MASONRY MORTARS FOR THIN JOINTS OF SILICATE ELEMENTS

FOUR CLASSES OF COMPRESSIVE STRENGTH
FOR INTERNAL AND EXTERNAL USE

USE

The mortar is available in four versions of different compressive strength : ATLAS SILMUR M-5 ≥ 5 N/mm2 ATLAS SILMUR M-7.5 ≥ 7.5 N/mm2 ATLAS SILMUR M-10 ≥ 10 N/mm2 ATLAS SILMUR M-15 ≥ 15 N/mm2 ATLAS SILMUR M-10 and M-15 are only available to order. Recommended for constructing walls of silicate elements (all versions), concrete and aerated concrete (SILMUR M-10, M-7.5 and M-5). Used as a thin joint masonry mortar – recommended joint thickness between 2 and 10 mm (optimum thickness: 2-3 mm). Used for surface trowelling and smoothing - with recommended coat thickness: 2-5 mm. Types of masonry elements – silicate, AAC and aerated concrete, as well as bricks, hollow bricks and other similar ceramic and concrete materials.

PROPERTIES

Available in two colour versions – each SILMUR material is available in white and grey colour. Easy and convenient to use – characterised by very good workability, plasticity and high adhesion. High coverage – the joint thickness can be monitored by using a notched trowel or a dispenser, which results in reduced mortar consumption and speeds up construction. It is possible to work at low temperatures, i.e. below +5°C, by adding antifreeze agents to the mortar, which allows a wider range of application temperatures, flexibility in mortar preparation (especially adjustment of the amount of water added); antifreeze guidelines of manufacturer should be followed as to the method of application and conditions of mortar setting; the amount of antifreeze addition depends on the cement content in mortar (the cement : filler ratio is 1:2 in ATLAS SILMUR M-10 and M-15, and 1:4 in SILMUR M-5 and M-7.5. Caution. The manufacturer of mortars is not responsible for the results of use and the quality of the antifreeze agents used.

SUBSTRATE PREPARATION

Preparation of silicate elements Wall construction. Clean the surfaces of elements to be joined of dust and any loose fragments. In order to achieve a thin joint of uniform thickness, it is recommended to sand and dust the surface of previously laid elements. Trowelling. The surface to be smoothed or trowelled should be dry, stable, flat and capable of load bearing, i.e. sufficiently sound, and cleaned of materials that might affect mortar adhesion, especially dust, dirt, lime, oil, grease, wax, residues of oil or emulsion paint. Substrates characterised by excessive absorption capacity should be primed with ATLAS UNI-GRUNT. Weather conditions Before commencing work it is necessary to give consideration to the conditions during construction work as well as the conditions during mortar setting and drying.

MORTAR PREPARATION

Add the material from the bag to a clean container with a pre-measured amount of water (proportions as specified in Technical Data) and mix using an electric drill with a mixer (or in a concrete mixer) until uniform consistency is obtained. Leave the mixed mortar to stand for 5 minutes and mix again. The mortar should be used up within ca. 4 hours.

APPLICATION

Wall construction The first layer of blocks is laid and levelled using ATLAS MASONRY MORTAR. Apply ATLAS SILMUR to the flat horizontal surface of the previously laid layer, to uniform thickness, using a notched trowel. Also apply the mortar to the horizontal contact surfaces of blocks, unless otherwise specified. Press each subsequent element firmly and tap into place using a rubber mallet. The information comprises basic instructions of product application and does not relieve users of responsibility for work in accordance with good construction practice and OHS regulations. Notes:Do not apply the mortar to excessively large surfaces in one go, because it retains its adhesive properties for ca. 10÷30 minutes (depending on the substrate properties and ambient conditions). To check if the blocks can still be joined, test the mortar by pressing your fingers to the layer. If the mortar sticks to the fingers, it is still possible to lay the next element. If the mortar does not stick, it is necessary to remove the old mortar and apply a new layer. • Adjust the amount of water added empirically, considering the desired mortar consistency, type of substrate and weather conditions. Using an incorrect amount of water for mixing results in reduced strength of the mortar.

