Abstract: A composite structure comprising a plurality of support members (11) arranged to form a decking member within a slab (15) said support members (11) comprising a pair of flange members (13, 14) joined by connecting a connecting web member (12), at least one flange member (11) having a lip portion.A support member (11) comprising a pair of flange members (13, 14) joined by a connecting web member (12), at least one flange member having a lip portion, said lip portion comprising a ridge member and depending stepped portion.

Abstract: In a bank of sleeper moulds wherein the moulds lie side by side and contain shoulder receiving apertures which locate shoulders during pouring, the improvements including a rocker shaft journalled for rotation with respect to the moulds and having retaining members thereon which retain the shoulders and urge them into engagement with locating means.

Abstract: A mixer having a rotary drum which comprises a flexible member, an inner rotor with outstanding blades thereon, the flexible member, the inner rotor, and its blades all being of elastomeric material, the inner diameter of the flexible member being greater than the envelope diameter of the rotor blades, the mixer rotor being positionable within the flexible member with which its blades co-operate in the mixing of concrete, but being withdrawable therefrom for cleaning and maintenance purposes.

Abstract: A concrete mixer in this invention comprises an elastomeric lug belt carried by a first set of roller drums at least one of which is driven, the lug belt having a plurality of spaced elastomeric lugs thereon, and an elastomeric base belt carried by a second set of roller drums and depending between two of these roller drums to form a part-loop portion, at least one of the base belt roller drums also being driven to drive the lug belt past the base belt in a mixing zone in the part-loop portion, such that the base belt moves in the opposite direction from the direction of movement of the lug belt.

Abstract: An uncured cementitious substrate may be coated by a method which comprises applying to the substrate an aqueous emulsion of a film-forming polymeric material, wherein the emulsion contains at least one soluble soap.