Grand Housing Development Program Volume III - Gtz

MORTAR AND MASONRY WORK CONSIDERATIONSSection showing mortar spreadinginto holes of the HCBMortar should be used economically.Therefore it is put on the top of theprevious layer of HCBs in approx.2 cm height. It has to be spread tothe edges properly. A plain pieceof wood helps to prevent the mortarfrom falling down. The uppersurface of the mortar has to berather rough to get a proper connectionbetween the HCBs and toallow the mortar to spread into theholes of the upper HCB. It has topressed down until the height ofthe mortar is reduced to 1 cm.Walls constructed in this way canbe considered as load bearingwalls.Mortar qualityThe mortar used for walling up alltypes of HCBs has to be tested.The minimum pressure resistanceof the mortar mixture has to be 170Kg\sqcm or higher on the 7th day.Putting the mortar ontop of the last layerSpreading the mortarto the edge, using apiece of woodPlacing the HCB withthe closed bottom upFROM TECHNICAL MANUALS VOL I AND II MACHINERY, TOOLS AND BASIC TECHNIQUES15Addis AbabaCity Government