CONSUMPTION

Wall construction Examples of material consumption rates for 20 cm high blocks, with a horizontal joint only: Thickness of homogenous wall 2 mm thick mortar layer 25 kg bag 12 cm ca. 2.0 kg/m² ca. 12.5 m² 18 cm ca. 3.0 kg/m² ca. 8.3 m² 24 cm ca. 4.0 kg/m² ca. 6.25 m² 30 cm ca. 5.0 kg/m² ca. 5.0 m² 36 cm ca. 6.0 kg/m² ca. 4.16 m² Trowelling The average consumption is ca. 1.6 kg for 1m2 for 1 mm joint thickness.

TOOLS

Drill with mixer, notched trowel (notch size 4÷8 mm), trowel, spatula. Wash the tools with clean water directly after use. Clean the remainder of the set mortar, that is difficult to remove, with ATLAS SZOP.

PACKAGING

Paper bags: 25 kg Pallet: 1050 kg in 25 kg bags

STORAGE & TRANSPORT

Store and transport in tightly closed bags, in dry conditions (pallets are particularly recommended). Keep dry. Shelf life in conditions complying with the requirements is 12 months from the date on the packaging. Soluble chromium(VI) content in the ready mix ≤ 0.0002 %.

TECHNICAL DATA

ATLAS SILMUR mortars are manufactured as a dry mix of cement binder, aggregate and modifiers. Dry bulk density (of dry mix): ca. 1.5 kg/dm3 Density (of mixed material): ca. 1.75 kg/dm3 Density of dry material (after setting): ca. 1.55 kg/dm3 Mixing proportions: 0.20 ÷ 0.24 l/1 kg, 5.00 ÷ 6.00 l/25 kg (water / dry mix) Minimum / maximum mortar layer thickness: 2 mm / 10 mm Mixing temperature and substrate and ambient temperature during the application: between +5°C to +30°C Pot life ca. 4 hours ■ Technical requirements The products meet the requirements of PN-EN 998-2. EC Declarations of Conformity: no. 090-1 for SILMUR M-10, no. 090-2 for SILMUR M-15, no 090-3 for SILMUR M-5 and no. 090-4 for SILMUR M-7.5. CE10 PN-EN 998-2 Design masonry mortars (SILMUR M-10 and M-15) and formulated masonry mortars (SILMUR M-5 and M-7.5), thin joint (T), for interior and exterior use, in elements subject to requirements as for structural elements, in reinforced and non-reinforced elements. Compressive strength - category: ≥ 5 N/mm2 – SILMUR M-5 ≥ 7.5 N/mm2 – SILMUR M-7.5 Class M10 – SILMUR M-10 Class M15 – SILMUR M-15 Initial shear strength (reference value): 0.30 N / mm2 Mortar composition (by weight) for SILMUR M-5 and SILMUR M-7.5: cement mortar 1:4 with modifiers Chloride content: 0.1% Cl Fire reaction class: A1 Water absorption: 0.05 kg / m2 min0.5 Water vapour permeability (reference value): μ 15 / 35 Thermal conductivity (tabular value): 0.83 W / mK (λ10, dry) Adjustment time: ≥ 10 min Aggregate grain size: ≤ 1.6 mm Durability: compressive strength following freeze/thaw cycles: ≥ 5 N/mm2 – SILMUR M-5 ≥ 7.5 N/mm2 – SILMUR M-7.5 Class M10 – SILMUR M-10 Class M15 – SILMUR M-15 Durability: weight loss following freeze/thaw cycles: ≤ 3% The products have been issued with Radiation Hygiene Certificates.

CAUTION

Irritant - contains cement. Irritating to respiratory system and skin. Risk of serious damage to eyes. May cause sensitisation by skin contact. Due to its form - powder, the product may cause mechanical irritation of eyes and respiratory system. Keep out of reach of children. Do not breathe dust. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Wear suitable protective clothing, gloves and eye/face protection. If swallowed, seek medical advice immediately and show the container or label. Follow the instructions in the Material Safety Data Sheet. The above information constitutes basic guidelines on product use and does not relieve users of the obligation to work in accordance with good practice and health and safety regulations. This technical data sheet supersedes all its previous versions. Revision date: 2010.12.15