PART B - MORTAR BOND
The overlapping arrangement of the concrete block or bricks in the wall is called a mortar bond. A bond
is achieved when the mortar hardens and knits them together. The strength of the mortar bond is
affected by the-
Type and quality of the cementing material
Surface texture of the mortar-bedding area.
Water retention of the mortar.
Quality of the workmanship.
1-9. Sand. Clean, sharp sand produces excellent mortar. Too much sand causes the mortar to
segregate. You can make mortar that is easily workable by properly grading the sand and thoroughly
mixing the other aggregates.
1-10. Water Retentivity. Loss of moisture due to poor water retention results in the rapid loss of
plasticity and may seriously reduce the strength of the bond. To ensure the strength of the bond-
Keep concrete blocks dry until they are built into the wall.
Do not wet concrete blocks/bricks to control suction before application of mortar.
Use lime where weather conditions are hot and dry. Lime slows down the evaporation of
moisture in mortar, since it retains water.