AS 4773.2:2015 pdf download.Masonry in small buildings Part 2: Construction.
3.1 MORTAR TYPES
Mortar types shall be as specified in the documents but their durability shall be not less than the requirements given in Table 3.1 and Table 3.2. The mix proportions shall comply with the following:
(a) Mortar mixes shall be designated by the materials and proportions of their ingredients. They shall be set out in the order of parts of cement : lime : sand. NOTE: These proportions are sometimes preceded by the letter that abbreviates the material. For example, Cl : LO.5 : S4.5 is one part cement: haifa part lime: four and a half parts sand.
(b) The water thickener referred to in Table 3.2 is methylcellulose based. I’he particular methylcellulose-based product used shall he specifically suited for this application. NOTES: 1 The methylcellulose-based product should be used in accordance with the manufacturer’s or supplier’s instructions. 2 Air-entraining agent is not the same as methylcellu lose-based water thickener. 3 Volumes in Table 3.2 refer to those materials in the dense-packed condition. (c) Type SR cement shall be used in masonry below the damp-proof course in areas with sulphate-rich ground water.
NOTES:
I All external elements in contact with freshwater or subject to non-saline wetting and drying shall be treated as for a marine environment. For example, this applies to gardens against a house.
2 All external elements in contact with saline or contaminated water, or subject to saline wetting and drying, shall be treated as for a severe marine environment.
3 Requirements for especially aggressive environments depend on the nature of the corrosive agents and cannot he defined. Units, mortars, covers or coatings, shown by test or know by experience to be resistant to the particular corrosive agent, shall he used.
4 M2 mortar is not permitted for concrete and calcium silicate masonry. There are also limitations on the constituents of M3 and M4 mortars for calcium silicate masonry (see Table 3.2.).
3.2 MORTAR COMPONENTS
3.2.1 Cement
Cements shall comply with AS 3972 for Type UP or GB or AS 1316 for masonry cement.
3.2.2 Lime
Dry hydrated lime shall comply with AS 1672.1.
3.2.3 Sand
Sand shall be free from material harmful to the mortar, grout, masonry units, reinforcement or any embedded items. Sand shall be well graded and, when tested in accordance with the appropriate method of the AS 1141 series, shall contain not more than 10% of material passing the 75 micron sieve.
3.2.4 Vater thickener
Water thickener shall be methylcellulose-based water thickener specifically designed and packaged for use in masonry.
3.2.5 Water
Water shall be free from any matter harmful to the mortar, grout, masonry units, reinforcement or any embedded items. NOTE: Potable (drinkable) water is satisfactory.
3.2.6 Additives
The following additives are acceptable for use in mortar:
(a) Plasticizers or workability agents specifically designed for use in masonry and air-entraining agents complying with AS 1478.2. NOTE: Overdosing mortar with workability agents reduces the durability and bond strength.
(b) Colouring pigments complying with EN 12878.Fire clay shall not be used unless the sand is sharp and requires more workability. If fire clay is added to mortar, the proposed mix shall be tested in accordance with the requirements of AS 3700 for flexural strength and shall achieve a tiexural strength not less than 0.2 MPa.Detergent, sugar, beer, sweetened beverage and plaster of Paris are harmful to bond strength and shall not be used in mortar.
5.3 WALL TIES
Wall ties shall be used to connect the outer leaf of a masonry vall to its supporting inner leaf or frame. Wall ties shall be of Type A complying with AS/NZS 2699. 1, and shall be selected and spaced in accordance with Clauses 9.7 and 10.6. NOTE: Type A ties are not suitable for high earthquake applications. Type B ties are commonly used in New Zealand and are generally not available in Australia.
5.4 LINTELS
Lintels shall be steel, reinforced concrete, prestressed concrete, prestressed clay or other proprietary systems. Steel lintels shall comply with the durability requirements of AS/NZS 2699.3.
Lintel selection shall be in accordance with Section 8.
5.5 REINFORCEMENT
Steel reinforcement shall comply with AS/NZS 4671 and be detailed in accordance with the relevant requirements of AS 3600.
5.6 FLASH INGS AND DAMP-PROOF COURSES
Flashings and damp-proof courses shall comply with Table 5.2. When Ilashings are expected to hold a particular shape, a rigid flashing material shall be used. To avoid galvanic corrosion, metal Ilashings shall be compatible with other metals with which they are in contact or spill water onto, or from which they receive water. Lead flashings shall not be used on any roof that is part of a potable water catchment roof.AS 4773.2 pdf download.