Admixture for thin bonded, floating & unbonded screeds

Description

Ronafix admixture increases the physical properties of screeds and toppings, allowing Ronafix screeds to be laid thinner than conventional screeds.  Water permeability of Ronafix modified mortars is low or extremely low, depending on the mix design used, making Ronafix modified screeds highly resistant to frost damage.  Typical shrinkage of Ronafix Mix A screed is 0.01%, similar to that of epoxy resins.  Ronafix modified screeds are sufficiently dry for application of resin floorings and waterproof membranes, resilient floorings, carpet, quarry tiles, ceramic tiles and stone tiles after approximately 10 days of air curing when cured at 200C and approximately 60-65% relative humidity.  At 15mm thickness, Ronafix polymer modified screed will typically dry after 3 days air curing.

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DRYING OF SCREEDS

BS 8204-1 “Concrete bases and cementitious levelling screeds to receive floorings — Code of practice” section 6.11.1 suggests the following calculation for drying of screeds with no fast drying additi ...

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AVOIDANCE/ MITIGATION OF THE EFFECTS OF COMMON FORMS OF CRACKING IN CEMENTITIOUS SCREEDS

Aggregate is usually 0–4 mm and is mixed with cement in the ratio of 1:3 or 1:4 cement to sand, depending on strength requirements and drying requirements. For total screed thicknesses in excess of 50 ...

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Carbonation of Reinforced Concrete

Carbonation is the single most common cause of reinforcement corrosion in above ground structures and although many construction professionals and contractors are familiar with the progression of carb ...

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