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absorption acid attack bitumen bricks brickwork British Standard Specification Building Research Station calcite calcium carbonate calcium sulphate carbonate cent chemical clay clinker coarse aggregate colour concrete consists contain copper corrosion covered by British cracks creosote crushing strength cubic foot damp-proof course density diameter durability efflorescence finishing coat glazed Grade grain granite gypsum hardwood heat hydrated hydraulic limes igneous rocks iron kiln knots laths lead less limestone linseed oil lithopone magnesium marble material metal mixture moisture content mould occurs oolitic oxide paint pigment pipes polish Portland cement pozzolanas preservative produced proportion purposes quarried quicklime resistance rocks roofing salts sample sand sandstone sapwood seasoning sheet shrinkage sieve silica slag slaked slates softwood soluble solution Specific gravity square foot square inch stain steel stone suitable surface temperature texture thickness tiles timber tons per square under-coat varnish veneers walls weight width wood workability zinc