Ronacrete Technical Articles


SCREED MIX DESIGNS 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 mm, the use of 0–8 mm aggregate should be considered, or a fine concrete screed, since these ... Read more

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 carbonation through concrete and the consequential effects on reinforcement, some may not be familiar with research carried out in recent years.  This research suggests that loss of reinforcement ... Read more

Polymer Modified Levelling and Wearing Screeds

Polymer modified screeds are typically specified when thin high performance screeds are required.  Wear resistant polymer modified screeds, as described in BS 8204 Part 3: Polymer modified cementitious levelling screeds and wearing screeds — Code of practice, are ideal for heavy duty industrial floors and polymer modified levelling screeds can be applied fully bonded to ... Read more

Polymer Modification of Cementitious Mortars

Compressive strength of unmodified concrete and mortars can continue to increase slowly after the initial curing period. However, other physical properties are reduced as the concrete or mortar ages.  Published independent data relating to the effect of ageing on cementitious mortars is scarce. But testing of compressive strength, tensile strength and elastic modulus has been …

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Resin Bound Surfacing, the Choice is Clear

There are two types of polyurethane resin used for resin bound surfacing, one is UV stable (aliphatic polyurethane) which remain unchanged by exposure to ultra-violet light and the other, (aromatic polyurethane) will yellow and darken after exposure to UV light, thus altering the appearance of the aggregate.

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Working below 5oC with Ronacrete Products

When daytime temperatures fall below 5 degrees C, works involving concrete and mortars for renders, concrete repair and screeds are affected. Hardening of concrete and mortars takes longer and strength gain is much slower, leaving recently applied materials prone to frost damage. Mortars applied in layers, such as concrete repairs and renders…

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The Choice – Resin Bound Surfacing or Resin Bonded Surfacing

Resin Bound Surfacing and Resin Bonded Surfacing are often confused. Here we discuss the difference between these two decorative surfacing systems.

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A Guide to Application of Concrete Repair Products and Coatings to Reinforced Concrete Structures

Adequate adhesion of concrete repair materials and coatings can only be achieved when correct substrate preparation has been carried out.  Inadequate preparation will lead to early or eventual failure of adhesion of mortars and coatings.  The mode of failure in mortars is typically a breakdown of cohesion in the substrate at or close to the …

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Understanding Preparation of Concrete

Adequate adhesion of screeds, renders, concrete repairs and floor coatings/ membranes can only be achieved when correct substrate preparation has been carried out.  Finishing of concrete and screeds by trowelling, powerfloating or tamping will leave a layer of laitance (a relatively weak layer of hydrated cement) on the surface which must be removed; adhesion to …

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Sustainable Drainage Systems (SuDS) and Resin Bound Surfacing

Sustainable drainage systems (SuDS) are a natural approach to managing drainage in and around properties and other developments. Sustainable drainage systems work by slowing water run off from a site, allowing natural processes to break down pollutants.  Water draining through SuDS compliant paving may be allowed to flow naturally to groundwater or diverted to a …

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