Sandberg offers a comprehensive range of screed analysis encompassing both physical and chemical cement testing utilising BS and EN methods. Our experienced staff can undertake site investigations and sampling projects and back this up with laboratory testing carried out in our well equipped UKAS accredited Laboratories.
Screed analysis methods include:
Compaction of Screed
Irrespective of whether the screed is a simple sand cement mix or a proprietary mix, compaction is a big factor in performance. Experienced staff at Sandberg can undertake an examination of the screed to give an assessment of compaction, voidage, aggregate (and fibre reinforcement) distribution and the quality of mixing.
Screed Constituent Material Proportions
At Sandberg, our UKAS accredited laboratories can undertake chemical analysis to determine the mix composition and proportions of the screed sample. This can be anything from a simple sand cement screed to a more complex polymer screed levelling compound. We can identify the polymer constituent using Fourier Transform Infrared Spectroscopy (FTIR). Additionally, we can undertake analysis to determine the particle size distribution of the sand to check for compliance with specifications or British Standards.
Moisture Content of Screed
Screeds can take many months to dry out and it is extremely important to determine the moisture content of a screed accurately prior to the application of further floor finishes. Failure to determine that the screed has sufficiently dried prior to application of a damp proof membrane or a vinyl floor covering can lead to problems at a later stage. Sandberg can determine the moisture content of screed both on-site using various techniques and on samples removed from site and then the moisture determined in the laboratory.
Site Inspection and Testing of Screed
In-situ testing can also be undertaken to determine in situ crushing resistance, abrasion resistance, relative humidity and slip resistance. More information can be found on our Screed Testing page.
General Information about Screed
Screed is defined in British Standards as a layer of material laid in situ, directly onto a base slab, bonded or unbonded, or onto an intermediate layer or insulation layer, for one or more of the following purposes:
- To obtain a defined level
- To carry a final flooring
- To provide a wearing surface
Two terms are used in connection with this:
Levelling screed – This is used to form a flat level surface on which other flooring is laid
Wearing screed – This was known as ‘granolithic’ or ‘high strength concrete’ topping and serves as a flooring.
Screed historically comprised a site mixed blend of sand and cement but modern screeds may contain polymers and cement replacement materials to improve setting times or flow characteristics and may come pre-packed or ready mixed.
For more information contact our in-house expert: