Understanding BS EN 771-3: Aggregate concrete masonry units

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Annex AGroupings of concrete units from EN 1996-1-1Volume of allholes (% ofthe grossvolume)Group 1(all materials)Limits for Masonry UnitsGroup 2 Group 3 Group 4HorizontalVertical HolesHoles< 25 > 25; < 60 > 25; < 70 > 25; < 50Volume ofany hole (%of the grossvolume)< 12,5Each ofmultiple holes 18 > 15 > 15 > 20 > 20Declaredvalue ofcombinedthickness (a)(b)of websand shells(% of theoverall width)NoRequirement> 18 > 15 > 45a) The combined thickness is the thickness of the webs and shells, measuredhorizontally across the unit at right angles to the face of the wall. The check is tobe seen as a qualification test and need only be repeated in the case of principalchanges to the design dimensions of units.b) In the case of conical holes, or cellular holes, use the mean of the thickness ofthe webs and the shells.6
Annex BCompressive strength of unitsTo BS 6073-1 To BS EN 771-32.82.93.53.65.05.27.07.310.010.4Preferred higher unit compressive strengthsBS 5628-1: 1992BS 5628-2: 2000152035BS 5628-1: 2005BS 5628-2: 2005(Not equivalent to 1992 &2000 strengths)17.522.530.040.0To order a copy of the full standards please visit: www.bsonline.bsi-global.com7
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Page 3 and 4: See Annex A for full details of the
Page 5: • Flexural bond strengthThis requ

Understanding BS EN 771-3: Aggregate concrete masonry units

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