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Construction chemicals company SBD has developed a new dry spray concrete designed to comply with all clauses of the Department of Transport's specifications for structural repair concrete.The new product is a prebagged polymer modified cement-based mix called Mulsifix Spray Concrete DS. It is claimed to be the first of its type to contain only limestone aggregates.Because there is no sand in the mix, the risk of alkali-silica reaction is removed. Having only limestone aggregate means the material is more durable than existing products and is more stable if exposed to fire, says SBD.Chemicals which promote cohesion give the material a low 'rebound factor', says SBD - in other words, when it hits the wall, it stays there. It can be projected by most dry spray processing machines.Mulsifix Spray Concrete DS has a high density and low permeability which, combined with a short hardening time, makes it suitable for use on highways and marine structures.SBD, 0525 718877. CONSTRUCTION NEWS