Latest CBA Newsletter - Concrete Block Association

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selling our product Reasons to be cheerful Part L - concrete blocks Set out below is a checklist of reasons for promoting concrete blocks as an ideal building material. I would ask all members to convey these consistent selling points to specifiers, architects, builders, developers and merchants. Even if the order is not won on that occasion, it could benefit another member and maybe you the next time around. Tried and tested building method In use for over 100 years with almost no reported failures A masonry constructed home will last 150 years plus. Consider this against an NHBC 60 year guarantee based on concerns on timber life Allows huge flexibility in design Forgiving of structural alterations Available off the shelf Stocked by 4000 builders merchants for next day delivery Industry standard sizes, strengths and densities Thermal and acoustic characteristics well documented Made in the UK 90 plants operated by 30 competing companies. Two thirds of blocks are delivered less than 50 miles. Local production of this high bulk, low value material makes sense and provides year round quality manufacturing employment Meets 2010 Part L Regs Inherent thermal mass repays embodied carbon within 11 years High recycled content Lightweight blocks regularly contain 70% plus recycled furnace bottom ash (by product of coal fired power generation) Dense blocks typically contain 10% of fly ash (by product of coal fired power generation) crushed glass and china clay waste also used Unsaleable by-product crushed rock fines are a major dense block raw material All block waste from manufacturing is re-used Easy to recycle as C & D material at end of life Completely fireproof Timber frame structures are particularly susceptible to fires during construction and have caught light as a result of later plumbing and electrical repairs Flood resistant Flood damage if far more serious in timber framed buildings compared to masonry Capable of meeting all levels in Code for Sustainable Homes Compliant with all Social Housing Requirements Low embodied carbon According to an NHBC foundation Nov 2011 report there is no significant difference masonry vs timber frame Technical information available on the CBA website Comprehensive set of technical data sheets on applications, Part L 2010 guide, U-value calculator and Accredited Construction Details on thermal bridging all available at http:// www.cba-blocks.org.uk/ No registration necessary. 18 wall fabric designs giving U values from 0.20 to 0.28 W/m 2 K listed in the CBA guide “Aggregate Block Solutions” 10 approved designs for separating wall thermal by pass also shown. U value of 0.00 W/m 2 K can be used in SAP 2009 Ideal background for dry lining, wet finishes and fixings ‘93% of people would prefer to live in a masonry home.’ (Oct 2009 ICM poll) 8 www.cba-blocks.org.uk
aw materials Carbon negative lightweight aggregates The 30,000 tonne per year processing facility at Brandon, Suffolk. Carbon Negative Aggregate Carbon8 Aggregates have pioneered production of the world’s first carbon negative aggregate using Accelerated Carbonation Technology. The company is currently operating a 30,000 tonne per year facility at Brandon in Suffolk, and is in the process of establishing both a second and third site in the UK. The patented manufacturing process permanently captures carbon dioxide as the medium for treating and binding materials to form a pelletised aggregate product known as C8Agg. Accelerated Carbonation Technology Accelerated Carbonation Technology was developed at the University of Greenwich for the treatment of industrial wastes and contaminated soils. Many thermal wastes exhibit a natural reaction with carbon dioxide, resulting in the formation of artificial limestone (carbonate). Under controlled conditions, this natural process can be significantly accelerated and used to cement neighbouring grains together to form a dense hardened mass. This process has the effect of chemically stabilising and physically encapsulating any contaminants in the waste. Carbon Footprint Natural aggregate, of which there is an increasing shortage particularly in the South-East, has a carbon footprint of approximately 1.73kg CO 2 /tonne at the quarry gate. Recycled or secondary aggregate is slightly higher at 1.91kg CO 2 /tonne. Transport of the aggregate adds considerably to the footprint, so that finding a local aggregate supply is one of the principal aims of reducing the embodied carbon of construction projects. The use of accelerated carbonation in the manufacture of a secondary aggregate, where carbon dioxide is permanently captured in the aggregate, results in a carbon footprint which is substantially negative (up to –44kgCO 2 /tonne). Properties of C8Agg Oven dried Kg/m 3 Water absorption % C8Agg is commercially competitive to locally sourced natural aggregate. It has a density of less than 1200kg/m 3 and is therefore classified as a lightweight and tested to BS EN 13055 accordingly. C8Agg has been approved as a product by the Environment Agency through their Modernising Waste Panel ‘End of Waste’ process. In a written statement, the panel highlighted that C8Agg blocks “…show no worse detriment to the environment Mean crushing resistance MPa than blocks manufactured with virgin aggregate”. The aggregate is currently being used by one of the UK’s largest independent block manufacturer, Lignacite Ltd, in the manufacture of dense and medium dense concrete blocks. It can also be used in lean-mix concrete, precast, and other bound applications. When C8Agg is used as a natural aggregate replacement in Lignacite’s blocks, the blocks perform as well as those without the Carbon8 aggregate in BS EN 771-3 tests. The blocks can also be demonstrated to be carbon negative, ranging from –5 to –14 kg/tonne depending upon the proportion used. Giles De Lotbiniere, Owner of Lignacite says; “We have evolved our original Lignacite mix to include C8Agg material which, without any structural compromise, produces a sustainable and genuinely carbon negative block”. www.c8s.co.uk Water soluble chloride % Acid soluble sulfate % C8Agg 1020 18.4 >11.05 5.3 0.24 Lytag 750 27.1 6.5 0.1 0.4 Leca 350 30 1.1
Page 1 and 2: CBA supporting the concrete block i
Page 3 and 4: Raising The Bar and concrete block
Page 5 and 6: statistics GB Deliveries - CBA Stat
Page 7: modern masonry alliance The fight o
Page 11 and 12: TECHNICAL REPORT 10. The performanc
Page 13 and 14: thermal mass Thermal mass in concre
Page 15 and 16: environment & sustainability and bi

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