土木工程英语证书(PEC)考试-建筑专业术语定义Aggregate-Pebbles,shingle,graveletc.usedinthemanufactureofconcrete,andotherconstructionwork.Airbrick-Aperforatedbrickusedforventilation,especiallyforunderfloorspaces.Asbestos-Afibrousmineralusedinthepastforinsulation.Canbeahealthhazard-shouldnotbedisturbedandspecialistadvicesoughtiffoundorsuspected.Asbestoscement-Cementwith10-15%asbestosfibreusedasreinforcement,oftenusedinthepastforroofingsheets,gutter,rooftiles.Itisfragileandwillnotbearheavyweights.Hazardousfibresmaybereleasedifcut,drilledorotherwisebroken.Asphalt-Black,tar-likematerial,stronglyadhesiveandimpervioustomoisture.Usedonflatroofsandundertilefelt.Balancedflue-Acommonfluedesignusedwithgasapplianceswhichallowsairtobedrawntotheappliancewhilstalsoallowingfumestoescape.Bat(brickwork)-Abrickcutcrosswaystogiveareducedlength-commonlyquarter,halforthree-quarterbats.SeealsoCloser.BeamandBlock(Floor)-Suspendedfloorsconsistingofprecastprestressedconcretebeamsspacedatcentrestosuittheuseofstandardwallingblocksasinfillbetweenthebeams.Theyareapreferredsolutionforsuspendedgroundfloorsinhousing.Bitumen-Ablack,stickysubstance,relatedtoasphalt.Usedinsealants,mineralfeltsanddamp-proofcourses.Brace-Adiagonalmemberusedtopreventpartofastructurefromsagging-caneitherbetemporaryorpermanent.Breezeblock-Anoldtypeofbuildingblockmadeusingcinders-tendstoproducefindblackdustwhendrilledorcut.Brickbond-Thevariousstylesoflayingbrickstogivedifferentpatternswhileensuringthatnoverticaljointsalignwiththoseofthehigherorlowerrow.Cantilever-Aprojectingbeam(orotherpartofastructure)thatissecuredatoneendonly.Caulking-Sealingjointsbyapplyingaflexiblecompoundorsealant.Cavitywall-Amethodofbuildingexternalwallsofhousesusingtwoleavesofbrickorblockwork(withwall-tiesbetween)separatedbyagap(I.e.the'cavity')ofabout50mm(2inches).Thepreventsrainetcontheexternalleaffrompenetratingintothebuilding.Cavitywallinsulation-Amethodofimprovingthethermalinsulationofawallbyfillingthewallcavitieswithoneofvariousmaterialsavailabletop