Bricks & Pavers Technical Manual - Boral

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Bricks & Pavers Technical Manual Section 1.3. Brick Masonry Construction 1.301 The following information relates to the construction of brick walls to meet AS3700, the design and aesthetic requirements. Mortar AS3700: 2001, Table 10.1 gives the options for mortar mixes classified as M1 to M4. M1 mortars are for restoration applications. M2 mortars are for use in interior walls above dampcourse or in exterior walls above dampcourse if more than one km from a body of salt water and 10 km from a surf coast and the wall has protection from water ingress above. M3 and M4 mortars are those most commonly used in construction. Table 11 gives the proportions of the most commonly used mortars. Other deemed-to-satisfy compositions are given in AS3700. Special mortars that are tested and shown to meet requirements are allowed with verification on site. Note: Proportions are by volume and should be measured with a bucket or gauge box, NOT A SHOVEL. Table 11. Typical Mortar Mixes Mix proportions by volume Mortar Durability Type Class Portland or Hydrated Water Blended Cement Lime Sand Thickener* M1 PRO 0 1 3 No M2 PRO 1 2 9 No M3 GP 1 1 6 No M3 GP 1 0 5 Yes M4 EXP 1 1 ⁄2 4 1 ⁄2 No M4 EXP 1 0 4 Yes Refer to page 1.104 for description of Durability Class. *Methylcellulose type, not air entrainers such as detergent. Where masonry strength is crucial, trial walls should be constructed with the bricks and mortar to be used on the job, then tested before construction commences. Masonry bond strength is related to the suction of the bricks, the particle size distribution of the sand, cement content, additive contents, etc. For many jobs these panels can also be used as physical samples of the required quality of the bricklaying and cleaning. Note: AS 3700 allows the use of: • Cements complying with AS 3972 or AS 1316 • Lime complying with AS 1672.1 • Sand that is free of any deleterious materials • Water that is free from deleterious materials and • Admixtures including plasticisers, air entraining agents and set retarders complying with AS1478.1, cellulose-type water thickeners, colouring pigments complying with BS EN 12878 and bonding polymers. t ADV03783
Bricks & Pavers Technical Manual Section 1.3. Brick Masonry Construction 1.302 Mortar (continued) No other material may be used until tests on masonry constructed with the mortar, made with the material or admixture shows the masonry complies with the standard’s requirements for compressive strength, flexural strength and durability. Deleterious materials are those reducing the strength or durability of the masonry and including anything that attacks the built-in components. This means the use of fire clay, detergent, sugar, soft drink, etc., are banned. Most of these materials severely reduce mortar strength and durability. Water thickener must be used only according to the manufacturer’s directions because overuse severely reduces mortar strength. Mortar Estimator Table 12. Estimated Material Requirements to Lay 1,000 Standard Bricks Mix Composition 40 kg bags 25 kg bags Cubic metres Tonnes of (C:L:S) of cement of lime of sand damp sand M3 1 : 1 : 6 4 2.4 0.64 1.2 M3 1 : 0 : 5 4 0 0.64 1.2 M4 1 : 0 : 4 6.5 0 0.64 1.2 M4 1 : 1 ⁄2 : 4 1 ⁄2 5.3 1.6 0.64 1.2 This table assumes partial filling of cores and typical site wastage. Only make sufficient mortar for immediate use. If mortar starts to set, it may be re-tempered once only. Where bricklaying is interrupted, the mortar should be covered to prevent evaporation and mixed with the trowel before continuing. t ADV03784
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Projects In View PIV, Boral’s pub
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Bricks & Pavers Technical Manual - Boral

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