Cement-based self-levelling mortar is a dry-mix mortar composed of special cement, aggregates, and multiple additives. When mixed with water, it forms a highly fluid slurry that rapidly self-levels under manual spreading assistance. Unlike water, which can flow over considerable distances, this material maintains a defined flowability (approximately 130 millimetres) and direction (flowing only from high to low points) within a specific timeframe (approximately 3-5 minutes, depending on ambient temperature). Beyond this period, flow ceases and setting commences.
Self-levelling cement/mortar primarily comprises high-alumina cement, ordinary Portland cement, and a-hemihydrate gypsum, accounting for 30–40% of the material.
Mineral fillers primarily utilise quartz sand and calcium carbonate powder, accounting for 55–68%. These components enhance the material’s hardness and stability. Setting regulators adjust the material’s setting time; common examples include retarders such as tartaric acid and coagulant accelerators such as lithium carbonate.
Rheology modifiers improve the material’s workability, with components such as superplasticisers or water-reducing agents enhancing stability. Reinforcing components include redispersible polymer powders, which improve the material’s flowability, abrasion resistance, and strength.
SIDLEYchem is a specialist additive manufacturer and supplier, offering expert product application guidance.
For self-levelling mortars, we recommend multiple products:
Superplasticizer
Defoamers
Water-retention suspending agents
Retarding agents
Polymer
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