Green cements high in porosity and very low in thermal conductivity are developed.They are a low-carbon alternative to traditional insulation materials and mortars.A simplified GHG emissions estimation method has been proposed in the UK context.
One approach to decarbonising the cement and construction industry is to replace Portland cement systems with lower carbon alternatives that have suitable properties. We show that seven cementitious binders comprised of metakaolin, silica fume and nano-silica have improved thermal performance compared with Portland cement and we calculate the full CO2 emissions associated with manufacture and transport of each binder for the first time. Due to their high porosity, the thermal conductivity of these novel cements is 5890% lower than Portland cement, and we show that a thin layer (20mm), up to 80% thinner than standard insulating materials, is enough to bring energy emissions in domestic construction into line with the UK 2013 Building Regulations. Carbon emissions in domestic construction can be reduced by c. 2050% and these cementitious binders are able to be recycled, unlike traditional insulation materials.
[tabset tab1=Specifications tab2=Production Process] Basetrade Globals Portland cements come in five categories which are distinguished by their constituent materials and are deployed depending on the end-characteristics required by a construction project as described in the table below.
Cement binds materials together. It sets and hardens independently as an ingredient in the production of masonry mortar and of concrete, which is a combination of cement and an aggregate that forms a strong building material.
The materials used to make cement are primarily limestone, alluvium, chalk, shale and clay. Volcanic ashes and slag are also used in cement production depending on the end-product characteristics required.