Cassidy Brothers offering concrete blocks with Ecocem GGBS
This article was originally published in issue 37 of Passive House Plus magazine. Want immediate access to all back issues and exclusive extra content? Click here to subscribe for as little as €10, or click here to receive the next issue free of charge
GGBS (ground granulated blastfurnace slag) is a lower carbon alternative to traditional Portland cement, and is derived from steel industry by-products.
Speaking to Passive House Plus, David Cassidy of Cassidy Brothers said that as well as its lower carbon footprint, another advantage of incorporating GGBS is that it increases the strength of its blocks by up to three Newtons.
Cassidy Brothers also integrates GGBS into its precast concrete products for public realm works, including seating, benches, and planters. The company’s experience in this area includes public realm works at high profile locations such as Canary Wharf in London, and Capital Dock and North Wall Quay in Dublin.
David Cassidy explained that there is a high demand for GGBS-rich concrete for such projects because it delivers a lighter and more attractive colour, while being more a"ordable than white concrete. He said the company generally incorporates more than 50 per cent — and even up to 70 per cent — GGBS into the precast concrete for such projects. Cassidy explained that another advantage of using GGBS is that it eliminates problems with efflorescence in concrete, which is a discolouration caused by the deposition of salts when water evaporates.
Passive House Plus previously reported on how Galway based Coshla Quarries has changed its blockwork recipe to integrate 50 per cent GGBS as standard.
“Ecocem have seen a sharp increase in demand by specifiers, for products containing high proportions of GGBS,” said Andy Christian, commercial manager with Ecocem Ireland. “Right now, the move towards sustainable solutions is being driven by architects, engineers and contractors that are determined to make a difference.
“There is a clear opportunity for companies to be leaders in this area and establish themselves and their products as the sustainable option. Ecocem already supply GGBS to over a dozen block producers nationwide. This number will only increase as the demand for low carbon products increases.”
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