Cement, Lime, water thickener or sand for mortar - Electronic Blueprint
Electronic Blueprint and ENVIROSPEC provide building specifications, details and
training on safe and sustainable buildings to architects, engineers and builders. Cement and
lime used in the masonry mortar should comply with the relevant standards, as per AS 3700 Masonry
structures.
- Cement shall be Type GP portland cement or GB blended cement complying with AS 3972.
- Masonry cement shall comply with AS 1316.
- Lime shall be hydrated building lime complying with AS 1672.1.
In some applications, as a substitute for lime, it is recommended that methyl-cellulose water
thickener be used. This is a gel that holds the moisture in the mortar until it has time to
hydrate and harden. Methyl cellulose water thickener is quite different from air-entraining
agent, which is commonly used to increase mortar workability. The over-dosing of air-entraining
agent is often detrimental to the quality of the mortar.
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