Concrete grout for masonry from Electronic Blueprint
Electronic Blueprint and ENVIROSPEC provide building specifications, details and training
on safe and sustainable buildings to architects, engineers and builders. Concrete grout must have sufficient
portland cement to provide an alkaline environment that protects the steel reinforcement. Limiting the size
of aggregate to 10 mm, insures against the formation of voids, while specifying a high slump ensures that the
grout can flow to all parts of the hollows.
AS 3700 requires grout to have strength of at least 12 MPa, but limits the design strength of grout to 1.3 times
the compressive strength of the concrete block. For a normal 15 MPa concrete block, this corresponds to 19.5 MPa.
Therefore there is little point in specifying strength in excess of 20 MPa. A suitable specification for concrete
grout, for use in masonry, is as follows:
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