On many Australian building sites, clay rich sands, fire clays, air entraining agents, sweeteners and banned substances are mixed with mortar to make it more workable, often without the knowledge or consent of project superintendents and owners.
Inferior practises can lead to poor quality buildings, low mortar bond strength, efflorescence and other problems in brick and block work.
Australian Standards, AS3700-2011 Mortar Mix Table 11.1 and AS4773.2-2015 Table 3.2 clearly prescribe ingredients and proportions for mortar mixes; Clean Water, Washed Sand, Cement, Lime and/ or cellulose based water thickener for optimum mortar workability.
Don’t turn a blind eye ensure mortar mixes meet Australian Standards and industry best practice.
METCELL™cellulose based water thickeneravailable at leading hardware stores or online order and fast delivery at www.metcell.com.au
Think Brick Australia - Technical Manual 10 - provides guidance for the construction of clay masonry in buildings. Page 14 of the Manual refers to the problem of using Fire Clay as a mortar workability additive and states; "As the dose of clay increases, the bond strength reduces markedly (see Figure 3). Hence, the use of fire clay is not permitted as a mortar additive under Clause 188.8.131.52 of AS 3700-2011"
A video of highlights of the 10th Annual Australian Masonry Conference. Metcell® was pleased to be associated with the conference as a sponsor. Our product was well received by the many attendees at the conference held in Sydney, Australia on the 11-14 February 2018. Visit www.amc.com.
Metcell is a brand new product on the market. Its a cellulose based water thickener that solves the problem of making a mortar mix that is easy to work with, compliant with the Australian Standards and increases bond strength and durability.