Bricks & Pavers Technical Manual - Boral

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Bricks & Pavers Technical Manual Section 1.3. Brick Masonry Construction 1.317 Cleaning of Clay Masonry (continued) High Pressure Cleaning High-pressure water washing is now common for cleaning brickwork. If used the pressure must be kept below 1000 psi (7000 kPa), the nozzle must be kept 500 mm from the brick face and the nozzle must be a wide fan jet type with an angle of 15 degrees. The following practices must be observed: • Cleaning should not start until the mortar has hardened. • Hard lumps or persistent smears should be removed by hand. • Mask adjacent materials. • Do not apply the acid with the high-pressure sprayer. Use a low-pressure spray or broom it on. • Clean from top to bottom in small sections. • Work in the shade, ahead of the sun, if possible. • DO NOT USE EXCESSIVE PRESSURE OR GET TOO CLOSE, as this will damage the face of the brick and the mortar joint. Mortar joints that are no longer smooth with sharp edges is a clear sign of excessive pressure. Excessive pressure is used to make cleaning faster; it does not do a better job of cleaning. t ADV03799
Bricks & Pavers Technical Manual Section 1.3. Brick Masonry Construction 1.318 Cleaning of Clay Masonry (continued) Saturate the Wall Surface Failure to completely saturate the surface of the wall is in itself a major cause of cleaning stains. Cleaning solutions containing dissolved mortar particles and acids will be drawn into a dry masonry wall, causing staining. Furthermore, saturating the surface of the wall keeps the acid solution on the face of the masonry where the mortar smears are present. It is not true that face saturation weakens the acid and slows the cleaning. Water should be trained on the wall until the brick suction is exhausted. The area to be cleaned must be saturated as well as all brickwork areas below. If the wall appears to be drying on the surface, reapply water until ready to apply the cleaning solution. Recommended acid strengths are based on application to a surface saturated wall. Note: This point must be strictly adhered to for bricks manufactured in Queensland. Their raw materials contain large amounts of iron oxide and failure to saturate the surface of the wall allows acid solutions to react with the iron oxide and create severe iron oxide staining. Failure to saturate the surface of the bricks manufactured in other parts of Australia can also lead to the acid reacting with iron oxide but to a much lesser degree. This form of staining is known as acid burn and is particularly visible on light coloured bricks. Acid absorption into bricks can also lead to vanadium and manganese staining. t ADV03800
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1.1 Brick Properties
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1.2 Brick Masonry Design
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2.4 Clay Paver Property Tables
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5 Paver Range 5. Paver Range
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Projects In View PIV, Boral’s pub
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Free Clay Brick and Paver Samples F
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Bricks & Pavers Technical Manual - Boral

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