pot life. 4. Higher temperatures shorten the pot life. Lower temperatures increase the application and hardening times. 5. Mixing, application, and processing must be completed in immediate sequence.
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Technical Datasheet ASO®-SEM Mixing recommendations for mixing and conveying machines 1. In conventional mixing and conveying machines with a 220 l mixing vessel, e.g. the EstrichBoy from Brinkmann, PFT, Putzmeister Mixokret, or similar, a total 250kg of ASO®-SEM is mixed with 15 l of tap water. This equates to a mixing vessel level of approx. 80% - as recommended by the machine manufacturers in general. 2. Half-fill the mixing drum with 125 kg ASO®-SEM and approx. 10 l water. 3. Then top up the remaining 125 kg ASO®-SEM and add 5 l water. 4. The total mixing time is ca. 2 - 3 minutes. 5. Establish a consistency of damp earth to stiff plastic through water addition. 6. Protect the fresh screed to prevent it drying out too rapidly, e.g. due to heat or draughts. 7. Tiles are ready for laying after one day if the following prerequisites are met: * water addition of 1.5 litres to 25 kg ASO®-SEM*, ambient and substrate temperature of +23 °C*, relative humidity of 50% * layer thickness of 5 cm 8. A moisture measurement must be carried out using the CM method to check the moisture content.
Cleaning tools Rinse tools with water immediately after use.
Storage conditions Storage Store in a cool and dry place. Min. 12 months in the original canister. Promptly use opened canister.
Disposal Product leftovers can be disposed of in accordance with disposal code AVV 17 01 01.
Notes All values given in the TM apply at +23°C and 50% relative humidity. Observe the technical data sheets of the products mentioned before starting work. ASO®-SEM can crystalline bind approx. 6% of its weight to water. Water quantities that exceed this volume must evaporate and therefore delay the readiness to receive tiles and boards! If moisture rises from the substrate, effective waterproofing is essential prior to laying the screed! The installation location must be ventilated. However, draughts and direct solar radiation should be avoided during application and the hardening process. The indoor temperature and floor temperature must be at least +5 °C during application, and during the following week! Air dehumidifiers may not be used during the first 3 days! A moisture measurement must be carried out using the CM method to assess whether it is ready to receive. Do not add any other cement or binder! Low temperatures, high humidity and heavy layer thicknesses delay hardening, drying and extend the time until ready to receive tiles. (Also see the BEB data sheet "Building climate preconditions for drying screeds"). Tests showed that the crystalline binding of the mixing water is slower at low temperatures (+5 to +10 °C), meaning that the screed was only ready to receive tiles after a longer period of time! Water that is pressed out of the surface of the screed indicates excessive water addition (more than 1.5 l water/25 kg ASO®-SEM)! If the selected mixing time is too short or mixing is not sufficiently intense, this is not guaranteed to disperse all constituents sufficiently. The screed will not be ready to receive tiles and boards quickly, and it will no longer exhibit a high strength! Border, field, structural movement joints and movement joints should be carried over to or installed at the designated location; suitable means, e.g. edge strips, should be used to detach them! Crack control joints should be cut in up to a third of the introduced layer thickness!
Relevant regulations Planning, inspection of substrates and building site circumstances, laying, grouting and subsequent care of the work must be done in accordance with the relevant DIN standards and recognised rules of technology (e.g. the ZDB sheets of the Zentralverband Deutsches Baugewerbe e.V.) in the latest version. GISCODE: ZP1
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Technical Datasheet ASO®-SEM Annotations Conformity / Declaration / Verification
Impact classes and typical applications in accordance with DIN 18534-1
Impact classes for container in accordance with DIN 18535
The rights of the buyer with regard to the quality of our materials are based on our terms and conditions of sale and delivery. Our technical advice team will be happy to advise you in the case of requirements that exceed the scope of the application described here. In order to be binding, a legally binding written confirmation is required. The product description does not release the user from a duty of care. Lay a test area in the event of uncertainty. This version becomes invalid in the event of a new version being issued.
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